Merge branch 'master' into nymkappa/scan-closed-channel-no-mempool

backend/mempool-config.sample.json

@@ -43,7 +43,9 @@
     "TLS_ENABLED": true
   },
   "ESPLORA": {
-    "REST_API_URL": "http://127.0.0.1:3000"
+    "REST_API_URL": "http://127.0.0.1:3000",
+    "UNIX_SOCKET_PATH": "/tmp/esplora-bitcoin-mainnet",
+    "RETRY_UNIX_SOCKET_AFTER": 30000
   },
   "SECOND_CORE_RPC": {
     "HOST": "127.0.0.1",
@@ -59,7 +61,8 @@
     "SOCKET": "/var/run/mysql/mysql.sock",
     "DATABASE": "mempool",
     "USERNAME": "mempool",
-    "PASSWORD": "mempool"
+    "PASSWORD": "mempool",
+    "TIMEOUT": 180000
   },
   "SYSLOG": {
     "ENABLED": true,

backend/package.json

@@ -34,35 +34,35 @@
     "prettier": "./node_modules/.bin/prettier --write \"src/**/*.{js,ts}\""
   },
   "dependencies": {
-    "@babel/core": "^7.20.12",
+    "@babel/core": "^7.21.3",
     "@mempool/electrum-client": "1.1.9",
-    "@types/node": "^16.18.11",
+    "@types/node": "^18.15.3",
     "axios": "~0.27.2",
     "bitcoinjs-lib": "~6.1.0",
     "crypto-js": "~4.1.1",
     "express": "~4.18.2",
     "maxmind": "~4.3.8",
-    "mysql2": "~2.3.3",
+    "mysql2": "~3.2.0",
     "node-worker-threads-pool": "~1.5.1",
     "socks-proxy-agent": "~7.0.0",
     "typescript": "~4.7.4",
-    "ws": "~8.11.0"
+    "ws": "~8.13.0"
   },
   "devDependencies": {
-    "@babel/core": "^7.20.7",
+    "@babel/core": "^7.21.3",
     "@babel/code-frame": "^7.18.6",
     "@types/compression": "^1.7.2",
     "@types/crypto-js": "^4.1.1",
     "@types/express": "^4.17.15",
-    "@types/jest": "^29.2.5",
+    "@types/jest": "^29.5.0",
     "@types/ws": "~8.5.4",
-    "@typescript-eslint/eslint-plugin": "^5.48.1",
+    "@typescript-eslint/eslint-plugin": "^5.55.0",
-    "@typescript-eslint/parser": "^5.48.1",
+    "@typescript-eslint/parser": "^5.55.0",
-    "eslint": "^8.31.0",
+    "eslint": "^8.36.0",
-    "eslint-config-prettier": "^8.5.0",
+    "eslint-config-prettier": "^8.7.0",
-    "jest": "^29.3.1",
+    "jest": "^29.5.0",
-    "prettier": "^2.8.2",
+    "prettier": "^2.8.4",
-    "ts-jest": "^29.0.3",
+    "ts-jest": "^29.0.5",
     "ts-node": "^10.9.1"
   }
 }

backend/src/__fixtures__/mempool-config.template.json

@@ -44,7 +44,9 @@
     "TLS_ENABLED": true
   },
   "ESPLORA": {
-    "REST_API_URL": "__ESPLORA_REST_API_URL__"
+    "REST_API_URL": "__ESPLORA_REST_API_URL__",
+    "UNIX_SOCKET_PATH": "__ESPLORA_UNIX_SOCKET_PATH__",
+    "RETRY_UNIX_SOCKET_AFTER": "__ESPLORA_RETRY_UNIX_SOCKET_AFTER__"
   },
   "SECOND_CORE_RPC": {
     "HOST": "__SECOND_CORE_RPC_HOST__",
@@ -60,7 +62,8 @@
     "PORT": 18,
     "DATABASE": "__DATABASE_DATABASE__",
     "USERNAME": "__DATABASE_USERNAME__",
-    "PASSWORD": "__DATABASE_PASSWORD__"
+    "PASSWORD": "__DATABASE_PASSWORD__",
+    "TIMEOUT": "__DATABASE_TIMEOUT__"
   },
   "SYSLOG": {
     "ENABLED": false,

backend/src/__tests__/config.test.ts

@@ -47,7 +47,7 @@ describe('Mempool Backend Config', () => {
 
       expect(config.ELECTRUM).toStrictEqual({ HOST: '127.0.0.1', PORT: 3306, TLS_ENABLED: true });
 
-      expect(config.ESPLORA).toStrictEqual({ REST_API_URL: 'http://127.0.0.1:3000' });
+      expect(config.ESPLORA).toStrictEqual({ REST_API_URL: 'http://127.0.0.1:3000', UNIX_SOCKET_PATH: null, RETRY_UNIX_SOCKET_AFTER: 30000 });
 
       expect(config.CORE_RPC).toStrictEqual({
         HOST: '127.0.0.1',
@@ -72,7 +72,8 @@ describe('Mempool Backend Config', () => {
         PORT: 3306,
         DATABASE: 'mempool',
         USERNAME: 'mempool',
-        PASSWORD: 'mempool'
+        PASSWORD: 'mempool',
+        TIMEOUT: 180000,
       });
 
       expect(config.SYSLOG).toStrictEqual({

backend/src/api/audit.ts

@@ -93,17 +93,7 @@ class Audit {
       } else {
         if (!isDisplaced[tx.txid]) {
           added.push(tx.txid);
-        } else {
         }
-        let blockIndex = -1;
-        let index = -1;
-        projectedBlocks.forEach((block, bi) => {
-          const i = block.transactionIds.indexOf(tx.txid);
-          if (i >= 0) {
-            blockIndex = bi;
-            index = i;
-          }
-        });
         overflowWeight += tx.weight;
       }
       totalWeight += tx.weight;

backend/src/api/bitcoin/bitcoin.routes.ts

@@ -32,8 +32,10 @@ class BitcoinRoutes {
       .get(config.MEMPOOL.API_URL_PREFIX + 'backend-info', this.getBackendInfo)
       .get(config.MEMPOOL.API_URL_PREFIX + 'init-data', this.getInitData)
       .get(config.MEMPOOL.API_URL_PREFIX + 'validate-address/:address', this.validateAddress)
-      .get(config.MEMPOOL.API_URL_PREFIX + 'tx/:txId/replaces', this.getRbfHistory)
+      .get(config.MEMPOOL.API_URL_PREFIX + 'tx/:txId/rbf', this.getRbfHistory)
       .get(config.MEMPOOL.API_URL_PREFIX + 'tx/:txId/cached', this.getCachedTx)
+      .get(config.MEMPOOL.API_URL_PREFIX + 'replacements', this.getRbfReplacements)
+      .get(config.MEMPOOL.API_URL_PREFIX + 'fullrbf/replacements', this.getFullRbfReplacements)
       .post(config.MEMPOOL.API_URL_PREFIX + 'tx/push', this.$postTransactionForm)
       .get(config.MEMPOOL.API_URL_PREFIX + 'donations', async (req, res) => {
         try {
@@ -94,6 +96,7 @@ class BitcoinRoutes {
       .get(config.MEMPOOL.API_URL_PREFIX + 'block/:hash', this.getBlock)
       .get(config.MEMPOOL.API_URL_PREFIX + 'block/:hash/summary', this.getStrippedBlockTransactions)
       .get(config.MEMPOOL.API_URL_PREFIX + 'block/:hash/audit-summary', this.getBlockAuditSummary)
+      .get(config.MEMPOOL.API_URL_PREFIX + 'blocks/tip/height', this.getBlockTipHeight)
       .post(config.MEMPOOL.API_URL_PREFIX + 'psbt/addparents', this.postPsbtCompletion)
       .get(config.MEMPOOL.API_URL_PREFIX + 'blocks-bulk/:from', this.getBlocksByBulk.bind(this))
       .get(config.MEMPOOL.API_URL_PREFIX + 'blocks-bulk/:from/:to', this.getBlocksByBulk.bind(this))
@@ -110,7 +113,6 @@ class BitcoinRoutes {
           .get(config.MEMPOOL.API_URL_PREFIX + 'tx/:txId/status', this.getTransactionStatus)
           .get(config.MEMPOOL.API_URL_PREFIX + 'tx/:txId/outspends', this.getTransactionOutspends)
           .get(config.MEMPOOL.API_URL_PREFIX + 'block/:hash/header', this.getBlockHeader)
-          .get(config.MEMPOOL.API_URL_PREFIX + 'blocks/tip/height', this.getBlockTipHeight)
           .get(config.MEMPOOL.API_URL_PREFIX + 'blocks/tip/hash', this.getBlockTipHash)
           .get(config.MEMPOOL.API_URL_PREFIX + 'block/:hash/raw', this.getRawBlock)
           .get(config.MEMPOOL.API_URL_PREFIX + 'block/:hash/txids', this.getTxIdsForBlock)
@@ -128,8 +130,9 @@ class BitcoinRoutes {
 
   private getInitData(req: Request, res: Response) {
     try {
-      const result = websocketHandler.getInitData();
+      const result = websocketHandler.getSerializedInitData();
-      res.json(result);
+      res.set('Content-Type', 'application/json');
+      res.send(result);
     } catch (e) {
       res.status(500).send(e instanceof Error ? e.message : e);
     }
@@ -589,10 +592,14 @@ class BitcoinRoutes {
     }
   }
 
-  private async getBlockTipHeight(req: Request, res: Response) {
+  private getBlockTipHeight(req: Request, res: Response) {
     try {
-      const result = await bitcoinApi.$getBlockHeightTip();
+      const result = blocks.getCurrentBlockHeight();
-      res.json(result);
+      if (!result) {
+        return res.status(503).send(`Service Temporarily Unavailable`);
+      }
+      res.setHeader('content-type', 'text/plain');
+      res.send(result.toString());
     } catch (e) {
       res.status(500).send(e instanceof Error ? e.message : e);
     }
@@ -638,8 +645,30 @@ class BitcoinRoutes {
 
   private async getRbfHistory(req: Request, res: Response) {
     try {
-      const result = rbfCache.getReplaces(req.params.txId);
+      const replacements = rbfCache.getRbfTree(req.params.txId) || null;
-      res.json(result || []);
+      const replaces = rbfCache.getReplaces(req.params.txId) || null;
+      res.json({
+        replacements,
+        replaces
+      });
+    } catch (e) {
+      res.status(500).send(e instanceof Error ? e.message : e);
+    }
+  }
+
+  private async getRbfReplacements(req: Request, res: Response) {
+    try {
+      const result = rbfCache.getRbfTrees(false);
+      res.json(result);
+    } catch (e) {
+      res.status(500).send(e instanceof Error ? e.message : e);
+    }
+  }
+
+  private async getFullRbfReplacements(req: Request, res: Response) {
+    try {
+      const result = rbfCache.getRbfTrees(true);
+      res.json(result);
     } catch (e) {
       res.status(500).send(e instanceof Error ? e.message : e);
     }

backend/src/api/bitcoin/esplora-api.ts

@@ -3,65 +3,102 @@ import axios, { AxiosRequestConfig } from 'axios';
 import http from 'http';
 import { AbstractBitcoinApi } from './bitcoin-api-abstract-factory';
 import { IEsploraApi } from './esplora-api.interface';
+import logger from '../../logger';
 
 const axiosConnection = axios.create({
-  httpAgent: new http.Agent({ keepAlive: true })
+  httpAgent: new http.Agent({ keepAlive: true, })
 });
 
 class ElectrsApi implements AbstractBitcoinApi {
-  axiosConfig: AxiosRequestConfig = {
+  private axiosConfigWithUnixSocket: AxiosRequestConfig = config.ESPLORA.UNIX_SOCKET_PATH ? {
+    socketPath: config.ESPLORA.UNIX_SOCKET_PATH,
+    timeout: 10000,
+  } : {
+    timeout: 10000,
+  };
+  private axiosConfigTcpSocketOnly: AxiosRequestConfig = {
     timeout: 10000,
   };
 
-  constructor() { }
+  unixSocketRetryTimeout;
+  activeAxiosConfig;
+
+  constructor() {
+    this.activeAxiosConfig = this.axiosConfigWithUnixSocket;
+  }
+
+  fallbackToTcpSocket() {
+    if (!this.unixSocketRetryTimeout) {
+      logger.err(`Unable to connect to esplora unix socket. Falling back to tcp socket. Retrying unix socket in ${config.ESPLORA.RETRY_UNIX_SOCKET_AFTER / 1000} seconds`);
+      // Retry the unix socket after a few seconds
+      this.unixSocketRetryTimeout = setTimeout(() => {
+        logger.info(`Retrying to use unix socket for esplora now (applied for the next query)`);
+        this.activeAxiosConfig = this.axiosConfigWithUnixSocket;
+        this.unixSocketRetryTimeout = undefined;
+      }, config.ESPLORA.RETRY_UNIX_SOCKET_AFTER);
+    }
+
+    // Use the TCP socket (reach a different esplora instance through nginx)
+    this.activeAxiosConfig = this.axiosConfigTcpSocketOnly;
+  }
+
+  $queryWrapper<T>(url, responseType = 'json'): Promise<T> {
+    return axiosConnection.get<T>(url, { ...this.activeAxiosConfig, responseType: responseType })
+      .then((response) => response.data)
+      .catch((e) => {
+        if (e?.code === 'ECONNREFUSED') {
+          this.fallbackToTcpSocket();
+          // Retry immediately
+          return axiosConnection.get<T>(url, this.activeAxiosConfig)
+            .then((response) => response.data)
+            .catch((e) => {
+              logger.warn(`Cannot query esplora through the unix socket nor the tcp socket. Exception ${e}`);
+              throw e;
+            });
+        } else {
+          throw e;
+        }
+      });
+  }
 
   $getRawMempool(): Promise<IEsploraApi.Transaction['txid'][]> {
-    return axiosConnection.get<IEsploraApi.Transaction['txid'][]>(config.ESPLORA.REST_API_URL + '/mempool/txids', this.axiosConfig)
+    return this.$queryWrapper<IEsploraApi.Transaction['txid'][]>(config.ESPLORA.REST_API_URL + '/mempool/txids');
-      .then((response) => response.data);
   }
 
   $getRawTransaction(txId: string): Promise<IEsploraApi.Transaction> {
-    return axiosConnection.get<IEsploraApi.Transaction>(config.ESPLORA.REST_API_URL + '/tx/' + txId, this.axiosConfig)
+    return this.$queryWrapper<IEsploraApi.Transaction>(config.ESPLORA.REST_API_URL + '/tx/' + txId);
-      .then((response) => response.data);
   }
 
   $getTransactionHex(txId: string): Promise<string> {
-    return axiosConnection.get<string>(config.ESPLORA.REST_API_URL + '/tx/' + txId + '/hex', this.axiosConfig)
+    return this.$queryWrapper<string>(config.ESPLORA.REST_API_URL + '/tx/' + txId + '/hex');
-      .then((response) => response.data);
   }
 
   $getBlockHeightTip(): Promise<number> {
-    return axiosConnection.get<number>(config.ESPLORA.REST_API_URL + '/blocks/tip/height', this.axiosConfig)
+    return this.$queryWrapper<number>(config.ESPLORA.REST_API_URL + '/blocks/tip/height');
-      .then((response) => response.data);
   }
 
   $getBlockHashTip(): Promise<string> {
-    return axiosConnection.get<string>(config.ESPLORA.REST_API_URL + '/blocks/tip/hash', this.axiosConfig)
+    return this.$queryWrapper<string>(config.ESPLORA.REST_API_URL + '/blocks/tip/hash');
-      .then((response) => response.data);
   }
 
   $getTxIdsForBlock(hash: string): Promise<string[]> {
-    return axiosConnection.get<string[]>(config.ESPLORA.REST_API_URL + '/block/' + hash + '/txids', this.axiosConfig)
+    return this.$queryWrapper<string[]>(config.ESPLORA.REST_API_URL + '/block/' + hash + '/txids');
-      .then((response) => response.data);
   }
 
   $getBlockHash(height: number): Promise<string> {
-    return axiosConnection.get<string>(config.ESPLORA.REST_API_URL + '/block-height/' + height, this.axiosConfig)
+    return this.$queryWrapper<string>(config.ESPLORA.REST_API_URL + '/block-height/' + height);
-      .then((response) => response.data);
   }
 
   $getBlockHeader(hash: string): Promise<string> {
-    return axiosConnection.get<string>(config.ESPLORA.REST_API_URL + '/block/' + hash + '/header', this.axiosConfig)
+    return this.$queryWrapper<string>(config.ESPLORA.REST_API_URL + '/block/' + hash + '/header');
-      .then((response) => response.data);
   }
 
   $getBlock(hash: string): Promise<IEsploraApi.Block> {
-    return axiosConnection.get<IEsploraApi.Block>(config.ESPLORA.REST_API_URL + '/block/' + hash, this.axiosConfig)
+    return this.$queryWrapper<IEsploraApi.Block>(config.ESPLORA.REST_API_URL + '/block/' + hash);
-      .then((response) => response.data);
   }
 
   $getRawBlock(hash: string): Promise<Buffer> {
-    return axiosConnection.get<string>(config.ESPLORA.REST_API_URL + '/block/' + hash + "/raw", { ...this.axiosConfig, responseType: 'arraybuffer' })
+    return this.$queryWrapper<any>(config.ESPLORA.REST_API_URL + '/block/' + hash + "/raw", 'arraybuffer')
       .then((response) => { return Buffer.from(response.data); });
   }
 
@@ -82,13 +119,11 @@ class ElectrsApi implements AbstractBitcoinApi {
   }
 
   $getOutspend(txId: string, vout: number): Promise<IEsploraApi.Outspend> {
-    return axiosConnection.get<IEsploraApi.Outspend>(config.ESPLORA.REST_API_URL + '/tx/' + txId + '/outspend/' + vout, this.axiosConfig)
+    return this.$queryWrapper<IEsploraApi.Outspend>(config.ESPLORA.REST_API_URL + '/tx/' + txId + '/outspend/' + vout);
-      .then((response) => response.data);
   }
 
   $getOutspends(txId: string): Promise<IEsploraApi.Outspend[]> {
-    return axiosConnection.get<IEsploraApi.Outspend[]>(config.ESPLORA.REST_API_URL + '/tx/' + txId + '/outspends', this.axiosConfig)
+    return this.$queryWrapper<IEsploraApi.Outspend[]>(config.ESPLORA.REST_API_URL + '/tx/' + txId + '/outspends');
-      .then((response) => response.data);
   }
 
   async $getBatchedOutspends(txId: string[]): Promise<IEsploraApi.Outspend[][]> {

backend/src/api/blocks.ts

@@ -36,6 +36,8 @@ class Blocks {
   private newBlockCallbacks: ((block: BlockExtended, txIds: string[], transactions: TransactionExtended[]) => void)[] = [];
   private newAsyncBlockCallbacks: ((block: BlockExtended, txIds: string[], transactions: TransactionExtended[]) => Promise<void>)[] = [];
 
+  private mainLoopTimeout: number = 120000;
+
   constructor() { }
 
   public getBlocks(): BlockExtended[] {
@@ -410,12 +412,13 @@ class Blocks {
     try {
       // Get all indexed block hash
       const unindexedBlockHeights = await blocksRepository.$getCPFPUnindexedBlocks();
-      logger.info(`Indexing cpfp data for ${unindexedBlockHeights.length} blocks`);
 
       if (!unindexedBlockHeights?.length) {
         return;
       }
 
+      logger.info(`Indexing cpfp data for ${unindexedBlockHeights.length} blocks`);
+
       // Logging
       let count = 0;
       let countThisRun = 0;
@@ -526,9 +529,16 @@ class Blocks {
     return await BlocksRepository.$validateChain();
   }
 
-  public async $updateBlocks() {
+  public async $updateBlocks(): Promise<number> {
+    // warn if this run stalls the main loop for more than 2 minutes
+    const timer = this.startTimer();
+
+    diskCache.lock();
+
     let fastForwarded = false;
+    let handledBlocks = 0;
     const blockHeightTip = await bitcoinApi.$getBlockHeightTip();
+    this.updateTimerProgress(timer, 'got block height tip');
 
     if (this.blocks.length === 0) {
       this.currentBlockHeight = Math.max(blockHeightTip - config.MEMPOOL.INITIAL_BLOCKS_AMOUNT, -1);
@@ -546,16 +556,21 @@ class Blocks {
 
     if (!this.lastDifficultyAdjustmentTime) {
       const blockchainInfo = await bitcoinClient.getBlockchainInfo();
+      this.updateTimerProgress(timer, 'got blockchain info for initial difficulty adjustment');
       if (blockchainInfo.blocks === blockchainInfo.headers) {
         const heightDiff = blockHeightTip % 2016;
         const blockHash = await bitcoinApi.$getBlockHash(blockHeightTip - heightDiff);
+        this.updateTimerProgress(timer, 'got block hash for initial difficulty adjustment');
         const block: IEsploraApi.Block = await bitcoinCoreApi.$getBlock(blockHash);
+        this.updateTimerProgress(timer, 'got block for initial difficulty adjustment');
         this.lastDifficultyAdjustmentTime = block.timestamp;
         this.currentDifficulty = block.difficulty;
 
         if (blockHeightTip >= 2016) {
           const previousPeriodBlockHash = await bitcoinApi.$getBlockHash(blockHeightTip - heightDiff - 2016);
+          this.updateTimerProgress(timer, 'got previous block hash for initial difficulty adjustment');
           const previousPeriodBlock: IEsploraApi.Block = await bitcoinCoreApi.$getBlock(previousPeriodBlockHash);
+          this.updateTimerProgress(timer, 'got previous block for initial difficulty adjustment');
           this.previousDifficultyRetarget = (block.difficulty - previousPeriodBlock.difficulty) / previousPeriodBlock.difficulty * 100;
           logger.debug(`Initial difficulty adjustment data set.`);
         }
@@ -570,9 +585,11 @@ class Blocks {
       } else {
         this.currentBlockHeight++;
         logger.debug(`New block found (#${this.currentBlockHeight})!`);
+        this.updateTimerProgress(timer, `getting orphaned blocks for ${this.currentBlockHeight}`);
         await chainTips.updateOrphanedBlocks();
       }
 
+      this.updateTimerProgress(timer, `getting block data for ${this.currentBlockHeight}`);
       const blockHash = await bitcoinApi.$getBlockHash(this.currentBlockHeight);
       const verboseBlock = await bitcoinClient.getBlock(blockHash, 2);
       const block = BitcoinApi.convertBlock(verboseBlock);
@@ -581,42 +598,53 @@ class Blocks {
       const cpfpSummary: CpfpSummary = Common.calculateCpfp(block.height, transactions);
       const blockExtended: BlockExtended = await this.$getBlockExtended(block, cpfpSummary.transactions);
       const blockSummary: BlockSummary = this.summarizeBlock(verboseBlock);
+      this.updateTimerProgress(timer, `got block data for ${this.currentBlockHeight}`);
 
       // start async callbacks
+      this.updateTimerProgress(timer, `starting async callbacks for ${this.currentBlockHeight}`);
       const callbackPromises = this.newAsyncBlockCallbacks.map((cb) => cb(blockExtended, txIds, transactions));
 
       if (Common.indexingEnabled()) {
         if (!fastForwarded) {
           const lastBlock = await blocksRepository.$getBlockByHeight(blockExtended.height - 1);
+          this.updateTimerProgress(timer, `got block by height for ${this.currentBlockHeight}`);
           if (lastBlock !== null && blockExtended.previousblockhash !== lastBlock.id) {
-            logger.warn(`Chain divergence detected at block ${lastBlock.height}, re-indexing most recent data`);
+            logger.warn(`Chain divergence detected at block ${lastBlock.height}, re-indexing most recent data`, logger.tags.mining);
             // We assume there won't be a reorg with more than 10 block depth
+            this.updateTimerProgress(timer, `rolling back diverged chain from ${this.currentBlockHeight}`);
             await BlocksRepository.$deleteBlocksFrom(lastBlock.height - 10);
             await HashratesRepository.$deleteLastEntries();
-            await BlocksSummariesRepository.$deleteBlocksFrom(lastBlock.height - 10);
             await cpfpRepository.$deleteClustersFrom(lastBlock.height - 10);
+            this.updateTimerProgress(timer, `rolled back chain divergence from ${this.currentBlockHeight}`);
             for (let i = 10; i >= 0; --i) {
               const newBlock = await this.$indexBlock(lastBlock.height - i);
+              this.updateTimerProgress(timer, `reindexed block`);
               await this.$getStrippedBlockTransactions(newBlock.id, true, true);
+              this.updateTimerProgress(timer, `reindexed block summary`);
               if (config.MEMPOOL.CPFP_INDEXING) {
                 await this.$indexCPFP(newBlock.id, lastBlock.height - i);
+                this.updateTimerProgress(timer, `reindexed block cpfp`);
               }
             }
             await mining.$indexDifficultyAdjustments();
             await DifficultyAdjustmentsRepository.$deleteLastAdjustment();
-            logger.info(`Re-indexed 10 blocks and summaries. Also re-indexed the last difficulty adjustments. Will re-index latest hashrates in a few seconds.`);
+            this.updateTimerProgress(timer, `reindexed difficulty adjustments`);
+            logger.info(`Re-indexed 10 blocks and summaries. Also re-indexed the last difficulty adjustments. Will re-index latest hashrates in a few seconds.`, logger.tags.mining);
             indexer.reindex();
           }
           await blocksRepository.$saveBlockInDatabase(blockExtended);
+          this.updateTimerProgress(timer, `saved ${this.currentBlockHeight} to database`);
 
           const lastestPriceId = await PricesRepository.$getLatestPriceId();
+          this.updateTimerProgress(timer, `got latest price id ${this.currentBlockHeight}`);
           if (priceUpdater.historyInserted === true && lastestPriceId !== null) {
             await blocksRepository.$saveBlockPrices([{
               height: blockExtended.height,
               priceId: lastestPriceId,
             }]);
+            this.updateTimerProgress(timer, `saved prices for ${this.currentBlockHeight}`);
           } else {
-            logger.info(`Cannot save block price for ${blockExtended.height} because the price updater hasnt completed yet. Trying again in 10 seconds.`, logger.tags.mining);
+            logger.debug(`Cannot save block price for ${blockExtended.height} because the price updater hasnt completed yet. Trying again in 10 seconds.`, logger.tags.mining);
             setTimeout(() => {
               indexer.runSingleTask('blocksPrices');
             }, 10000);
@@ -625,9 +653,11 @@ class Blocks {
           // Save blocks summary for visualization if it's enabled
           if (Common.blocksSummariesIndexingEnabled() === true) {
             await this.$getStrippedBlockTransactions(blockExtended.id, true);
+            this.updateTimerProgress(timer, `saved block summary for ${this.currentBlockHeight}`);
           }
           if (config.MEMPOOL.CPFP_INDEXING) {
             this.$saveCpfp(blockExtended.id, this.currentBlockHeight, cpfpSummary);
+            this.updateTimerProgress(timer, `saved cpfp for ${this.currentBlockHeight}`);
           }
         }
       }
@@ -640,6 +670,7 @@ class Blocks {
             difficulty: block.difficulty,
             adjustment: Math.round((block.difficulty / this.currentDifficulty) * 1000000) / 1000000, // Remove float point noise
           });
+          this.updateTimerProgress(timer, `saved difficulty adjustment for ${this.currentBlockHeight}`);
         }
 
         this.previousDifficultyRetarget = (block.difficulty - this.currentDifficulty) / this.currentDifficulty * 100;
@@ -664,7 +695,39 @@ class Blocks {
       }
 
       // wait for pending async callbacks to finish
+      this.updateTimerProgress(timer, `waiting for async callbacks to complete for ${this.currentBlockHeight}`);
       await Promise.all(callbackPromises);
+      this.updateTimerProgress(timer, `async callbacks completed for ${this.currentBlockHeight}`);
+
+      handledBlocks++;
+    }
+
+    diskCache.unlock();
+
+    this.clearTimer(timer);
+
+    return handledBlocks;
+  }
+
+  private startTimer() {
+    const state: any = {
+      start: Date.now(),
+      progress: 'begin $updateBlocks',
+      timer: null,
+    };
+    state.timer = setTimeout(() => {
+      logger.err(`$updateBlocks stalled at "${state.progress}"`);
+    }, this.mainLoopTimeout);
+    return state;
+  }
+
+  private updateTimerProgress(state, msg) {
+    state.progress = msg;
+  }
+
+  private clearTimer(state) {
+    if (state.timer) {
+      clearTimeout(state.timer);
     }
   }
 
@@ -736,7 +799,7 @@ class Blocks {
 
     // Index the response if needed
     if (Common.blocksSummariesIndexingEnabled() === true) {
-      await BlocksSummariesRepository.$saveSummary({height: block.height, mined: summary});
+      await BlocksSummariesRepository.$saveTransactions(block.height, block.hash, summary.transactions);
     }
 
     return summary.transactions;
@@ -852,11 +915,12 @@ class Blocks {
         if (cleanBlock.fee_amt_percentiles === null) {
           const block = await bitcoinClient.getBlock(cleanBlock.hash, 2);
           const summary = this.summarizeBlock(block);
-          await BlocksSummariesRepository.$saveSummary({ height: block.height, mined: summary });
+          await BlocksSummariesRepository.$saveTransactions(cleanBlock.height, cleanBlock.hash, summary.transactions);
           cleanBlock.fee_amt_percentiles = await BlocksSummariesRepository.$getFeePercentilesByBlockId(cleanBlock.hash);
         }
         if (cleanBlock.fee_amt_percentiles !== null) {
           cleanBlock.median_fee_amt = cleanBlock.fee_amt_percentiles[3];
+          await blocksRepository.$updateFeeAmounts(cleanBlock.hash, cleanBlock.fee_amt_percentiles, cleanBlock.median_fee_amt);
         }
       }
 

backend/src/api/common.ts

@@ -57,11 +57,11 @@ export class Common {
     return arr;
   }
 
-  static findRbfTransactions(added: TransactionExtended[], deleted: TransactionExtended[]): { [txid: string]: TransactionExtended } {
+  static findRbfTransactions(added: TransactionExtended[], deleted: TransactionExtended[]): { [txid: string]: TransactionExtended[] } {
-    const matches: { [txid: string]: TransactionExtended } = {};
+    const matches: { [txid: string]: TransactionExtended[] } = {};
-    deleted
+    added
-      .forEach((deletedTx) => {
+      .forEach((addedTx) => {
-        const foundMatches = added.find((addedTx) => {
+        const foundMatches = deleted.filter((deletedTx) => {
           // The new tx must, absolutely speaking, pay at least as much fee as the replaced tx.
           return addedTx.fee > deletedTx.fee
             // The new transaction must pay more fee per kB than the replaced tx.
@@ -70,8 +70,8 @@ export class Common {
             && deletedTx.vin.some((deletedVin) =>
               addedTx.vin.some((vin) => vin.txid === deletedVin.txid && vin.vout === deletedVin.vout));
             });
-        if (foundMatches) {
+        if (foundMatches?.length) {
-          matches[deletedTx.txid] = foundMatches;
+          matches[addedTx.txid] = foundMatches;
         }
       });
     return matches;
@@ -83,6 +83,7 @@ export class Common {
       fee: tx.fee,
       vsize: tx.weight / 4,
       value: tx.vout.reduce((acc, vout) => acc + (vout.value ? vout.value : 0), 0),
+      rate: tx.effectiveFeePerVsize,
     };
   }
 

backend/src/api/disk-cache.ts

@@ -7,17 +7,26 @@ import logger from '../logger';
 import config from '../config';
 import { TransactionExtended } from '../mempool.interfaces';
 import { Common } from './common';
+import rbfCache from './rbf-cache';
 
 class DiskCache {
   private cacheSchemaVersion = 3;
+  private rbfCacheSchemaVersion = 1;
 
   private static TMP_FILE_NAME = config.MEMPOOL.CACHE_DIR + '/tmp-cache.json';
   private static TMP_FILE_NAMES = config.MEMPOOL.CACHE_DIR + '/tmp-cache{number}.json';
   private static FILE_NAME = config.MEMPOOL.CACHE_DIR + '/cache.json';
   private static FILE_NAMES = config.MEMPOOL.CACHE_DIR + '/cache{number}.json';
+  private static TMP_RBF_FILE_NAME = config.MEMPOOL.CACHE_DIR + '/tmp-rbfcache.json';
+  private static RBF_FILE_NAME = config.MEMPOOL.CACHE_DIR + '/rbfcache.json';
   private static CHUNK_FILES = 25;
   private isWritingCache = false;
 
+  private semaphore: { resume: (() => void)[], locks: number } = {
+    resume: [],
+    locks: 0,
+  };
+
   constructor() {
     if (!cluster.isPrimary) {
       return;
@@ -43,7 +52,7 @@ class DiskCache {
       const mempool = memPool.getMempool();
       const mempoolArray: TransactionExtended[] = [];
       for (const tx in mempool) {
-        if (mempool[tx] && !mempool[tx].deleteAfter) {
+        if (mempool[tx]) {
           mempoolArray.push(mempool[tx]);
         }
       }
@@ -73,6 +82,7 @@ class DiskCache {
           fs.renameSync(DiskCache.TMP_FILE_NAMES.replace('{number}', i.toString()), DiskCache.FILE_NAMES.replace('{number}', i.toString()));
         }
       } else {
+        await this.$yield();
         await fsPromises.writeFile(DiskCache.TMP_FILE_NAME, JSON.stringify({
           network: config.MEMPOOL.NETWORK,
           cacheSchemaVersion: this.cacheSchemaVersion,
@@ -82,6 +92,7 @@ class DiskCache {
           mempoolArray: mempoolArray.splice(0, chunkSize),
         }), { flag: 'w' });
         for (let i = 1; i < DiskCache.CHUNK_FILES; i++) {
+          await this.$yield();
           await fsPromises.writeFile(DiskCache.TMP_FILE_NAMES.replace('{number}', i.toString()), JSON.stringify({
             mempool: {},
             mempoolArray: mempoolArray.splice(0, chunkSize),
@@ -100,6 +111,32 @@ class DiskCache {
       logger.warn('Error writing to cache file: ' + (e instanceof Error ? e.message : e));
       this.isWritingCache = false;
     }
+
+    try {
+      logger.debug('Writing rbf data to disk cache (async)...');
+      this.isWritingCache = true;
+      const rbfData = rbfCache.dump();
+      if (sync) {
+        fs.writeFileSync(DiskCache.TMP_RBF_FILE_NAME, JSON.stringify({
+          network: config.MEMPOOL.NETWORK,
+          rbfCacheSchemaVersion: this.rbfCacheSchemaVersion,
+          rbf: rbfData,
+        }), { flag: 'w' });
+        fs.renameSync(DiskCache.TMP_RBF_FILE_NAME, DiskCache.RBF_FILE_NAME);
+      } else {
+        await fsPromises.writeFile(DiskCache.TMP_RBF_FILE_NAME, JSON.stringify({
+          network: config.MEMPOOL.NETWORK,
+          rbfCacheSchemaVersion: this.rbfCacheSchemaVersion,
+          rbf: rbfData,
+        }), { flag: 'w' });
+        await fsPromises.rename(DiskCache.TMP_RBF_FILE_NAME, DiskCache.RBF_FILE_NAME);
+      }
+      logger.debug('Rbf data saved to disk cache');
+      this.isWritingCache = false;
+    } catch (e) {
+      logger.warn('Error writing rbf data to cache file: ' + (e instanceof Error ? e.message : e));
+      this.isWritingCache = false;
+    }
   }
 
   wipeCache(): void {
@@ -124,7 +161,19 @@ class DiskCache {
     }
   }
 
-  loadMempoolCache(): void {
+  wipeRbfCache() {
+    logger.notice(`Wipping nodejs backend cache/rbfcache.json file`);
+
+    try {
+      fs.unlinkSync(DiskCache.RBF_FILE_NAME);
+    } catch (e: any) {
+      if (e?.code !== 'ENOENT') {
+        logger.err(`Cannot wipe cache file ${DiskCache.RBF_FILE_NAME}. Exception ${JSON.stringify(e)}`);
+      }
+    }
+  }
+
+  async $loadMempoolCache(): Promise<void> {
     if (!fs.existsSync(DiskCache.FILE_NAME)) {
       return;
     }
@@ -164,16 +213,65 @@ class DiskCache {
             }
           }
         } catch (e) {
-          logger.info('Error parsing ' + fileName + '. Skipping. Reason: ' + (e instanceof Error ? e.message : e));
+          logger.err('Error parsing ' + fileName + '. Skipping. Reason: ' + (e instanceof Error ? e.message : e));
         }
       }
 
