Merge calculateMempoolTxCpfp and calculateLocalTxCpfp

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

@@ -54,6 +54,8 @@ class BitcoinRoutes {
       .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))
+      .post(config.MEMPOOL.API_URL_PREFIX + 'prevouts', this.$getPrevouts)
+      .post(config.MEMPOOL.API_URL_PREFIX + 'cpfp', this.getCpfpLocalTxs)
       // Temporarily add txs/package endpoint for all backends until esplora supports it
       .post(config.MEMPOOL.API_URL_PREFIX + 'txs/package', this.$submitPackage)
       ;
@@ -930,6 +932,92 @@ class BitcoinRoutes {
     }
   }
 
+  private async $getPrevouts(req: Request, res: Response) {
+    try {
+      const outpoints = req.body;
+      if (!Array.isArray(outpoints) || outpoints.some((item) => !/^[a-fA-F0-9]{64}$/.test(item.txid) || typeof item.vout !== 'number')) {
+        handleError(req, res, 400, 'Invalid outpoints format');
+        return;
+      }
+
+      if (outpoints.length > 100) {
+        handleError(req, res, 400, 'Too many outpoints requested');
+        return;
+      }
+
+      const result = Array(outpoints.length).fill(null);
+      const memPool = mempool.getMempool();
+
+      for (let i = 0; i < outpoints.length; i++) {
+        const outpoint = outpoints[i];
+        let prevout: IEsploraApi.Vout | null = null;
+        let unconfirmed: boolean | null = null;
+
+        const mempoolTx = memPool[outpoint.txid];
+        if (mempoolTx) {
+          if (outpoint.vout < mempoolTx.vout.length) {
+            prevout = mempoolTx.vout[outpoint.vout];
+            unconfirmed = true;
+          }
+        } else {
+          try {
+            const rawPrevout = await bitcoinClient.getTxOut(outpoint.txid, outpoint.vout, false);
+            if (rawPrevout) {
+              prevout = {
+                value: Math.round(rawPrevout.value * 100000000),
+                scriptpubkey: rawPrevout.scriptPubKey.hex,
+                scriptpubkey_asm: rawPrevout.scriptPubKey.asm ? transactionUtils.convertScriptSigAsm(rawPrevout.scriptPubKey.hex) : '',
+                scriptpubkey_type: transactionUtils.translateScriptPubKeyType(rawPrevout.scriptPubKey.type),
+                scriptpubkey_address: rawPrevout.scriptPubKey && rawPrevout.scriptPubKey.address ? rawPrevout.scriptPubKey.address : '',
+              };
+              unconfirmed = false;
+            }
+          } catch (e) {
+            // Ignore bitcoin client errors, just leave prevout as null
+          }
+        }
+
+        if (prevout) {
+          result[i] = { prevout, unconfirmed };
+        }
+      }
+
+      res.json(result);
+
+    } catch (e) {
+      handleError(req, res, 500, 'Failed to get prevouts');
+    }
+  }
+
+  private getCpfpLocalTxs(req: Request, res: Response) {
+    try {
+      const transactions = req.body;
+
+      if (!Array.isArray(transactions) || transactions.some(tx =>
+        !tx || typeof tx !== 'object' ||
+        !/^[a-fA-F0-9]{64}$/.test(tx.txid) ||
+        typeof tx.weight !== 'number' ||
+        typeof tx.sigops !== 'number' ||
+        typeof tx.fee !== 'number' ||
+        !Array.isArray(tx.vin) ||
+        !Array.isArray(tx.vout)
+      )) {
+        handleError(req, res, 400, 'Invalid transactions format');
+        return;
+      }
+
+      if (transactions.length > 1) {
+        handleError(req, res, 400, 'More than one transaction is not supported yet');
+        return;
+      }
+
+      const cpfpInfo = calculateMempoolTxCpfp(transactions[0], mempool.getMempool(), true);
+      res.json([cpfpInfo]);
+
+    } catch (e) {
+      handleError(req, res, 500, 'Failed to calculate CPFP info');
+    }
+  }
 }
 
 export default new BitcoinRoutes();