-      memPool.setMempool(data.mempool);
+      await memPool.$setMempool(data.mempool);
       blocks.setBlocks(data.blocks);
       blocks.setBlockSummaries(data.blockSummaries || []);
     } catch (e) {
       logger.warn('Failed to parse mempoool and blocks cache. Skipping. Reason: ' + (e instanceof Error ? e.message : e));
     }
+
+    try {
+      let rbfData: any = {};
+      const rbfCacheData = fs.readFileSync(DiskCache.RBF_FILE_NAME, 'utf8');
+      if (rbfCacheData) {
+        logger.info('Restoring rbf data from disk cache');
+        rbfData = JSON.parse(rbfCacheData);
+        if (rbfData.rbfCacheSchemaVersion === undefined || rbfData.rbfCacheSchemaVersion !== this.rbfCacheSchemaVersion) {
+          logger.notice('Rbf disk cache contains an outdated schema version. Clearing it and skipping the cache loading.');
+          return this.wipeRbfCache();
+        }
+        if (rbfData.network && rbfData.network !== config.MEMPOOL.NETWORK) {
+          logger.notice('Rbf disk cache contains data from a different network. Clearing it and skipping the cache loading.');
+          return this.wipeRbfCache();
+        }
+      }
+
+      if (rbfData?.rbf) {
+        rbfCache.load(rbfData.rbf);
+      }
+    } catch (e) {
+      logger.warn('Failed to parse rbf cache. Skipping. Reason: ' + (e instanceof Error ? e.message : e));
+    }
+  }
+
+  private $yield(): Promise<void> {
+    if (this.semaphore.locks) {
+      logger.debug('Pause writing mempool and blocks data to disk cache (async)');
+      return new Promise((resolve) => {
+        this.semaphore.resume.push(resolve);
+      });
+    } else {
+      return Promise.resolve();
+    }
+  }
+
+  public lock(): void {
+    this.semaphore.locks++;
+  }
+
+  public unlock(): void {
+    this.semaphore.locks = Math.max(0, this.semaphore.locks - 1);
+    if (!this.semaphore.locks && this.semaphore.resume.length) {
+      const nextResume = this.semaphore.resume.shift();
+      if (nextResume) {
+        logger.debug('Resume writing mempool and blocks data to disk cache (async)');
+        nextResume();
+      }
+    }
   }
 }
 

backend/src/api/liquid/icons.ts

@@ -2,7 +2,7 @@ import * as fs from 'fs';
 import logger from '../../logger';
 
 class Icons {
-  private static FILE_NAME = './icons.json';
+  private static FILE_NAME = '/elements/asset_registry_db/icons.json';
   private iconIds: string[] = [];
   private icons: { [assetId: string]: string; } = {};
 

backend/src/api/mempool-blocks.ts

@@ -1,5 +1,5 @@
 import logger from '../logger';
-import { MempoolBlock, TransactionExtended, ThreadTransaction, TransactionStripped, MempoolBlockWithTransactions, MempoolBlockDelta, Ancestor } from '../mempool.interfaces';
+import { MempoolBlock, TransactionExtended, TransactionStripped, MempoolBlockWithTransactions, MempoolBlockDelta, Ancestor, CompactThreadTransaction } from '../mempool.interfaces';
 import { Common } from './common';
 import config from '../config';
 import { Worker } from 'worker_threads';
@@ -10,6 +10,9 @@ class MempoolBlocks {
   private mempoolBlockDeltas: MempoolBlockDelta[] = [];
   private txSelectionWorker: Worker | null = null;
 
+  private nextUid: number = 1;
+  private uidMap: Map<number, string> = new Map(); // map short numerical uids to full txids
+
   constructor() {}
 
   public getMempoolBlocks(): MempoolBlock[] {
@@ -54,7 +57,14 @@ class MempoolBlocks {
     });
 
     // First sort
-    memPoolArray.sort((a, b) => b.feePerVsize - a.feePerVsize);
+    memPoolArray.sort((a, b) => {
+      if (a.feePerVsize === b.feePerVsize) {
+        // tie-break by lexicographic txid order for stability
+        return a.txid < b.txid ? -1 : 1;
+      } else {
+        return b.feePerVsize - a.feePerVsize;
+      }
+    });
 
     // Loop through and traverse all ancestors and sum up all the sizes + fees
     // Pass down size + fee to all unconfirmed children
@@ -68,7 +78,14 @@ class MempoolBlocks {
     });
 
     // Final sort, by effective fee
-    memPoolArray.sort((a, b) => b.effectiveFeePerVsize - a.effectiveFeePerVsize);
+    memPoolArray.sort((a, b) => {
+      if (a.effectiveFeePerVsize === b.effectiveFeePerVsize) {
+        // tie-break by lexicographic txid order for stability
+        return a.txid < b.txid ? -1 : 1;
+      } else {
+        return b.effectiveFeePerVsize - a.effectiveFeePerVsize;
+      }
+    });
 
     const end = new Date().getTime();
     const time = end - start;
@@ -87,21 +104,45 @@ class MempoolBlocks {
 
   private calculateMempoolBlocks(transactionsSorted: TransactionExtended[]): MempoolBlockWithTransactions[] {
     const mempoolBlocks: MempoolBlockWithTransactions[] = [];
+    let blockSize = 0;
     let blockWeight = 0;
+    let blockVsize = 0;
+    let blockFees = 0;
+    const sizeLimit = (config.MEMPOOL.BLOCK_WEIGHT_UNITS / 4) * 1.2;
+    let transactionIds: string[] = [];
     let transactions: TransactionExtended[] = [];
     transactionsSorted.forEach((tx) => {
       if (blockWeight + tx.weight <= config.MEMPOOL.BLOCK_WEIGHT_UNITS
         || mempoolBlocks.length === config.MEMPOOL.MEMPOOL_BLOCKS_AMOUNT - 1) {
+        tx.position = {
+          block: mempoolBlocks.length,
+          vsize: blockVsize + (tx.vsize / 2),
+        };
         blockWeight += tx.weight;
-        transactions.push(tx);
+        blockVsize += tx.vsize;
+        blockSize += tx.size;
+        blockFees += tx.fee;
+        if (blockVsize <= sizeLimit) {
+          transactions.push(tx);
+        }
+        transactionIds.push(tx.txid);
       } else {
-        mempoolBlocks.push(this.dataToMempoolBlocks(transactions));
+        mempoolBlocks.push(this.dataToMempoolBlocks(transactionIds, transactions, blockSize, blockWeight, blockFees));
+        blockVsize = 0;
+        tx.position = {
+          block: mempoolBlocks.length,
+          vsize: blockVsize + (tx.vsize / 2),
+        };
+        blockVsize += tx.vsize;
         blockWeight = tx.weight;
+        blockSize = tx.size;
+        blockFees = tx.fee;
+        transactionIds = [tx.txid];
         transactions = [tx];
       }
     });
     if (transactions.length) {
-      mempoolBlocks.push(this.dataToMempoolBlocks(transactions));
+      mempoolBlocks.push(this.dataToMempoolBlocks(transactionIds, transactions, blockSize, blockWeight, blockFees));
     }
 
     return mempoolBlocks;
@@ -112,6 +153,7 @@ class MempoolBlocks {
     for (let i = 0; i < Math.max(mempoolBlocks.length, prevBlocks.length); i++) {
       let added: TransactionStripped[] = [];
       let removed: string[] = [];
+      const changed: { txid: string, rate: number | undefined }[] = [];
       if (mempoolBlocks[i] && !prevBlocks[i]) {
         added = mempoolBlocks[i].transactions;
       } else if (!mempoolBlocks[i] && prevBlocks[i]) {
@@ -120,7 +162,7 @@ class MempoolBlocks {
         const prevIds = {};
         const newIds = {};
         prevBlocks[i].transactions.forEach(tx => {
-          prevIds[tx.txid] = true;
+          prevIds[tx.txid] = tx;
         });
         mempoolBlocks[i].transactions.forEach(tx => {
           newIds[tx.txid] = true;
@@ -133,30 +175,43 @@ class MempoolBlocks {
         mempoolBlocks[i].transactions.forEach(tx => {
           if (!prevIds[tx.txid]) {
             added.push(tx);
+          } else if (tx.rate !== prevIds[tx.txid].rate) {
+            changed.push({ txid: tx.txid, rate: tx.rate });
           }
         });
       }
       mempoolBlockDeltas.push({
         added,
-        removed
+        removed,
+        changed,
       });
     }
     return mempoolBlockDeltas;
   }
 
-  public async makeBlockTemplates(newMempool: { [txid: string]: TransactionExtended }, saveResults: boolean = false): Promise<MempoolBlockWithTransactions[]> {
+  public async $makeBlockTemplates(newMempool: { [txid: string]: TransactionExtended }, saveResults: boolean = false): Promise<MempoolBlockWithTransactions[]> {
+    const start = Date.now();
+
+    // reset mempool short ids
+    this.resetUids();
+    for (const tx of Object.values(newMempool)) {
+      this.setUid(tx);
+    }
+
     // prepare a stripped down version of the mempool with only the minimum necessary data
     // to reduce the overhead of passing this data to the worker thread
-    const strippedMempool: { [txid: string]: ThreadTransaction } = {};
+    const strippedMempool: Map<number, CompactThreadTransaction> = new Map();
-    Object.values(newMempool).filter(tx => !tx.deleteAfter).forEach(entry => {
+    Object.values(newMempool).forEach(entry => {
-      strippedMempool[entry.txid] = {
+      if (entry.uid != null) {
-        txid: entry.txid,
+        strippedMempool.set(entry.uid, {
-        fee: entry.fee,
+          uid: entry.uid,
-        weight: entry.weight,
+          fee: entry.fee,
-        feePerVsize: entry.fee / (entry.weight / 4),
+          weight: entry.weight,
-        effectiveFeePerVsize: entry.fee / (entry.weight / 4),
+          feePerVsize: entry.fee / (entry.weight / 4),
-        vin: entry.vin.map(v => v.txid),
+          effectiveFeePerVsize: entry.effectiveFeePerVsize || (entry.fee / (entry.weight / 4)),
-      };
+          inputs: entry.vin.map(v => this.getUid(newMempool[v.txid])).filter(uid => uid != null) as number[],
+        });
+      }
     });
 
     // (re)initialize tx selection worker thread
@@ -175,7 +230,7 @@ class MempoolBlocks {
     // run the block construction algorithm in a separate thread, and wait for a result
     let threadErrorListener;
     try {
-      const workerResultPromise = new Promise<{ blocks: ThreadTransaction[][], clusters: { [root: string]: string[] } }>((resolve, reject) => {
+      const workerResultPromise = new Promise<{ blocks: number[][], rates: Map<number, number>, clusters: Map<number, number[]> }>((resolve, reject) => {
         threadErrorListener = reject;
         this.txSelectionWorker?.once('message', (result): void => {
           resolve(result);
@@ -183,123 +238,151 @@ class MempoolBlocks {
         this.txSelectionWorker?.once('error', reject);
       });
       this.txSelectionWorker.postMessage({ type: 'set', mempool: strippedMempool });
-      let { blocks, clusters } = await workerResultPromise;
+      const { blocks, rates, clusters } = this.convertResultTxids(await workerResultPromise);
-      // filter out stale transactions
-      const unfilteredCount = blocks.reduce((total, block) => { return total + block.length; }, 0);
-      blocks = blocks.map(block => block.filter(tx => (tx.txid && tx.txid in newMempool)));
-      const filteredCount = blocks.reduce((total, block) => { return total + block.length; }, 0);
-      if (filteredCount < unfilteredCount) {
-        logger.warn(`tx selection worker thread returned ${unfilteredCount - filteredCount} stale transactions from makeBlockTemplates`);
-      }
 
       // clean up thread error listener
       this.txSelectionWorker?.removeListener('error', threadErrorListener);
 
-      return this.processBlockTemplates(newMempool, blocks, clusters, saveResults);
+      const processed = this.processBlockTemplates(newMempool, blocks, rates, clusters, saveResults);
+      logger.debug(`makeBlockTemplates completed in ${(Date.now() - start)/1000} seconds`);
+      return processed;
     } catch (e) {
       logger.err('makeBlockTemplates failed. ' + (e instanceof Error ? e.message : e));
     }
     return this.mempoolBlocks;
   }
 
-  public async updateBlockTemplates(newMempool: { [txid: string]: TransactionExtended }, added: TransactionExtended[], removed: string[], saveResults: boolean = false): Promise<void> {
+  public async $updateBlockTemplates(newMempool: { [txid: string]: TransactionExtended }, added: TransactionExtended[], removed: TransactionExtended[], saveResults: boolean = false): Promise<void> {
     if (!this.txSelectionWorker) {
       // need to reset the worker
-      this.makeBlockTemplates(newMempool, saveResults);
+      await this.$makeBlockTemplates(newMempool, saveResults);
       return;
     }
+
+    const start = Date.now();
+
+    for (const tx of Object.values(added)) {
+      this.setUid(tx);
+    }
+    const removedUids = removed.map(tx => this.getUid(tx)).filter(uid => uid != null) as number[];
     // prepare a stripped down version of the mempool with only the minimum necessary data
     // to reduce the overhead of passing this data to the worker thread
-    const addedStripped: ThreadTransaction[] = added.map(entry => {
+    const addedStripped: CompactThreadTransaction[] = added.filter(entry => entry.uid != null).map(entry => {
       return {
-        txid: entry.txid,
+        uid: entry.uid || 0,
         fee: entry.fee,
         weight: entry.weight,
         feePerVsize: entry.fee / (entry.weight / 4),
-        effectiveFeePerVsize: entry.fee / (entry.weight / 4),
+        effectiveFeePerVsize: entry.effectiveFeePerVsize || (entry.fee / (entry.weight / 4)),
-        vin: entry.vin.map(v => v.txid),
+        inputs: entry.vin.map(v => this.getUid(newMempool[v.txid])).filter(uid => uid != null) as number[],
       };
     });
 
     // run the block construction algorithm in a separate thread, and wait for a result
     let threadErrorListener;
     try {
-      const workerResultPromise = new Promise<{ blocks: ThreadTransaction[][], clusters: { [root: string]: string[] } }>((resolve, reject) => {
+      const workerResultPromise = new Promise<{ blocks: number[][], rates: Map<number, number>, clusters: Map<number, number[]> }>((resolve, reject) => {
         threadErrorListener = reject;
         this.txSelectionWorker?.once('message', (result): void => {
           resolve(result);
         });
         this.txSelectionWorker?.once('error', reject);
       });
-      this.txSelectionWorker.postMessage({ type: 'update', added: addedStripped, removed });
+      this.txSelectionWorker.postMessage({ type: 'update', added: addedStripped, removed: removedUids });
-      let { blocks, clusters } = await workerResultPromise;
+      const { blocks, rates, clusters } = this.convertResultTxids(await workerResultPromise);
-      // filter out stale transactions
+
-      const unfilteredCount = blocks.reduce((total, block) => { return total + block.length; }, 0);
+      this.removeUids(removedUids);
-      blocks = blocks.map(block => block.filter(tx => (tx.txid && tx.txid in newMempool)));
-      const filteredCount = blocks.reduce((total, block) => { return total + block.length; }, 0);
-      if (filteredCount < unfilteredCount) {
-        logger.warn(`tx selection worker thread returned ${unfilteredCount - filteredCount} stale transactions from updateBlockTemplates`);
-      }
 
       // clean up thread error listener
       this.txSelectionWorker?.removeListener('error', threadErrorListener);
 
-      this.processBlockTemplates(newMempool, blocks, clusters, saveResults);
+      this.processBlockTemplates(newMempool, blocks, rates, clusters, saveResults);
+      logger.debug(`updateBlockTemplates completed in ${(Date.now() - start) / 1000} seconds`);
     } catch (e) {
       logger.err('updateBlockTemplates failed. ' + (e instanceof Error ? e.message : e));
     }
   }
 
-  private processBlockTemplates(mempool, blocks, clusters, saveResults): MempoolBlockWithTransactions[] {
+  private processBlockTemplates(mempool, blocks: string[][], rates: { [root: string]: number }, clusters: { [root: string]: string[] }, saveResults): MempoolBlockWithTransactions[] {
-    // update this thread's mempool with the results
+    for (const txid of Object.keys(rates)) {
-    blocks.forEach(block => {
+      if (txid in mempool) {
-      block.forEach(tx => {
+        mempool[txid].effectiveFeePerVsize = rates[txid];
-        if (tx.txid && tx.txid in mempool) {
+      }
-          if (tx.effectiveFeePerVsize != null) {
+    }
-            mempool[tx.txid].effectiveFeePerVsize = tx.effectiveFeePerVsize;
-          }
-          if (tx.cpfpRoot && tx.cpfpRoot in clusters) {
-            const ancestors: Ancestor[] = [];
-            const descendants: Ancestor[] = [];
-            const cluster = clusters[tx.cpfpRoot];
-            let matched = false;
-            cluster.forEach(txid => {
-              if (!txid || !mempool[txid]) {
-                logger.warn('projected transaction ancestor missing from mempool cache');
-                return;
-              }
-              if (txid === tx.txid) {
-                matched = true;
-              } else {
-                const relative = {
-                  txid: txid,
-                  fee: mempool[txid].fee,
-                  weight: mempool[txid].weight,
-                };
-                if (matched) {
-                  descendants.push(relative);
-                } else {
-                  ancestors.push(relative);
-                }
-              }
-            });
-            mempool[tx.txid].ancestors = ancestors;
-            mempool[tx.txid].descendants = descendants;
-            mempool[tx.txid].bestDescendant = null;
-          }
-          mempool[tx.txid].cpfpChecked = tx.cpfpChecked;
-        } else {
-          logger.warn('projected transaction missing from mempool cache');
-        }
-      });
-    });
 
-    // unpack the condensed blocks into proper mempool blocks
+    const readyBlocks: { transactionIds, transactions, totalSize, totalWeight, totalFees }[] = [];
-    const mempoolBlocks = blocks.map((transactions) => {
+    const sizeLimit = (config.MEMPOOL.BLOCK_WEIGHT_UNITS / 4) * 1.2;
-      return this.dataToMempoolBlocks(transactions.map(tx => {
+    // update this thread's mempool with the results
-        return mempool[tx.txid] || null;
+    for (let blockIndex = 0; blockIndex < blocks.length; blockIndex++) {
-      }).filter(tx => !!tx));
+      const block: string[] = blocks[blockIndex];
-    });
+      let txid: string;
+      let mempoolTx: TransactionExtended;
+      let totalSize = 0;
+      let totalVsize = 0;
+      let totalWeight = 0;
+      let totalFees = 0;
+      const transactions: TransactionExtended[] = [];
+      for (let txIndex = 0; txIndex < block.length; txIndex++) {
+        txid = block[txIndex];
+        if (txid) {
+          mempoolTx = mempool[txid];
+          // save position in projected blocks
+          mempoolTx.position = {
+            block: blockIndex,
+            vsize: totalVsize + (mempoolTx.vsize / 2),
+          };
+          mempoolTx.cpfpChecked = true;
+
+          totalSize += mempoolTx.size;
+          totalVsize += mempoolTx.vsize;
+          totalWeight += mempoolTx.weight;
+          totalFees += mempoolTx.fee;
+
+          if (totalVsize <= sizeLimit) {
+            transactions.push(mempoolTx);
+          }
+        }
+      }
+      readyBlocks.push({
+        transactionIds: block,
+        transactions,
+        totalSize,
+        totalWeight,
+        totalFees
+      });
+    }
+
+    for (const cluster of Object.values(clusters)) {
+      for (const memberTxid of cluster) {
+        if (memberTxid in mempool) {
+          const mempoolTx = mempool[memberTxid];
+          const ancestors: Ancestor[] = [];
+          const descendants: Ancestor[] = [];
+          let matched = false;
+          cluster.forEach(txid => {
+            if (txid === memberTxid) {
+              matched = true;
+            } else {
+              const relative = {
+                txid: txid,
+                fee: mempool[txid].fee,
+                weight: mempool[txid].weight,
+              };
+              if (matched) {
+                descendants.push(relative);
+              } else {
+                ancestors.push(relative);
+              }
+            }
+          });
+          mempoolTx.ancestors = ancestors;
+          mempoolTx.descendants = descendants;
+          mempoolTx.bestDescendant = null;
+        }
+      }
+    }
+
+    const mempoolBlocks = readyBlocks.map(b => this.dataToMempoolBlocks(b.transactionIds, b.transactions, b.totalSize, b.totalWeight, b.totalFees));
 
     if (saveResults) {
       const deltas = this.calculateMempoolDeltas(this.mempoolBlocks, mempoolBlocks);
@@ -310,29 +393,69 @@ class MempoolBlocks {
     return mempoolBlocks;
   }
 
-  private dataToMempoolBlocks(transactions: TransactionExtended[]): MempoolBlockWithTransactions {
+  private dataToMempoolBlocks(transactionIds: string[], transactions: TransactionExtended[], totalSize: number, totalWeight: number, totalFees: number): MempoolBlockWithTransactions {
-    let totalSize = 0;
-    let totalWeight = 0;
-    const fitTransactions: TransactionExtended[] = [];
-    transactions.forEach(tx => {
-      totalSize += tx.size;
-      totalWeight += tx.weight;
-      if ((totalWeight + tx.weight) <= config.MEMPOOL.BLOCK_WEIGHT_UNITS * 1.2) {
-        fitTransactions.push(tx);
-      }
-    });
     const feeStats = Common.calcEffectiveFeeStatistics(transactions);
     return {
       blockSize: totalSize,
-      blockVSize: totalWeight / 4,
+      blockVSize: (totalWeight / 4), // fractional vsize to avoid rounding errors
-      nTx: transactions.length,
+      nTx: transactionIds.length,
-      totalFees: transactions.reduce((acc, cur) => acc + cur.fee, 0),
+      totalFees: totalFees,
       medianFee: feeStats.medianFee, // Common.percentile(transactions.map((tx) => tx.effectiveFeePerVsize), config.MEMPOOL.RECOMMENDED_FEE_PERCENTILE),
       feeRange: feeStats.feeRange, //Common.getFeesInRange(transactions, rangeLength),
-      transactionIds: transactions.map((tx) => tx.txid),
+      transactionIds: transactionIds,
-      transactions: fitTransactions.map((tx) => Common.stripTransaction(tx)),
+      transactions: transactions.map((tx) => Common.stripTransaction(tx)),
     };
   }
+
+  private resetUids(): void {
+    this.uidMap.clear();
+    this.nextUid = 1;
+  }
+
+  private setUid(tx: TransactionExtended): number {
+    const uid = this.nextUid;
+    this.nextUid++;
+    this.uidMap.set(uid, tx.txid);
+    tx.uid = uid;
+    return uid;
+  }
+
+  private getUid(tx: TransactionExtended): number | void {
+    if (tx?.uid != null && this.uidMap.has(tx.uid)) {
+      return tx.uid;
+    }
+  }
+
+  private removeUids(uids: number[]): void {
+    for (const uid of uids) {
+      this.uidMap.delete(uid);
+    }
+  }
+
+  private convertResultTxids({ blocks, rates, clusters }: { blocks: number[][], rates: Map<number, number>, clusters: Map<number, number[]>})
+    : { blocks: string[][], rates: { [root: string]: number }, clusters: { [root: string]: string[] }} {
+    const convertedBlocks: string[][] = blocks.map(block => block.map(uid => {
+      return this.uidMap.get(uid) || '';
+    }));
+    const convertedRates = {};
+    for (const rateUid of rates.keys()) {
+      const rateTxid = this.uidMap.get(rateUid);
+      if (rateTxid) {
+        convertedRates[rateTxid] = rates.get(rateUid);
+      }
+    }
+    const convertedClusters = {};
+    for (const rootUid of clusters.keys()) {
+      const rootTxid = this.uidMap.get(rootUid);
+      if (rootTxid) {
+        const members = clusters.get(rootUid)?.map(uid => {
+          return this.uidMap.get(uid);
+        });
+        convertedClusters[rootTxid] = members;
+      }
+    }
+    return { blocks: convertedBlocks, rates: convertedRates, clusters: convertedClusters } as { blocks: string[][], rates: { [root: string]: number }, clusters: { [root: string]: string[] }};
+  }
 }
 
 export default new MempoolBlocks();

backend/src/api/mempool.ts

@@ -11,8 +11,6 @@ import bitcoinSecondClient from './bitcoin/bitcoin-second-client';
 import rbfCache from './rbf-cache';
 
 class Mempool {
-  private static WEBSOCKET_REFRESH_RATE_MS = 10000;
-  private static LAZY_DELETE_AFTER_SECONDS = 30;
   private inSync: boolean = false;
   private mempoolCacheDelta: number = -1;
   private mempoolCache: { [txId: string]: TransactionExtended } = {};
@@ -20,7 +18,7 @@ class Mempool {
                                                     maxmempool: 300000000, mempoolminfee: 0.00001000, minrelaytxfee: 0.00001000 };
   private mempoolChangedCallback: ((newMempool: {[txId: string]: TransactionExtended; }, newTransactions: TransactionExtended[],
     deletedTransactions: TransactionExtended[]) => void) | undefined;
-  private asyncMempoolChangedCallback: ((newMempool: {[txId: string]: TransactionExtended; }, newTransactions: TransactionExtended[],
+  private $asyncMempoolChangedCallback: ((newMempool: {[txId: string]: TransactionExtended; }, newTransactions: TransactionExtended[],
     deletedTransactions: TransactionExtended[]) => Promise<void>) | undefined;
 
   private txPerSecondArray: number[] = [];
@@ -35,6 +33,7 @@ class Mempool {
   private SAMPLE_TIME = 10000; // In ms
   private timer = new Date().getTime();
   private missingTxCount = 0;
+  private mainLoopTimeout: number = 120000;
 
   constructor() {
     setInterval(this.updateTxPerSecond.bind(this), 1000);
@@ -71,20 +70,20 @@ class Mempool {
 
   public setAsyncMempoolChangedCallback(fn: (newMempool: { [txId: string]: TransactionExtended; },
     newTransactions: TransactionExtended[], deletedTransactions: TransactionExtended[]) => Promise<void>) {
-    this.asyncMempoolChangedCallback = fn;
+    this.$asyncMempoolChangedCallback = fn;
   }
 
   public getMempool(): { [txid: string]: TransactionExtended } {
     return this.mempoolCache;
   }
 
-  public setMempool(mempoolData: { [txId: string]: TransactionExtended }) {
+  public async $setMempool(mempoolData: { [txId: string]: TransactionExtended }) {
     this.mempoolCache = mempoolData;
     if (this.mempoolChangedCallback) {
       this.mempoolChangedCallback(this.mempoolCache, [], []);
     }
-    if (this.asyncMempoolChangedCallback) {
+    if (this.$asyncMempoolChangedCallback) {
-      this.asyncMempoolChangedCallback(this.mempoolCache, [], []);
+      await this.$asyncMempoolChangedCallback(this.mempoolCache, [], []);
     }
   }
 
@@ -117,19 +116,23 @@ class Mempool {
     return txTimes;
   }
 
-  public async $updateMempool(): Promise<void> {
+  public async $updateMempool(transactions: string[]): Promise<void> {
     logger.debug(`Updating mempool...`);
+
+    // warn if this run stalls the main loop for more than 2 minutes
+    const timer = this.startTimer();
+
     const start = new Date().getTime();
     let hasChange: boolean = false;
     const currentMempoolSize = Object.keys(this.mempoolCache).length;
-    const transactions = await bitcoinApi.$getRawMempool();
+    this.updateTimerProgress(timer, 'got raw mempool');
     const diff = transactions.length - currentMempoolSize;
     const newTransactions: TransactionExtended[] = [];
 
     this.mempoolCacheDelta = Math.abs(diff);
 
     if (!this.inSync) {
-      loadingIndicators.setProgress('mempool', Object.keys(this.mempoolCache).length / transactions.length * 100);
+      loadingIndicators.setProgress('mempool', currentMempoolSize / transactions.length * 100);
     }
 
     // https://github.com/mempool/mempool/issues/3283
@@ -142,10 +145,12 @@ class Mempool {
       }
     };
 
+    let loggerTimer = new Date().getTime() / 1000;
     for (const txid of transactions) {
       if (!this.mempoolCache[txid]) {
         try {
           const transaction = await transactionUtils.$getTransactionExtended(txid);
+          this.updateTimerProgress(timer, 'fetched new transaction');
           this.mempoolCache[txid] = transaction;
           if (this.inSync) {
             this.txPerSecondArray.push(new Date().getTime());
@@ -163,9 +168,12 @@ class Mempool {
           logger.debug(`Error finding transaction '${txid}' in the mempool: ` + (e instanceof Error ? e.message : e));
         }
       }
-
+      const elapsedSeconds = Math.round((new Date().getTime() / 1000) - loggerTimer);
-      if ((new Date().getTime()) - start > Mempool.WEBSOCKET_REFRESH_RATE_MS) {
+      if (elapsedSeconds > 4) {
-        break;
+        const progress = (currentMempoolSize + newTransactions.length) / transactions.length * 100;
+        logger.debug(`Mempool is synchronizing. Processed ${newTransactions.length}/${diff} txs (${Math.round(progress)}%)`);
+        loadingIndicators.setProgress('mempool', progress);
+        loggerTimer = new Date().getTime() / 1000;
       }
     }
 
@@ -199,13 +207,15 @@ class Mempool {
       const transactionsObject = {};
       transactions.forEach((txId) => transactionsObject[txId] = true);
 
-      // Flag transactions for lazy deletion
+      // Delete evicted transactions from mempool
       for (const tx in this.mempoolCache) {
-        if (!transactionsObject[tx] && !this.mempoolCache[tx].deleteAfter) {
+        if (!transactionsObject[tx]) {
           deletedTransactions.push(this.mempoolCache[tx]);
-          this.mempoolCache[tx].deleteAfter = new Date().getTime() + Mempool.LAZY_DELETE_AFTER_SECONDS * 1000;
         }
       }
+      for (const tx of deletedTransactions) {
+        delete this.mempoolCache[tx.txid];
+      }
     }
 
     const newTransactionsStripped = newTransactions.map((tx) => Common.stripTransaction(tx));
@@ -222,22 +232,46 @@ class Mempool {
     if (this.mempoolChangedCallback && (hasChange || deletedTransactions.length)) {
       this.mempoolChangedCallback(this.mempoolCache, newTransactions, deletedTransactions);
     }
-    if (this.asyncMempoolChangedCallback && (hasChange || deletedTransactions.length)) {
+    if (this.$asyncMempoolChangedCallback && (hasChange || deletedTransactions.length)) {
-      await this.asyncMempoolChangedCallback(this.mempoolCache, newTransactions, deletedTransactions);
+      this.updateTimerProgress(timer, 'running async mempool callback');
+      await this.$asyncMempoolChangedCallback(this.mempoolCache, newTransactions, deletedTransactions);
+      this.updateTimerProgress(timer, 'completed async mempool callback');
     }
 
     const end = new Date().getTime();
     const time = end - start;
     logger.debug(`Mempool updated in ${time / 1000} seconds. New size: ${Object.keys(this.mempoolCache).length} (${diff > 0 ? '+' + diff : diff})`);
+
+    this.clearTimer(timer);
   }
 
-  public handleRbfTransactions(rbfTransactions: { [txid: string]: TransactionExtended; }) {
+  private startTimer() {
+    const state: any = {
+      start: Date.now(),
+      progress: 'begin $updateMempool',
+      timer: null,
+    };
+    state.timer = setTimeout(() => {
+      logger.err(`$updateMempool stalled at "${state.progress}"`);
+    }, this.mainLoopTimeout);
+    return state;
+  }
+
+  private updateTimerProgress(state, msg) {
+    state.progress = msg;
+  }
+
+  private clearTimer(state) {
+    if (state.timer) {
+      clearTimeout(state.timer);
+    }
+  }
+
+  public handleRbfTransactions(rbfTransactions: { [txid: string]: TransactionExtended[]; }): void {
     for (const rbfTransaction in rbfTransactions) {
-      if (this.mempoolCache[rbfTransaction]) {
+      if (this.mempoolCache[rbfTransaction] && rbfTransactions[rbfTransaction]?.length) {
         // Store replaced transactions
-        rbfCache.add(this.mempoolCache[rbfTransaction], rbfTransactions[rbfTransaction].txid);
+        rbfCache.add(rbfTransactions[rbfTransaction], this.mempoolCache[rbfTransaction]);
-        // Erase the replaced transactions from the local mempool
-        delete this.mempoolCache[rbfTransaction];
       }
     }
   }
@@ -255,17 +289,6 @@ class Mempool {
     }
   }
 
-  public deleteExpiredTransactions() {
-    const now = new Date().getTime();
-    for (const tx in this.mempoolCache) {
-      const lazyDeleteAt = this.mempoolCache[tx].deleteAfter;
-      if (lazyDeleteAt && lazyDeleteAt < now) {
-        delete this.mempoolCache[tx];
-        rbfCache.evict(tx);
-      }
-    }
-  }
-
   private $getMempoolInfo() {
     if (config.MEMPOOL.USE_SECOND_NODE_FOR_MINFEE) {
       return Promise.all([

backend/src/api/mining/mining.ts

@@ -452,7 +452,7 @@ class Mining {
       const elapsedSeconds = Math.max(1, Math.round((new Date().getTime() / 1000) - timer));
       if (elapsedSeconds > 5) {
         const progress = Math.round(totalBlockChecked / blocks.length * 100);
-        logger.info(`Indexing difficulty adjustment at block #${block.height} | Progress: ${progress}%`, logger.tags.mining);
+        logger.debug(`Indexing difficulty adjustment at block #${block.height} | Progress: ${progress}%`, logger.tags.mining);
         timer = new Date().getTime() / 1000;
       }
     }
@@ -558,8 +558,10 @@ class Mining {
       currentBlockHeight -= 10000;
     }
 
-    if (totalIndexed) {
+    if (totalIndexed > 0) {
-      logger.info(`Indexing missing coinstatsindex data completed`, logger.tags.mining);
+      logger.info(`Indexing missing coinstatsindex data completed. Indexed ${totalIndexed}`, logger.tags.mining);
+    } else {
+      logger.debug(`Indexing missing coinstatsindex data completed. Indexed 0.`, logger.tags.mining);
     }
   }
 

backend/src/api/rbf-cache.ts

@@ -1,65 +1,341 @@
-import { TransactionExtended } from "../mempool.interfaces";
+import logger from "../logger";
+import { TransactionExtended, TransactionStripped } from "../mempool.interfaces";
+import bitcoinApi from './bitcoin/bitcoin-api-factory';
+import { Common } from "./common";
+
+interface RbfTransaction extends TransactionStripped {
+  rbf?: boolean;
+  mined?: boolean;
+}
+
+interface RbfTree {
+  tx: RbfTransaction;
+  time: number;
+  interval?: number;
+  mined?: boolean;
+  fullRbf: boolean;
+  replaces: RbfTree[];
+}
 
 class RbfCache {
-  private replacedBy: { [txid: string]: string; } = {};
+  private replacedBy: Map<string, string> = new Map();
-  private replaces: { [txid: string]: string[] } = {};
+  private replaces: Map<string, string[]> = new Map();
-  private txs: { [txid: string]: TransactionExtended } = {};
+  private rbfTrees: Map<string, RbfTree> = new Map(); // sequences of consecutive replacements
-  private expiring: { [txid: string]: Date } = {};
+  private dirtyTrees: Set<string> = new Set();
+  private treeMap: Map<string, string> = new Map(); // map of txids to sequence ids
+  private txs: Map<string, TransactionExtended> = new Map();
+  private expiring: Map<string, number> = new Map();
 
   constructor() {
-    setInterval(this.cleanup.bind(this), 1000 * 60 * 60);
+    setInterval(this.cleanup.bind(this), 1000 * 60 * 10);
   }
 