backend/src/api/cpfp.ts

@@ -167,8 +167,10 @@ export function calculateGoodBlockCpfp(height: number, transactions: MempoolTran
 /**
  * Takes a mempool transaction and a copy of the current mempool, and calculates the CPFP data for
  * that transaction (and all others in the same cluster)
+ * If the passed transaction is not guaranteed to be in the mempool, set localTx to true: this will
+ * prevent updating the CPFP data of other transactions in the cluster
  */
-export function calculateMempoolTxCpfp(tx: MempoolTransactionExtended, mempool: { [txid: string]: MempoolTransactionExtended }): CpfpInfo {
+export function calculateMempoolTxCpfp(tx: MempoolTransactionExtended, mempool: { [txid: string]: MempoolTransactionExtended }, localTx: boolean = false): CpfpInfo {
   if (tx.cpfpUpdated && Date.now() < (tx.cpfpUpdated + CPFP_UPDATE_INTERVAL)) {
     tx.cpfpDirty = false;
     return {
@@ -198,6 +200,13 @@ export function calculateMempoolTxCpfp(tx: MempoolTransactionExtended, mempool:
     totalFee += tx.fees.base;
   }
   const effectiveFeePerVsize = totalFee / totalVsize;
+
+  if (localTx) {
+    tx.effectiveFeePerVsize = effectiveFeePerVsize;
+    tx.ancestors = Array.from(cluster.get(tx.txid)?.ancestors.values() || []).map(ancestor => ({ txid: ancestor.txid, weight: ancestor.weight, fee: ancestor.fees.base }));
+    tx.descendants = Array.from(cluster.values()).filter(entry => entry.txid !== tx.txid && !cluster.get(tx.txid)?.ancestors.has(entry.txid)).map(tx => ({ txid: tx.txid, weight: tx.weight, fee: tx.fees.base }));
+    tx.bestDescendant = null;
+  } else {
     for (const tx of cluster.values()) {
       mempool[tx.txid].effectiveFeePerVsize = effectiveFeePerVsize;
       mempool[tx.txid].ancestors = Array.from(tx.ancestors.values()).map(tx => ({ txid: tx.txid, weight: tx.weight, fee: tx.fees.base }));
@@ -210,6 +219,8 @@ export function calculateMempoolTxCpfp(tx: MempoolTransactionExtended, mempool:
 
     tx = mempool[tx.txid];
 
+  }
+
   return {
     ancestors: tx.ancestors || [],
     bestDescendant: tx.bestDescendant || null,

backend/src/api/transaction-utils.ts

@@ -420,6 +420,29 @@ class TransactionUtils {
 
     return { prioritized, deprioritized };
   }
+
+  // Copied from https://github.com/mempool/mempool/blob/14e49126c3ca8416a8d7ad134a95c5e090324d69/backend/src/api/bitcoin/bitcoin-api.ts#L324
+  public translateScriptPubKeyType(outputType: string): string {
+    const map = {
+      'pubkey': 'p2pk',
+      'pubkeyhash': 'p2pkh',
+      'scripthash': 'p2sh',
+      'witness_v0_keyhash': 'v0_p2wpkh',
+      'witness_v0_scripthash': 'v0_p2wsh',
+      'witness_v1_taproot': 'v1_p2tr',
+      'nonstandard': 'nonstandard',
+      'multisig': 'multisig',
+      'anchor': 'anchor',
+      'nulldata': 'op_return'
+    };
+
+    if (map[outputType]) {
+      return map[outputType];
+    } else {
+      return 'unknown';
+    }
+  }
+  
 }
 
 export default new TransactionUtils();