-  public add(replacedTx: TransactionExtended, newTxId: string): void {
+  public add(replaced: TransactionExtended[], newTxExtended: TransactionExtended): void {
-    this.replacedBy[replacedTx.txid] = newTxId;
+    if (!newTxExtended || !replaced?.length) {
-    this.txs[replacedTx.txid] = replacedTx;
+      return;
-    if (!this.replaces[newTxId]) {
-      this.replaces[newTxId] = [];
     }
-    this.replaces[newTxId].push(replacedTx.txid);
+
+    const newTx = Common.stripTransaction(newTxExtended) as RbfTransaction;
+    const newTime = newTxExtended.firstSeen || Date.now();
+    newTx.rbf = newTxExtended.vin.some((v) => v.sequence < 0xfffffffe);
+    this.txs.set(newTx.txid, newTxExtended);
+
+    // maintain rbf trees
+    let fullRbf = false;
+    const replacedTrees: RbfTree[] = [];
+    for (const replacedTxExtended of replaced) {
+      const replacedTx = Common.stripTransaction(replacedTxExtended) as RbfTransaction;
+      replacedTx.rbf = replacedTxExtended.vin.some((v) => v.sequence < 0xfffffffe);
+      this.replacedBy.set(replacedTx.txid, newTx.txid);
+      if (this.treeMap.has(replacedTx.txid)) {
+        const treeId = this.treeMap.get(replacedTx.txid);
+        if (treeId) {
+          const tree = this.rbfTrees.get(treeId);
+          this.rbfTrees.delete(treeId);
+          if (tree) {
+            tree.interval = newTime - tree?.time;
+            replacedTrees.push(tree);
+            fullRbf = fullRbf || tree.fullRbf;
+          }
+        }
+      } else {
+        const replacedTime = replacedTxExtended.firstSeen || Date.now();
+        replacedTrees.push({
+          tx: replacedTx,
+          time: replacedTime,
+          interval: newTime - replacedTime,
+          fullRbf: !replacedTx.rbf,
+          replaces: [],
+        });
+        fullRbf = fullRbf || !replacedTx.rbf;
+        this.txs.set(replacedTx.txid, replacedTxExtended);
+      }
+    }
+    const treeId = replacedTrees[0].tx.txid;
+    const newTree = {
+      tx: newTx,
+      time: newTxExtended.firstSeen || Date.now(),
+      fullRbf,
+      replaces: replacedTrees
+    };
+    this.rbfTrees.set(treeId, newTree);
+    this.updateTreeMap(treeId, newTree);
+    this.replaces.set(newTx.txid, replacedTrees.map(tree => tree.tx.txid));
+    this.dirtyTrees.add(treeId);
   }
 
   public getReplacedBy(txId: string): string | undefined {
-    return this.replacedBy[txId];
+    return this.replacedBy.get(txId);
   }
 
   public getReplaces(txId: string): string[] | undefined {
-    return this.replaces[txId];
+    return this.replaces.get(txId);
   }
 
   public getTx(txId: string): TransactionExtended | undefined {
-    return this.txs[txId];
+    return this.txs.get(txId);
+  }
+
+  public getRbfTree(txId: string): RbfTree | void {
+    return this.rbfTrees.get(this.treeMap.get(txId) || '');
+  }
+
+  // get a paginated list of RbfTrees
+  // ordered by most recent replacement time
+  public getRbfTrees(onlyFullRbf: boolean, after?: string): RbfTree[] {
+    const limit = 25;
+    const trees: RbfTree[] = [];
+    const used = new Set<string>();
+    const replacements: string[][] = Array.from(this.replacedBy).reverse();
+    const afterTree = after ? this.treeMap.get(after) : null;
+    let ready = !afterTree;
+    for (let i = 0; i < replacements.length && trees.length <= limit - 1; i++) {
+      const txid = replacements[i][1];
+      const treeId = this.treeMap.get(txid) || '';
+      if (treeId === afterTree) {
+        ready = true;
+      } else if (ready) {
+        if (!used.has(treeId)) {
+          const tree = this.rbfTrees.get(treeId);
+          used.add(treeId);
+          if (tree && (!onlyFullRbf || tree.fullRbf)) {
+            trees.push(tree);
+          }
+        }
+      }
+    }
+    return trees;
+  }
+
+  // get map of rbf trees that have been updated since the last call
+  public getRbfChanges(): { trees: {[id: string]: RbfTree }, map: { [txid: string]: string }} {
+    const changes: { trees: {[id: string]: RbfTree }, map: { [txid: string]: string }} = {
+      trees: {},
+      map: {},
+    };
+    this.dirtyTrees.forEach(id => {
+      const tree = this.rbfTrees.get(id);
+      if (tree) {
+        changes.trees[id] = tree;
+        this.getTransactionsInTree(tree).forEach(tx => {
+          changes.map[tx.txid] = id;
+        });
+      }
+    });
+    this.dirtyTrees = new Set();
+    return changes;
+  }
+
+  public mined(txid): void {
+    if (!this.txs.has(txid)) {
+      return;
+    }
+    const treeId = this.treeMap.get(txid);
+    if (treeId && this.rbfTrees.has(treeId)) {
+      const tree = this.rbfTrees.get(treeId);
+      if (tree) {
+        this.setTreeMined(tree, txid);
+        tree.mined = true;
+        this.dirtyTrees.add(treeId);
+      }
+    }
+    this.evict(txid);
   }
 
   // flag a transaction as removed from the mempool
-  public evict(txid): void {
+  public evict(txid: string, fast: boolean = false): void {
-    this.expiring[txid] = new Date(Date.now() + 1000 * 86400); // 24 hours
+    if (this.txs.has(txid) && (fast || !this.expiring.has(txid))) {
+      this.expiring.set(txid, fast ? Date.now() + (1000 * 60 * 10) : Date.now() + (1000 * 86400)); // 24 hours
+    }
   }
 
   private cleanup(): void {
-    const currentDate = new Date();
+    const now = Date.now();
-    for (const txid in this.expiring) {
+    for (const txid of this.expiring.keys()) {
-      if (this.expiring[txid] < currentDate) {
+      if ((this.expiring.get(txid) || 0) < now) {
-        delete this.expiring[txid];
+        this.expiring.delete(txid);
         this.remove(txid);
       }
     }
+    logger.debug(`rbf cache contains ${this.txs.size} txs, ${this.expiring.size} due to expire`);
   }
 
   // remove a transaction & all previous versions from the cache
   private remove(txid): void {
-    // don't remove a transaction while a newer version remains in the mempool
+    // don't remove a transaction if a newer version remains in the mempool
-    if (this.replaces[txid] && !this.replacedBy[txid]) {
+    if (!this.replacedBy.has(txid)) {
-      const replaces = this.replaces[txid];
+      const replaces = this.replaces.get(txid);
-      delete this.replaces[txid];
+      this.replaces.delete(txid);
-      for (const tx of replaces) {
+      this.treeMap.delete(txid);
+      this.txs.delete(txid);
+      this.expiring.delete(txid);
+      for (const tx of (replaces || [])) {
         // recursively remove prior versions from the cache
-        delete this.replacedBy[tx];
+        this.replacedBy.delete(tx);
-        delete this.txs[tx];
+        // if this is the id of a tree, remove that too
+        if (this.treeMap.get(tx) === tx) {
+          this.rbfTrees.delete(tx);
+        }
         this.remove(tx);
       }
     }
   }
+
+  private updateTreeMap(newId: string, tree: RbfTree): void {
+    this.treeMap.set(tree.tx.txid, newId);
+    tree.replaces.forEach(subtree => {
+      this.updateTreeMap(newId, subtree);
+    });
+  }
+
+  private getTransactionsInTree(tree: RbfTree, txs: RbfTransaction[] = []): RbfTransaction[] {
+    txs.push(tree.tx);
+    tree.replaces.forEach(subtree => {
+      this.getTransactionsInTree(subtree, txs);
+    });
+    return txs;
+  }
+
+  private setTreeMined(tree: RbfTree, txid: string): void {
+    if (tree.tx.txid === txid) {
+      tree.tx.mined = true;
+    } else {
+      tree.replaces.forEach(subtree => {
+        this.setTreeMined(subtree, txid);
+      });
+    }
+  }
+
+  public dump(): any {
+    const trees = Array.from(this.rbfTrees.values()).map((tree: RbfTree) => { return this.exportTree(tree); });
+
+    return {
+      txs: Array.from(this.txs.entries()),
+      trees,
+      expiring: Array.from(this.expiring.entries()),
+    };
+  }
+
+  public async load({ txs, trees, expiring }): Promise<void> {
+    txs.forEach(txEntry => {
+      this.txs.set(txEntry[0], txEntry[1]);
+    });
+    for (const deflatedTree of trees) {
+      await this.importTree(deflatedTree.root, deflatedTree.root, deflatedTree, this.txs);
+    }
+    expiring.forEach(expiringEntry => {
+      if (this.txs.has(expiringEntry[0])) {
+        this.expiring.set(expiringEntry[0], new Date(expiringEntry[1]).getTime());
+      }
+    });
+    this.cleanup();
+  }
+
+  exportTree(tree: RbfTree, deflated: any = null) {
+    if (!deflated) {
+      deflated = {
+        root: tree.tx.txid,
+      };
+    }
+    deflated[tree.tx.txid] = {
+      tx: tree.tx.txid,
+      txMined: tree.tx.mined,
+      time: tree.time,
+      interval: tree.interval,
+      mined: tree.mined,
+      fullRbf: tree.fullRbf,
+      replaces: tree.replaces.map(child => child.tx.txid),
+    };
+    tree.replaces.forEach(child => {
+      this.exportTree(child, deflated);
+    });
+    return deflated;
+  }
+
+  async importTree(root, txid, deflated, txs: Map<string, TransactionExtended>, mined: boolean = false): Promise<RbfTree | void> {
+    const treeInfo = deflated[txid];
+    const replaces: RbfTree[] = [];
+
+    // check if any transactions in this tree have already been confirmed
+    mined = mined || treeInfo.mined;
+    let exists = mined;
+    if (!mined) {
+      try {
+        const apiTx = await bitcoinApi.$getRawTransaction(txid);
+        if (apiTx) {
+          exists = true;
+        }
+        if (apiTx?.status?.confirmed) {
+          mined = true;
+          treeInfo.txMined = true;
+          this.evict(txid, true);
+        }
+      } catch (e) {
+        // most transactions do not exist
+      }
+    }
+
+    // if the root tx is not in the mempool or the blockchain
+    // evict this tree as soon as possible
+    if (root === txid && !exists) {
+      this.evict(txid, true);
+    }
+
+    // recursively reconstruct child trees
+    for (const childId of treeInfo.replaces) {
+      const replaced = await this.importTree(root, childId, deflated, txs, mined);
+      if (replaced) {
+        this.replacedBy.set(replaced.tx.txid, txid);
+        replaces.push(replaced);
+        if (replaced.mined) {
+          mined = true;
+        }
+      }
+    }
+    this.replaces.set(txid, replaces.map(t => t.tx.txid));
+
+    const tx = txs.get(txid);
+    if (!tx) {
+      return;
+    }
+    const strippedTx = Common.stripTransaction(tx) as RbfTransaction;
+    strippedTx.rbf = tx.vin.some((v) => v.sequence < 0xfffffffe);
+    strippedTx.mined = treeInfo.txMined;
+    const tree = {
+      tx: strippedTx,
+      time: treeInfo.time,
+      interval: treeInfo.interval,
+      mined: mined,
+      fullRbf: treeInfo.fullRbf,
+      replaces,
+    };
+    this.treeMap.set(txid, root);
+    if (root === txid) {
+      this.rbfTrees.set(root, tree);
+      this.dirtyTrees.add(root);
+    }
+    return tree;
+  }
 }
 
 export default new RbfCache();

backend/src/api/tx-selection-worker.ts

@@ -1,11 +1,10 @@
 import config from '../config';
 import logger from '../logger';
-import { ThreadTransaction, MempoolBlockWithTransactions, AuditTransaction } from '../mempool.interfaces';
+import { CompactThreadTransaction, AuditTransaction } from '../mempool.interfaces';
 import { PairingHeap } from '../utils/pairing-heap';
-import { Common } from './common';
 import { parentPort } from 'worker_threads';
 
-let mempool: { [txid: string]: ThreadTransaction } = {};
+let mempool: Map<number, CompactThreadTransaction> = new Map();
 
 if (parentPort) {
   parentPort.on('message', (params) => {
@@ -13,18 +12,18 @@ if (parentPort) {
       mempool = params.mempool;
     } else if (params.type === 'update') {
       params.added.forEach(tx => {
-        mempool[tx.txid] = tx;
+        mempool.set(tx.uid, tx);
       });
-      params.removed.forEach(txid => {
+      params.removed.forEach(uid => {
-        delete mempool[txid];
+        mempool.delete(uid);
       });
     }
     
-    const { blocks, clusters } = makeBlockTemplates(mempool);
+    const { blocks, rates, clusters } = makeBlockTemplates(mempool);
 
     // return the result to main thread.
     if (parentPort) {
-     parentPort.postMessage({ blocks, clusters });
+      parentPort.postMessage({ blocks, rates, clusters });
     }
   });
 }
@@ -33,26 +32,25 @@ if (parentPort) {
 * Build projected mempool blocks using an approximation of the transaction selection algorithm from Bitcoin Core
 * (see BlockAssembler in https://github.com/bitcoin/bitcoin/blob/master/src/node/miner.cpp)
 */
-function makeBlockTemplates(mempool: { [txid: string]: ThreadTransaction })
+function makeBlockTemplates(mempool: Map<number, CompactThreadTransaction>)
-  : { blocks: ThreadTransaction[][], clusters: { [root: string]: string[] } } {
+  : { blocks: number[][], rates: Map<number, number>, clusters: Map<number, number[]> } {
   const start = Date.now();
-  const auditPool: { [txid: string]: AuditTransaction } = {};
+  const auditPool: Map<number, AuditTransaction> = new Map();
   const mempoolArray: AuditTransaction[] = [];
-  const restOfArray: ThreadTransaction[] = [];
+  const cpfpClusters: Map<number, number[]> = new Map();
-  const cpfpClusters: { [root: string]: string[] } = {};
   
-  // grab the top feerate txs up to maxWeight
+  mempool.forEach(tx => {
-  Object.values(mempool).sort((a, b) => b.feePerVsize - a.feePerVsize).forEach(tx => {
+    tx.dirty = false;
     // initializing everything up front helps V8 optimize property access later
-    auditPool[tx.txid] = {
+    auditPool.set(tx.uid, {
-      txid: tx.txid,
+      uid: tx.uid,
       fee: tx.fee,
       weight: tx.weight,
       feePerVsize: tx.feePerVsize,
       effectiveFeePerVsize: tx.feePerVsize,
-      vin: tx.vin,
+      inputs: tx.inputs || [],
       relativesSet: false,
-      ancestorMap: new Map<string, AuditTransaction>(),
+      ancestorMap: new Map<number, AuditTransaction>(),
       children: new Set<AuditTransaction>(),
       ancestorFee: 0,
       ancestorWeight: 0,
@@ -60,8 +58,8 @@ function makeBlockTemplates(mempool: { [txid: string]: ThreadTransaction })
       used: false,
       modified: false,
       modifiedNode: null,
-    };
+    });
-    mempoolArray.push(auditPool[tx.txid]);
+    mempoolArray.push(auditPool.get(tx.uid) as AuditTransaction);
   });
 
   // Build relatives graph & calculate ancestor scores
@@ -72,15 +70,28 @@ function makeBlockTemplates(mempool: { [txid: string]: ThreadTransaction })
   }
 
   // Sort by descending ancestor score
-  mempoolArray.sort((a, b) => (b.score || 0) - (a.score || 0));
+  mempoolArray.sort((a, b) => {
+    if (b.score === a.score) {
+      // tie-break by uid for stability
+      return a.uid < b.uid ? -1 : 1;
+    } else {
+      return (b.score || 0) - (a.score || 0);
+    }
+  });
 
   // Build blocks by greedily choosing the highest feerate package
   // (i.e. the package rooted in the transaction with the best ancestor score)
-  const blocks: ThreadTransaction[][] = [];
+  const blocks: number[][] = [];
   let blockWeight = 4000;
-  let blockSize = 0;
   let transactions: AuditTransaction[] = [];
-  const modified: PairingHeap<AuditTransaction> = new PairingHeap((a, b): boolean => (a.score || 0) > (b.score || 0));
+  const modified: PairingHeap<AuditTransaction> = new PairingHeap((a, b): boolean => {
+    if (a.score === b.score) {
+      // tie-break by uid for stability
+      return a.uid > b.uid;
+    } else {
+      return (a.score || 0) > (b.score || 0);
+    }
+  });
   let overflow: AuditTransaction[] = [];
   let failures = 0;
   let top = 0;
@@ -107,30 +118,36 @@ function makeBlockTemplates(mempool: { [txid: string]: ThreadTransaction })
 
     if (nextTx && !nextTx?.used) {
       // Check if the package fits into this block
-      if (blockWeight + nextTx.ancestorWeight < config.MEMPOOL.BLOCK_WEIGHT_UNITS) {
+      if (blocks.length >= 7 || (blockWeight + nextTx.ancestorWeight < config.MEMPOOL.BLOCK_WEIGHT_UNITS)) {
         const ancestors: AuditTransaction[] = Array.from(nextTx.ancestorMap.values());
         // sort ancestors by dependency graph (equivalent to sorting by ascending ancestor count)
         const sortedTxSet = [...ancestors.sort((a, b) => { return (a.ancestorMap.size || 0) - (b.ancestorMap.size || 0); }), nextTx];
         let isCluster = false;
         if (sortedTxSet.length > 1) {
-          cpfpClusters[nextTx.txid] = sortedTxSet.map(tx => tx.txid);
+          cpfpClusters.set(nextTx.uid, sortedTxSet.map(tx => tx.uid));
           isCluster = true;
         }
         const effectiveFeeRate = nextTx.ancestorFee / (nextTx.ancestorWeight / 4);
         const used: AuditTransaction[] = [];
         while (sortedTxSet.length) {
           const ancestor = sortedTxSet.pop();
-          const mempoolTx = mempool[ancestor.txid];
+          const mempoolTx = mempool.get(ancestor.uid);
+          if (!mempoolTx) {
+            continue;
+          }
           ancestor.used = true;
-          ancestor.usedBy = nextTx.txid;
+          ancestor.usedBy = nextTx.uid;
           // update original copy of this tx with effective fee rate & relatives data
-          mempoolTx.effectiveFeePerVsize = effectiveFeeRate;
+          if (mempoolTx.effectiveFeePerVsize !== effectiveFeeRate) {
-          if (isCluster) {
+            mempoolTx.effectiveFeePerVsize = effectiveFeeRate;
-            mempoolTx.cpfpRoot = nextTx.txid;
+            mempoolTx.dirty = true;
+          }
+          if (mempoolTx.cpfpRoot !== nextTx.uid) {
+            mempoolTx.cpfpRoot = isCluster ? nextTx.uid : null;
+            mempoolTx.dirty;
           }
           mempoolTx.cpfpChecked = true;
           transactions.push(ancestor);
-          blockSize += ancestor.size;
           blockWeight += ancestor.weight;
           used.push(ancestor);
         }
@@ -156,11 +173,10 @@ function makeBlockTemplates(mempool: { [txid: string]: ThreadTransaction })
     if ((exceededPackageTries || queueEmpty) && blocks.length < 7) {
       // construct this block
       if (transactions.length) {
-        blocks.push(transactions.map(t => mempool[t.txid]));
+        blocks.push(transactions.map(t => t.uid));
       }
       // reset for the next block
       transactions = [];
-      blockSize = 0;
       blockWeight = 4000;
 
       // 'overflow' packages didn't fit in this block, but are valid candidates for the next
@@ -175,50 +191,38 @@ function makeBlockTemplates(mempool: { [txid: string]: ThreadTransaction })
       overflow = [];
     }
   }
-  // pack any leftover transactions into the last block
+
-  for (const tx of overflow) {
+  if (overflow.length > 0) {
-    if (!tx || tx?.used) {
+    logger.warn('GBT overflow list unexpectedly non-empty after final block constructed');
-      continue;
-    }
-    blockWeight += tx.weight;
-    const mempoolTx = mempool[tx.txid];
-    // update original copy of this tx with effective fee rate & relatives data
-    mempoolTx.effectiveFeePerVsize = tx.score;
-    if (tx.ancestorMap.size > 0) {
-      cpfpClusters[tx.txid] = Array.from(tx.ancestorMap?.values()).map(a => a.txid);
-      mempoolTx.cpfpRoot = tx.txid;
-    }
-    mempoolTx.cpfpChecked = true;
-    transactions.push(tx);
-    tx.used = true;
   }
-  const blockTransactions = transactions.map(t => mempool[t.txid]);
+  // add the final unbounded block if it contains any transactions
-  restOfArray.forEach(tx => {
+  if (transactions.length > 0) {
-    blockWeight += tx.weight;
+    blocks.push(transactions.map(t => t.uid));
-    tx.effectiveFeePerVsize = tx.feePerVsize;
+  }
-    tx.cpfpChecked = false;
+
-    blockTransactions.push(tx);
+  // get map of dirty transactions
-  });
+  const rates = new Map<number, number>();
-  if (blockTransactions.length) {
+  for (const tx of mempool.values()) {
-    blocks.push(blockTransactions);
+    if (tx?.dirty) {
+      rates.set(tx.uid, tx.effectiveFeePerVsize || tx.feePerVsize);
+    }
   }
-  transactions = [];
 
   const end = Date.now();
   const time = end - start;
   logger.debug('Mempool templates calculated in ' + time / 1000 + ' seconds');
 
-  return { blocks, clusters: cpfpClusters };
+  return { blocks, rates, clusters: cpfpClusters };
 }
 
 // traverse in-mempool ancestors
 // recursion unavoidable, but should be limited to depth < 25 by mempool policy
 function setRelatives(
   tx: AuditTransaction,
-  mempool: { [txid: string]: AuditTransaction },
+  mempool: Map<number, AuditTransaction>,
 ): void {
-  for (const parent of tx.vin) {
+  for (const parent of tx.inputs) {
-    const parentTx = mempool[parent];
+    const parentTx = mempool.get(parent);
     if (parentTx && !tx.ancestorMap?.has(parent)) {
       tx.ancestorMap.set(parent, parentTx);
       parentTx.children.add(tx);
@@ -227,7 +231,7 @@ function setRelatives(
         setRelatives(parentTx, mempool);
       }
       parentTx.ancestorMap.forEach((ancestor) => {
-        tx.ancestorMap.set(ancestor.txid, ancestor);
+        tx.ancestorMap.set(ancestor.uid, ancestor);
       });
     }
   };
@@ -245,7 +249,7 @@ function setRelatives(
 // avoids recursion to limit call stack depth
 function updateDescendants(
   rootTx: AuditTransaction,
-  mempool: { [txid: string]: AuditTransaction },
+  mempool: Map<number, AuditTransaction>,
   modified: PairingHeap<AuditTransaction>,
 ): void {
   const descendantSet: Set<AuditTransaction> = new Set();
@@ -261,9 +265,9 @@ function updateDescendants(
   });
   while (descendants.length) {
     descendantTx = descendants.pop();
-    if (descendantTx && descendantTx.ancestorMap && descendantTx.ancestorMap.has(rootTx.txid)) {
+    if (descendantTx && descendantTx.ancestorMap && descendantTx.ancestorMap.has(rootTx.uid)) {
       // remove tx as ancestor
-      descendantTx.ancestorMap.delete(rootTx.txid);
+      descendantTx.ancestorMap.delete(rootTx.uid);
       descendantTx.ancestorFee -= rootTx.fee;
       descendantTx.ancestorWeight -= rootTx.weight;
       tmpScore = descendantTx.score;

backend/src/api/websocket-handler.ts

@@ -26,6 +26,13 @@ class WebsocketHandler {
   private wss: WebSocket.Server | undefined;
   private extraInitProperties = {};
 
+  private numClients = 0;
+  private numConnected = 0;
+  private numDisconnected = 0;
+
+  private initData: { [key: string]: string } = {};
+  private serializedInitData: string = '{}';
+
   constructor() { }
 
   setWebsocketServer(wss: WebSocket.Server) {
@@ -34,6 +41,41 @@ class WebsocketHandler {
 
   setExtraInitProperties(property: string, value: any) {
     this.extraInitProperties[property] = value;
+    this.setInitDataFields(this.extraInitProperties);
+  }
+
+  private setInitDataFields(data: { [property: string]: any }): void {
+    for (const property of Object.keys(data)) {
+      if (data[property] != null) {
+        this.initData[property] = JSON.stringify(data[property]);
+      } else {
+        delete this.initData[property];
+      }
+    }
+    this.serializedInitData = '{'
+      + Object.keys(this.initData).map(key => `"${key}": ${this.initData[key]}`).join(', ')
+      + '}';
+  }
+
+  private updateInitData(): void {
+    const _blocks = blocks.getBlocks().slice(-config.MEMPOOL.INITIAL_BLOCKS_AMOUNT);
+    const da = difficultyAdjustment.getDifficultyAdjustment();
+    this.setInitDataFields({
+      'mempoolInfo': memPool.getMempoolInfo(),
+      'vBytesPerSecond': memPool.getVBytesPerSecond(),
+      'blocks': _blocks,
+      'conversions': priceUpdater.getLatestPrices(),
+      'mempool-blocks': mempoolBlocks.getMempoolBlocks(),
+      'transactions': memPool.getLatestTransactions(),
+      'backendInfo': backendInfo.getBackendInfo(),
+      'loadingIndicators': loadingIndicators.getLoadingIndicators(),
+      'da': da?.previousTime ? da : undefined,
+      'fees': feeApi.getRecommendedFee(),
+    });
+  }
+
+  public getSerializedInitData(): string {
+    return this.serializedInitData;
   }
 
   setupConnectionHandling() {
@@ -42,7 +84,11 @@ class WebsocketHandler {
     }
 
     this.wss.on('connection', (client: WebSocket) => {
+      this.numConnected++;
       client.on('error', logger.info);
+      client.on('close', () => {
+        this.numDisconnected++;
+      });
       client.on('message', async (message: string) => {
         try {
           const parsedMessage: WebsocketResponse = JSON.parse(message);
@@ -58,9 +104,10 @@ class WebsocketHandler {
           if (parsedMessage && parsedMessage['track-tx']) {
             if (/^[a-fA-F0-9]{64}$/.test(parsedMessage['track-tx'])) {
               client['track-tx'] = parsedMessage['track-tx'];
+              const trackTxid = client['track-tx'];
               // Client is telling the transaction wasn't found
               if (parsedMessage['watch-mempool']) {
-                const rbfCacheTxid = rbfCache.getReplacedBy(client['track-tx']);
+                const rbfCacheTxid = rbfCache.getReplacedBy(trackTxid);
                 if (rbfCacheTxid) {
                   response['txReplaced'] = {
                     txid: rbfCacheTxid,
@@ -68,7 +115,7 @@ class WebsocketHandler {
                   client['track-tx'] = null;
                 } else {
                   // It might have appeared before we had the time to start watching for it
-                  const tx = memPool.getMempool()[client['track-tx']];
+                  const tx = memPool.getMempool()[trackTxid];
                   if (tx) {
                     if (config.MEMPOOL.BACKEND === 'esplora') {
                       response['tx'] = tx;
@@ -92,6 +139,13 @@ class WebsocketHandler {
                   }
                 }
               }
+              const tx = memPool.getMempool()[trackTxid];
+              if (tx && tx.position) {
+                response['txPosition'] = {
+                  txid: trackTxid,
+                  position: tx.position,
+                };
+              }
             } else {
               client['track-tx'] = null;
             }
@@ -132,12 +186,22 @@ class WebsocketHandler {
             }
           }
 
+          if (parsedMessage && parsedMessage['track-rbf'] !== undefined) {
+            if (['all', 'fullRbf'].includes(parsedMessage['track-rbf'])) {
+              client['track-rbf'] = parsedMessage['track-rbf'];
+            } else {
+              client['track-rbf'] = false;
+            }
+          }
+
           if (parsedMessage.action === 'init') {
-            const _blocks = blocks.getBlocks().slice(-config.MEMPOOL.INITIAL_BLOCKS_AMOUNT);
+            if (!this.initData['blocks']?.length || !this.initData['da']) {
-            if (!_blocks) {
+              this.updateInitData();
+            }
+            if (!this.initData['blocks']?.length) {
               return;
             }
-            client.send(JSON.stringify(this.getInitData(_blocks)));
+            client.send(this.serializedInitData);
           }
 
           if (parsedMessage.action === 'ping') {
@@ -186,11 +250,14 @@ class WebsocketHandler {
       throw new Error('WebSocket.Server is not set');
     }
 
+    this.setInitDataFields({ 'loadingIndicators': indicators });
+
+    const response = JSON.stringify({ loadingIndicators: indicators });
     this.wss.clients.forEach((client) => {
       if (client.readyState !== WebSocket.OPEN) {
         return;
       }
-      client.send(JSON.stringify({ loadingIndicators: indicators }));
+      client.send(response);
     });
   }
 
@@ -199,39 +266,28 @@ class WebsocketHandler {
       throw new Error('WebSocket.Server is not set');
     }
 
+    this.setInitDataFields({ 'conversions': conversionRates });
+
+    const response = JSON.stringify({ conversions: conversionRates });
     this.wss.clients.forEach((client) => {
       if (client.readyState !== WebSocket.OPEN) {
         return;
       }
-      client.send(JSON.stringify({ conversions: conversionRates }));
+      client.send(response);
     });
   }
 
-  getInitData(_blocks?: BlockExtended[]) {
-    if (!_blocks) {
-      _blocks = blocks.getBlocks().slice(-config.MEMPOOL.INITIAL_BLOCKS_AMOUNT);
-    }
-    const da = difficultyAdjustment.getDifficultyAdjustment();
-    return {
-      'mempoolInfo': memPool.getMempoolInfo(),
-      'vBytesPerSecond': memPool.getVBytesPerSecond(),
-      'blocks': _blocks,
-      'conversions': priceUpdater.getLatestPrices(),
-      'mempool-blocks': mempoolBlocks.getMempoolBlocks(),
-      'transactions': memPool.getLatestTransactions(),
-      'backendInfo': backendInfo.getBackendInfo(),
-      'loadingIndicators': loadingIndicators.getLoadingIndicators(),
-      'da': da?.previousTime ? da : undefined,
-      'fees': feeApi.getRecommendedFee(),
-      ...this.extraInitProperties
-    };
-  }
-
   handleNewStatistic(stats: OptimizedStatistic) {
     if (!this.wss) {
       throw new Error('WebSocket.Server is not set');
     }
 
+    this.printLogs();
+
+    const response = JSON.stringify({
+      'live-2h-chart': stats
+    });
+
     this.wss.clients.forEach((client) => {
       if (client.readyState !== WebSocket.OPEN) {
         return;
@@ -241,20 +297,20 @@ class WebsocketHandler {
         return;
       }
 
-      client.send(JSON.stringify({
+      client.send(response);
-        'live-2h-chart': stats
-      }));
     });
   }
 
-  async handleMempoolChange(newMempool: { [txid: string]: TransactionExtended },
+  async $handleMempoolChange(newMempool: { [txid: string]: TransactionExtended },
     newTransactions: TransactionExtended[], deletedTransactions: TransactionExtended[]): Promise<void> {
     if (!this.wss) {
       throw new Error('WebSocket.Server is not set');
     }
 
+    this.printLogs();
+
     if (config.MEMPOOL.ADVANCED_GBT_MEMPOOL) {
-      await mempoolBlocks.updateBlockTemplates(newMempool, newTransactions, deletedTransactions.map(tx => tx.txid), true);
+      await mempoolBlocks.$updateBlockTemplates(newMempool, newTransactions, deletedTransactions, true);
     } else {
       mempoolBlocks.updateMempoolBlocks(newMempool, true);
     }
@@ -266,8 +322,55 @@ class WebsocketHandler {
     const rbfTransactions = Common.findRbfTransactions(newTransactions, deletedTransactions);
     const da = difficultyAdjustment.getDifficultyAdjustment();
     memPool.handleRbfTransactions(rbfTransactions);
+    const rbfChanges = rbfCache.getRbfChanges();
+    let rbfReplacements;
+    let fullRbfReplacements;
+    if (Object.keys(rbfChanges.trees).length) {
+      rbfReplacements = rbfCache.getRbfTrees(false);
+      fullRbfReplacements = rbfCache.getRbfTrees(true);
+    }
+    for (const deletedTx of deletedTransactions) {
+      rbfCache.evict(deletedTx.txid);
+    }
     const recommendedFees = feeApi.getRecommendedFee();
 
+    // update init data
+    this.updateInitData();
+
+    // cache serialized objects to avoid stringify-ing the same thing for every client
+    const responseCache = { ...this.initData };
+    function getCachedResponse(key: string,  data): string {
+      if (!responseCache[key]) {
+        responseCache[key] = JSON.stringify(data);
+      }
+      return responseCache[key];
+    }
+
+    // pre-compute new tracked outspends
+    const outspendCache: { [txid: string]: { [vout: number]: { vin: number, txid: string } } } = {};
+    const trackedTxs = new Set<string>();
+    this.wss.clients.forEach((client) => {
+      if (client['track-tx']) {
+        trackedTxs.add(client['track-tx']);
+      }
+    });
+    if (trackedTxs.size > 0) {
+      for (const tx of newTransactions) {
+        for (let i = 0; i < tx.vin.length; i++) {
+          const vin = tx.vin[i];
+          if (trackedTxs.has(vin.txid)) {
+            if (!outspendCache[vin.txid]) {
+              outspendCache[vin.txid] = { [vin.vout]: { vin: i, txid: tx.txid }};
+            } else {
+              outspendCache[vin.txid][vin.vout] = { vin: i, txid: tx.txid };
+            }
+          }
+        }
+      }
+    }
+
+    const latestTransactions = newTransactions.slice(0, 6).map((tx) => Common.stripTransaction(tx));
+
     this.wss.clients.forEach(async (client) => {
       if (client.readyState !== WebSocket.OPEN) {
         return;
@@ -276,17 +379,17 @@ class WebsocketHandler {
       const response = {};
 
       if (client['want-stats']) {
-        response['mempoolInfo'] = mempoolInfo;
+        response['mempoolInfo'] = getCachedResponse('mempoolInfo', mempoolInfo);
-        response['vBytesPerSecond'] = vBytesPerSecond;
+        response['vBytesPerSecond'] = getCachedResponse('vBytesPerSecond', vBytesPerSecond);
-        response['transactions'] = newTransactions.slice(0, 6).map((tx) => Common.stripTransaction(tx));
+        response['transactions'] = getCachedResponse('transactions', latestTransactions);
         if (da?.previousTime) {
-          response['da'] = da;
+          response['da'] = getCachedResponse('da', da);
         }
-        response['fees'] = recommendedFees;
+        response['fees'] = getCachedResponse('fees', recommendedFees);
       }
 
       if (client['want-mempool-blocks']) {
-        response['mempool-blocks'] = mBlocks;
+        response['mempool-blocks'] = getCachedResponse('mempool-blocks', mBlocks);
       }
 
       if (client['track-mempool-tx']) {
@@ -295,12 +398,12 @@ class WebsocketHandler {
           if (config.MEMPOOL.BACKEND !== 'esplora') {
             try {
               const fullTx = await transactionUtils.$getTransactionExtended(tx.txid, true);
-              response['tx'] = fullTx;
+              response['tx'] = JSON.stringify(fullTx);
             } catch (e) {
               logger.debug('Error finding transaction in mempool: ' + (e instanceof Error ? e.message : e));
             }
           } else {
-            response['tx'] = tx;
+            response['tx'] = JSON.stringify(tx);
           }
           client['track-mempool-tx'] = null;
         }
@@ -340,7 +443,7 @@ class WebsocketHandler {
         }
 
         if (foundTransactions.length) {
-          response['address-transactions'] = foundTransactions;
+          response['address-transactions'] = JSON.stringify(foundTransactions);
         }
       }
 
@@ -369,49 +472,60 @@ class WebsocketHandler {
         });
 
         if (foundTransactions.length) {
-          response['address-transactions'] = foundTransactions;
+          response['address-transactions'] = JSON.stringify(foundTransactions);
         }
       }
 
       if (client['track-tx']) {
-        const outspends: object = {};
+        const trackTxid = client['track-tx'];
-        newTransactions.forEach((tx) => tx.vin.forEach((vin, i) => {
+        const outspends = outspendCache[trackTxid];
-          if (vin.txid === client['track-tx']) {
-            outspends[vin.vout] = {
-              vin: i,
-              txid: tx.txid,
-            };
-          }
-        }));
 
-        if (Object.keys(outspends).length) {
+        if (outspends && Object.keys(outspends).length) {
-          response['utxoSpent'] = outspends;
+          response['utxoSpent'] = JSON.stringify(outspends);
         }
 
-        if (rbfTransactions[client['track-tx']]) {
+        const rbfReplacedBy = rbfCache.getReplacedBy(client['track-tx']);
-          for (const rbfTransaction in rbfTransactions) {
+        if (rbfReplacedBy) {
-            if (client['track-tx'] === rbfTransaction) {
+          response['rbfTransaction'] = JSON.stringify({
-              response['rbfTransaction'] = {
+            txid: rbfReplacedBy,
-                txid: rbfTransactions[rbfTransaction].txid,
+          })
-              };
+        }
-              break;
+
-            }
+        const rbfChange = rbfChanges.map[client['track-tx']];
-          }
+        if (rbfChange) {
+          response['rbfInfo'] = JSON.stringify(rbfChanges.trees[rbfChange]);
+        }
+
+        const mempoolTx = newMempool[trackTxid];
+        if (mempoolTx && mempoolTx.position) {
+          response['txPosition'] = JSON.stringify({
+            txid: trackTxid,
+            position: mempoolTx.position,
+          });
         }
       }
 
       if (client['track-mempool-block'] >= 0) {
         const index = client['track-mempool-block'];
         if (mBlockDeltas[index]) {
-          response['projected-block-transactions'] = {
+          response['projected-block-transactions'] = getCachedResponse(`projected-block-transactions-${index}`, {
             index: index,
             delta: mBlockDeltas[index],
-          };
+          });
         }
       }
 
+      if (client['track-rbf'] === 'all' && rbfReplacements) {
+        response['rbfLatest'] = getCachedResponse('rbfLatest', rbfReplacements);
+      } else if (client['track-rbf'] === 'fullRbf' && fullRbfReplacements) {
+        response['rbfLatest'] = getCachedResponse('fullrbfLatest', fullRbfReplacements);
+      }
+
       if (Object.keys(response).length) {
-        client.send(JSON.stringify(response));
+        const serializedResponse = '{'
+          + Object.keys(response).map(key => `"${key}": ${response[key]}`).join(', ')
+          + '}';
+        client.send(serializedResponse);
       }
     });
   }
@@ -421,17 +535,25 @@ class WebsocketHandler {
       throw new Error('WebSocket.Server is not set');
     }
 
+    this.printLogs();
+
     const _memPool = memPool.getMempool();
 
     if (config.MEMPOOL.AUDIT) {
       let projectedBlocks;
+      let auditMempool = _memPool;
       // template calculation functions have mempool side effects, so calculate audits using
       // a cloned copy of the mempool if we're running a different algorithm for mempool updates
-      const auditMempool = (config.MEMPOOL.ADVANCED_GBT_AUDIT === config.MEMPOOL.ADVANCED_GBT_MEMPOOL) ? _memPool : deepClone(_memPool);
+      const separateAudit = config.MEMPOOL.ADVANCED_GBT_AUDIT !== config.MEMPOOL.ADVANCED_GBT_MEMPOOL;
-      if (config.MEMPOOL.ADVANCED_GBT_AUDIT) {
+      if (separateAudit) {
-        projectedBlocks = await mempoolBlocks.makeBlockTemplates(auditMempool, false);
+        auditMempool = deepClone(_memPool);
+        if (config.MEMPOOL.ADVANCED_GBT_AUDIT) {
+          projectedBlocks = await mempoolBlocks.$makeBlockTemplates(auditMempool, false);
+        } else {
+          projectedBlocks = mempoolBlocks.updateMempoolBlocks(auditMempool, false);
+        }
       } else {
-        projectedBlocks = mempoolBlocks.updateMempoolBlocks(auditMempool, false);
+        projectedBlocks = mempoolBlocks.getMempoolBlocksWithTransactions();
       }
 
       if (Common.indexingEnabled() && memPool.isInSync()) {
@@ -477,16 +599,14 @@ class WebsocketHandler {
       }
     }
 
-    const removed: string[] = [];
     // Update mempool to remove transactions included in the new block
     for (const txId of txIds) {
       delete _memPool[txId];
-      removed.push(txId);
+      rbfCache.mined(txId);
-      rbfCache.evict(txId);
     }
 
     if (config.MEMPOOL.ADVANCED_GBT_MEMPOOL) {
-      await mempoolBlocks.updateBlockTemplates(_memPool, [], removed, true);
+      await mempoolBlocks.$makeBlockTemplates(_memPool, true);
     } else {
       mempoolBlocks.updateMempoolBlocks(_memPool, true);
     }
@@ -496,6 +616,19 @@ class WebsocketHandler {
     const da = difficultyAdjustment.getDifficultyAdjustment();
     const fees = feeApi.getRecommendedFee();
 
+    // update init data
+    this.updateInitData();
+
+    const responseCache = { ...this.initData };
+    function getCachedResponse(key, data): string {
+      if (!responseCache[key]) {
+        responseCache[key] = JSON.stringify(data);
+      }
+      return responseCache[key];
+    }
+
+    const mempoolInfo = memPool.getMempoolInfo();
+
     this.wss.clients.forEach((client) => {
       if (client.readyState !== WebSocket.OPEN) {
         return;
@@ -505,19 +638,29 @@ class WebsocketHandler {
         return;
       }
 
-      const response = {
+      const response = {};
-        'block': block,
+      response['block'] = getCachedResponse('block', block);
-        'mempoolInfo': memPool.getMempoolInfo(),
+      response['mempoolInfo'] = getCachedResponse('mempoolInfo', mempoolInfo);
-        'da': da?.previousTime ? da : undefined,
+      response['da'] = getCachedResponse('da', da?.previousTime ? da : undefined);
-        'fees': fees,
+      response['fees'] = getCachedResponse('fees', fees);
-      };
 
       if (mBlocks && client['want-mempool-blocks']) {
-        response['mempool-blocks'] = mBlocks;
+        response['mempool-blocks'] = getCachedResponse('mempool-blocks', mBlocks);
       }
 
-      if (client['track-tx'] && txIds.indexOf(client['track-tx']) > -1) {
+      if (client['track-tx']) {
-        response['txConfirmed'] = true;
+        const trackTxid = client['track-tx'];
+        if (txIds.indexOf(trackTxid) > -1) {
+          response['txConfirmed'] = 'true';
+        } else {
+          const mempoolTx = _memPool[trackTxid];
+          if (mempoolTx && mempoolTx.position) {
+            response['txPosition'] = JSON.stringify({
+              txid: trackTxid,
+              position: mempoolTx.position,
+            });
+          }
+        }
       }
 
       if (client['track-address']) {
@@ -543,7 +686,7 @@ class WebsocketHandler {
             };
           });
 
-          response['block-transactions'] = foundTransactions;
+          response['block-transactions'] = JSON.stringify(foundTransactions);
         }
       }
 
@@ -580,23 +723,37 @@ class WebsocketHandler {
             };
           });
 
-          response['block-transactions'] = foundTransactions;
+          response['block-transactions'] = JSON.stringify(foundTransactions);
         }
       }
 
       if (client['track-mempool-block'] >= 0) {
         const index = client['track-mempool-block'];
         if (mBlockDeltas && mBlockDeltas[index]) {
-          response['projected-block-transactions'] = {
+          response['projected-block-transactions'] = getCachedResponse(`projected-block-transactions-${index}`, {
             index: index,
             delta: mBlockDeltas[index],
-          };
+          });
         }
       }
 
-      client.send(JSON.stringify(response));
+      const serializedResponse = '{'
+        + Object.keys(response).map(key => `"${key}": ${response[key]}`).join(', ')
+        + '}';
+      client.send(serializedResponse);
     });
   }
+
+  private printLogs(): void {
+    if (this.wss) {
+      const count = this.wss?.clients?.size || 0;
+      const diff = count - this.numClients;
+      this.numClients = count;
+      logger.debug(`${count} websocket clients | ${this.numConnected} connected | ${this.numDisconnected} disconnected | (${diff >= 0 ? '+' : ''}${diff})`);
+      this.numConnected = 0;
+      this.numDisconnected = 0;
+    }
+  }
 }
 
 export default new WebsocketHandler();

backend/src/config.ts

@@ -37,6 +37,8 @@ interface IConfig {
   };
   ESPLORA: {
     REST_API_URL: string;
+    UNIX_SOCKET_PATH: string | void | null;
+    RETRY_UNIX_SOCKET_AFTER: number;
   };
   LIGHTNING: {
     ENABLED: boolean;
@@ -84,6 +86,7 @@ interface IConfig {
     DATABASE: string;
     USERNAME: string;
     PASSWORD: string;
+    TIMEOUT: number;
   };
   SYSLOG: {
     ENABLED: boolean;
@@ -163,6 +166,8 @@ const defaults: IConfig = {
   },
   'ESPLORA': {
     'REST_API_URL': 'http://127.0.0.1:3000',
+    'UNIX_SOCKET_PATH': null,
+    'RETRY_UNIX_SOCKET_AFTER': 30000,
   },
   'ELECTRUM': {
     'HOST': '127.0.0.1',
@@ -190,7 +195,8 @@ const defaults: IConfig = {
     'PORT': 3306,
     'DATABASE': 'mempool',
     'USERNAME': 'mempool',
-    'PASSWORD': 'mempool'
+    'PASSWORD': 'mempool',
+    'TIMEOUT': 180000,
   },
   'SYSLOG': {
     'ENABLED': true,

backend/src/database.ts

@@ -33,8 +33,32 @@ import { FieldPacket, OkPacket, PoolOptions, ResultSetHeader, RowDataPacket } fr
     OkPacket[] | ResultSetHeader>(query, params?): Promise<[T, FieldPacket[]]>
   {
     this.checkDBFlag();
-    const pool = await this.getPool();
+    let hardTimeout;
-    return pool.query(query, params);
+    if (query?.timeout != null) {
+      hardTimeout = Math.floor(query.timeout * 1.1);
+    } else {
+      hardTimeout = config.DATABASE.TIMEOUT;
+    }
+    if (hardTimeout > 0) {
+      return new Promise((resolve, reject) => {
+        const timer = setTimeout(() => {
+          reject(new Error(`DB query failed to return, reject or time out within ${hardTimeout / 1000}s - ${query?.sql?.slice(0, 160) || (typeof(query) === 'string' || query instanceof String ? query?.slice(0, 160) : 'unknown query')}`));
+        }, hardTimeout);
+
+        this.getPool().then(pool => {
+          return pool.query(query, params) as Promise<[T, FieldPacket[]]>;
+        }).then(result => {
+          resolve(result);
+        }).catch(error => {
+          reject(error);
+        }).finally(() => {
+          clearTimeout(timer);
+        });
+      });
+    } else {
+      const pool = await this.getPool();
+      return pool.query(query, params);
+    }
   }
 
   public async checkDbConnection() {

backend/src/index.ts

@@ -2,6 +2,7 @@ import express from 'express';
 import { Application, Request, Response, NextFunction } from 'express';
 import * as http from 'http';
 import * as WebSocket from 'ws';
+import bitcoinApi from './api/bitcoin/bitcoin-api-factory';
 import cluster from 'cluster';
 import DB from './database';
 import config from './config';
@@ -45,7 +46,8 @@ class Server {
   private wss: WebSocket.Server | undefined;
   private server: http.Server | undefined;
   private app: Application;
-  private currentBackendRetryInterval = 5;
+  private currentBackendRetryInterval = 1;
+  private backendRetryCount = 0;
 
   private maxHeapSize: number = 0;
   private heapLogInterval: number = 60;
@@ -120,7 +122,7 @@ class Server {
     await poolsUpdater.updatePoolsJson(); // Needs to be done before loading the disk cache because we sometimes wipe it
     await syncAssets.syncAssets$();
     if (config.MEMPOOL.ENABLED) {
-      diskCache.loadMempoolCache();
+      await diskCache.$loadMempoolCache();
     }
 
     if (config.STATISTICS.ENABLED && config.DATABASE.ENABLED && cluster.isPrimary) {
@@ -178,23 +180,26 @@ class Server {
           logger.debug(msg);
         }
       }
-      memPool.deleteExpiredTransactions();
+      const newMempool = await bitcoinApi.$getRawMempool();
-      await blocks.$updateBlocks();
+      const numHandledBlocks = await blocks.$updateBlocks();
-      await memPool.$updateMempool();
+      if (numHandledBlocks === 0) {
+        await memPool.$updateMempool(newMempool);
+      }
       indexer.$run();
 
-      setTimeout(this.runMainUpdateLoop.bind(this), config.MEMPOOL.POLL_RATE_MS);
+      // rerun immediately if we skipped the mempool update, otherwise wait POLL_RATE_MS
-      this.currentBackendRetryInterval = 5;
+      setTimeout(this.runMainUpdateLoop.bind(this), numHandledBlocks > 0 ? 1 : config.MEMPOOL.POLL_RATE_MS);
+      this.backendRetryCount = 0;
     } catch (e: any) {
-      let loggerMsg = `Exception in runMainUpdateLoop(). Retrying in ${this.currentBackendRetryInterval} sec.`;
+      this.backendRetryCount++;
+      let loggerMsg = `Exception in runMainUpdateLoop() (count: ${this.backendRetryCount}). Retrying in ${this.currentBackendRetryInterval} sec.`;
       loggerMsg += ` Reason: ${(e instanceof Error ? e.message : e)}.`;
       if (e?.stack) {
         loggerMsg += ` Stack trace: ${e.stack}`;
       }
       // When we get a first Exception, only `logger.debug` it and retry after 5 seconds
       // From the second Exception, `logger.warn` the Exception and increase the retry delay
-      // Maximum retry delay is 60 seconds
+      if (this.backendRetryCount >= 5) {
-      if (this.currentBackendRetryInterval > 5) {
         logger.warn(loggerMsg);
         mempool.setOutOfSync();
       } else {
@@ -204,8 +209,8 @@ class Server {
         logger.debug(`AxiosError: ${e?.message}`);
       }
       setTimeout(this.runMainUpdateLoop.bind(this), 1000 * this.currentBackendRetryInterval);
-      this.currentBackendRetryInterval *= 2;
+    } finally {
-      this.currentBackendRetryInterval = Math.min(this.currentBackendRetryInterval, 60);
+      diskCache.unlock();
     }
   }
 
@@ -238,7 +243,7 @@ class Server {
     websocketHandler.setupConnectionHandling();
     if (config.MEMPOOL.ENABLED) {
       statistics.setNewStatisticsEntryCallback(websocketHandler.handleNewStatistic.bind(websocketHandler));
-      memPool.setAsyncMempoolChangedCallback(websocketHandler.handleMempoolChange.bind(websocketHandler));
+      memPool.setAsyncMempoolChangedCallback(websocketHandler.$handleMempoolChange.bind(websocketHandler));
       blocks.setNewAsyncBlockCallback(websocketHandler.handleNewBlock.bind(websocketHandler));
     }
     priceUpdater.setRatesChangedCallback(websocketHandler.handleNewConversionRates.bind(websocketHandler));
@@ -276,7 +281,7 @@ class Server {
 
     if (!this.warnedHeapCritical && this.maxHeapSize > warnThreshold) {
       this.warnedHeapCritical = true;
-      logger.warn(`Used ${(this.maxHeapSize / stats.heap_size_limit).toFixed(2)}% of heap limit (${formatBytes(this.maxHeapSize, byteUnits, true)} / ${formatBytes(stats.heap_size_limit, byteUnits)})!`);
+      logger.warn(`Used ${(this.maxHeapSize / stats.heap_size_limit * 100).toFixed(2)}% of heap limit (${formatBytes(this.maxHeapSize, byteUnits, true)} / ${formatBytes(stats.heap_size_limit, byteUnits)})!`);
     }
     if (this.lastHeapLogTime === null || (now - this.lastHeapLogTime) > (this.heapLogInterval * 1000)) {
       logger.debug(`Memory usage: ${formatBytes(this.maxHeapSize, byteUnits)} / ${formatBytes(stats.heap_size_limit, byteUnits)}`);

backend/src/mempool.interfaces.ts

@@ -58,6 +58,7 @@ export interface MempoolBlockWithTransactions extends MempoolBlock {
 export interface MempoolBlockDelta {
   added: TransactionStripped[];
   removed: string[];
+  changed: { txid: string, rate: number | undefined }[];
 }
 
 interface VinStrippedToScriptsig {
@@ -79,18 +80,22 @@ export interface TransactionExtended extends IEsploraApi.Transaction {
   descendants?: Ancestor[];
   bestDescendant?: BestDescendant | null;
   cpfpChecked?: boolean;
-  deleteAfter?: number;
+  position?: {
+    block: number,
+    vsize: number,
+  };
+  uid?: number;
 }
 
 export interface AuditTransaction {
-  txid: string;
+  uid: number;
   fee: number;
   weight: number;
   feePerVsize: number;
   effectiveFeePerVsize: number;
-  vin: string[];
+  inputs: number[];
   relativesSet: boolean;
-  ancestorMap: Map<string, AuditTransaction>;
+  ancestorMap: Map<number, AuditTransaction>;
   children: Set<AuditTransaction>;
   ancestorFee: number;
   ancestorWeight: number;
@@ -100,13 +105,25 @@ export interface AuditTransaction {
   modifiedNode: HeapNode<AuditTransaction>;
 }
 
+export interface CompactThreadTransaction {
+  uid: number;
+  fee: number;
+  weight: number;
+  feePerVsize: number;
+  effectiveFeePerVsize?: number;
+  inputs: number[];
+  cpfpRoot?: string;
+  cpfpChecked?: boolean;
+  dirty?: boolean;
+}
+
 export interface ThreadTransaction {
   txid: string;
   fee: number;
   weight: number;
   feePerVsize: number;
   effectiveFeePerVsize?: number;
-  vin: string[];
+  inputs: number[];
   cpfpRoot?: string;
   cpfpChecked?: boolean;
 }
@@ -145,6 +162,7 @@ export interface TransactionStripped {
   fee: number;
   vsize: number;
   value: number;
+  rate?: number; // effective fee rate
 }
 
 export interface BlockExtension {

backend/src/repositories/BlocksRepository.ts

@@ -13,6 +13,48 @@ import chainTips from '../api/chain-tips';
 import blocks from '../api/blocks';
 import BlocksAuditsRepository from './BlocksAuditsRepository';
 
+interface DatabaseBlock {
+  id: string;
+  height: number;
+  version: number;
+  timestamp: number;
+  bits: number;
+  nonce: number;
+  difficulty: number;
+  merkle_root: string;
+  tx_count: number;
+  size: number;
+  weight: number;
+  previousblockhash: string;
+  mediantime: number;
+  totalFees: number;
+  medianFee: number;
+  feeRange: string;
+  reward: number;
+  poolId: number;
+  poolName: string;
+  poolSlug: string;
+  avgFee: number;
+  avgFeeRate: number;
+  coinbaseRaw: string;
+  coinbaseAddress: string;
+  coinbaseSignature: string;
+  coinbaseSignatureAscii: string;
+  avgTxSize: number;
+  totalInputs: number;
+  totalOutputs: number;
+  totalOutputAmt: number;
+  medianFeeAmt: number;
+  feePercentiles: string;
+  segwitTotalTxs: number;
+  segwitTotalSize: number;
+  segwitTotalWeight: number;
+  header: string;
+  utxoSetChange: number;
+  utxoSetSize: number;
+  totalInputAmt: number;
+}
+
 const BLOCK_DB_FIELDS = `
   blocks.hash AS id,
   blocks.height,
@@ -52,7 +94,7 @@ const BLOCK_DB_FIELDS = `
   blocks.header,
   blocks.utxoset_change AS utxoSetChange,
   blocks.utxoset_size AS utxoSetSize,
-  blocks.total_input_amt AS totalInputAmts
+  blocks.total_input_amt AS totalInputAmt
 `;
 
 class BlocksRepository {
@@ -171,6 +213,32 @@ class BlocksRepository {
     }
   }
 
+  /**
+   * Update missing fee amounts fields
+   *
+   * @param blockHash 
+   * @param feeAmtPercentiles 
+   * @param medianFeeAmt 
+   */
+  public async $updateFeeAmounts(blockHash: string, feeAmtPercentiles, medianFeeAmt) : Promise<void> {
+    try {
+      const query = `
+        UPDATE blocks
+        SET fee_percentiles = ?, median_fee_amt = ?
+        WHERE hash = ?
+      `;
+      const params: any[] = [
+        JSON.stringify(feeAmtPercentiles),
+        medianFeeAmt,
+        blockHash
+      ];
+      await DB.query(query, params);
+    } catch (e: any) {
+      logger.err(`Cannot update fee amounts for block ${blockHash}. Reason: ' + ${e instanceof Error ? e.message : e}`);
+      throw e;
+    }
+  }
+
   /**
    * Get all block height that have not been indexed between [startHeight, endHeight]
    */
@@ -432,7 +500,7 @@ class BlocksRepository {
 
       const blocks: BlockExtended[] = [];
       for (const block of rows) {
-        blocks.push(await this.formatDbBlockIntoExtendedBlock(block));
+        blocks.push(await this.formatDbBlockIntoExtendedBlock(block as DatabaseBlock));
       }
 
       return blocks;
@@ -459,37 +527,13 @@ class BlocksRepository {
         return null;
       }
 
-      return await this.formatDbBlockIntoExtendedBlock(rows[0]);  
+      return await this.formatDbBlockIntoExtendedBlock(rows[0] as DatabaseBlock);  
     } catch (e) {
       logger.err(`Cannot get indexed block ${height}. Reason: ` + (e instanceof Error ? e.message : e));
       throw e;
     }
   }
 
-  /**
-   * Get one block by hash
-   */
-  public async $getBlockByHash(hash: string): Promise<object | null> {
-    try {
-      const query = `
-        SELECT ${BLOCK_DB_FIELDS}
-        FROM blocks
-        JOIN pools ON blocks.pool_id = pools.id
-        WHERE hash = ?;
-      `;
-      const [rows]: any[] = await DB.query(query, [hash]);
-
-      if (rows.length <= 0) {
-        return null;
-      }
- 
-      return await this.formatDbBlockIntoExtendedBlock(rows[0]);
-    } catch (e) {
-      logger.err(`Cannot get indexed block ${hash}. Reason: ` + (e instanceof Error ? e.message : e));
-      throw e;
-    }
-  }
-
   /**
    * Return blocks difficulty
    */
@@ -599,7 +643,6 @@ class BlocksRepository {
         if (blocks[idx].previous_block_hash !== blocks[idx - 1].hash) {
           logger.warn(`Chain divergence detected at block ${blocks[idx - 1].height}`);
           await this.$deleteBlocksFrom(blocks[idx - 1].height);
-          await BlocksSummariesRepository.$deleteBlocksFrom(blocks[idx - 1].height);
           await HashratesRepository.$deleteHashratesFromTimestamp(blocks[idx - 1].timestamp - 604800);
           await DifficultyAdjustmentsRepository.$deleteAdjustementsFromHeight(blocks[idx - 1].height);
           return false;
@@ -619,7 +662,7 @@ class BlocksRepository {
    * Delete blocks from the database from blockHeight
    */
   public async $deleteBlocksFrom(blockHeight: number) {
-    logger.info(`Delete newer blocks from height ${blockHeight} from the database`);
+    logger.info(`Delete newer blocks from height ${blockHeight} from the database`, logger.tags.mining);
 
     try {
       await DB.query(`DELETE FROM blocks where height >= ${blockHeight}`);
@@ -933,7 +976,7 @@ class BlocksRepository {
    * 
    * @param dbBlk 
    */
-  private async formatDbBlockIntoExtendedBlock(dbBlk: any): Promise<BlockExtended> {
+  private async formatDbBlockIntoExtendedBlock(dbBlk: DatabaseBlock): Promise<BlockExtended> {
     const blk: Partial<BlockExtended> = {};
     const extras: Partial<BlockExtension> = {};
 
@@ -997,6 +1040,7 @@ class BlocksRepository {
     }
 
     // If we're missing block summary related field, check if we can populate them on the fly now
+    // This is for example triggered upon re-org
     if (Common.blocksSummariesIndexingEnabled() &&
       (extras.medianFeeAmt === null || extras.feePercentiles === null))
     {
@@ -1004,11 +1048,12 @@ class BlocksRepository {
       if (extras.feePercentiles === null) {
         const block = await bitcoinClient.getBlock(dbBlk.id, 2);
         const summary = blocks.summarizeBlock(block);
-        await BlocksSummariesRepository.$saveSummary({ height: block.height, mined: summary });
+        await BlocksSummariesRepository.$saveTransactions(dbBlk.height, dbBlk.id, summary.transactions);
         extras.feePercentiles = await BlocksSummariesRepository.$getFeePercentilesByBlockId(dbBlk.id);
       }
       if (extras.feePercentiles !== null) {
         extras.medianFeeAmt = extras.feePercentiles[3];
+        await this.$updateFeeAmounts(dbBlk.id, extras.feePercentiles, extras.medianFeeAmt);
       }
     }
 

backend/src/repositories/BlocksSummariesRepository.ts

@@ -1,6 +1,6 @@
 import DB from '../database';
 import logger from '../logger';
-import { BlockSummary } from '../mempool.interfaces';
+import { BlockSummary, TransactionStripped } from '../mempool.interfaces';
 
 class BlocksSummariesRepository {
   public async $getByBlockId(id: string): Promise<BlockSummary | undefined> {
@@ -17,23 +17,17 @@ class BlocksSummariesRepository {
     return undefined;
   }
 
-  public async $saveSummary(params: { height: number, mined?: BlockSummary}) {
+  public async $saveTransactions(blockHeight: number, blockId: string, transactions: TransactionStripped[]): Promise<void> {
-    const blockId = params.mined?.id;
     try {
-      const transactions = JSON.stringify(params.mined?.transactions || []);
+      const transactionsStr = JSON.stringify(transactions);
       await DB.query(`
-        INSERT INTO blocks_summaries (height, id, transactions, template)
+        INSERT INTO blocks_summaries
-        VALUE (?, ?, ?, ?)
+        SET height = ?, transactions = ?, id = ?
-        ON DUPLICATE KEY UPDATE
+        ON DUPLICATE KEY UPDATE transactions = ?`,
-          transactions = ?
+        [blockHeight, transactionsStr, blockId, transactionsStr]);
-      `, [params.height, blockId, transactions, '[]', transactions]);
     } catch (e: any) {
-      if (e.errno === 1062) { // ER_DUP_ENTRY - This scenario is possible upon node backend restart
+      logger.debug(`Cannot save block summary transactions for ${blockId}. Reason: ${e instanceof Error ? e.message : e}`);
-        logger.debug(`Cannot save block summary for ${blockId} because it has already been indexed, ignoring`);
+      throw e;
-      } else {
-        logger.debug(`Cannot save block summary for ${blockId}. Reason: ${e instanceof Error ? e.message : e}`);
-        throw e;
-      }
     }
   }
 
@@ -68,19 +62,6 @@ class BlocksSummariesRepository {
     return [];
   }
 
-  /**
-   * Delete blocks from the database from blockHeight
-   */
-  public async $deleteBlocksFrom(blockHeight: number) {
-    logger.info(`Delete newer blocks summary from height ${blockHeight} from the database`);
-
-    try {
-      await DB.query(`DELETE FROM blocks_summaries where height >= ${blockHeight}`);
-    } catch (e) {
-      logger.err('Cannot delete indexed blocks summaries. Reason: ' + (e instanceof Error ? e.message : e));
-    }
-  }
-
   /**
    * Get the fee percentiles if the block has already been indexed, [] otherwise
    * 

backend/src/repositories/HashratesRepository.ts

@@ -220,7 +220,7 @@ class HashratesRepository {
    * Delete hashrates from the database from timestamp
    */
   public async $deleteHashratesFromTimestamp(timestamp: number) {
-    logger.info(`Delete newer hashrates from timestamp ${new Date(timestamp * 1000).toUTCString()} from the database`);
+    logger.info(`Delete newer hashrates from timestamp ${new Date(timestamp * 1000).toUTCString()} from the database`, logger.tags.mining);
 
     try {
       await DB.query(`DELETE FROM hashrates WHERE hashrate_timestamp >= FROM_UNIXTIME(?)`, [timestamp]);

backend/src/repositories/PricesRepository.ts

@@ -160,7 +160,7 @@ class PricesRepository {
 
       // Compute fiat exchange rates
       let latestPrice = rates[0] as ApiPrice;
-      if (latestPrice.USD === -1) {
+      if (!latestPrice || latestPrice.USD === -1) {
         latestPrice = priceUpdater.getEmptyPricesObj();
       }
 

backend/src/tasks/lightning/forensics.service.ts

@@ -27,7 +27,7 @@ class ForensicsService {
 
   private async $runTasks(): Promise<void> {
     try {
-      logger.info(`Running forensics scans`);
+      logger.debug(`Running forensics scans`);
 
       if (config.MEMPOOL.BACKEND === 'esplora') {
         await this.$runClosedChannelsForensics(false);
@@ -73,7 +73,7 @@ class ForensicsService {
     let progress = 0;
 
     try {
-      logger.info(`Started running closed channel forensics...`);
+      logger.debug(`Started running closed channel forensics...`);
       let channels;
       if (onlyNewChannels) {
         channels = await channelsApi.$getClosedChannelsWithoutReason();
@@ -152,11 +152,11 @@ class ForensicsService {
         ++progress;
         const elapsedSeconds = Math.round((new Date().getTime() / 1000) - this.loggerTimer);
         if (elapsedSeconds > 10) {
-          logger.info(`Updating channel closed channel forensics ${progress}/${channels.length}`);
+          logger.debug(`Updating channel closed channel forensics ${progress}/${channels.length}`);
           this.loggerTimer = new Date().getTime() / 1000;
         }
       }
-      logger.info(`Closed channels forensics scan complete.`);
+      logger.debug(`Closed channels forensics scan complete.`);
     } catch (e) {
       logger.err('$runClosedChannelsForensics() error: ' + (e instanceof Error ? e.message : e));
     }
@@ -217,7 +217,7 @@ class ForensicsService {
     let progress = 0;
 
     try {
-      logger.info(`Started running open channel forensics...`);
+      logger.debug(`Started running open channel forensics...`);
       const channels = await channelsApi.$getChannelsWithoutSourceChecked();
 
       for (const openChannel of channels) {
@@ -257,7 +257,7 @@ class ForensicsService {
         ++progress;
         const elapsedSeconds = Math.round((new Date().getTime() / 1000) - this.loggerTimer);
         if (elapsedSeconds > 10) {
-          logger.info(`Updating opened channel forensics ${progress}/${channels?.length}`);
+          logger.debug(`Updating opened channel forensics ${progress}/${channels?.length}`);
           this.loggerTimer = new Date().getTime() / 1000;
           this.truncateTempCache();
         }
@@ -266,7 +266,7 @@ class ForensicsService {
         }
       }
 
-      logger.info(`Open channels forensics scan complete.`);
+      logger.debug(`Open channels forensics scan complete.`);
     } catch (e) {
       logger.err('$runOpenedChannelsForensics() error: ' + (e instanceof Error ? e.message : e));
     } finally {

backend/src/tasks/lightning/network-sync.service.ts

@@ -287,7 +287,7 @@ class NetworkSyncService {
       } else {
         log += ` for the first time`;
       }
-      logger.info(`${log}`, logger.tags.ln);
+      logger.debug(`${log}`, logger.tags.ln);
 
       const channels = await channelsApi.$getChannelsByStatus([0, 1]);
       for (const channel of channels) {
@@ -304,7 +304,7 @@ class NetworkSyncService {
         ++progress;
         const elapsedSeconds = Math.round((new Date().getTime() / 1000) - this.loggerTimer);
         if (elapsedSeconds > config.LIGHTNING.LOGGER_UPDATE_INTERVAL) {
-          logger.info(`Checking if channel has been closed ${progress}/${channels.length}`, logger.tags.ln);
+          logger.debug(`Checking if channel has been closed ${progress}/${channels.length}`, logger.tags.ln);
           this.loggerTimer = new Date().getTime() / 1000;
         }
       }

backend/src/tasks/lightning/sync-tasks/stats-importer.ts

@@ -15,16 +15,20 @@ class LightningStatsImporter {
   topologiesFolder = config.LIGHTNING.TOPOLOGY_FOLDER;
 
   async $run(): Promise<void> {
-    const [channels]: any[] = await DB.query('SELECT short_id from channels;');
+    try {
-    logger.info(`Caching funding txs for currently existing channels`, logger.tags.ln);
+      const [channels]: any[] = await DB.query('SELECT short_id from channels;');
-    await fundingTxFetcher.$fetchChannelsFundingTxs(channels.map(channel => channel.short_id));
+      logger.info(`Caching funding txs for currently existing channels`, logger.tags.ln);
+      await fundingTxFetcher.$fetchChannelsFundingTxs(channels.map(channel => channel.short_id));
 
-    if (config.MEMPOOL.NETWORK !== 'mainnet' || config.DATABASE.ENABLED === false) {
+      if (config.MEMPOOL.NETWORK !== 'mainnet' || config.DATABASE.ENABLED === false) {
-      return;
+        return;
+      }
+
+      await this.$importHistoricalLightningStats();
+      await this.$cleanupIncorrectSnapshot();
+    } catch (e) {
+      logger.err(`Exception in LightningStatsImporter::$run(). ${e}`);
     }
-
-    await this.$importHistoricalLightningStats();
-    await this.$cleanupIncorrectSnapshot();
   }
 
   /**

backend/src/tasks/pools-updater.ts

@@ -62,7 +62,7 @@ class PoolsUpdater {
       if (this.currentSha === null) {
         logger.info(`Downloading pools-v2.json for the first time from ${this.poolsUrl} over ${network}`, logger.tags.mining);
       } else {
-        logger.warn(`pools-v2.json is outdated, fetch latest from ${this.poolsUrl} over ${network}`, logger.tags.mining);
+        logger.warn(`pools-v2.json is outdated, fetching latest from ${this.poolsUrl} over ${network}`, logger.tags.mining);
       }
       const poolsJson = await this.query(this.poolsUrl);
       if (poolsJson === undefined) {

backend/src/tasks/price-updater.ts

@@ -222,7 +222,7 @@ class PriceUpdater {
   private async $insertMissingRecentPrices(type: 'hour' | 'day'): Promise<void> {
     const existingPriceTimes = await PricesRepository.$getPricesTimes();
 