frontend/src/app/components/transaction/cpfp-info.component.html

@@ -0,0 +1,56 @@
+<br>
+<div class="title">
+  <h2 class="text-left" i18n="transaction.related-transactions|CPFP List">Related Transactions</h2>
+</div>
+<div class="box cpfp-details">
+  <table class="table table-fixed table-borderless table-striped">
+    <thead>
+      <tr>
+        <th i18n="transactions-list.vout.scriptpubkey-type">Type</th>
+        <th class="txids" i18n="dashboard.latest-transactions.txid">TXID</th>
+        <th *only-vsize class="d-none d-lg-table-cell" i18n="transaction.vsize|Transaction Virtual Size">Virtual size</th>
+        <th *only-weight class="d-none d-lg-table-cell" i18n="transaction.weight|Transaction Weight">Weight</th>
+        <th i18n="transaction.fee-rate|Transaction fee rate">Fee rate</th>
+        <th class="d-none d-lg-table-cell"></th>
+      </tr>
+    </thead>
+    <tbody>
+      <ng-template [ngIf]="cpfpInfo?.descendants?.length">
+        <tr *ngFor="let cpfpTx of cpfpInfo.descendants">
+          <td><span class="badge badge-primary" i18n="transaction.descendant|Descendant">Descendant</span></td>
+          <td>
+            <app-truncate [text]="cpfpTx.txid" [link]="['/tx' | relativeUrl, cpfpTx.txid]"></app-truncate>
+          </td>
+          <td *only-vsize class="d-none d-lg-table-cell" [innerHTML]="cpfpTx.weight / 4 | vbytes: 2"></td>
+          <td *only-weight class="d-none d-lg-table-cell" [innerHTML]="cpfpTx.weight | wuBytes: 2"></td>
+          <td><app-fee-rate [fee]="cpfpTx.fee" [weight]="cpfpTx.weight"></app-fee-rate></td>
+          <td class="d-none d-lg-table-cell"><fa-icon  *ngIf="roundToOneDecimal(cpfpTx) > roundToOneDecimal(tx)"  class="arrow-green" [icon]="['fas', 'angle-double-up']" [fixedWidth]="true"></fa-icon></td>
+        </tr>
+      </ng-template>
+      <ng-template [ngIf]="cpfpInfo?.bestDescendant">
+        <tr>
+          <td><span class="badge badge-success" i18n="transaction.descendant|Descendant">Descendant</span></td>
+          <td class="txids">
+            <app-truncate [text]="cpfpInfo.bestDescendant.txid" [link]="['/tx' | relativeUrl, cpfpInfo.bestDescendant.txid]"></app-truncate>
+          </td>
+          <td *only-vsize class="d-none d-lg-table-cell" [innerHTML]="cpfpInfo.bestDescendant.weight / 4 | vbytes: 2"></td>
+          <td *only-weight class="d-none d-lg-table-cell" [innerHTML]="cpfpInfo.bestDescendant.weight | wuBytes: 2"></td>
+          <td><app-fee-rate [fee]="cpfpInfo.bestDescendant.fee" [weight]="cpfpInfo.bestDescendant.weight"></app-fee-rate></td>
+          <td class="d-none d-lg-table-cell"><fa-icon class="arrow-green" [icon]="['fas', 'angle-double-up']" [fixedWidth]="true"></fa-icon></td>
+        </tr>
+      </ng-template>
+      <ng-template [ngIf]="cpfpInfo?.ancestors?.length">
+        <tr *ngFor="let cpfpTx of cpfpInfo.ancestors">
+          <td><span class="badge badge-primary" i18n="transaction.ancestor|Transaction Ancestor">Ancestor</span></td>
+          <td class="txids">
+            <app-truncate [text]="cpfpTx.txid" [link]="['/tx' | relativeUrl, cpfpTx.txid]"></app-truncate>
+          </td>
+          <td *only-vsize class="d-none d-lg-table-cell" [innerHTML]="cpfpTx.weight / 4 | vbytes: 2"></td>
+          <td *only-weight class="d-none d-lg-table-cell" [innerHTML]="cpfpTx.weight | wuBytes: 2"></td>
+          <td><app-fee-rate [fee]="cpfpTx.fee" [weight]="cpfpTx.weight"></app-fee-rate></td>
+          <td class="d-none d-lg-table-cell"><fa-icon *ngIf="roundToOneDecimal(cpfpTx) < roundToOneDecimal(tx)" class="arrow-red" [icon]="['fas', 'angle-double-down']" [fixedWidth]="true"></fa-icon></td>
+        </tr>
+      </ng-template>
+    </tbody>
+  </table>
+</div>

frontend/src/app/components/transaction/cpfp-info.component.scss

@@ -0,0 +1,32 @@
+.title {
+  h2 {
+    line-height: 1;
+    margin: 0;
+    padding-bottom: 5px;
+  }
+}
+
+.cpfp-details {
+  .txids {
+    width: 60%;
+  }
+
+  @media (max-width: 500px) {
+    .txids {
+      width: 40%;
+    }
+  }
+}
+
+.arrow-green {
+	color: var(--success);
+}
+
+.arrow-red {
+	color: var(--red);
+}
+
+.badge {
+	position: relative;
+	top: -1px;
+}

frontend/src/app/components/transaction/cpfp-info.component.ts

@@ -0,0 +1,22 @@
+import { Component, OnInit, Input, ChangeDetectionStrategy } from '@angular/core';
+import { CpfpInfo } from '@interfaces/node-api.interface';
+import { Transaction } from '@interfaces/electrs.interface';
+
+@Component({
+  selector: 'app-cpfp-info',
+  templateUrl: './cpfp-info.component.html',
+  styleUrls: ['./cpfp-info.component.scss'],
+  changeDetection: ChangeDetectionStrategy.OnPush
+})
+export class CpfpInfoComponent implements OnInit {
+  @Input() cpfpInfo: CpfpInfo;
+  @Input() tx: Transaction;
+
+  constructor() {}
+
+  ngOnInit(): void {}
+
+  roundToOneDecimal(cpfpTx: any): number {
+    return +(cpfpTx.fee / (cpfpTx.weight / 4)).toFixed(1);
+  }
+}