-    logger.info(`Fetching ${type === 'day' ? 'dai' : 'hour'}ly price history from exchanges and saving missing ones into the database`, logger.tags.mining);
+    logger.debug(`Fetching ${type === 'day' ? 'dai' : 'hour'}ly price history from exchanges and saving missing ones into the database`, logger.tags.mining);
 
     const historicalPrices: PriceHistory[] = [];
 

backend/tsconfig.json

@@ -5,6 +5,7 @@
     "types": ["node", "jest"],
     "lib": ["es2019", "dom"],
     "strict": true,
+    "skipLibCheck": true,
     "noImplicitAny": false,
     "sourceMap": false,
     "outDir": "dist",

docker/README.md

@@ -204,7 +204,9 @@ Corresponding `docker-compose.yml` overrides:
 `mempool-config.json`:
 ```json
   "ESPLORA": {
-    "REST_API_URL": "http://127.0.0.1:3000"
+    "REST_API_URL": "http://127.0.0.1:3000",
+    "UNIX_SOCKET_PATH": "/tmp/esplora-socket",
+    "RETRY_UNIX_SOCKET_AFTER": 30000
   },
 ```
 
@@ -213,6 +215,8 @@ Corresponding `docker-compose.yml` overrides:
   api:
     environment:
       ESPLORA_REST_API_URL: ""
+      ESPLORA_UNIX_SOCKET_PATH: ""
+      ESPLORA_RETRY_UNIX_SOCKET_AFTER: ""
       ...
 ```
 
@@ -265,6 +269,7 @@ Corresponding `docker-compose.yml` overrides:
       DATABASE_DATABASE: ""
       DATABASE_USERNAME: ""
       DATABASE_PASSWORD: ""
+      DATABASE_TIMEOUT: ""
       ...
 ```
 

docker/backend/mempool-config.json

@@ -42,7 +42,9 @@
     "TLS_ENABLED": __ELECTRUM_TLS_ENABLED__
   },
   "ESPLORA": {
-    "REST_API_URL": "__ESPLORA_REST_API_URL__"
+    "REST_API_URL": "__ESPLORA_REST_API_URL__",
+    "UNIX_SOCKET_PATH": "__ESPLORA_UNIX_SOCKET_PATH__",
+    "RETRY_UNIX_SOCKET_AFTER": __ESPLORA_RETRY_UNIX_SOCKET_AFTER__
   },
   "SECOND_CORE_RPC": {
     "HOST": "__SECOND_CORE_RPC_HOST__",
@@ -58,7 +60,8 @@
     "PORT": __DATABASE_PORT__,
     "DATABASE": "__DATABASE_DATABASE__",
     "USERNAME": "__DATABASE_USERNAME__",
-    "PASSWORD": "__DATABASE_PASSWORD__"
+    "PASSWORD": "__DATABASE_PASSWORD__",
+    "TIMEOUT": "__DATABASE_TIMEOUT__"
   },
   "SYSLOG": {
     "ENABLED": __SYSLOG_ENABLED__,

docker/backend/start.sh

@@ -46,6 +46,8 @@ __ELECTRUM_TLS_ENABLED__=${ELECTRUM_TLS_ENABLED:=false}
 
 # ESPLORA
 __ESPLORA_REST_API_URL__=${ESPLORA_REST_API_URL:=http://127.0.0.1:3000}
+__ESPLORA_UNIX_SOCKET_PATH__=${ESPLORA_UNIX_SOCKET_PATH:=null}
+__ESPLORA_RETRY_UNIX_SOCKET_AFTER__=${ESPLORA_RETRY_UNIX_SOCKET_AFTER:=30000}
 
 # SECOND_CORE_RPC
 __SECOND_CORE_RPC_HOST__=${SECOND_CORE_RPC_HOST:=127.0.0.1}
@@ -62,6 +64,7 @@ __DATABASE_PORT__=${DATABASE_PORT:=3306}
 __DATABASE_DATABASE__=${DATABASE_DATABASE:=mempool}
 __DATABASE_USERNAME__=${DATABASE_USERNAME:=mempool}
 __DATABASE_PASSWORD__=${DATABASE_PASSWORD:=mempool}
+__DATABASE_TIMEOUT__=${DATABASE_TIMEOUT:=180000}
 
 # SYSLOG
 __SYSLOG_ENABLED__=${SYSLOG_ENABLED:=false}
@@ -166,6 +169,8 @@ sed -i "s/__ELECTRUM_PORT__/${__ELECTRUM_PORT__}/g" mempool-config.json
 sed -i "s/__ELECTRUM_TLS_ENABLED__/${__ELECTRUM_TLS_ENABLED__}/g" mempool-config.json
 
 sed -i "s!__ESPLORA_REST_API_URL__!${__ESPLORA_REST_API_URL__}!g" mempool-config.json
+sed -i "s!__ESPLORA_UNIX_SOCKET_PATH__!${__ESPLORA_UNIX_SOCKET_PATH__}!g" mempool-config.json
+sed -i "s!__ESPLORA_RETRY_UNIX_SOCKET_AFTER__!${__ESPLORA_RETRY_UNIX_SOCKET_AFTER__}!g" mempool-config.json
 
 sed -i "s/__SECOND_CORE_RPC_HOST__/${__SECOND_CORE_RPC_HOST__}/g" mempool-config.json
 sed -i "s/__SECOND_CORE_RPC_PORT__/${__SECOND_CORE_RPC_PORT__}/g" mempool-config.json

docker/frontend/entrypoint.sh

@@ -39,6 +39,7 @@ __AUDIT__=${AUDIT:=false}
 __MAINNET_BLOCK_AUDIT_START_HEIGHT__=${MAINNET_BLOCK_AUDIT_START_HEIGHT:=0}
 __TESTNET_BLOCK_AUDIT_START_HEIGHT__=${TESTNET_BLOCK_AUDIT_START_HEIGHT:=0}
 __SIGNET_BLOCK_AUDIT_START_HEIGHT__=${SIGNET_BLOCK_AUDIT_START_HEIGHT:=0}
+__FULL_RBF_ENABLED__=${FULL_RBF_ENABLED:=false}
 __HISTORICAL_PRICE__=${HISTORICAL_PRICE:=true}
 
 # Export as environment variables to be used by envsubst
@@ -65,6 +66,7 @@ export __AUDIT__
 export __MAINNET_BLOCK_AUDIT_START_HEIGHT__
 export __TESTNET_BLOCK_AUDIT_START_HEIGHT__
 export __SIGNET_BLOCK_AUDIT_START_HEIGHT__
+export __FULL_RBF_ENABLED__
 export __HISTORICAL_PRICE__
 
 folder=$(find /var/www/mempool -name "config.js" | xargs dirname)

frontend/cypress/e2e/mainnet/mainnet.spec.ts

@@ -127,7 +127,7 @@ describe('Mainnet', () => {
 
         cy.get('.search-box-container > .form-control').type('S').then(() => {
           cy.wait('@search-1wizS');
-          cy.get('app-search-results button.dropdown-item').should('have.length', 5);
+          cy.get('app-search-results button.dropdown-item').should('have.length', 6);
         });
 
         cy.get('.search-box-container > .form-control').type('A').then(() => {

frontend/mempool-frontend-config.sample.json

@@ -22,5 +22,6 @@
   "TESTNET_BLOCK_AUDIT_START_HEIGHT": 0,
   "SIGNET_BLOCK_AUDIT_START_HEIGHT": 0,
   "LIGHTNING": false,
+  "FULL_RBF_ENABLED": false,
   "HISTORICAL_PRICE": true
 }

frontend/src/app/app-routing.module.ts

@@ -4,6 +4,8 @@ import { AppPreloadingStrategy } from './app.preloading-strategy'
 import { StartComponent } from './components/start/start.component';
 import { TransactionComponent } from './components/transaction/transaction.component';
 import { BlockComponent } from './components/block/block.component';
+import { ClockMinedComponent as ClockMinedComponent } from './components/clock/clock-mined.component';
+import { ClockMempoolComponent as ClockMempoolComponent } from './components/clock/clock-mempool.component';
 import { AddressComponent } from './components/address/address.component';
 import { MasterPageComponent } from './components/master-page/master-page.component';
 import { AboutComponent } from './components/about/about.component';
@@ -14,6 +16,7 @@ import { TrademarkPolicyComponent } from './components/trademark-policy/trademar
 import { BisqMasterPageComponent } from './components/bisq-master-page/bisq-master-page.component';
 import { PushTransactionComponent } from './components/push-transaction/push-transaction.component';
 import { BlocksList } from './components/blocks-list/blocks-list.component';
+import { RbfList } from './components/rbf-list/rbf-list.component';
 import { LiquidMasterPageComponent } from './components/liquid-master-page/liquid-master-page.component';
 import { AssetGroupComponent } from './components/assets/asset-group/asset-group.component';
 import { AssetsFeaturedComponent } from './components/assets/assets-featured/assets-featured.component';
@@ -56,6 +59,10 @@ let routes: Routes = [
             path: 'blocks',
             component: BlocksList,
           },
+          {
+            path: 'rbf',
+            component: RbfList,
+          },
           {
             path: 'terms-of-service',
             component: TermsOfServiceComponent
@@ -162,6 +169,10 @@ let routes: Routes = [
             path: 'blocks',
             component: BlocksList,
           },
+          {
+            path: 'rbf',
+            component: RbfList,
+          },
           {
             path: 'terms-of-service',
             component: TermsOfServiceComponent
@@ -264,6 +275,10 @@ let routes: Routes = [
         path: 'blocks',
         component: BlocksList,
       },
+      {
+        path: 'rbf',
+        component: RbfList,
+      },
       {
         path: 'terms-of-service',
         component: TermsOfServiceComponent
@@ -342,6 +357,14 @@ let routes: Routes = [
       },
     ],
   },
+  {
+    path: 'clock-mined',
+    component: ClockMinedComponent,
+  },
+  {
+    path: 'clock-mempool',
+    component: ClockMempoolComponent,
+  },
   {
     path: 'status',
     data: { networks: ['bitcoin', 'liquid'] },

frontend/src/app/app.constants.ts

@@ -29,6 +29,14 @@ export const mempoolFeeColors = [
   'ba3243',
   'b92b48',
   'b9254b',
+  'b8214d',
+  'b71d4f',
+  'b61951',
+  'b41453',
+  'b30e55',
+  'b10857',
+  'b00259',
+  'ae005b',
 ];
 
 export const chartColors = [
@@ -69,6 +77,7 @@ export const chartColors = [
   "#3E2723",
   "#212121",
   "#263238",
+  "#801313",
 ];
 
 export const poolsColor = {

frontend/src/app/bisq/bisq-main-dashboard/bisq-main-dashboard.component.html

@@ -107,12 +107,7 @@
 
   <app-language-selector></app-language-selector>
 
-  <div class="text-small text-center mt-3">
+  <app-global-footer></app-global-footer>
-    <a [routerLink]="['/terms-of-service']" i18n="shared.terms-of-service|Terms of Service">Terms of Service</a>
-    |
-    <a [routerLink]="['/privacy-policy']" i18n="shared.privacy-policy|Privacy Policy">Privacy Policy</a>
-  </div>
-
 </div>
 
 <ng-template #loadingTmpl>

frontend/src/app/components/about/about.component.html

@@ -107,22 +107,7 @@
         <span>Blockstream</span>
       </a>
       <a href="https://unchained.com/" target="_blank" title="Unchained">
-        <svg xmlns="http://www.w3.org/2000/svg" version="1.1" x="0px" y="0px" viewBox="0 0 216 216" class="image" style="enable-background:new 0 0 216 216;">
+        <svg id="Layer_1" width="78" height="78" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 156.68 156.68"><defs><style>.cls-unchained-1{fill:#fff;}</style></defs><path class="cls-unchained-1" d="m78.34,0C35.07,0,0,35.07,0,78.34s35.07,78.34,78.34,78.34,78.34-35.07,78.34-78.34S121.6,0,78.34,0ZM20.23,109.5c-4.99-9.28-7.81-19.89-7.81-31.16C12.42,41.93,41.93,12.42,78.34,12.42c33.15,0,60.58,24.46,65.23,56.32h-37.48c-45.29,0-71.19,20.05-85.85,40.76Zm58.11,34.76c-12.42,0-24.04-3.44-33.96-9.41,3.94-8.85,9.11-18.7,15.84-28.9,20.99-31.8,52.2-31.19,76.49-31.19h7.45c.06,1.18.1,2.38.1,3.58,0,36.41-29.51,65.92-65.92,65.92Z"/><path class="cls-unchained-1" d="m91.98,42.4l-3.62-1.18c-3.94-1.29-7.03-4.38-8.32-8.32l-1.18-3.63c-.13-.39-.68-.39-.81,0l-1.18,3.63c-1.29,3.94-4.38,7.03-8.32,8.32l-3.62,1.18c-.39.13-.39.68,0,.81l3.62,1.18c3.94,1.29,7.03,4.38,8.32,8.32l1.18,3.63c.13.39.68.39.81,0l1.18-3.63c1.29-3.94,4.38-7.03,8.32-8.32l3.62-1.18c.39-.13.39-.68,0-.81Z"/></svg>
-        <style type="text/css">
-          .ucst0{fill:#002248;}
-          .ucst1{opacity:0.5;fill:#FFFFFF;}
-          .ucst2{fill:#FFFFFF;}
-          .ucst3{opacity:0.75;fill:#FFFFFF;}
-        </style>
-        <rect class="ucst0" width="216" height="216"/>
-        <g>
-          <g>
-            <path class="ucst1" d="M108,39.5V108l59.3,34.2V73.8L108,39.5z M126.9,95.4c0,2,1.1,3.8,2.8,4.8l27.9,16l0,10.8L125,108.2c-4.6-2.6-7.4-7.5-7.4-12.8l-0.1-22.7c0-1.9,0.5-3.7,1.4-5.3c0.9-1.5,2.2-2.9,3.8-3.8c3.3-1.9,7.2-1.9,10.5,0l24.5,14.2l-0.2,10.7l-29-16.8c-0.5-0.3-0.9-0.2-1.2,0c-0.3,0.2-0.6,0.5-0.6,1L126.9,95.4z"/>
-            <path class="ucst2" d="M108,39.5L48.7,73.8v68.5L108,108V39.5z M99.7,93.1c0,5.3-2.8,10.2-7.4,12.8l-19.6,11.4c-1.7,1-3.5,1.4-5.3,1.5c-1.8,0-3.6-0.5-5.2-1.4c-3.3-1.9-5.3-5.3-5.3-9.1V80l9.4-5.2l-0.1,33.5c0,0.6,0.3,0.9,0.6,1c0.3,0.2,0.7,0.3,1.2,0l19.6-11.4c1.7-1,2.8-2.8,2.8-4.8L90.3,61l9.4-5.4L99.7,93.1z"/>
-            <path class="ucst3" d="M108,108l-59.3,34.2l59.3,34.2l59.3-34.2L108,108z M133.8,152l-24.5,14.2l-9.2-5.5l29.1-16.7c0.5-0.3,0.6-0.7,0.6-1c0-0.3-0.1-0.7-0.6-1l-19.7-11.2c-1.7-1-3.8-1-5.5,0l-27.8,16.1l-9.4-5.4l32.6-18.7c4.6-2.6,10.2-2.6,14.8,0l19.7,11.2c1.7,0.9,3,2.3,3.9,3.9c0.9,1.5,1.4,3.3,1.4,5.2C139.1,146.7,137.1,150.1,133.8,152z"/>
-          </g>
-        </g>
-        </svg>
         <span>Unchained</span>
       </a>
       <a href="https://gemini.com/" target="_blank" title="Gemini">
@@ -204,9 +189,9 @@
         <img class="image" src="/resources/profile/raspiblitz.svg" />
         <span>RaspiBlitz</span>
       </a>
-      <a href="https://github.com/mynodebtc/mynode" target="_blank" title="MyNode">
+      <a href="https://github.com/mynodebtc/mynode" target="_blank" title="myNode">
-        <img class="image" src="/resources/profile/mynodebtc.jpg" />
+        <img class="image" src="/resources/profile/mynodebtc.png" />
-        <span>MyNode</span>
+        <span>myNode</span>
       </a>
       <a href="https://github.com/RoninDojo/RoninDojo" target="_blank" title="RoninDojo">
         <img class="image" src="/resources/profile/ronindojo.png" />
@@ -253,7 +238,7 @@
         <span>Sparrow</span>
       </a>
       <a href="https://github.com/ACINQ/phoenix" target="_blank" title="Phoenix Wallet by ACINQ">
-        <img class="image" src="/resources/profile/phoenix.jpg" />
+        <img class="image not-rounded" src="/resources/profile/phoenix.svg" />
         <span>Phoenix</span>
       </a>
       <a href="https://github.com/lnbits/lnbits-legend" target="_blank" title="LNbits">
@@ -408,7 +393,6 @@
 
   <div class="footer-links">
     <a href="/3rdpartylicenses.txt">Third-party Licenses</a>
-    <a [routerLink]="['/terms-of-service']" i18n="shared.terms-of-service|Terms of Service">Terms of Service</a>
     <div class="social-icons">
       <a target="_blank" href="https://github.com/mempool/mempool">
         <svg aria-hidden="true" focusable="false" data-prefix="fab" data-icon="github" class="svg-inline--fa fa-github fa-w-16 fa-2x" role="img" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 496 512"><path fill="currentColor" d="M165.9 397.4c0 2-2.3 3.6-5.2 3.6-3.3.3-5.6-1.3-5.6-3.6 0-2 2.3-3.6 5.2-3.6 3-.3 5.6 1.3 5.6 3.6zm-31.1-4.5c-.7 2 1.3 4.3 4.3 4.9 2.6 1 5.6 0 6.2-2s-1.3-4.3-4.3-5.2c-2.6-.7-5.5.3-6.2 2.3zm44.2-1.7c-2.9.7-4.9 2.6-4.6 4.9.3 2 2.9 3.3 5.9 2.6 2.9-.7 4.9-2.6 4.6-4.6-.3-1.9-3-3.2-5.9-2.9zM244.8 8C106.1 8 0 113.3 0 252c0 110.9 69.8 205.8 169.5 239.2 12.8 2.3 17.3-5.6 17.3-12.1 0-6.2-.3-40.4-.3-61.4 0 0-70 15-84.7-29.8 0 0-11.4-29.1-27.8-36.6 0 0-22.9-15.7 1.6-15.4 0 0 24.9 2 38.6 25.8 21.9 38.6 58.6 27.5 72.9 20.9 2.3-16 8.8-27.1 16-33.7-55.9-6.2-112.3-14.3-112.3-110.5 0-27.5 7.6-41.3 23.6-58.9-2.6-6.5-11.1-33.3 2.6-67.9 20.9-6.5 69 27 69 27 20-5.6 41.5-8.5 62.8-8.5s42.8 2.9 62.8 8.5c0 0 48.1-33.6 69-27 13.7 34.7 5.2 61.4 2.6 67.9 16 17.7 25.8 31.5 25.8 58.9 0 96.5-58.9 104.2-114.8 110.5 9.2 7.9 17 22.9 17 46.4 0 33.7-.3 75.4-.3 83.6 0 6.5 4.6 14.4 17.3 12.1C428.2 457.8 496 362.9 496 252 496 113.3 383.5 8 244.8 8zM97.2 352.9c-1.3 1-1 3.3.7 5.2 1.6 1.6 3.9 2.3 5.2 1 1.3-1 1-3.3-.7-5.2-1.6-1.6-3.9-2.3-5.2-1zm-10.8-8.1c-.7 1.3.3 2.9 2.3 3.9 1.6 1 3.6.7 4.3-.7.7-1.3-.3-2.9-2.3-3.9-2-.6-3.6-.3-4.3.7zm32.4 35.6c-1.6 1.3-1 4.3 1.3 6.2 2.3 2.3 5.2 2.6 6.5 1 1.3-1.3.7-4.3-1.3-6.2-2.2-2.3-5.2-2.6-6.5-1zm-11.4-14.7c-1.6 1-1.6 3.6 0 5.9 1.6 2.3 4.3 3.3 5.6 2.3 1.6-1.3 1.6-3.9 0-6.2-1.4-2.3-4-3.3-5.6-2z"></path></svg>
@@ -432,9 +416,12 @@
     {{ (backendInfo$ | async)?.hostname }} (v{{ (backendInfo$ | async )?.version }}) [<a href="https://github.com/mempool/mempool/commit/{{ (backendInfo$ | async )?.gitCommit | slice:0:8 }}">{{ (backendInfo$ | async )?.gitCommit | slice:0:8 }}</a>]
   </div>
 
+  <br>
 </div>
 
+
 <ng-template #loadingSponsors>
   <br>
   <div class="spinner-border text-light"></div>
 </ng-template>
+

frontend/src/app/components/block-fee-rates-graph/block-fee-rates-graph.component.scss

@@ -4,6 +4,9 @@
   @media (min-width: 465px) {
     font-size: 20px;
   }
+  @media (min-width: 992px) {
+    height: 40px;
+  }
 }
 
 .main-title {
@@ -18,17 +21,19 @@
 }
 
 .full-container {
+  display: flex;
+  flex-direction: column;
   padding: 0px 15px;
   width: 100%;
-  min-height: 500px;
+  height: calc(100vh - 250px);
-  height: calc(100% - 150px);
+  @media (min-width: 992px) {
-  @media (max-width: 992px) {
+    height: calc(100vh - 150px);
-    padding-bottom: 100px;
+  }
-  };
 }
 
 .chart {
-  width: 100%;
+  display: flex;
+  flex: 1;
   height: 100%;
   padding-bottom: 20px;
   padding-right: 10px;

frontend/src/app/components/block-fees-graph/block-fees-graph.component.scss

@@ -4,6 +4,9 @@
   @media (min-width: 465px) {
     font-size: 20px;
   }
+  @media (min-width: 992px) {
+    height: 40px;
+  }
 }
 
 .main-title {
@@ -18,18 +21,20 @@
 }
 
 .full-container {
+  display: flex;
+  flex-direction: column;
   padding: 0px 15px;
   width: 100%;
-  min-height: 500px;
+  height: calc(100vh - 250px);
-  height: calc(100% - 150px);
+  @media (min-width: 992px) {
-  @media (max-width: 992px) {
+    height: calc(100vh - 150px);
-    padding-bottom: 100px;
+  }
-  };
 }
 
 .chart {
+  display: flex;
+  flex: 1;
   width: 100%;
-  height: 100%;
   padding-bottom: 20px;
   padding-right: 10px;
   @media (max-width: 992px) {

frontend/src/app/components/block-overview-graph/block-overview-graph.component.ts

@@ -23,7 +23,8 @@ export class BlockOverviewGraphComponent implements AfterViewInit, OnDestroy, On
   @Input() unavailable: boolean = false;
   @Input() auditHighlighting: boolean = false;
   @Input() blockConversion: Price;
-  @Output() txClickEvent = new EventEmitter<TransactionStripped>();
+  @Input() pixelAlign: boolean = false;
+  @Output() txClickEvent = new EventEmitter<{ tx: TransactionStripped, keyModifier: boolean}>();
   @Output() txHoverEvent = new EventEmitter<string>();
   @Output() readyEvent = new EventEmitter();
 
@@ -132,9 +133,9 @@ export class BlockOverviewGraphComponent implements AfterViewInit, OnDestroy, On
     }
   }
 
-  update(add: TransactionStripped[], remove: string[], direction: string = 'left', resetLayout: boolean = false): void {
+  update(add: TransactionStripped[], remove: string[], change: { txid: string, rate: number | undefined }[], direction: string = 'left', resetLayout: boolean = false): void {
     if (this.scene) {
-      this.scene.update(add, remove, direction, resetLayout);
+      this.scene.update(add, remove, change, direction, resetLayout);
       this.start();
     }
   }
@@ -201,7 +202,8 @@ export class BlockOverviewGraphComponent implements AfterViewInit, OnDestroy, On
       this.start();
     } else {
       this.scene = new BlockScene({ width: this.displayWidth, height: this.displayHeight, resolution: this.resolution,
-        blockLimit: this.blockLimit, orientation: this.orientation, flip: this.flip, vertexArray: this.vertexArray, highlighting: this.auditHighlighting });
+        blockLimit: this.blockLimit, orientation: this.orientation, flip: this.flip, vertexArray: this.vertexArray,
+        highlighting: this.auditHighlighting, pixelAlign: this.pixelAlign });
       this.start();
     }
   }
@@ -326,7 +328,9 @@ export class BlockOverviewGraphComponent implements AfterViewInit, OnDestroy, On
     if (event.target === this.canvas.nativeElement && event.pointerType === 'touch') {
       this.setPreviewTx(event.offsetX, event.offsetY, true);
     } else if (event.target === this.canvas.nativeElement) {
-      this.onTxClick(event.offsetX, event.offsetY);
+      const keyMod = event.shiftKey || event.ctrlKey || event.metaKey;
+      const middleClick = event.which === 2 || event.button === 1;
+      this.onTxClick(event.offsetX, event.offsetY, keyMod || middleClick);
     }
   }
 
@@ -409,12 +413,12 @@ export class BlockOverviewGraphComponent implements AfterViewInit, OnDestroy, On
     }
   }
 
-  onTxClick(cssX: number, cssY: number) {
+  onTxClick(cssX: number, cssY: number, keyModifier: boolean = false) {
     const x = cssX * window.devicePixelRatio;
     const y = cssY * window.devicePixelRatio;
     const selected = this.scene.getTxAt({ x, y });
     if (selected && selected.txid) {
-      this.txClickEvent.emit(selected);
+      this.txClickEvent.emit({ tx: selected, keyModifier });
     }
   }
 

frontend/src/app/components/block-overview-graph/block-scene.ts

@@ -15,6 +15,7 @@ export default class BlockScene {
   gridWidth: number;
   gridHeight: number;
   gridSize: number;
+  pixelAlign: boolean;
   vbytesPerUnit: number;
   unitPadding: number;
   unitWidth: number;
@@ -23,19 +24,24 @@ export default class BlockScene {
   animateUntil = 0;
   dirty: boolean;
 
-  constructor({ width, height, resolution, blockLimit, orientation, flip, vertexArray, highlighting }:
+  constructor({ width, height, resolution, blockLimit, orientation, flip, vertexArray, highlighting, pixelAlign }:
       { width: number, height: number, resolution: number, blockLimit: number,
-        orientation: string, flip: boolean, vertexArray: FastVertexArray, highlighting: boolean }
+        orientation: string, flip: boolean, vertexArray: FastVertexArray, highlighting: boolean, pixelAlign: boolean }
   ) {
-    this.init({ width, height, resolution, blockLimit, orientation, flip, vertexArray, highlighting });
+    this.init({ width, height, resolution, blockLimit, orientation, flip, vertexArray, highlighting, pixelAlign });
   }
 
   resize({ width = this.width, height = this.height, animate = true }: { width?: number, height?: number, animate: boolean }): void {
     this.width = width;
     this.height = height;
     this.gridSize = this.width / this.gridWidth;
-    this.unitPadding =  width / 500;
+    if (this.pixelAlign) {
-    this.unitWidth = this.gridSize - (this.unitPadding * 2);
+      this.unitPadding =  Math.max(1, Math.floor(this.gridSize / 2.5));
+      this.unitWidth = this.gridSize - (this.unitPadding);
+    } else {
+      this.unitPadding =  width / 500;
+      this.unitWidth = this.gridSize - (this.unitPadding * 2);
+    }
 
     this.dirty = true;
     if (this.initialised && this.scene) {
@@ -150,7 +156,7 @@ export default class BlockScene {
     this.updateAll(startTime, 200, direction);
   }
 
-  update(add: TransactionStripped[], remove: string[], direction: string = 'left', resetLayout: boolean = false): void {
+  update(add: TransactionStripped[], remove: string[], change: { txid: string, rate: number | undefined }[], direction: string = 'left', resetLayout: boolean = false): void {
     const startTime = performance.now();
     const removed = this.removeBatch(remove, startTime, direction);
 
@@ -172,6 +178,15 @@ export default class BlockScene {
         this.place(tx);
       });
     } else {
+      // update effective rates
+      change.forEach(tx => {
+        if (this.txs[tx.txid]) {
+          this.txs[tx.txid].feerate = tx.rate || (this.txs[tx.txid].fee / this.txs[tx.txid].vsize);
+          this.txs[tx.txid].rate = tx.rate;
+          this.txs[tx.txid].dirty = true;
+        }
+      });
+
       // try to insert new txs directly
       const remaining = [];
       add.map(tx => new TxView(tx, this)).sort(feeRateDescending).forEach(tx => {
@@ -200,14 +215,15 @@ export default class BlockScene {
     this.animateUntil = Math.max(this.animateUntil, tx.setHover(value));
   }
 
-  private init({ width, height, resolution, blockLimit, orientation, flip, vertexArray, highlighting }:
+  private init({ width, height, resolution, blockLimit, orientation, flip, vertexArray, highlighting, pixelAlign }:
       { width: number, height: number, resolution: number, blockLimit: number,
-        orientation: string, flip: boolean, vertexArray: FastVertexArray, highlighting: boolean }
+        orientation: string, flip: boolean, vertexArray: FastVertexArray, highlighting: boolean, pixelAlign: boolean }
   ): void {
     this.orientation = orientation;
     this.flip = flip;
     this.vertexArray = vertexArray;
     this.highlightingEnabled = highlighting;
+    this.pixelAlign = pixelAlign;
 
     this.scene = {
       count: 0,
@@ -333,7 +349,12 @@ export default class BlockScene {
   private gridToScreen(position: Square | void): Square {
     if (position) {
       const slotSize = (position.s * this.gridSize);
-      const squareSize = slotSize - (this.unitPadding * 2);
+      let squareSize;
+      if (this.pixelAlign) {
+        squareSize = slotSize - (this.unitPadding);
+      } else {
+        squareSize = slotSize - (this.unitPadding * 2);
+      }
 
       // The grid is laid out notionally left-to-right, bottom-to-top,
       // so we rotate and/or flip the y axis to match the target configuration.

frontend/src/app/components/block-overview-graph/tx-view.ts

@@ -36,6 +36,7 @@ export default class TxView implements TransactionStripped {
   vsize: number;
   value: number;
   feerate: number;
+  rate?: number;
   status?: 'found' | 'missing' | 'fresh' | 'added' | 'censored' | 'selected';
   context?: 'projected' | 'actual';
   scene?: BlockScene;
@@ -58,7 +59,8 @@ export default class TxView implements TransactionStripped {
     this.fee = tx.fee;
     this.vsize = tx.vsize;
     this.value = tx.value;
-    this.feerate = tx.fee / tx.vsize;
+    this.feerate = tx.rate || (tx.fee / tx.vsize); // sort by effective fee rate where available
+    this.rate = tx.rate;
     this.status = tx.status;
     this.initialised = false;
     this.vertexArray = scene.vertexArray;
@@ -157,7 +159,8 @@ export default class TxView implements TransactionStripped {
   }
 
   getColor(): Color {
-    const feeLevelIndex = feeLevels.findIndex((feeLvl) => Math.max(1, this.feerate) < feeLvl) - 1;
+    const rate = this.fee / this.vsize; // color by simple single-tx fee rate
+    const feeLevelIndex = feeLevels.findIndex((feeLvl) => Math.max(1, rate) < feeLvl) - 1;
     const feeLevelColor = feeColors[feeLevelIndex] || feeColors[mempoolFeeColors.length - 1];
     // Normal mode
     if (!this.scene?.highlightingEnabled) {

frontend/src/app/components/block-overview-tooltip/block-overview-tooltip.component.html

@@ -28,6 +28,12 @@
           {{ feeRate | feeRounding }} <span class="symbol" i18n="shared.sat-vbyte|sat/vB">sat/vB</span>
         </td>
       </tr>
+      <tr *ngIf="effectiveRate && effectiveRate !== feeRate">
+        <td class="td-width" i18n="transaction.effective-fee-rate|Effective transaction fee rate">Effective fee rate</td>
+        <td>
+          {{ effectiveRate | feeRounding }} <span class="symbol" i18n="shared.sat-vbyte|sat/vB">sat/vB</span>
+        </td>
+      </tr>
       <tr>
         <td class="td-width" i18n="transaction.vsize|Transaction Virtual Size">Virtual size</td>
         <td [innerHTML]="'&lrm;' + (vsize | vbytes: 2)"></td>

frontend/src/app/components/block-overview-tooltip/block-overview-tooltip.component.ts

@@ -20,6 +20,7 @@ export class BlockOverviewTooltipComponent implements OnChanges {
   value = 0;
   vsize = 1;
   feeRate = 0;
+  effectiveRate;
 
   tooltipPosition: Position = { x: 0, y: 0 };
 
@@ -51,6 +52,7 @@ export class BlockOverviewTooltipComponent implements OnChanges {
       this.value = tx.value || 0;
       this.vsize = tx.vsize || 1;
       this.feeRate = this.fee / this.vsize;
+      this.effectiveRate = tx.rate;
     }
   }
 }

frontend/src/app/components/block-prediction-graph/block-prediction-graph.component.scss

@@ -4,6 +4,9 @@
   @media (min-width: 465px) {
     font-size: 20px;
   }
+  @media (min-width: 992px) {
+    height: 40px;
+  }
 }
 
 .main-title {
@@ -18,17 +21,19 @@
 }
 
 .full-container {
+  display: flex;
+  flex-direction: column;
   padding: 0px 15px;
   width: 100%;
-  min-height: 500px;
+  height: calc(100vh - 250px);
-  height: calc(100% - 150px);
+  @media (min-width: 992px) {
-  @media (max-width: 992px) {
+    height: calc(100vh - 150px);
-    padding-bottom: 100px;
+  }
-  };
 }
 
 .chart {
-  width: 100%;
+  display: flex;
+  flex: 1;
   height: 100%;
   padding-bottom: 20px;
   padding-right: 10px;

frontend/src/app/components/block-rewards-graph/block-rewards-graph.component.scss

@@ -4,6 +4,9 @@
   @media (min-width: 465px) {
     font-size: 20px;
   }
+  @media (min-width: 992px) {
+    height: 40px;
+  }
 }
 
 .main-title {
@@ -18,17 +21,19 @@
 }
 
 .full-container {
+  display: flex;
+  flex-direction: column;
   padding: 0px 15px;
   width: 100%;
-  min-height: 500px;
+  height: calc(100vh - 250px);
-  height: calc(100% - 150px);
+  @media (min-width: 992px) {
-  @media (max-width: 992px) {
+    height: calc(100vh - 150px);
-    padding-bottom: 100px;
+  }
-  };
 }
 
 .chart {
-  width: 100%;
+  display: flex;
+  flex: 1;
   height: 100%;
   padding-bottom: 20px;
   padding-right: 10px;

frontend/src/app/components/block-sizes-weights-graph/block-sizes-weights-graph.component.scss

@@ -4,6 +4,9 @@
   @media (min-width: 465px) {
     font-size: 20px;
   }
+  @media (min-width: 992px) {
+    height: 40px;
+  }
 }
 
 .main-title {
@@ -18,17 +21,19 @@
 }
 
 .full-container {
+  display: flex;
+  flex-direction: column;
   padding: 0px 15px;
   width: 100%;
-  min-height: 500px;
+  height: calc(100vh - 250px);
-  height: calc(100% - 150px);
+  @media (min-width: 992px) {
-  @media (max-width: 992px) {
+    height: calc(100vh - 150px);
-    padding-bottom: 100px;
+  }
-  };
 }
 
 .chart {
-  width: 100%;
+  display: flex;
+  flex: 1;
   height: 100%;
   padding-bottom: 20px;
   padding-right: 10px;

frontend/src/app/components/block/block.component.ts

@@ -612,9 +612,13 @@ export class BlockComponent implements OnInit, OnDestroy {
     });
   }
 
-  onTxClick(event: TransactionStripped): void {
+  onTxClick(event: { tx: TransactionStripped, keyModifier: boolean }): void {
-    const url = new RelativeUrlPipe(this.stateService).transform(`/tx/${event.txid}`);
+    const url = new RelativeUrlPipe(this.stateService).transform(`/tx/${event.tx.txid}`);
-    this.router.navigate([url]);
+    if (!event.keyModifier) {
+      this.router.navigate([url]);
+    } else {
+      window.open(url, '_blank');
+    }
   }
 
   onTxHover(txid: string): void {

frontend/src/app/components/blockchain-blocks/blockchain-blocks.component.html

@@ -1,53 +1,61 @@
-<div class="blocks-container blockchain-blocks-container" [class.time-ltr]="timeLtr"
+<div class="blocks-container blockchain-blocks-container" [class.time-ltr]="timeLtr" [class.minimal]="minimal"
-  [style.left]="static ? (offset || 0) + 'px' : null"
+  [style.left]="static ? (offset || 0) + 'px' : null" [style.--block-size]="blockWidth+'px'"
   *ngIf="static || (loadingBlocks$ | async) === false; else loadingBlocksTemplate">
   <div *ngFor="let block of blocks; let i = index; trackBy: trackByBlocksFn">
     <ng-container *ngIf="connected && block && !block.loading && !block.placeholder; else placeholderBlock">
+      <div
+        *ngIf="minimal && spotlight < 0 && chainTip + spotlight + 1 === block.height"
+        class="spotlight-bottom"
+        [style.left]="blockStyles[i].left"
+      ></div>
       <div [attr.data-cy]="'bitcoin-block-offset-' + offset + '-index-' + i"
         class="text-center bitcoin-block mined-block blockchain-blocks-offset-{{ offset }}-index-{{ i }}"
+        [class.offscreen]="!static && count && i >= count"
         id="bitcoin-block-{{ block.height }}" [ngStyle]="blockStyles[i]"
         [class.blink-bg]="isSpecial(block.height)">
         <a draggable="false" [routerLink]="['/block/' | relativeUrl, block.id]" [state]="{ data: { block: block } }"
           class="blockLink" [ngClass]="{'disabled': (this.stateService.blockScrolling$ | async)}">&nbsp;</a>
-        <div [attr.data-cy]="'bitcoin-block-' + i + '-height'" class="block-height">
+        <div *ngIf="!minimal" [attr.data-cy]="'bitcoin-block-' + i + '-height'" class="block-height">
           <a [routerLink]="['/block/' | relativeUrl, block.id]" [state]="{ data: { block: block } }">{{ block.height
             }}</a>
         </div>
         <div class="block-body">
-          <div *ngIf="block?.extras; else emptyfees" [attr.data-cy]="'bitcoin-block-offset=' + offset + '-index-' + i + '-fees'" class="fees">
+          <ng-container *ngIf="!minimal">
-            ~{{ block?.extras?.medianFee | number:feeRounding }} <ng-container
+            <div *ngIf="block?.extras; else emptyfees" [attr.data-cy]="'bitcoin-block-offset=' + offset + '-index-' + i + '-fees'" class="fees">
-              i18n="shared.sat-vbyte|sat/vB">sat/vB</ng-container>
+              ~{{ block?.extras?.medianFee | number:feeRounding }} <ng-container
-          </div>
+                i18n="shared.sat-vbyte|sat/vB">sat/vB</ng-container>
-          <ng-template #emptyfees>
-            <div [attr.data-cy]="'bitcoin-block-offset=' + offset + '-index-' + i + '-fees'" class="fees">
-              &nbsp;
             </div>
-          </ng-template>
+            <ng-template #emptyfees>
-          <div [attr.data-cy]="'bitcoin-block-' + offset + '-index-' + i + '-fee-span'" class="fee-span"
+              <div [attr.data-cy]="'bitcoin-block-offset=' + offset + '-index-' + i + '-fees'" class="fees">
-            *ngIf="block?.extras?.feeRange; else emptyfeespan">
+                &nbsp;
-            {{ block?.extras?.feeRange?.[0] | number:feeRounding }} - {{
+              </div>
-            block?.extras?.feeRange[block?.extras?.feeRange?.length - 1] | number:feeRounding }} <ng-container
+            </ng-template>
-              i18n="shared.sat-vbyte|sat/vB">sat/vB</ng-container>
+            <div [attr.data-cy]="'bitcoin-block-' + offset + '-index-' + i + '-fee-span'" class="fee-span"
-          </div>
+              *ngIf="block?.extras?.feeRange; else emptyfeespan">
-          <ng-template #emptyfeespan>
+              {{ block?.extras?.feeRange?.[0] | number:feeRounding }} - {{
-            <div [attr.data-cy]="'bitcoin-block-offset=' + offset + '-index-' + i + '-fees'" class="fee-span">
+              block?.extras?.feeRange[block?.extras?.feeRange?.length - 1] | number:feeRounding }} <ng-container
-              &nbsp;
+                i18n="shared.sat-vbyte|sat/vB">sat/vB</ng-container>
             </div>
-          </ng-template>
+            <ng-template #emptyfeespan>
-          <div [attr.data-cy]="'bitcoin-block-' + offset + '-index-' + i + '-total-fees'" *ngIf="showMiningInfo"
+              <div [attr.data-cy]="'bitcoin-block-offset=' + offset + '-index-' + i + '-fees'" class="fee-span">
-            class="block-size">
+                &nbsp;
-            <app-amount [satoshis]="block.extras?.totalFees ?? 0" digitsInfo="1.2-3" [noFiat]="true"></app-amount>
+              </div>
-          </div>
+            </ng-template>
-          <div [attr.data-cy]="'bitcoin-block-' + offset + '-index-' + i + 'block-size'" *ngIf="!showMiningInfo"
+            <div [attr.data-cy]="'bitcoin-block-' + offset + '-index-' + i + '-total-fees'" *ngIf="showMiningInfo"
-            class="block-size" [innerHTML]="'&lrm;' + (block.size | bytes: 2)"></div>
+              class="block-size">
-          <div [attr.data-cy]="'bitcoin-block-' + i + '-transactions'" class="transaction-count">
+              <app-amount [satoshis]="block.extras?.totalFees ?? 0" digitsInfo="1.2-3" [noFiat]="true"></app-amount>
-            <ng-container
+            </div>
-              *ngTemplateOutlet="block.tx_count === 1 ? transactionsSingular : transactionsPlural; context: {$implicit: block.tx_count | number}"></ng-container>
+            <div [attr.data-cy]="'bitcoin-block-' + offset + '-index-' + i + 'block-size'" *ngIf="!showMiningInfo"
-            <ng-template #transactionsSingular let-i i18n="shared.transaction-count.singular">{{ i }} transaction</ng-template>
+              class="block-size" [innerHTML]="'&lrm;' + (block.size | bytes: 2)"></div>
-            <ng-template #transactionsPlural let-i i18n="shared.transaction-count.plural">{{ i }} transactions</ng-template>
+            <div [attr.data-cy]="'bitcoin-block-' + i + '-transactions'" class="transaction-count">
-          </div>
+              <ng-container
-          <div [attr.data-cy]="'bitcoin-block-' + offset + '-index-' + i + '-time'" class="time-difference">
+                *ngTemplateOutlet="block.tx_count === 1 ? transactionsSingular : transactionsPlural; context: {$implicit: block.tx_count | number}"></ng-container>
-            <app-time kind="since" [time]="block.timestamp" [fastRender]="true"></app-time></div>
+              <ng-template #transactionsSingular let-i i18n="shared.transaction-count.singular">{{ i }} transaction</ng-template>
+              <ng-template #transactionsPlural let-i i18n="shared.transaction-count.plural">{{ i }} transactions</ng-template>
+            </div>
+            <div [attr.data-cy]="'bitcoin-block-' + offset + '-index-' + i + '-time'" class="time-difference">
+              <app-time kind="since" [time]="block.timestamp" [fastRender]="true"></app-time></div>
+          </ng-container>
         </div>
         <div class="animated" [class]="showMiningInfo ? 'show' : 'hide'" *ngIf="block.extras?.pool != undefined">
           <a [attr.data-cy]="'bitcoin-block-' + offset + '-index-' + i + '-pool'" class="badge badge-primary"
@@ -79,11 +87,11 @@
 </div>
 
 <ng-template #loadingBlocksTemplate>
-  <div class="blocks-container" [class.time-ltr]="timeLtr">
+  <div class="blocks-container" [class.time-ltr]="timeLtr" [style.--block-size]="blockWidth+'px'">
     <div class="flashing">
       <div *ngFor="let block of emptyBlocks; let i = index; trackBy: trackByBlocksFn">
         <div class="text-center bitcoin-block mined-block" id="bitcoin-block-{{ block.height }}"
-          [ngStyle]="emptyBlockStyles[i]"></div>
+          [ngStyle]="emptyBlockStyles[i]" [class.offscreen]="!static && count && i >= count"></div>
       </div>
     </div>
   </div>

frontend/src/app/components/blockchain-blocks/blockchain-blocks.component.scss

@@ -1,6 +1,6 @@
 .bitcoin-block {
-  width: 125px;
+  width: var(--block-size);
-  height: 125px;
+  height: var(--block-size);
 }
 
 .blockLink {
@@ -22,7 +22,11 @@
 .mined-block {
   position: absolute;
   top: 0px;
-  transition: background 2s, left 2s, transform 1s;
+  transition: background 2s, left 2s, transform 1s, opacity 1s;
+}
+
+.mined-block.offscreen {
+  opacity: 0;
 }
 
 .mined-block.placeholder-block {
@@ -35,9 +39,11 @@
 }
 
 .blocks-container {
+  --block-size: 125px;
+  --block-offset: calc(0.32 * var(--block-size));
   position: absolute;
   top: 0px;
-  left: 40px;
+  left: var(--block-offset);
 }
 
 .block-body {
@@ -77,11 +83,11 @@
 
 .bitcoin-block::after {
   content: '';
-  width: 125px;
+  width: var(--block-size);
-  height: 24px;
+  height: calc(0.192 * var(--block-size));
   position:absolute;
-  top: -24px;
+  top: calc(-0.192 * var(--block-size));
-  left: -20px;
+  left: calc(-0.16 * var(--block-size));
   background-color: #232838;
   transform:skew(40deg);
   transform-origin:top;
@@ -89,11 +95,11 @@
 
 .bitcoin-block::before {
   content: '';
-  width: 20px;
+  width: calc(0.16 * var(--block-size));
-  height: 125px;
+  height: var(--block-size);
   position: absolute;
-  top: -12px;
+  top: calc(-0.096 * var(--block-size));
-  left: -20px;
+  left: calc(-0.16 * var(--block-size));
   background-color: #191c27;
 
   transform: skewY(50deg);
@@ -168,4 +174,16 @@
   .bitcoin-block {
     transform: scaleX(-1);
   }
+}
+
+.spotlight-bottom {
+  position: absolute;
+  width: calc(0.6 * var(--block-size));
+  height: calc(0.25 * var(--block-size));
+  border-left: solid calc(0.3 * var(--block-size)) transparent;
+  border-bottom: solid calc(0.3 * var(--block-size)) white;
+  border-right: solid calc(0.3 * var(--block-size)) transparent;
+  transform: translate(calc(0.2 * var(--block-size)), calc(1.1 * var(--block-size)));
+  border-radius: 2px;
+  z-index: -1;
 }

frontend/src/app/components/blockchain-blocks/blockchain-blocks.component.ts

@@ -24,6 +24,9 @@ export class BlockchainBlocksComponent implements OnInit, OnChanges, OnDestroy {
   @Input() count: number = 8; // number of blocks in this chunk (dynamic blocks only)
   @Input() loadingTip: boolean = false;
   @Input() connected: boolean = true;
+  @Input() minimal: boolean = false;
+  @Input() blockWidth: number = 125;
+  @Input() spotlight: number = 0;
   
   specialBlocks = specialBlocks;
   network = '';
@@ -51,6 +54,10 @@ export class BlockchainBlocksComponent implements OnInit, OnChanges, OnDestroy {
   timeLtrSubscription: Subscription;
   timeLtr: boolean;
 
+  blockOffset: number = 155;
+  dividerBlockOffset: number = 205;
+  blockPadding: number = 30;
+
   gradientColors = {
     '': ['#9339f4', '#105fb0'],
     bisq: ['#9339f4', '#105fb0'],
@@ -118,7 +125,7 @@ export class BlockchainBlocksComponent implements OnInit, OnChanges, OnDestroy {
 
           this.blockStyles = [];
           if (this.blocksFilled && block.height > this.chainTip) {
-            this.blocks.forEach((b, i) => this.blockStyles.push(this.getStyleForBlock(b, i, i ? -155 : -205)));
+            this.blocks.forEach((b, i) => this.blockStyles.push(this.getStyleForBlock(b, i, i ? -this.blockOffset : -this.dividerBlockOffset)));
             setTimeout(() => {
               this.blockStyles = [];
               this.blocks.forEach((b, i) => this.blockStyles.push(this.getStyleForBlock(b, i)));
@@ -159,6 +166,13 @@ export class BlockchainBlocksComponent implements OnInit, OnChanges, OnDestroy {
   }
 
   ngOnChanges(changes: SimpleChanges): void {
+    if (changes.blockWidth && this.blockWidth) {
+      this.blockPadding = 0.24 * this.blockWidth;
+      this.blockOffset = this.blockWidth + this.blockPadding;
+      this.dividerBlockOffset = this.blockOffset + (0.4 * this.blockWidth);
+      this.blockStyles = [];
+      this.blocks.forEach((b, i) => this.blockStyles.push(this.getStyleForBlock(b, i)));
+    }
     if (this.static) {
       const animateSlide = changes.height && (changes.height.currentValue === changes.height.previousValue + 1);
       this.updateStaticBlocks(animateSlide);
@@ -191,14 +205,14 @@ export class BlockchainBlocksComponent implements OnInit, OnChanges, OnDestroy {
       }
       this.arrowVisible = true;
       if (newBlockFromLeft) {
-        this.arrowLeftPx = blockindex * 155 + 30 - 205;
+        this.arrowLeftPx = blockindex * this.blockOffset + this.blockPadding - this.dividerBlockOffset;
         setTimeout(() => {
           this.arrowTransition = '2s';
-          this.arrowLeftPx = blockindex * 155 + 30;
+          this.arrowLeftPx = blockindex * this.blockOffset + this.blockPadding;
           this.cd.markForCheck();
         }, 50);
       } else {
-        this.arrowLeftPx = blockindex * 155 + 30;
+        this.arrowLeftPx = blockindex * this.blockOffset + this.blockPadding;
         if (!animate) {
           setTimeout(() => {
             this.arrowTransition = '2s';
@@ -245,7 +259,7 @@ export class BlockchainBlocksComponent implements OnInit, OnChanges, OnDestroy {
     }
     this.blocks = this.blocks.slice(0, this.count);
     this.blockStyles = [];
-    this.blocks.forEach((b, i) => this.blockStyles.push(this.getStyleForBlock(b, i, animateSlide ? -155 : 0)));
+    this.blocks.forEach((b, i) => this.blockStyles.push(this.getStyleForBlock(b, i, animateSlide ? -this.blockOffset : 0)));
     this.cd.markForCheck();
     if (animateSlide) {
       // animate blocks slide right
@@ -287,7 +301,7 @@ export class BlockchainBlocksComponent implements OnInit, OnChanges, OnDestroy {
     }
 
     return {
-      left: addLeft + 155 * index + 'px',
+      left: addLeft + this.blockOffset * index + 'px',
       background: `repeating-linear-gradient(
         #2d3348,
         #2d3348 ${greenBackgroundHeight}%,
@@ -309,7 +323,7 @@ export class BlockchainBlocksComponent implements OnInit, OnChanges, OnDestroy {
     const addLeft = animateEnterFrom || 0;
 
     return {
-      left: addLeft + (155 * index) + 'px',
+      left: addLeft + (this.blockOffset * index) + 'px',
       background: "#2d3348",
     };
   }
@@ -317,7 +331,7 @@ export class BlockchainBlocksComponent implements OnInit, OnChanges, OnDestroy {
   getStyleForPlaceholderBlock(index: number, animateEnterFrom: number = 0) {
     const addLeft = animateEnterFrom || 0;
     return {
-      left: addLeft + (155 * index) + 'px',
+      left: addLeft + (this.blockOffset * index) + 'px',
     };
   }
 
@@ -325,7 +339,7 @@ export class BlockchainBlocksComponent implements OnInit, OnChanges, OnDestroy {
     const addLeft = animateEnterFrom || 0;
 
     return {
-      left: addLeft + 155 * this.emptyBlocks.indexOf(block) + 'px',
+      left: addLeft + this.blockOffset * this.emptyBlocks.indexOf(block) + 'px',
       background: "#2d3348",
     };
   }

frontend/src/app/components/clock-face/clock-face.component.html

@@ -0,0 +1,42 @@
+<div class="clock-face" [style]="faceStyle">
+  <ng-content></ng-content>
+  <svg
+    class="cut-out"
+    width="384"
+    height="384"
+    viewBox="0 0 384 384"
+  >
+    <g>
+      <path
+        class="face"
+        d="M 0,0 V 384 H 384 V 0 Z M 192,15 A 177,177 0 0 1 369,192 177,177 0 0 1 192,369 177,177 0 0 1 15,192 177,177 0 0 1 192,15 Z"
+      />
+    </g>
+  </svg>
+
+  <svg
+    class="demo-dial"
+    width="384"
+    height="384"
+    viewBox="0 0 384 384"
+  >
+    <defs>
+      <pattern id="dial-gradient" patternUnits="userSpaceOnUse" width="384" height="384">
+        <image class="dial-gradient-img" href="/resources/clock/gradient.png" x="0" y="0" width="384" height="384" [style.transform]="'rotate(' + (minutes * 6) + 'deg)'" />
+      </pattern>
+    </defs>
+
+    <path *ngFor="let angle of minorTicks" class="tick minor" d="M 192,27 v 10" [style.transform]="'rotate(' + angle + 'deg)'"/>
+    <path *ngFor="let angle of majorTicks" class="tick major" d="M 192,27 v 18" [style.transform]="'rotate(' + angle + 'deg)'"/>
+
+    <ng-container *ngFor="let segment of segments; trackBy: trackBySegment">
+      <path class="block-segment" [attr.d]="segment.path" />
+      <!-- <circle class="segment-mark start" [attr.cx]="segment.start.x" [attr.cy]="segment.start.y" r="2" style="fill:green;stroke:white;stroke-width:1px;" />
+      <circle class="segment-mark end" [attr.cx]="segment.end.x" [attr.cy]="segment.end.y" r="2" style="fill:red;stroke:white;stroke-width:1px;" /> -->
+    </ng-container>
+    <!-- <polyline points="468.750,82.031 468.750,35 " id="polyline322" style="fill:none;stroke:#ffffff;stroke-width:4.84839;stroke-dasharray:none;stroke-opacity:1" transform="matrix(0.41250847,0,0,0.93092534,-1.3627708,-32.692008)" /> -->
+    <path class="tick very major" d="M 192,0 v 45" />
+    <path id="hour" class="gnomon hour" d="M 178,3 206,3 192,40 Z" [style.transform]="'rotate(' + (hours * 30) + 'deg)'" />
+    <path id="minute" class="gnomon minute" d="M 180,4 204,4 192,38 Z" [style.transform]="'rotate(' + (minutes * 6) + 'deg)'" />
+  </svg>
+</div>

frontend/src/app/components/clock-face/clock-face.component.scss

@@ -0,0 +1,69 @@
+.clock-face {
+  position: relative;
+  height: 84.375%;
+  margin: auto;
+  overflow: hidden;
+
+  .cut-out, .demo-dial {
+    position: absolute;
+    left: 0;
+    right: 0;
+    top: 0;
+    bottom: 0;
+    width: 100%;
+    height: 100%;
+
+    .face {
+      fill: #11131f;
+    }
+  }
+
+  .gnomon {
+    transform-origin: center;
+    stroke-linejoin: round;
+
+    &.minute {
+      fill:#80C2E1;
+      stroke:#80C2E1;
+      stroke-width: 2px;
+    }
+
+    &.hour {
+      fill: #105fb0;
+      stroke: #105fb0;
+      stroke-width: 6px;
+    }
+  }
+
+  .tick {
+    transform-origin: center;
+    fill: none;
+    stroke: white;
+    stroke-width: 2px;
+    stroke-linecap: butt;
+
+    &.minor {
+      stroke-opacity: 0.5;
+    }
+
+    &.very.major {
+      stroke-width: 4px;
+    }
+  }
+
+  .block-segment {
+    fill: none;
+    stroke: url(#dial-gradient);
+    stroke-width: 18px;
+  }
+
+  .dial-segment {
+    fill: none;
+    stroke: white;
+    stroke-width: 2px;
+  }
+
+  .dial-gradient-img {
+    transform-origin: center;
+  }
+}

frontend/src/app/components/clock-face/clock-face.component.ts

@@ -0,0 +1,148 @@
+import { ChangeDetectionStrategy, ChangeDetectorRef, Component, Input, OnChanges, OnDestroy, OnInit } from '@angular/core';
+import { Subscription, tap, timer } from 'rxjs';
+import { WebsocketService } from '../../services/websocket.service';
+import { StateService } from '../../services/state.service';
+
+@Component({
+  selector: 'app-clock-face',
+  templateUrl: './clock-face.component.html',
+  styleUrls: ['./clock-face.component.scss'],
+  changeDetection: ChangeDetectionStrategy.OnPush,
+})
+export class ClockFaceComponent implements OnInit, OnChanges, OnDestroy {
+  @Input() size: number = 300;
+
+  blocksSubscription: Subscription;
+  timeSubscription: Subscription;
+
+  faceStyle;
+  dialPath;
+  blockTimes = [];
+  segments = [];
+  hours: number = 0;
+  minutes: number = 0;
+  minorTicks: number[] = [];
+  majorTicks: number[] = [];
+
+  constructor(
+    public stateService: StateService,
+    private websocketService: WebsocketService,
+    private cd: ChangeDetectorRef
+  ) {
+    this.updateTime();
+    this.makeTicks();
+  }
+
+  ngOnInit(): void {
+    this.timeSubscription = timer(0, 250).pipe(
+      tap(() => {
+        this.updateTime();
+      })
+    ).subscribe();
+    this.blocksSubscription = this.stateService.blocks$
+      .subscribe(([block]) => {
+        if (block) {
+          this.blockTimes.push([block.height, new Date(block.timestamp * 1000)]);
+          // using block-reported times, so ensure they are sorted chronologically
+          this.blockTimes = this.blockTimes.sort((a, b) => a[1].getTime() - b[1].getTime());
+          this.updateSegments();
+        }
+      });
+  }
+
+  ngOnChanges(): void {
+    this.faceStyle = {
+      width: `${this.size}px`,
+      height: `${this.size}px`,
+    };
+  }
+
+  ngOnDestroy(): void {
+    this.timeSubscription.unsubscribe();
+  }
+
+  updateTime(): void {
+    const now = new Date();
+    const seconds = now.getSeconds() + (now.getMilliseconds() / 1000);
+    this.minutes = (now.getMinutes() + (seconds / 60)) % 60;
+    this.hours = now.getHours() + (this.minutes / 60);
+    this.updateSegments();
+  }
+
+  updateSegments(): void {
+    const now = new Date();
+    this.blockTimes = this.blockTimes.filter(time => (now.getTime() - time[1].getTime()) <= 3600000);
+    const tail = new Date(now.getTime() - 3600000);
+    const hourStart = new Date(now.getFullYear(), now.getMonth(), now.getDate(), now.getHours());
+
+    const times = [
+      ['start', tail],
+      ...this.blockTimes,
+      ['end', now],
+    ];
+    const minuteTimes = times.map(time => {
+      return [time[0], (time[1].getTime() - hourStart.getTime()) / 60000];
+    });
+    this.segments = [];
+    const r = 174;
+    const cx = 192;
+    const cy = cx;
+    for (let i = 1; i < minuteTimes.length; i++) {
+      const arc = this.getArc(minuteTimes[i-1][1], minuteTimes[i][1], r, cx, cy);
+      if (arc) {
+        arc.id = minuteTimes[i][0];
+        this.segments.push(arc);
+      }
+    }
+    const arc = this.getArc(minuteTimes[0][1], minuteTimes[1][1], r, cx, cy);
+    if (arc) {
+      this.dialPath = arc.path;
+    }
+
+    this.cd.markForCheck();
+  }
+
+  getArc(startTime, endTime, r, cx, cy): any {
+    const startDegrees = (startTime + 0.2) * 6;
+      const endDegrees = (endTime - 0.2) * 6;
+      const start = this.getPointOnCircle(startDegrees, r, cx, cy);
+      const end = this.getPointOnCircle(endDegrees, r, cx, cy);
+      const arcLength = endDegrees - startDegrees;
+      // merge gaps and omit lines shorter than 1 degree
+      if (arcLength >= 1) {
+        const path = `M ${start.x} ${start.y} A ${r} ${r} 0 ${arcLength > 180 ? 1 : 0} 1 ${end.x} ${end.y}`;
+        return {
+          path,
+          start,
+          end
+        };
+      } else {
+        return null;
+      }
+  }
+
+  getPointOnCircle(deg, r, cx, cy) {
+    const modDeg = ((deg % 360) + 360) % 360;
+    const rad = (modDeg * Math.PI) / 180;
+    return {
+      x: cx + (r * Math.sin(rad)),
+      y: cy - (r * Math.cos(rad)),
+    };
+  }
+
+  makeTicks() {
+    this.minorTicks = [];
+    this.majorTicks = [];
+    for (let i = 1; i < 60; i++) {
+      if (i % 5 === 0) {
+        this.majorTicks.push(i * 6);
+      } else {
+        this.minorTicks.push(i * 6);
+      }
+    }
+  }
+
+  trackBySegment(index: number, segment) {
+    return segment.id;
+  }
+}

frontend/src/app/components/clock/clock-mempool.component.html

@@ -0,0 +1 @@
+<app-clock mode="mempool"></app-clock>

frontend/src/app/components/clock/clock-mempool.component.ts

@@ -0,0 +1,7 @@
+import { Component } from '@angular/core';
+
+@Component({
+  selector: 'app-clock-mempool',
+  templateUrl: './clock-mempool.component.html',
+})
+export class ClockMempoolComponent {}

frontend/src/app/components/clock/clock-mined.component.html

@@ -0,0 +1 @@
+<app-clock mode="block"></app-clock>

frontend/src/app/components/clock/clock-mined.component.ts

@@ -0,0 +1,7 @@
+import { Component } from '@angular/core';
+
+@Component({
+  selector: 'app-clock-mined',
+  templateUrl: './clock-mined.component.html',
+})
+export class ClockMinedComponent {}

frontend/src/app/components/clock/clock.component.html

@@ -0,0 +1,67 @@
+<div class="clock-wrapper" [style]="wrapperStyle">
+  <div class="clockchain-bar" [style.height]="chainHeight + 'px'">
+    <div class="clockchain">
+      <app-clockchain [width]="chainWidth" [height]="chainHeight" [mode]="mode"></app-clockchain>
+    </div>
+  </div>
+  <div class="clock-face">
+    <app-clock-face [size]="clockSize">
+      <div class="block-wrapper">
+        <ng-container *ngIf="block && block.height >= 0">
+          <ng-container *ngIf="mode === 'block'; else mempoolMode;">
+            <div class="block-cube">
+              <div class="side top"></div>
+              <div class="side bottom"></div>
+              <div class="side right" [style]="blockStyle"></div>
+              <div class="side left" [style]="blockStyle"></div>
+              <div class="side front" [style]="blockStyle"></div>
+              <div class="side back" [style]="blockStyle"></div>
+            </div>
+          </ng-container>
+          <ng-template #mempoolMode>
+            <div class="block-sizer" [style]="blockSizerStyle">
+              <app-mempool-block-overview [index]="0" [pixelAlign]="true"></app-mempool-block-overview>
+            </div>
+          </ng-template>
+          <div class="fader"></div>
+          <div class="title-wrapper">
+            <h1 class="block-height">{{ block.height }}</h1>
+          </div>
+        </ng-container>
+      </div>
+    </app-clock-face>
+  </div>
+  <ng-container *ngIf="!hideStats">
+    <div class="stats top left">
+      <p class="label" i18n="clock.fiat-price">fiat price</p>
+      <p>
+        <app-fiat [value]="100000000" digitsInfo="1.2-2" colorClass="white-color"></app-fiat>
+      </p>
+    </div>
+    <div class="stats top right">
+      <p class="label" i18n="clock.priority-rate|priority fee rate">priority rate</p>
+      <p *ngIf="recommendedFees$ | async as recommendedFees;" i18n="shared.sat-vbyte|sat/vB">{{ recommendedFees.fastestFee + 300 }} sat/vB</p>
+    </div>
+    <div *ngIf="mode !== 'mempool' && block" class="stats bottom left">
+      <p [innerHTML]="block.size | bytes: 2"></p>
+      <p class="label" i18n="clock.block-size">block size</p>
+    </div>
+    <div *ngIf="mode !== 'mempool' && block" class="stats bottom right">
+      <p class="force-wrap">
+        <ng-container *ngTemplateOutlet="block.tx_count === 1 ? transactionsSingular : transactionsPlural; context: {$implicit: block.tx_count | number}"></ng-container>
+        <ng-template #transactionsSingular let-i i18n="shared.transaction-count.singular">{{ i }} <span class="label">transaction</span></ng-template>
+        <ng-template #transactionsPlural let-i i18n="shared.transaction-count.plural">{{ i }} <span class="label">transactions</span></ng-template>
+      </p>
+    </div>
+    <ng-container *ngIf="mempoolInfo$ | async as mempoolInfo;">
+      <div *ngIf="mode === 'mempool'" class="stats bottom left">
+        <p [innerHTML]="mempoolInfo.usage | bytes: 0"></p>
+        <p class="label" i18n="dashboard.memory-usage|Memory usage">memory usage</p>
+      </div>
+      <div *ngIf="mode === 'mempool'" class="stats bottom right">
+        <p>{{ mempoolInfo.size | number }}</p>
+        <p class="label" i18n="dashboard.unconfirmed|Unconfirmed count">unconfirmed</p>
+      </div>
+    </ng-container>
+  </ng-container>
+</div>

frontend/src/app/components/clock/clock.component.scss

@@ -0,0 +1,190 @@
+.clock-wrapper {
+  position: absolute;
+  left: 0;
+  right: 0;
+  top: 0;
+  bottom: 0;
+  width: 100%;
+  height: 100%;
+  display: flex;
+  flex-direction: column;
+  justify-content: flex-start;
+
+  --chain-height: 60px;
+  --clock-width: 300px;
+
+  .clockchain-bar, .clock-face {
+    flex-shrink: 0;
+    flex-grow: 0;
+  }
+
+  .clockchain-bar {
+    position: relative;
+    width: 100%;
+    height: 15.625%;
+    z-index: 2;
+    // overflow: hidden;
+    // background: #1d1f31;
+    // box-shadow: 0 0 15px #000;
+  }
+
+  .clock-face {
+    position: relative;
+    height: 84.375%;
+    margin: auto;
+    overflow: hidden;
+    display: flex;
+    justify-content: center;
+    align-items: center;
+    z-index: 1;
+  }
+
+  .stats {
+    position: absolute;
+    z-index: 3;
+
+    p {
+      margin: 0;
+      font-size: calc(0.055 * var(--clock-width));
+      line-height: calc(0.05 * var(--clock-width));
+      opacity: 0.8;
+
+      &.force-wrap {
+        word-spacing: 10000px;
+      }
+
+      ::ng-deep .symbol {
+        font-size: inherit;
+        color: white;
+      }
+    }
+
+    .label {
+      font-size: calc(0.04 * var(--clock-width));
+      line-height: calc(0.05 * var(--clock-width));
+    }
+
+    &.top {
+      top: calc(var(--chain-height) + 2%);
+    }
+    &.bottom {
+      bottom: 2%;
+    }
+    &.left {
+      left: 5%;
+    }
+    &.right {
+      right: 5%;
+      text-align: end;
+      text-align: right;
+    }
+  }
+}
+
+.title-wrapper {
+  position: absolute;
+  left: 0;
+  right: 0;
+  top: 0;
+  bottom: 0;
+  width: 100%;
+  height: 100%;
+  display: flex;
+  flex-direction: row;
+  align-items: center;
+  justify-content: center;
+
+  .block-height {
+    font-size: calc(0.2 * var(--clock-width));
+    padding: 0;
+    margin: 0;
+    background: radial-gradient(rgba(0,0,0,0.5), transparent 67%);
+    padding: calc(0.05 * var(--clock-width)) calc(0.15 * var(--clock-width));
+  }
+}
+
+.block-wrapper {
+  position: absolute;
+  left: 0;
+  right: 0;
+  top: 0;
+  bottom: 0;
+  width: 100%;
+  height: 100%;
+
+  .block-sizer {
+    position: absolute;
+    left: 0;
+    top: 0;
+    width: 100%;
+    height: 100%;
+  }
+
+  .fader {
+    position: absolute;
+    left: 0;
+    right: 0;
+    top: 0;
+    bottom: 0;
+    background: radial-gradient(transparent 0%, transparent 44%, #11131f 58%, #11131f 100%);
+  }
+
+  .block-cube {
+    --side-width: calc(0.4 * var(--clock-width));
+    --half-side: calc(0.2 * var(--clock-width));
+    --neg-half-side: calc(-0.2 * var(--clock-width));
+    transform-style: preserve-3d;
+    animation: block-spin 60s infinite linear;
+    position: absolute;
+    z-index: -1;
+    top: 50%;
+    left: 50%;
+    transform: translate(-50%, -50%);
+    width: var(--side-width);
+    height: var(--side-width);
+
+    .side {
+      width: var(--side-width);
+      height: var(--side-width);
+      line-height: 100px;
+      text-align: center;
+      background: #232838;
+      display: block;
+      position: absolute;
+    }
+
+    .side.top {
+      transform: rotateX(90deg); 
+      margin-top: var(--neg-half-side);
+    }
+
+    .side.bottom {
+      background: #105fb0;
+      transform: rotateX(-90deg); 
+      margin-top: var(--half-side);
+    }
+
+    .side.right {
+      transform: rotateY(90deg); 
+      margin-left: var(--half-side);
+    }
+
+    .side.left {
+      transform: rotateY(-90deg); 
+      margin-left: var(--neg-half-side);
+    }
+
+    .side.front {
+      transform: translateZ(var(--half-side));
+    }
+
+    .side.back {
+      transform: translateZ(var(--neg-half-side));
+    }
+  }
+}
+
+@keyframes block-spin {
+  0% {transform: translate(-50%, -50%) rotateX(-20deg) rotateY(0deg);}
+  100% {transform: translate(-50%, -50%) rotateX(-20deg) rotateY(-360deg);}
+}

frontend/src/app/components/clock/clock.component.ts

@@ -0,0 +1,105 @@
+import { ChangeDetectionStrategy, ChangeDetectorRef, Component, HostListener, Input, OnInit } from '@angular/core';
+import { Observable, Subscription } from 'rxjs';
+import { StateService } from '../../services/state.service';
+import { BlockExtended } from '../../interfaces/node-api.interface';
+import { WebsocketService } from '../../services/websocket.service';
+import { MempoolInfo, Recommendedfees } from '../../interfaces/websocket.interface';
+import { ActivatedRoute } from '@angular/router';
+
+@Component({
+  selector: 'app-clock',
+  templateUrl: './clock.component.html',
+  styleUrls: ['./clock.component.scss'],
+  changeDetection: ChangeDetectionStrategy.OnPush,
+})
+export class ClockComponent implements OnInit {
+  @Input() mode: 'block' | 'mempool' = 'block';
+  hideStats: boolean = false;
+  blocksSubscription: Subscription;
+  recommendedFees$: Observable<Recommendedfees>;
+  mempoolInfo$: Observable<MempoolInfo>;
+  block: BlockExtended;
+  clockSize: number = 300;
+  chainWidth: number = 384;
+  chainHeight: number = 60;
+  blockStyle;
+  blockSizerStyle;
+  wrapperStyle;
+  limitWidth: number;
+  limitHeight: number;
+
+  gradientColors = {
+    '': ['#9339f4', '#105fb0'],
+    bisq: ['#9339f4', '#105fb0'],
+    liquid: ['#116761', '#183550'],
+    'liquidtestnet': ['#494a4a', '#272e46'],
+    testnet: ['#1d486f', '#183550'],
+    signet: ['#6f1d5d', '#471850'],
+  };
+
+  constructor(
+    public stateService: StateService,
+    private websocketService: WebsocketService,
+    private route: ActivatedRoute,
+    private cd: ChangeDetectorRef,
+  ) {
+    this.route.queryParams.subscribe((params) => {
+      this.hideStats = params && params.stats === 'false';
+      this.limitWidth = Number.parseInt(params.width) || null;
+      this.limitHeight = Number.parseInt(params.height) || null;
+    });
+  }
+
+  ngOnInit(): void {
+    this.resizeCanvas();
+    this.websocketService.want(['blocks']);
+
+    this.blocksSubscription = this.stateService.blocks$
+      .subscribe(([block]) => {
+        if (block) {
+          this.block = block;
+          this.blockStyle = this.getStyleForBlock(this.block);
+          this.cd.markForCheck();
+        }
+      });
+
+    this.recommendedFees$ = this.stateService.recommendedFees$;
+    this.mempoolInfo$ = this.stateService.mempoolInfo$;
+  }
+
+  getStyleForBlock(block: BlockExtended) {
+    const greenBackgroundHeight = 100 - (block.weight / this.stateService.env.BLOCK_WEIGHT_UNITS) * 100;
+
+    return {
+      background: `repeating-linear-gradient(
+        #2d3348,
+        #2d3348 ${greenBackgroundHeight}%,
+        ${this.gradientColors[''][0]} ${Math.max(greenBackgroundHeight, 0)}%,
+        ${this.gradientColors[''][1]} 100%
+      )`,
+    };
+  }
+  
+  @HostListener('window:resize', ['$event'])
+  resizeCanvas(): void {
+    const windowWidth = this.limitWidth || window.innerWidth;
+    const windowHeight = this.limitHeight || window.innerHeight;
+    this.chainWidth = windowWidth;
+    this.chainHeight = Math.max(60, windowHeight / 8);
+    this.clockSize = Math.min(800, windowWidth, windowHeight - (1.4 * this.chainHeight));
+    const size = Math.ceil(this.clockSize / 75) * 75;
+    const margin = (this.clockSize - size) / 2;
+    this.blockSizerStyle = {
+      transform: `translate(${margin}px, ${margin}px)`,
+      width: `${size}px`,
+      height: `${size}px`,
+    };
+    this.wrapperStyle = {
+      '--clock-width': `${this.clockSize}px`,
+      '--chain-height': `${this.chainHeight}px`,
+      'width': this.limitWidth ? `${this.limitWidth}px` : undefined,
+      'height': this.limitHeight ? `${this.limitHeight}px` : undefined,
+    };
+    this.cd.markForCheck();
+  }
+}

frontend/src/app/components/clockchain/clockchain.component.html

@@ -0,0 +1,28 @@
+<div
+  class="text-center" class="blockchain-wrapper" [class.time-ltr]="timeLtr" #container
+  [class.ltr-transition]="ltrTransitionEnabled" [style.width]="width + 'px'" [style.height]="height + 'px'"
+>
+  <div class="position-container" [ngClass]="network ? network : ''" [style.top]="(height / 3) + 'px'">
+    <span>
+      <div class="blocks-wrapper">
+        <app-mempool-blocks [minimal]="true" [count]="mempoolBlocks" [blockWidth]="blockWidth" [spotlight]="mode === 'mempool' ? 1 : 0"></app-mempool-blocks>
+        <app-blockchain-blocks [minimal]="true" [count]="blockchainBlocks" [blockWidth]="blockWidth" [spotlight]="mode === 'block' ? -1 : 0"></app-blockchain-blocks>
+      </div>
+      <div class="divider" [style.top]="-(height / 6) + 'px'">
+        <svg
+          viewBox="0 0 2 175"
+          [style.width]="'2px'"
+          [style.height]="(5 * height / 6) + 'px'"
+        >
+          <line
+            class="divider-line"
+            x0="0"
+            x1="0"
+            y0="0"
+            y1="175px"
+          ></line>
+        </svg>
+      </div>
+    </span>
+  </div>
+</div>

frontend/src/app/components/clockchain/clockchain.component.scss

@@ -0,0 +1,94 @@
+.divider {
+  position: absolute;
+  left: -0.5px;
+  top: 0;
+  .divider-line {
+    stroke: white;
+    stroke-width: 4px;
+    stroke-linecap: butt;
+    stroke-dasharray: 25px 25px;
+  }
+}
+
+.blockchain-wrapper {
+  height: 100%;
+
+  -webkit-user-select: none; /* Safari */
+  -moz-user-select: none; /* Firefox */
+  -ms-user-select: none; /* IE10+/Edge */
+  user-select: none; /* Standard */
+}
+
+.position-container {
+  position: absolute;
+  left: 50%;
+  top: 0;
+}
+
+.black-background {
+  background-color: #11131f;
+  z-index: 100;
+  position: relative;
+}
+
+.scroll-spacer {
+  position: absolute;
+  top: 0;
+  left: 0;
+  width: 1px;
+  height: 1px;
+  pointer-events: none;
+}
+
+.loading-block {
+  position: absolute;
+  text-align: center;
+  margin: auto;
+  width: 300px;
+  left: -150px;
+  top: 0px;
+}
+
+.time-toggle {
+  color: white;
+  font-size: 0.8rem;
+  position: absolute;
+  bottom: -1.8em;
+  left: 1px;
+  transform: translateX(-50%);
+  background: none;
+  border: none;
+  outline: none;
+  margin: 0;
+  padding: 0;
+}
+
+.blockchain-wrapper.ltr-transition .blocks-wrapper,
+.blockchain-wrapper.ltr-transition .position-container,
+.blockchain-wrapper.ltr-transition .time-toggle {
+  transition: transform 1s;
+}
+
+.blockchain-wrapper.time-ltr {
+  .blocks-wrapper {
+    transform: scaleX(-1);
+  }
+
+  .time-toggle {
+    transform: translateX(-50%) scaleX(-1);
+  }
+}
+
+:host-context(.ltr-layout) {
+  .blockchain-wrapper.time-ltr .blocks-wrapper,
+  .blockchain-wrapper .blocks-wrapper {
+    direction: ltr;
+  }
+}
+
+:host-context(.rtl-layout) {
+  .blockchain-wrapper.time-ltr .blocks-wrapper,
+  .blockchain-wrapper .blocks-wrapper {
+    direction: rtl;
+  }
+}

frontend/src/app/components/clockchain/clockchain.component.ts

@@ -0,0 +1,73 @@
+import { Component, OnInit, OnDestroy, ChangeDetectionStrategy, Input, OnChanges, ChangeDetectorRef } from '@angular/core';
+import { firstValueFrom, Subscription } from 'rxjs';
+import { StateService } from '../../services/state.service';
+
+@Component({
+  selector: 'app-clockchain',
+  templateUrl: './clockchain.component.html',
+  styleUrls: ['./clockchain.component.scss'],
+  changeDetection: ChangeDetectionStrategy.OnPush,
+})
+export class ClockchainComponent implements OnInit, OnChanges, OnDestroy {
+  @Input() width: number = 300;
+  @Input() height: number = 60;
+  @Input() mode: 'mempool' | 'block';
+
+  mempoolBlocks: number = 3;
+  blockchainBlocks: number = 6;
+  blockWidth: number = 50;
+  dividerStyle;
+
+  network: string;
+  timeLtrSubscription: Subscription;
+  timeLtr: boolean = this.stateService.timeLtr.value;
+  ltrTransitionEnabled = false;
+  connectionStateSubscription: Subscription;
+  loadingTip: boolean = true;
+  connected: boolean = true;
+
+  constructor(
+    public stateService: StateService,
+    private cd: ChangeDetectorRef,
+  ) {}
+
+  ngOnInit() {
+    this.ngOnChanges();
+
+    this.network = this.stateService.network;
+    this.timeLtrSubscription = this.stateService.timeLtr.subscribe((ltr) => {
+      this.timeLtr = !!ltr;
+    });
+    this.connectionStateSubscription = this.stateService.connectionState$.subscribe(state => {
+      this.connected = (state === 2);
+    });
+    firstValueFrom(this.stateService.chainTip$).then(() => {
+      this.loadingTip = false;
+    });
+  }
+
+  ngOnChanges() {
+    this.blockWidth = Math.floor(7 * this.height / 12);
+    this.mempoolBlocks = Math.floor(((this.width / 2) - (this.blockWidth * 0.32)) / (1.24 * this.blockWidth));
+    this.blockchainBlocks = this.mempoolBlocks;
+    this.dividerStyle = {
+      width: '2px',
+      height: `${this.height}px`,
+    };
+    this.cd.markForCheck();
+  }
+
+  ngOnDestroy() {
+    this.timeLtrSubscription.unsubscribe();
+    this.connectionStateSubscription.unsubscribe();
+  }
+
+  trackByPageFn(index: number, item: { index: number }) {
+    return item.index;
+  }
+
+  toggleTimeDirection() {
+    this.ltrTransitionEnabled = true;
+    this.stateService.timeLtr.next(!this.timeLtr);
+  }
+}

frontend/src/app/components/difficulty-adjustments-table/difficulty-adjustments-table.component.html

@@ -14,7 +14,7 @@
           <a [routerLink]="['/block' | relativeUrl, diffChange.height]">{{ diffChange.height }}</a>
         </td>
         <td class="date text-left">
-          <app-time kind="since" [time]="diffChange.timestamp" [fastRender]="true"></app-time>
+          <app-time kind="since" [time]="diffChange.timestamp" [fastRender]="true" [precision]="1"></app-time>
         </td>
         <td class="text-right">{{ diffChange.difficultyShorten }}</td>
         <td class="text-right" [style]="diffChange.change >= 0 ? 'color: #42B747' : 'color: #B74242'">

frontend/src/app/components/difficulty-mining/difficulty-mining.component.html

@@ -10,7 +10,7 @@
             <ng-template #blocksPlural let-i i18n="shared.blocks">{{ i }} <span class="shared-block">blocks</span></ng-template>
             <ng-template #blocksSingular let-i i18n="shared.block">{{ i }} <span class="shared-block">block</span></ng-template>
           </div>
-          <div class="symbol"><app-time kind="until" [time]="epochData.estimatedRetargetDate" [fastRender]="true"></app-time></div>
+          <div class="symbol"><app-time kind="until" [time]="epochData.estimatedRetargetDate" [fastRender]="true" [precision]="1"></app-time></div>
         </div>
         <div class="item">
           <h5 class="card-title" i18n="difficulty-box.estimate">Estimate</h5>
@@ -54,7 +54,7 @@
             <ng-template #blocksPlural let-i i18n="shared.blocks">{{ i }} <span class="shared-block">blocks</span></ng-template>
             <ng-template #blocksSingular let-i i18n="shared.block">{{ i }} <span class="shared-block">block</span></ng-template>
           </div>
-          <div class="symbol"><app-time kind="until" [time]="epochData.timeUntilHalving" [fastRender]="true"></app-time></div>
+          <div class="symbol"><app-time kind="until" [time]="epochData.timeUntilHalving" [fastRender]="true" [precision]="1"></app-time></div>
         </div>
       </div>
     </div>

frontend/src/app/components/difficulty/difficulty.component.html

@@ -37,7 +37,7 @@
         <div class="difficulty-stats">
           <div class="item">
             <div class="card-text">
-              ~<app-time [time]="epochData.timeAvg / 1000" [forceFloorOnTimeIntervals]="['minute']" [fractionDigits]="1"></app-time>
+              ~<app-time [time]="epochData.timeAvg / 1000" [fractionDigits]="1"></app-time>
             </div>
             <div class="symbol" i18n="difficulty-box.average-block-time">Average block time</div>
           </div>
@@ -68,7 +68,7 @@
             </div>
           </div>
           <div class="item">
-            <div class="card-text"><app-time kind="until" [time]="epochData.estimatedRetargetDate" [fastRender]="true"></app-time></div>
+            <div class="card-text"><app-time kind="until" [time]="epochData.estimatedRetargetDate" [fastRender]="true" [precision]="1"></app-time></div>
             <div class="symbol">
               {{ epochData.retargetDateString }}
             </div>

frontend/src/app/components/hashrate-chart/hashrate-chart.component.scss

@@ -4,6 +4,9 @@
   @media (min-width: 465px) {
     font-size: 20px;
   }
+  @media (min-width: 992px) {
+    height: 40px;
+  }
 }
 
 .main-title {
@@ -18,16 +21,19 @@
 }
 
 .full-container {
+  display: flex;
+  flex-direction: column;
   padding: 0px 15px;
   width: 100%;
-  min-height: 500px;
+  height: calc(100vh - 250px);
-  height: calc(100% - 150px);
+  @media (min-width: 992px) {
-  @media (max-width: 992px) {
+    height: calc(100vh - 150px);
-    padding-bottom: 100px;
+  }
-  };
 }
 
 .chart {
+  display: flex;
+  flex: 1;
   width: 100%;
   height: 100%;
   padding-bottom: 20px;

frontend/src/app/components/hashrates-chart-pools/hashrate-chart-pools.component.scss

@@ -4,6 +4,9 @@
   @media (min-width: 465px) {
     font-size: 20px;
   }
+  @media (min-width: 992px) {
+    height: 40px;
+  }
 }
 
 .main-title {
@@ -18,18 +21,20 @@
 }
 
 .full-container {
+  display: flex;
+  flex-direction: column;
   padding: 0px 15px;
   width: 100%;
-  min-height: 500px;
+  height: calc(100vh - 250px);
-  height: calc(100% - 150px);
+  @media (min-width: 992px) {
-  @media (max-width: 992px) {
+    height: calc(100vh - 150px);
-    padding-bottom: 100px;
+  }
-  };
 }
 
 .chart {
+  display: flex;
+  flex: 1;
   width: 100%;
-  height: 100%;
   padding-bottom: 20px;
   padding-right: 10px;
   @media (max-width: 992px) {

frontend/src/app/components/liquid-master-page/liquid-master-page.component.html

@@ -90,9 +90,12 @@
 </nav>
 </header>
 
+<app-testnet-alert *ngIf="network.val === 'liquidtestnet'"></app-testnet-alert>
+
 <br />
 
 <router-outlet></router-outlet>
 
-<br>
+<app-global-footer></app-global-footer>
+
 </ng-container>

frontend/src/app/components/master-page/master-page.component.html

@@ -62,10 +62,11 @@
 </nav>
 </header>
 
-<br />
+<app-testnet-alert *ngIf="network.val === 'testnet' || network.val === 'signet'"></app-testnet-alert>
 
-<router-outlet></router-outlet>
+<main style="margin-top: 24px;">
-
+  <router-outlet></router-outlet>
-<br>
+</main>
 
+<app-global-footer></app-global-footer>
 </ng-container>

frontend/src/app/components/master-page/master-page.component.scss

@@ -192,4 +192,4 @@ nav {
     margin: 33px 0px 0px -19px;
     font-size: 7px;
   }
-}
+}

frontend/src/app/components/master-page/master-page.component.ts

@@ -1,4 +1,4 @@
-import { Component, Inject, OnInit } from '@angular/core';
+import { Component, OnInit } from '@angular/core';
 import { Env, StateService } from '../../services/state.service';
 import { Observable, merge, of } from 'rxjs';
 import { LanguageService } from '../../services/language.service';

frontend/src/app/components/mempool-block-overview/mempool-block-overview.component.html

@@ -5,5 +5,6 @@
   [blockLimit]="stateService.blockVSize"
   [orientation]="timeLtr ? 'right' : 'left'"
   [flip]="true"
+  [pixelAlign]="pixelAlign"
   (txClickEvent)="onTxClick($event)"
 ></app-block-overview-graph>

frontend/src/app/components/mempool-block-overview/mempool-block-overview.component.ts

@@ -16,6 +16,7 @@ import { Router } from '@angular/router';
 })
 export class MempoolBlockOverviewComponent implements OnInit, OnDestroy, OnChanges, AfterViewInit {
   @Input() index: number;
+  @Input() pixelAlign: boolean = false;
   @Output() txPreviewEvent = new EventEmitter<TransactionStripped | void>();
 
   @ViewChild('blockGraph') blockGraph: BlockOverviewGraphComponent;
@@ -99,7 +100,7 @@ export class MempoolBlockOverviewComponent implements OnInit, OnDestroy, OnChang
       const direction = (this.blockIndex == null || this.index < this.blockIndex) ? this.poolDirection : this.chainDirection;
       this.blockGraph.replace(delta.added, direction);
     } else {
-      this.blockGraph.update(delta.added, delta.removed, blockMined ? this.chainDirection : this.poolDirection, blockMined);
+      this.blockGraph.update(delta.added, delta.removed, delta.changed || [], blockMined ? this.chainDirection : this.poolDirection, blockMined);
     }
 
     this.lastBlockHeight = this.stateService.latestBlockHeight;
@@ -107,8 +108,12 @@ export class MempoolBlockOverviewComponent implements OnInit, OnDestroy, OnChang
     this.isLoading$.next(false);
   }
 
-  onTxClick(event: TransactionStripped): void {
+  onTxClick(event: { tx: TransactionStripped, keyModifier: boolean }): void {
-    const url = new RelativeUrlPipe(this.stateService).transform(`/tx/${event.txid}`);
+    const url = new RelativeUrlPipe(this.stateService).transform(`/tx/${event.tx.txid}`);
-    this.router.navigate([url]);
+    if (!event.keyModifier) {
+      this.router.navigate([url]);
+    } else {
+      window.open(url, '_blank');
+    }
   }
 }

frontend/src/app/components/mempool-blocks/mempool-blocks.component.html

@@ -1,40 +1,47 @@
-<ng-container *ngIf="(loadingBlocks$ | async) === false; else loadingBlocks">
+<ng-container *ngIf="(loadingBlocks$ | async) === false; else loadingBlocks" [class.minimal]="minimal">
-  <div class="mempool-blocks-container" [class.time-ltr]="timeLtr" *ngIf="(difficultyAdjustments$ | async) as da;">
+  <div class="mempool-blocks-container" [class.time-ltr]="timeLtr" [style.--block-size]="blockWidth+'px'" *ngIf="(difficultyAdjustments$ | async) as da;">
     <div class="flashing">
       <ng-template ngFor let-projectedBlock [ngForOf]="mempoolBlocks$ | async" let-i="index" [ngForTrackBy]="trackByFn">
-        <div @blockEntryTrigger [@.disabled]="!animateEntry" [attr.data-cy]="'mempool-block-' + i" class="bitcoin-block text-center mempool-block" id="mempool-block-{{ i }}" [ngStyle]="mempoolBlockStyles[i]" [class.blink-bg]="projectedBlock.blink">
+        <div
+          *ngIf="minimal && spotlight > 0 && spotlight === i + 1"
+          class="spotlight-bottom"
+          [style.right]="mempoolBlockStyles[i].right"
+        ></div>
+        <div @blockEntryTrigger [@.disabled]="i > 0 || !animateEntry" [attr.data-cy]="'mempool-block-' + i" class="bitcoin-block text-center mempool-block" [class.hide-block]="count && i >= count" id="mempool-block-{{ i }}" [ngStyle]="mempoolBlockStyles[i]" [class.blink-bg]="projectedBlock.blink">
           <a draggable="false" [routerLink]="['/mempool-block/' | relativeUrl, i]"
             class="blockLink" [ngClass]="{'disabled': (this.stateService.blockScrolling$ | async)}">&nbsp;</a>
           <div class="block-body">
-            <div [attr.data-cy]="'mempool-block-' + i + '-fees'" class="fees">
+            <ng-container *ngIf="!minimal">
-              ~{{ projectedBlock.medianFee | number:feeRounding }} <span i18n="shared.sat-vbyte|sat/vB">sat/vB</span>
+              <div [attr.data-cy]="'mempool-block-' + i + '-fees'" class="fees">
-            </div>
+                ~{{ projectedBlock.medianFee | number:feeRounding }} <span i18n="shared.sat-vbyte|sat/vB">sat/vB</span>
-            <div [attr.data-cy]="'mempool-block-' + i + '-fee-span'" class="fee-span">
-              {{ projectedBlock.feeRange[0] | number:feeRounding }} - {{ projectedBlock.feeRange[projectedBlock.feeRange.length - 1] | number:feeRounding }} <span i18n="shared.sat-vbyte|sat/vB">sat/vB</span>
-            </div>
-            <div *ngIf="showMiningInfo" class="block-size">
-              <app-amount [attr.data-cy]="'mempool-block-' + i + '-total-fees'" [satoshis]="projectedBlock.totalFees" digitsInfo="1.2-3" [noFiat]="true"></app-amount>
-            </div>
-            <div *ngIf="!showMiningInfo" class="block-size" [innerHTML]="'&lrm;' + (projectedBlock.blockSize | bytes: 2)"></div>
-            <div [attr.data-cy]="'mempool-block-' + i + '-transaction-count'" class="transaction-count">
-              <ng-container *ngTemplateOutlet="projectedBlock.nTx === 1 ? transactionsSingular : transactionsPlural; context: {$implicit: projectedBlock.nTx | number}"></ng-container>
-              <ng-template #transactionsSingular let-i i18n="shared.transaction-count.singular">{{ i }} transaction</ng-template>
-              <ng-template #transactionsPlural let-i i18n="shared.transaction-count.plural">{{ i }} transactions</ng-template>
-            </div>
-            <div [attr.data-cy]="'mempool-block-' + i + '-time'" class="time-difference" *ngIf="projectedBlock.blockVSize <= stateService.blockVSize; else mergedBlock">
-              <ng-template [ngIf]="network === 'liquid' || network === 'liquidtestnet'" [ngIfElse]="timeDiffMainnet">
-                <app-time kind="until" [time]="(1 * i) + now + 61000" [fastRender]="false" [fixedRender]="true"></app-time>
-              </ng-template>
-              <ng-template #timeDiffMainnet>
-                <app-time kind="until" [time]="da.timeAvg * (i + 1) + now + da.timeOffset" [fastRender]="false" [fixedRender]="true" [forceFloorOnTimeIntervals]="['hour']"></app-time>
-              </ng-template>
-            </div>
-            <ng-template #mergedBlock>
-              <div [attr.data-cy]="'mempool-block-' + i + '-blocks'" class="time-difference">
-                <b>(<ng-container *ngTemplateOutlet="blocksPlural; context: {$implicit: projectedBlock.blockVSize / stateService.blockVSize | ceil }"></ng-container>)</b>
-                <ng-template #blocksPlural let-i i18n="shared.blocks">{{ i }} <span class="shared-block">blocks</span></ng-template>
               </div>
-            </ng-template>
+              <div [attr.data-cy]="'mempool-block-' + i + '-fee-span'" class="fee-span">
+                {{ projectedBlock.feeRange[0] | number:feeRounding }} - {{ projectedBlock.feeRange[projectedBlock.feeRange.length - 1] | number:feeRounding }} <span i18n="shared.sat-vbyte|sat/vB">sat/vB</span>
+              </div>
+              <div *ngIf="showMiningInfo" class="block-size">
+                <app-amount [attr.data-cy]="'mempool-block-' + i + '-total-fees'" [satoshis]="projectedBlock.totalFees" digitsInfo="1.2-3" [noFiat]="true"></app-amount>
+              </div>
+              <div *ngIf="!showMiningInfo" class="block-size" [innerHTML]="'&lrm;' + (projectedBlock.blockSize | bytes: 2)"></div>
+              <div [attr.data-cy]="'mempool-block-' + i + '-transaction-count'" class="transaction-count">
+                <ng-container *ngTemplateOutlet="projectedBlock.nTx === 1 ? transactionsSingular : transactionsPlural; context: {$implicit: projectedBlock.nTx | number}"></ng-container>
+                <ng-template #transactionsSingular let-i i18n="shared.transaction-count.singular">{{ i }} transaction</ng-template>
+                <ng-template #transactionsPlural let-i i18n="shared.transaction-count.plural">{{ i }} transactions</ng-template>
+              </div>
+              <div [attr.data-cy]="'mempool-block-' + i + '-time'" class="time-difference" *ngIf="projectedBlock.blockVSize <= stateService.blockVSize; else mergedBlock">
+                <ng-template [ngIf]="network === 'liquid' || network === 'liquidtestnet'" [ngIfElse]="timeDiffMainnet">
+                  <app-time kind="until" [time]="(1 * i) + now + 61000" [fastRender]="false" [fixedRender]="true"></app-time>
+                </ng-template>
+                <ng-template #timeDiffMainnet>
+                  <app-time kind="until" [time]="da.timeAvg * (i + 1) + now + da.timeOffset" [fastRender]="false" [fixedRender]="true"></app-time>
+                </ng-template>
+              </div>
+              <ng-template #mergedBlock>
+                <div [attr.data-cy]="'mempool-block-' + i + '-blocks'" class="time-difference">
+                  <b>(<ng-container *ngTemplateOutlet="blocksPlural; context: {$implicit: projectedBlock.blockVSize / stateService.blockVSize | ceil }"></ng-container>)</b>
+                  <ng-template #blocksPlural let-i i18n="shared.blocks">{{ i }} <span class="shared-block">blocks</span></ng-template>
+                </div>
+              </ng-template>
+            </ng-container>
           </div>
           <span class="animated-border"></span>
         </div>
@@ -45,10 +52,10 @@
 </ng-container>
 
 <ng-template #loadingBlocks>
-  <div class="mempool-blocks-container" [class.time-ltr]="timeLtr">
+  <div class="mempool-blocks-container" [class.time-ltr]="timeLtr" [style.--block-size]="blockWidth+'px'">
     <div class="flashing">
       <ng-template ngFor let-projectedBlock [ngForOf]="mempoolEmptyBlocks" let-i="index" [ngForTrackBy]="trackByFn">
-        <div class="bitcoin-block text-center mempool-block" id="mempool-block-{{ i }}" [ngStyle]="mempoolEmptyBlockStyles[i]"></div>
+        <div class="bitcoin-block text-center mempool-block" [class.hide-block]="count && i >= count" id="mempool-block-{{ i }}" [ngStyle]="mempoolEmptyBlockStyles[i]"></div>
       </ng-template>
     </div>
   </div>

frontend/src/app/components/mempool-blocks/mempool-blocks.component.scss

@@ -1,7 +1,7 @@
 .bitcoin-block {
-  width: 125px;
+  width: var(--block-size);
-  height: 125px;
+  height: var(--block-size);
-  transition: background 2s, right 2s, transform 1s;
+  transition: background 2s, right 2s, transform 1s, opacity 1s;
 }
 
 .block-size {
@@ -14,6 +14,7 @@
   top: 0px;
   right: 0px;
   left: 0px;
+  --block-size: 125px;
 }
 
 .flashing {
@@ -66,11 +67,11 @@
 
 .bitcoin-block::after {
   content: '';
-  width: 125px;
+  width: var(--block-size);
-  height: 24px;
+  height: calc(0.192 * var(--block-size));
   position:absolute;
-  top: -24px;
+  top: calc(-0.192 * var(--block-size));
-  left: -20px;
+  left: calc(-0.16 * var(--block-size));
   background-color: #232838;
   transform:skew(40deg);
   transform-origin:top;
@@ -79,11 +80,11 @@
 
 .bitcoin-block::before {
   content: '';
-  width: 20px;
+  width: calc(0.16 * var(--block-size));
-  height: 125px;
+  height: var(--block-size);
   position: absolute;
-  top: -12px;
+  top: calc(-0.096 * var(--block-size));
-  left: -20px;
+  left: calc(-0.16 * var(--block-size));
   background-color: #191c27;
   z-index: -1;
 
@@ -100,6 +101,10 @@
   background-color: #2d2825;
 }
 
+.mempool-block.hide-block {
+  opacity: 0;
+}
+
 .black-background {
   background-color: #11131f;
   z-index: 100;
@@ -141,7 +146,7 @@
 
   .bitcoin-block::before {
     transform: skewY(-50deg);
-    left: 125px;
+    left: var(--block-size);
   }
   .block-body {
     transform: scaleX(-1);
@@ -152,4 +157,16 @@
   #arrow-up {
     transform: translateX(70px);
   }
+}
+
+.spotlight-bottom {
+  position: absolute;
+  width: calc(0.6 * var(--block-size));
+  height: calc(0.25 * var(--block-size));
+  border-left: solid calc(0.3 * var(--block-size)) transparent;
+  border-bottom: solid calc(0.3 * var(--block-size)) white;
+  border-right: solid calc(0.3 * var(--block-size)) transparent;
+  transform: translate(calc(-0.2 * var(--block-size)), calc(1.1 * var(--block-size)));
+  border-radius: 2px;
+  z-index: -1;
 }

frontend/src/app/components/mempool-blocks/mempool-blocks.component.ts

@@ -1,4 +1,4 @@
-import { Component, OnInit, OnDestroy, ChangeDetectionStrategy, ChangeDetectorRef } from '@angular/core';
+import { Component, OnInit, OnDestroy, ChangeDetectionStrategy, ChangeDetectorRef, HostListener, Input, OnChanges, SimpleChanges } from '@angular/core';
 import { Subscription, Observable, fromEvent, merge, of, combineLatest } from 'rxjs';
 import { MempoolBlock } from '../../interfaces/websocket.interface';
 import { StateService } from '../../services/state.service';
@@ -8,7 +8,7 @@ import { feeLevels, mempoolFeeColors } from '../../app.constants';
 import { specialBlocks } from '../../app.constants';
 import { RelativeUrlPipe } from '../../shared/pipes/relative-url/relative-url.pipe';
 import { Location } from '@angular/common';
-import { DifficultyAdjustment } from '../../interfaces/node-api.interface';
+import { DifficultyAdjustment, MempoolPosition } from '../../interfaces/node-api.interface';
 import { animate, style, transition, trigger } from '@angular/animations';
 
 @Component({
@@ -23,7 +23,12 @@ import { animate, style, transition, trigger } from '@angular/animations';
   ])],
   changeDetection: ChangeDetectionStrategy.OnPush,
 })
-export class MempoolBlocksComponent implements OnInit, OnDestroy {
+export class MempoolBlocksComponent implements OnInit, OnChanges, OnDestroy {
+  @Input() minimal: boolean = false;
+  @Input() blockWidth: number = 125;
+  @Input() count: number = null;
+  @Input() spotlight: number = 0;
+
   specialBlocks = specialBlocks;
   mempoolBlocks: MempoolBlock[] = [];
   mempoolEmptyBlocks: MempoolBlock[] = this.mountEmptyBlocks();
@@ -48,8 +53,9 @@ export class MempoolBlocksComponent implements OnInit, OnDestroy {
   timeLtr: boolean;
   animateEntry: boolean = false;
 
-  blockWidth = 125;
+  blockOffset: number = 155;
-  blockPadding = 30;
+  blockPadding: number = 30;
+  containerOffset: number = 40;
   arrowVisible = false;
   tabHidden = false;
   feeRounding = '1.0-0';
@@ -58,6 +64,7 @@ export class MempoolBlocksComponent implements OnInit, OnDestroy {
   transition = 'background 2s, right 2s, transform 1s';
 
   markIndex: number;
+  txPosition: MempoolPosition;
   txFeePerVSize: number;
 
   resetTransitionTimeout: number;
@@ -152,10 +159,14 @@ export class MempoolBlocksComponent implements OnInit, OnDestroy {
     this.markBlocksSubscription = this.stateService.markBlock$
       .subscribe((state) => {
         this.markIndex = undefined;
+        this.txPosition = undefined;
         this.txFeePerVSize = undefined;
         if (state.mempoolBlockIndex !== undefined) {
           this.markIndex = state.mempoolBlockIndex;
         }
+        if (state.mempoolPosition) {
+          this.txPosition = state.mempoolPosition;
+        }
         if (state.txFeePerVSize) {
           this.txFeePerVSize = state.txFeePerVSize;
         }
@@ -213,6 +224,14 @@ export class MempoolBlocksComponent implements OnInit, OnDestroy {
     });
   }
 
+  ngOnChanges(changes: SimpleChanges): void {
+    if (changes.blockWidth && this.blockWidth) {
+      this.blockPadding = 0.24 * this.blockWidth;
+      this.containerOffset = 0.32 * this.blockWidth;
+      this.blockOffset = this.blockWidth + this.blockPadding;
+    }
+  }
+
   ngOnDestroy() {
     this.markBlocksSubscription.unsubscribe();
     this.blockSubscription.unsubscribe();
@@ -222,23 +241,35 @@ export class MempoolBlocksComponent implements OnInit, OnDestroy {
     clearTimeout(this.resetTransitionTimeout);
   }
 
+  @HostListener('window:resize', ['$event'])
+  onResize(): void {
+    this.animateEntry = false;
+  }
+
   trackByFn(index: number, block: MempoolBlock) {
-    return (block.isStack) ? 'stack' : block.index;
+    return (block.isStack) ? `stack-${block.index}` : block.index;
   }
 
   reduceMempoolBlocksToFitScreen(blocks: MempoolBlock[]): MempoolBlock[] {
     const innerWidth = this.stateService.env.BASE_MODULE !== 'liquid' && window.innerWidth <= 767.98 ? window.innerWidth : window.innerWidth / 2;
-    const blocksAmount = Math.min(this.stateService.env.MEMPOOL_BLOCKS_AMOUNT, Math.floor(innerWidth / (this.blockWidth + this.blockPadding)));
+    let blocksAmount;
+    if (this.count) {
+      blocksAmount = 8;
+    } else {
+      blocksAmount = Math.min(this.stateService.env.MEMPOOL_BLOCKS_AMOUNT, Math.floor(innerWidth / (this.blockWidth + this.blockPadding)));
+    }
     while (blocks.length > blocksAmount) {
       const block = blocks.pop();
-      const lastBlock = blocks[blocks.length - 1];
+      if (!this.count) {
-      lastBlock.blockSize += block.blockSize;
+        const lastBlock = blocks[blocks.length - 1];
-      lastBlock.blockVSize += block.blockVSize;
+        lastBlock.blockSize += block.blockSize;
-      lastBlock.nTx += block.nTx;
+        lastBlock.blockVSize += block.blockVSize;
-      lastBlock.feeRange = lastBlock.feeRange.concat(block.feeRange);
+        lastBlock.nTx += block.nTx;
-      lastBlock.feeRange.sort((a, b) => a - b);
+        lastBlock.feeRange = lastBlock.feeRange.concat(block.feeRange);
-      lastBlock.medianFee = this.median(lastBlock.feeRange);
+        lastBlock.feeRange.sort((a, b) => a - b);
-      lastBlock.totalFees += block.totalFees;
+        lastBlock.medianFee = this.median(lastBlock.feeRange);
+        lastBlock.totalFees += block.totalFees;
+      }
     }
     if (blocks.length) {
       blocks[blocks.length - 1].isStack = blocks[blocks.length - 1].blockVSize > this.stateService.blockVSize;
@@ -284,20 +315,20 @@ export class MempoolBlocksComponent implements OnInit, OnDestroy {
     });
 
     return {
-      'right': 40 + index * 155 + 'px',
+      'right': this.containerOffset + index * this.blockOffset + 'px',
       'background': backgroundGradients.join(',') + ')'
     };
   }
 
   getStyleForMempoolEmptyBlock(index: number) {
     return {
-      'right': 40 + index * 155 + 'px',
+      'right': this.containerOffset + index * this.blockOffset + 'px',
       'background': '#554b45',
     };
   }
 
   calculateTransactionPosition() {
-    if ((!this.txFeePerVSize && (this.markIndex === undefined || this.markIndex === -1)) || !this.mempoolBlocks) {
+    if ((!this.txPosition && !this.txFeePerVSize && (this.markIndex === undefined || this.markIndex === -1)) || !this.mempoolBlocks) {
       this.arrowVisible = false;
       return;
     } else if (this.markIndex > -1) {
@@ -315,33 +346,43 @@ export class MempoolBlocksComponent implements OnInit, OnDestroy {
 
     this.arrowVisible = true;
 
-    let found = false;
+    if (this.txPosition) {
-    for (let txInBlockIndex = 0; txInBlockIndex < this.mempoolBlocks.length && !found; txInBlockIndex++) {
+      if (this.txPosition.block >= this.mempoolBlocks.length) {
-      const block = this.mempoolBlocks[txInBlockIndex];
+        this.rightPosition = ((this.mempoolBlocks.length - 1) * (this.blockWidth + this.blockPadding)) + this.blockWidth;
-      for (let i = 0; i < block.feeRange.length - 1 && !found; i++) {
+      } else {
-        if (this.txFeePerVSize < block.feeRange[i + 1] && this.txFeePerVSize >= block.feeRange[i]) {
+        const positionInBlock = Math.min(1, this.txPosition.vsize / this.stateService.blockVSize) * this.blockWidth;
-          const feeRangeIndex = i;
+        const positionOfBlock = this.txPosition.block * (this.blockWidth + this.blockPadding);
-          const feeRangeChunkSize = 1 / (block.feeRange.length - 1);
+        this.rightPosition = positionOfBlock + positionInBlock;
+      }
+    } else {
+      let found = false;
+      for (let txInBlockIndex = 0; txInBlockIndex < this.mempoolBlocks.length && !found; txInBlockIndex++) {
+        const block = this.mempoolBlocks[txInBlockIndex];
+        for (let i = 0; i < block.feeRange.length - 1 && !found; i++) {
+          if (this.txFeePerVSize < block.feeRange[i + 1] && this.txFeePerVSize >= block.feeRange[i]) {
+            const feeRangeIndex = i;
+            const feeRangeChunkSize = 1 / (block.feeRange.length - 1);
 
-          const txFee = this.txFeePerVSize - block.feeRange[i];
+            const txFee = this.txFeePerVSize - block.feeRange[i];
-          const max = block.feeRange[i + 1] - block.feeRange[i];
+            const max = block.feeRange[i + 1] - block.feeRange[i];
-          const blockLocation = txFee / max;
+            const blockLocation = txFee / max;
 
-          const chunkPositionOffset = blockLocation * feeRangeChunkSize;
+            const chunkPositionOffset = blockLocation * feeRangeChunkSize;
-          const feePosition = feeRangeChunkSize * feeRangeIndex + chunkPositionOffset;
+            const feePosition = feeRangeChunkSize * feeRangeIndex + chunkPositionOffset;
 
-          const blockedFilledPercentage = (block.blockVSize > this.stateService.blockVSize ? this.stateService.blockVSize : block.blockVSize) / this.stateService.blockVSize;
+            const blockedFilledPercentage = (block.blockVSize > this.stateService.blockVSize ? this.stateService.blockVSize : block.blockVSize) / this.stateService.blockVSize;
-          const arrowRightPosition = txInBlockIndex * (this.blockWidth + this.blockPadding)
+            const arrowRightPosition = txInBlockIndex * (this.blockWidth + this.blockPadding)
-            + ((1 - feePosition) * blockedFilledPercentage * this.blockWidth);
+              + ((1 - feePosition) * blockedFilledPercentage * this.blockWidth);
 
-          this.rightPosition = arrowRightPosition;
+            this.rightPosition = arrowRightPosition;
+            found = true;
+          }
+        }
+        if (this.txFeePerVSize >= block.feeRange[block.feeRange.length - 1]) {
+          this.rightPosition = txInBlockIndex * (this.blockWidth + this.blockPadding);
           found = true;
         }
       }
-      if (this.txFeePerVSize >= block.feeRange[block.feeRange.length - 1]) {
-        this.rightPosition = txInBlockIndex * (this.blockWidth + this.blockPadding);
-        found = true;
-      }
     }
   }
 

frontend/src/app/components/mempool-graph/mempool-graph.component.ts

@@ -23,8 +23,7 @@ import { download, formatterXAxis, formatterXAxisLabel } from '../../shared/grap
 })
 export class MempoolGraphComponent implements OnInit, OnChanges {
   @Input() data: any[];
-  @Input() limitFee = 350;
+  @Input() filterSize = 100000;
-  @Input() limitFilterFee = 1;
   @Input() height: number | string = 200;
   @Input() top: number | string = 20;
   @Input() right: number | string = 10;
@@ -99,16 +98,20 @@ export class MempoolGraphComponent implements OnInit, OnChanges {
   }
 
   generateArray(mempoolStats: OptimizedMempoolStats[]) {
-    const finalArray: number[][][] = [];
+    let finalArray: number[][][] = [];
     let feesArray: number[][] = [];
-    const limitFeesTemplate = this.template === 'advanced' ? 26 : 20;
+    let maxTier = 0;
-    for (let index = limitFeesTemplate; index > -1; index--) {
+    for (let index = 37; index > -1; index--) {
       feesArray = [];
       mempoolStats.forEach((stats) => {
+        if (stats.vsizes[index] >= this.filterSize) {
+          maxTier = Math.max(maxTier, index);
+        }
         feesArray.push([stats.added * 1000, stats.vsizes[index] ? stats.vsizes[index] : 0]);
       });
       finalArray.push(feesArray);
     }
+    this.feeLimitIndex = maxTier;
     finalArray.reverse();
     return finalArray;
   }
@@ -121,7 +124,7 @@ export class MempoolGraphComponent implements OnInit, OnChanges {
     const newColors = [];
     for (let index = 0; index < series.length; index++) {
       const value = series[index];
-      if (index >= this.feeLimitIndex) {
+      if (index < this.feeLimitIndex) {
         newColors.push(this.chartColorsOrdered[index]);
         seriesGraph.push({
           zlevel: 0,
@@ -371,17 +374,21 @@ export class MempoolGraphComponent implements OnInit, OnChanges {
 
   orderLevels() {
     this.feeLevelsOrdered = [];
-    for (let i = 0; i < feeLevels.length; i++) {
+    let maxIndex = Math.min(feeLevels.length, this.feeLimitIndex);
-      if (feeLevels[i] === this.limitFilterFee) {
+    for (let i = 0; i < maxIndex; i++) {
-        this.feeLimitIndex = i;
-      }
-      if (feeLevels[i] <= this.limitFee) {
         if (this.stateService.network === 'liquid' || this.stateService.network === 'liquidtestnet') {
-          this.feeLevelsOrdered.push(`${(feeLevels[i] / 10).toFixed(1)} - ${(feeLevels[i + 1]  / 10).toFixed(1)}`);
+          if (i === maxIndex - 1) {
+            this.feeLevelsOrdered.push(`${(feeLevels[i] / 10).toFixed(1)}+`);
+          } else {
+            this.feeLevelsOrdered.push(`${(feeLevels[i] / 10).toFixed(1)} - ${(feeLevels[i + 1]  / 10).toFixed(1)}`);
+          }
         } else {
-          this.feeLevelsOrdered.push(`${feeLevels[i]} - ${feeLevels[i + 1]}`);
+          if (i === maxIndex - 1) {
+            this.feeLevelsOrdered.push(`${feeLevels[i]}+`);
+          } else {
+            this.feeLevelsOrdered.push(`${feeLevels[i]} - ${feeLevels[i + 1]}`);
+          }
         }
-      }
     }
     this.chartColorsOrdered =  chartColors.slice(0, this.feeLevelsOrdered.length);
   }

frontend/src/app/components/mining-dashboard/mining-dashboard.component.html

@@ -73,24 +73,4 @@
     </div>
 
   </div>
-
-  <div class="pref-selectors">
-    <div class="selector">
-      <app-language-selector></app-language-selector>
-    </div>
-    <div class="selector">
-      <app-fiat-selector></app-fiat-selector>
-    </div>
-  </div>
-
-  <div class="terms-of-service">
-    <a [routerLink]="['/terms-of-service']" i18n="shared.terms-of-service|Terms of Service">Terms of Service</a>
-    |
-    <a [routerLink]="['/privacy-policy']" i18n="shared.privacy-policy|Privacy Policy">Privacy Policy</a>
-    |
-    <a [routerLink]="['/tx/push' | relativeUrl]" i18n="shared.broadcast-transaction|Broadcast Transaction">Broadcast Transaction</a>
-  </div>
-
-  <br>
-
 </div>

frontend/src/app/components/mining-dashboard/mining-dashboard.component.scss

@@ -1,10 +1,6 @@
 .dashboard-container {
-  padding-bottom: 60px;
   text-align: center;
   margin-top: 0.5rem;
-  @media (min-width: 992px) {
-    padding-bottom: 0px;
-  }
   .col {
     margin-bottom: 1.5rem;
   }
@@ -104,22 +100,3 @@
   text-decoration: none;
   color: inherit;
 }
-
-.terms-of-service {
-  margin-top: 1rem;
-}
-
-.pref-selectors {
-  display: flex;
-  flex-direction: row;
-  flex-wrap: wrap;
-  justify-content: center;
-
-  .selector {
-    margin-left: .5em;
-    margin-bottom: .5em;
-    &:first {
-      margin-left: 0;
-    }
-  }
-}

frontend/src/app/components/pool-ranking/pool-ranking.component.html

@@ -75,7 +75,7 @@
     </form>
   </div>
 
-  <div [class]="!widget ? 'bottom-padding' : 'pb-0'" class="container pb-lg-0">
+  <div [class]="!widget ? '' : 'pb-0'" class="container pb-lg-0">
     <div [class]="widget ? 'chart-widget' : 'chart'" echarts [initOpts]="chartInitOptions" [options]="chartOptions"
       (chartInit)="onChartInit($event)">
     </div>
@@ -136,7 +136,6 @@
       </tbody>
     </table>
   </div>
-
 </div>
 
 

frontend/src/app/components/pool-ranking/pool-ranking.component.scss

@@ -10,6 +10,7 @@
   padding: 0px 15px;
   width: 100%;
   height: calc(100% - 140px);
+  padding-bottom: 20px;
   @media (max-width: 992px) {
     height: calc(100% - 190px);
   };
@@ -33,15 +34,6 @@
   }
 }
 
-.bottom-padding {
-  @media (max-width: 992px) {
-    padding-bottom: 65px
-  };
-  @media (max-width: 576px) {
-    padding-bottom: 65px
-  };
-}
-
 @media (max-width: 767.98px) {
   .pools-table th,
   .pools-table td {

frontend/src/app/components/rbf-list/rbf-list.component.html

@@ -0,0 +1,46 @@
+<div class="container-xl" style="min-height: 335px">
+  <h1 class="float-left" i18n="page.rbf-replacements">RBF Replacements</h1>
+  <div *ngIf="isLoading" class="spinner-border ml-3" role="status"></div>
+
+  <div class="mode-toggle float-right" *ngIf="fullRbfEnabled">
+    <form class="formRadioGroup">
+      <div class="btn-group btn-group-toggle" name="radioBasic">
+        <label class="btn btn-primary btn-sm" [class.active]="!fullRbf">
+          <input type="radio" [value]="'All'" fragment="" [routerLink]="[]"> All
+        </label>
+        <label class="btn btn-primary btn-sm" [class.active]="fullRbf">
+          <input type="radio" [value]="'Full RBF'" fragment="fullrbf" [routerLink]="[]"> Full RBF
+        </label>
+      </div>
+    </form>
+  </div>
+
+  <div class="clearfix"></div>
+
+  <div class="rbf-trees" style="min-height: 295px">
+    <ng-container *ngIf="rbfTrees$ | async as trees">
+      <div *ngFor="let tree of trees" class="tree">
+        <p class="info">
+          <span class="type">
+            <span *ngIf="isMined(tree)" class="badge badge-success" i18n="transaction.rbf.mined">Mined</span>
+            <span *ngIf="isFullRbf(tree)" class="badge badge-info" i18n="transaction.full-rbf">Full RBF</span>
+          </span>
+          <app-time kind="since" [time]="tree.time"></app-time>
+        </p>
+        <div class="timeline-wrapper" [class.mined]="isMined(tree)">
+          <app-rbf-timeline [replacements]="tree"></app-rbf-timeline>
+        </div>
+      </div>
+
+      <div class="no-replacements" *ngIf="!trees?.length">
+        <p i18n="rbf.no-replacements-yet">there are no replacements in the mempool yet!</p>
+      </div>
+    </ng-container>
+    
+    <!-- <ngb-pagination class="pagination-container float-right mt-2" [class]="isLoading ? 'disabled' : ''"
+      [collectionSize]="blocksCount" [rotate]="true" [maxSize]="maxSize" [pageSize]="15" [(page)]="page"
+      (pageChange)="pageChange(page)" [boundaryLinks]="true" [ellipses]="false">
+    </ngb-pagination> -->
+  </div>
+  
+</div>

frontend/src/app/components/rbf-list/rbf-list.component.scss

@@ -0,0 +1,35 @@
+.spinner-border {
+  height: 25px;
+  width: 25px;
+  margin-top: 13px;
+}
+
+.rbf-trees {
+  .info {
+    display: flex;
+    flex-direction: row;
+    justify-content: space-between;
+    align-items: baseline;
+    margin: 0;
+    margin-bottom: 0.5em;
+
+    .type {
+      .badge {
+        margin-left: .5em;
+      }
+    }
+  }
+
+  .tree {
+    margin-bottom: 1em;
+  }
+
+  .timeline-wrapper.mined {
+    border: solid 4px #1a9436;
+  }
+
+  .no-replacements {
+    margin: 1em;
+    text-align: center;
+  }
+}

frontend/src/app/components/rbf-list/rbf-list.component.ts

@@ -0,0 +1,81 @@
+import { Component, OnInit, ChangeDetectionStrategy, OnDestroy } from '@angular/core';
+import { ActivatedRoute, Router } from '@angular/router';
+import { BehaviorSubject, EMPTY, merge, Observable, Subscription } from 'rxjs';
+import { catchError, switchMap, tap } from 'rxjs/operators';
+import { WebsocketService } from '../../services/websocket.service';
+import { RbfTree } from '../../interfaces/node-api.interface';
+import { ApiService } from '../../services/api.service';
+import { StateService } from '../../services/state.service';
+
+@Component({
+  selector: 'app-rbf-list',
+  templateUrl: './rbf-list.component.html',
+  styleUrls: ['./rbf-list.component.scss'],
+  changeDetection: ChangeDetectionStrategy.OnPush,
+})
+export class RbfList implements OnInit, OnDestroy {
+  rbfTrees$: Observable<RbfTree[]>;
+  nextRbfSubject = new BehaviorSubject(null);
+  urlFragmentSubscription: Subscription;
+  fullRbfEnabled: boolean;
+  fullRbf: boolean;
+  isLoading = true;
+
+  constructor(
+    private route: ActivatedRoute,
+    private router: Router,
+    private apiService: ApiService,
+    public stateService: StateService,
+    private websocketService: WebsocketService,
+  ) {
+    this.fullRbfEnabled = stateService.env.FULL_RBF_ENABLED;
+  }
+
+  ngOnInit(): void {
+    this.urlFragmentSubscription = this.route.fragment.subscribe((fragment) => {
+      this.fullRbf = (fragment === 'fullrbf');
+      this.websocketService.startTrackRbf(this.fullRbf ? 'fullRbf' : 'all');
+      this.nextRbfSubject.next(null);
+    });
+
+    this.rbfTrees$ = merge(
+      this.nextRbfSubject.pipe(
+        switchMap(() => {
+          return this.apiService.getRbfList$(this.fullRbf);
+        }),
+        catchError((e) => {
+          return EMPTY;
+        })
+      ),
+      this.stateService.rbfLatest$
+    )
+    .pipe(
+      tap(() => {
+        this.isLoading = false;
+      })
+    );
+  }
+
+  toggleFullRbf(event) {
+    this.router.navigate([], {
+      relativeTo: this.route,
+      fragment: this.fullRbf ? null : 'fullrbf'
+    });
+  }
+
+  isFullRbf(tree: RbfTree): boolean {
+    return tree.fullRbf;
+  }
+
+  isMined(tree: RbfTree): boolean {
+    return tree.mined;
+  }
+
+  // pageChange(page: number) {
+  //   this.fromTreeSubject.next(this.lastTreeId);
+  // }
+
+  ngOnDestroy(): void {
+    this.websocketService.stopTrackRbf();
+  }
+}

frontend/src/app/components/rbf-timeline/rbf-timeline-tooltip.component.html

@@ -0,0 +1,38 @@
+<div
+  #tooltip
+  *ngIf="rbfInfo && tooltipPosition !== null"
+  class="rbf-tooltip"
+  [style.left]="tooltipPosition.x + 'px'"
+  [style.top]="tooltipPosition.y + 'px'"
+>
+  <table>
+    <tbody>
+      <tr>
+        <td class="td-width" i18n="shared.transaction">Transaction</td>
+        <td>
+          <a [routerLink]="['/tx/' | relativeUrl, rbfInfo.tx.txid]">{{ rbfInfo.tx.txid | shortenString : 16}}</a>
+        </td>
+      </tr>
+      <tr>
+        <td class="td-width" i18n="transaction.first-seen|Transaction first seen">First seen</td>
+        <td><i><app-time kind="since" [time]="rbfInfo.time" [fastRender]="true"></app-time></i></td>
+      </tr>
+      <tr>
+        <td class="td-width" i18n="transaction.fee|Transaction fee">Fee</td>
+        <td>{{ rbfInfo.tx.fee | number }} <span class="symbol" i18n="shared.sat|sat">sat</span></td>
+      </tr>
+      <tr>
+        <td class="td-width" i18n="transaction.vsize|Transaction Virtual Size">Virtual size</td>
+        <td [innerHTML]="'&lrm;' + (rbfInfo.tx.vsize | vbytes: 2)"></td>
+      </tr>
+      <tr>
+        <td class="td-width" i18n="transaction.status|Transaction Status">Status</td>
+        <td>
+          <span *ngIf="rbfInfo.tx.rbf; else rbfDisabled" class="badge badge-success" i18n="rbfInfo-features.tag.rbf|RBF">RBF</span>
+          <ng-template #rbfDisabled><span class="badge badge-danger mr-1"><del i18n="rbfInfo-features.tag.rbf|RBF">RBF</del></span></ng-template>
+          <span *ngIf="rbfInfo.tx.mined" class="badge badge-success" i18n="transaction.rbf.mined">Mined</span>
+        </td>
+      </tr>
+    </tbody>
+  </table>
+</div>

frontend/src/app/components/rbf-timeline/rbf-timeline-tooltip.component.scss

@@ -0,0 +1,25 @@
+.rbf-tooltip {
+  position: fixed;
+  z-index: 3;
+  background: rgba(#11131f, 0.95);
+  border-radius: 4px;
+  box-shadow: 1px 1px 10px rgba(0,0,0,0.5);
+  color: #b1b1b1;
+  display: flex;
+  flex-direction: column;
+  justify-content: space-between;
+  padding: 10px 15px;
+  text-align: left;
+  pointer-events: none;
+
+  .badge {
+    margin-right: 1em;
+    &:last-child {
+      margin-right: 0;
+    }
+  }
+}
+
+.td-width {
+  padding-right: 10px;
+}

frontend/src/app/components/rbf-timeline/rbf-timeline-tooltip.component.ts

@@ -0,0 +1,35 @@
+import { Component, ElementRef, ViewChild, Input, OnChanges } from '@angular/core';
+import { RbfInfo } from '../../interfaces/node-api.interface';
+
+@Component({
+  selector: 'app-rbf-timeline-tooltip',
+  templateUrl: './rbf-timeline-tooltip.component.html',
+  styleUrls: ['./rbf-timeline-tooltip.component.scss'],
+})
+export class RbfTimelineTooltipComponent implements OnChanges {
+  @Input() rbfInfo: RbfInfo | void;
+  @Input() cursorPosition: { x: number, y: number };
+
+  tooltipPosition = null;
+
+  @ViewChild('tooltip') tooltipElement: ElementRef<HTMLCanvasElement>;
+
+  constructor() {}
+
+  ngOnChanges(changes): void {
+    if (changes.cursorPosition && changes.cursorPosition.currentValue) {
+      let x = Math.max(10, changes.cursorPosition.currentValue.x - 50);
+      let y = changes.cursorPosition.currentValue.y + 20;
+      if (this.tooltipElement) {
+        const elementBounds = this.tooltipElement.nativeElement.getBoundingClientRect();
+        if ((x + elementBounds.width) > (window.innerWidth - 10)) {
+          x = Math.max(0, window.innerWidth - elementBounds.width - 10);
+        }
+        if (y + elementBounds.height > (window.innerHeight - 20)) {
+          y = y - elementBounds.height - 20;
+        }
+      }
+      this.tooltipPosition = { x, y };
+    }
+  }
+}

frontend/src/app/components/rbf-timeline/rbf-timeline.component.html

@@ -0,0 +1,73 @@
+<div class="rbf-timeline box" [class.mined]="replacements.mined">
+  <div class="timeline-wrapper">
+    <div class="timeline" *ngFor="let timeline of rows">
+      <div class="intervals">
+        <ng-container *ngFor="let cell of timeline; let i = index;">
+          <div class="node-spacer"></div>
+          <ng-container *ngIf="i < timeline.length - 1">
+            <div class="interval" *ngIf="cell.replacement?.interval != null; else intervalSpacer">
+              <div class="interval-time">
+                <app-time [time]="cell.replacement.interval" [relative]="false"></app-time>
+              </div>
+            </div>
+          </ng-container>
+        </ng-container>
+      </div>
+      <div class="nodes">
+        <ng-container *ngFor="let cell of timeline; let i = index;">
+          <ng-container *ngIf="cell.replacement; else nonNode">
+            <div class="node"
+              [id]="'node-'+cell.replacement.tx.txid"
+              [class.selected]="txid === cell.replacement.tx.txid"
+              [class.mined]="cell.replacement.tx.mined"
+              [class.first-node]="cell.first"
+            >
+              <div class="track"></div>
+              <a class="shape-border"
+                [class.rbf]="cell.replacement.tx.rbf"
+                [routerLink]="['/tx/' | relativeUrl, cell.replacement.tx.txid]"
+                (pointerover)="onHover($event, cell.replacement);"
+                (pointerout)="onBlur($event);"
+              >
+                <div class="shape"></div>
+              </a>
+              <span class="fee-rate">{{ cell.replacement.tx.fee / (cell.replacement.tx.vsize) | feeRounding }} <span class="symbol" i18n="shared.sat-vbyte|sat/vB">sat/vB</span></span>
+            </div>
+          </ng-container>
+          <ng-template #nonNode>
+            <ng-container [ngSwitch]="cell.connector">
+              <div class="connector" *ngSwitchCase="'pipe'"><div class="pipe"></div></div>
+              <div class="connector" *ngSwitchCase="'corner'"><div class="corner"></div></div>
+              <div class="node-spacer" *ngSwitchDefault></div>
+            </ng-container>
+          </ng-template>
+          <ng-container *ngIf="i < timeline.length - 1">
+            <div class="interval-spacer" *ngIf="cell.replacement?.interval != null; else intervalSpacer">
+              <div class="track"></div>
+            </div>
+          </ng-container>
+        </ng-container>
+      </div>
+    </div>
+  </div>
+
+  <ng-template #nodeSpacer>
+    <div class="node-spacer"></div>
+  </ng-template>
+
+  <ng-template #intervalSpacer>
+    <div class="interval-spacer"></div>
+  </ng-template>
+
+  <app-rbf-timeline-tooltip
+    [rbfInfo]="hoverInfo"
+    [cursorPosition]="tooltipPosition"
+  ></app-rbf-timeline-tooltip>
+
+  <!-- <app-rbf-timeline-tooltip
+    *ngIf=[tooltip]
+    [line]="hoverLine"
+    [cursorPosition]="tooltipPosition"
+    [isConnector]="hoverConnector"
+  ></app-rbf-timeline-tooltip> -->
+</div>

frontend/src/app/components/rbf-timeline/rbf-timeline.component.scss

@@ -0,0 +1,193 @@
+.rbf-timeline {
+  position: relative;
+  width: 100%;
+  padding: 1em 0;
+
+  &::after, &::before {
+    content: '';
+    display: block;
+    position: absolute;
+    top: 0;
+    bottom: 0;
+    width: 2em;
+    z-index: 2;
+  }
+
+  &::before {
+    left: 0;
+    background: linear-gradient(to right, #24273e, #24273e, transparent);
+  }
+
+  &::after {
+    right: 0;
+    background: linear-gradient(to left, #24273e, #24273e, transparent);
+  }
+
+  .timeline-wrapper {
+    position: relative;
+    width: calc(100% - 2em);
+    margin: auto;
+    overflow-x: auto;
+    -ms-overflow-style: none;
+    scrollbar-width: none;
+
+    &::-webkit-scrollbar {
+      display: none;
+    }
+  }
+
+  .intervals, .nodes {
+    min-width: 100%;
+    display: flex;
+    flex-direction: row;
+    justify-content: space-between;
+    align-items: flex-start;
+    text-align: center;
+
+    .node, .node-spacer, .connector {
+      width: 6em;
+      min-width: 6em;
+      flex-grow: 1;
+    }
+
+    .interval, .interval-spacer {
+      width: 8em;
+      min-width: 5em;
+      max-width: 8em;
+      height: 32px;
+      display: flex;
+      flex-direction: row;
+      justify-content: center;
+      align-items: flex-end;
+    }
+
+    .interval {
+      overflow: visible;
+    }
+
+    .interval-time {
+      font-size: 12px;
+      line-height: 16px;
+      white-space: nowrap;
+    }
+  }
+
+  .node, .interval-spacer {
+    position: relative;
+    .track {
+      position: absolute;
+      height: 10px;
+      left: -5px;
+      right: -5px;
+      top: 0;
+      transform: translateY(-50%);
+      background: #105fb0;
+      border-radius: 5px;
+    }
+    &.first-node {
+      .track {
+        left: 50%;
+      }
+    }
+    &:last-child {
+      .track {
+        right: 50%;
+      }
+    }
+  }
+
+  .nodes {
+    position: relative;
+    margin-top: 1em;
+    .node {
+      .shape-border {
+        display: block;
+        margin: auto;
+        height: calc(1em + 8px);
+        width: calc(1em + 8px);
+        margin-bottom: -8px;
+        transform: translateY(-50%);
+        border-radius: 10%;
+        cursor: pointer;
+        padding: 4px;
+        background: transparent;
+        transition: background-color 300ms, padding 300ms;
+
+        .shape {
+          width: 100%;
+          height: 100%;
+          border-radius: 10%;
+          background: white;
+          transition: background-color 300ms, border 300ms;
+        }
+
+        &.rbf, &.rbf .shape {
+          border-radius: 50%;
+        }
+      }
+
+      .symbol::ng-deep {
+        display: block;
+        margin-top: -0.5em;
+      }
+
+      &.selected {
+        .shape-border {
+          background: #9339f4;
+        }
+      }
+
+      &.mined {
+        .shape-border {
+          background: #1a9436;
+        }
+      }
+
+      .shape-border:hover {
+        padding: 0px;
+        .shape {
+          background: #1bd8f4;
+        }
+      }
+
+      &.selected.mined {
+        .shape-border {
+          background: #1a9436;
+          height: calc(1em + 16px);
+          width: calc(1em + 16px);
+
+          .shape {
+            border: solid 4px #9339f4;
+          }
+
+          &:hover {
+            padding: 4px;
+            .shape {
+              border-width: 1px;
+              border-color: #1bd8f4
+            }
+          }
+        }
+      }
+    }
+
+    .connector {
+      position: relative;
+      height: 10px;
+
+      .corner, .pipe {
+        position: absolute;
+        left: -10px;
+        width: 20px;
+        height: 108px;
+        bottom: 50%;
+        border-right: solid 10px #105fb0;
+      }
+
+      .corner {
+        border-bottom: solid 10px #105fb0;
+        border-bottom-right-radius: 10px;
+      }
+    }
+  }
+}

frontend/src/app/components/rbf-timeline/rbf-timeline.component.ts

@@ -0,0 +1,191 @@
+import { Component, Input, OnInit, OnChanges, Inject, LOCALE_ID, HostListener } from '@angular/core';
+import { Router } from '@angular/router';
+import { RbfInfo, RbfTree } from '../../interfaces/node-api.interface';
+import { StateService } from '../../services/state.service';
+import { ApiService } from '../../services/api.service';
+
+type Connector = 'pipe' | 'corner';
+
+interface TimelineCell {
+  replacement?: RbfInfo,
+  connector?: Connector,
+  first?: boolean,
+}
+
+@Component({
+  selector: 'app-rbf-timeline',
+  templateUrl: './rbf-timeline.component.html',
+  styleUrls: ['./rbf-timeline.component.scss'],
+})
+export class RbfTimelineComponent implements OnInit, OnChanges {
+  @Input() replacements: RbfTree;
+  @Input() txid: string;
+  rows: TimelineCell[][] = [];
+
+  hoverInfo: RbfInfo | void = null;
+  tooltipPosition = null;
+
+  dir: 'rtl' | 'ltr' = 'ltr';
+
+  constructor(
+    private router: Router,
+    private stateService: StateService,
+    private apiService: ApiService,
+    @Inject(LOCALE_ID) private locale: string,
+  ) {
+    if (this.locale.startsWith('ar') || this.locale.startsWith('fa') || this.locale.startsWith('he')) {
+      this.dir = 'rtl';
+    }
+  }
+
+  ngOnInit(): void {
+    this.rows = this.buildTimelines(this.replacements);
+  }
+
+  ngOnChanges(changes): void {
+    this.rows = this.buildTimelines(this.replacements);
+    if (changes.txid) {
+      setTimeout(() => { this.scrollToSelected(); });
+    }
+  }
+
+  // converts a tree of RBF events into a format that can be more easily rendered in HTML
+  buildTimelines(tree: RbfTree): TimelineCell[][] {
+    if (!tree) return [];
+
+    const split = this.splitTimelines(tree);
+    const timelines = this.prepareTimelines(split);
+    return this.connectTimelines(timelines);
+  }
+
+  // splits a tree into N leaf-to-root paths
+  splitTimelines(tree: RbfTree, tail: RbfInfo[] = []): RbfInfo[][] {
+    const replacements = [...tail, tree];
+    if (tree.replaces.length) {
+      return [].concat(...tree.replaces.map(subtree => this.splitTimelines(subtree, replacements)));
+    } else {
+      return [[...replacements]];
+    }
+  }
+
+  // merges separate leaf-to-root paths into a coherent forking timeline
+  // represented as a 2D array of Rbf events
+  prepareTimelines(lines: RbfInfo[][]): RbfInfo[][] {
+    lines.sort((a, b) => b.length - a.length);
+
+    const rows = lines.map(() => []);
+    let lineGroups = [lines];
+    let done = false;
+    let column = 0; // sanity check for while loop stopping condition
+    while (!done && column < 100) {
+      // iterate over timelines element-by-element
+      // at each step, group lines which share a common transaction at their head
+      // (i.e. lines terminating in the same replacement event)
+      let index = 0;
+      let emptyCount = 0;
+      const nextGroups = [];
+      for (const group of lineGroups) {
+        const toMerge: { [txid: string]: RbfInfo[][] } = {};
+        let emptyInGroup = 0;
+        let first = true;
+        for (const line of group) {
+          const head = line.shift() || null;
+          if (first) {
+            // only insert the first instance of the replacement node
+            rows[index].unshift(head);
+            first = false;
+          } else {
+            // substitute duplicates with empty cells
+            // (we'll fill these in with connecting lines later)
+            rows[index].unshift(null);
+          }
+          // group the tails of the remaining lines for the next iteration
+          if (line.length) {
+            const nextId = line[0].tx.txid;
+            if (!toMerge[nextId]) {
+              toMerge[nextId] = [];
+            }
+            toMerge[nextId].push(line);
+          } else {
+            emptyInGroup++;
+          }
+          index++;
+        }
+        for (const merged of Object.values(toMerge).sort((a, b) => b.length - a.length)) {
+          nextGroups.push(merged);
+        }
+        for (let i = 0; i < emptyInGroup; i++) {
+          nextGroups.push([[]]);
+        }
+        emptyCount += emptyInGroup;
+        lineGroups = nextGroups;
+        done = (emptyCount >= rows.length);
+      }
+      column++;
+    }
+    return rows;
+  }
+
+  // annotates a 2D timeline array with info needed to draw connecting lines for multi-replacements
+  connectTimelines(timelines: RbfInfo[][]): TimelineCell[][] {
+    const rows: TimelineCell[][] = [];
+    timelines.forEach((lines, row) => {
+      rows.push([]);
+      let started = false;
+      let finished = false;
+      lines.forEach((replacement, column) => {
+        const cell: TimelineCell = {};
+        if (replacement) {
+          cell.replacement = replacement;
+        }
+        rows[row].push(cell);
+        if (replacement) {
+          if (!started) {
+            cell.first = true;
+            started = true;
+          }
+        } else if (started && !finished) {
+          if (column < timelines[row].length) {
+            let matched = false;
+            for (let i = row; i >= 0 && !matched; i--) {
+              const nextCell = rows[i][column];
+              if (nextCell.replacement) {
+                matched = true;
+              } else if (i === row) {
+                rows[i][column] = {
+                  connector: 'corner'
+                };
+              } else if (nextCell.connector !== 'corner') {
+                rows[i][column] = {
+                  connector: 'pipe'
+                };
+              }
+            }
+          }
+          finished = true;
+        }
+      });
+    });
+    return rows;
+  }
+
+  scrollToSelected() {
+    const node = document.getElementById('node-' + this.txid);
+    if (node) {
+      node.scrollIntoView({ block: 'nearest', inline: 'center' });
+    }
+  }
+
+  @HostListener('pointermove', ['$event'])
+  onPointerMove(event) {
+    this.tooltipPosition = { x: event.clientX, y: event.clientY };
+  }
+
+  onHover(event, replacement): void {
+    this.hoverInfo = replacement;
+  }
+
+  onBlur(event): void {
+    this.hoverInfo = null;
+  }
+}

frontend/src/app/components/start/start.component.ts

@@ -137,9 +137,11 @@ export class StartComponent implements OnInit, OnDestroy {
   }
 
   onMouseDown(event: MouseEvent) {
-    this.mouseDragStartX = event.clientX;
+    if (!(event.which > 1 || event.button > 0)) {
-    this.resetMomentum(event.clientX);
+      this.mouseDragStartX = event.clientX;
-    this.blockchainScrollLeftInit = this.blockchainContainer.nativeElement.scrollLeft;
+      this.resetMomentum(event.clientX);
+      this.blockchainScrollLeftInit = this.blockchainContainer.nativeElement.scrollLeft;
+    }
   }
   onPointerDown(event: PointerEvent) {
     if (this.isiOS) {

frontend/src/app/components/statistics/statistics.component.html

@@ -84,8 +84,7 @@
         </div>
         <div class="card-body">
           <div class="incoming-transactions-graph">
-            <app-mempool-graph #mempoolgraph dir="ltr" [template]="'advanced'" [limitFee]="500"
+            <app-mempool-graph #mempoolgraph dir="ltr" [template]="'advanced'" [height]="500" [left]="65" [right]="10"
-              [limitFilterFee]="filterFeeIndex" [height]="500" [left]="65" [right]="10"
               [data]="mempoolStats && mempoolStats.length ? mempoolStats : null"></app-mempool-graph>
           </div>
         </div>

frontend/src/app/components/statistics/statistics.component.scss

@@ -1,5 +1,5 @@
 .container-graph {
-  padding: 0px 15px 60px;
+  padding: 0px 15px 10px;
 }
 
 .card-header {