frontend/src/app/components/transaction/transaction-raw.component.html

@@ -0,0 +1,205 @@
+<div class="container-xl">
+
+  @if (!transaction) {
+
+    <h1 style="margin-top: 19px;" i18n="shared.preview-transaction|Preview Transaction">Preview Transaction</h1>
+
+    <form [formGroup]="pushTxForm" (submit)="decodeTransaction()" novalidate>
+      <div class="mb-3">
+        <textarea formControlName="txRaw" class="form-control" rows="5" i18n-placeholder="transaction.hex" placeholder="Transaction hex"></textarea>
+      </div>
+      <button [disabled]="isLoading" type="submit" class="btn btn-primary mr-2" i18n="shared.preview-transaction|Preview Transaction">Preview Transaction</button>
+      <input type="checkbox" [checked]="!offlineMode" id="offline-mode" (change)="onOfflineModeChange($event)">
+      <label class="label" for="offline-mode">
+        <span i18n="transaction.fetch-prevout-data">Fetch prevout data</span>
+      </label>
+      <p *ngIf="error" class="red-color d-inline">Error decoding transaction, reason: {{ error }}</p>
+    </form>
+  }
+
+  @if (transaction && !error && !isLoading) {
+    <div class="title-block">
+      <h1 i18n="shared.preview-transaction|Preview Transaction">Preview Transaction</h1>
+
+      <span class="tx-link">
+        <span class="txid">
+          <app-truncate [text]="transaction.txid" [lastChars]="12" [link]="['/tx/' | relativeUrl, transaction.txid]" [disabled]="!successBroadcast">
+            <app-clipboard [text]="transaction.txid"></app-clipboard>
+          </app-truncate>
+        </span>
+      </span>
+
+      <div class="container-buttons">
+        <button *ngIf="!successBroadcast" [disabled]="isLoadingBroadcast" type="button" class="btn btn-sm btn-primary" i18n="transaction.broadcast|Broadcast" (click)="postTx()">Broadcast</button>
+        <button *ngIf="successBroadcast" type="button" class="btn btn-sm btn-success no-cursor" i18n="transaction.broadcasted|Broadcasted">Broadcasted</button>
+        <button class="btn btn-sm" style="margin-left: 10px; padding: 0;" (click)="resetForm()">&#10005;</button>
+      </div>
+
+    </div>
+
+    <p class="red-color d-inline">{{ errorBroadcast }}</p>
+
+    <div class="clearfix"></div>
+
+    @if (!hasPrevouts) {
+      <div class="alert alert-mempool">
+        @if (offlineMode) {
+          <span><strong>Prevouts are not loaded, some fields like fee rate cannot be displayed.</strong></span>
+        } @else {
+          <span><strong>Error loading prevouts</strong>. {{ errorPrevouts ? 'Reason: ' + errorPrevouts : '' }}</span>
+        }
+      </div>
+    }
+
+    @if (errorCpfpInfo) {
+      <div class="alert alert-mempool">
+        <span><strong>Error loading CPFP data</strong>. Reason: {{ errorCpfpInfo }}</span>
+      </div>
+    }
+
+    <app-transaction-details
+      [network]="stateService.network"
+      [tx]="transaction"
+      [isLoadingTx]="false"
+      [isMobile]="isMobile"
+      [isLoadingFirstSeen]="false"
+      [featuresEnabled]="true"
+      [filters]="filters"
+      [hasEffectiveFeeRate]="false"
+      [cpfpInfo]="null"
+      [ETA$]="ETA$"
+      [hasEffectiveFeeRate]="hasEffectiveFeeRate"
+      [cpfpInfo]="cpfpInfo"
+      [hasCpfp]="hasCpfp"
+      (toggleCpfp$)="this.showCpfpDetails = !this.showCpfpDetails"
+    ></app-transaction-details>
+  
+    <app-cpfp-info *ngIf="showCpfpDetails" [cpfpInfo]="cpfpInfo" [tx]="transaction"></app-cpfp-info>
+    <br>
+
+    <ng-container *ngIf="flowEnabled; else flowPlaceholder">
+      <div class="title float-left">
+        <h2 id="flow" i18n="transaction.flow|Transaction flow">Flow</h2>
+      </div>
+
+      <button type="button" class="btn btn-outline-info flow-toggle btn-sm float-right" (click)="toggleGraph()" i18n="hide-diagram">Hide diagram</button>
+
+      <div class="clearfix"></div>
+
+      <div class="box">
+        <div class="graph-container" #graphContainer>
+          <tx-bowtie-graph
+            [tx]="transaction"
+            [cached]="true"
+            [width]="graphWidth"
+            [height]="graphHeight"
+            [lineLimit]="inOutLimit"
+            [maxStrands]="graphExpanded ? maxInOut : 24"
+            [network]="stateService.network"
+            [tooltip]="true"
+            [connectors]="true"
+            [inputIndex]="null" [outputIndex]="null"
+          >
+          </tx-bowtie-graph>
+        </div>
+        <div class="toggle-wrapper" *ngIf="maxInOut > 24">
+          <button class="btn btn-sm btn-primary graph-toggle" (click)="expandGraph();" *ngIf="!graphExpanded; else collapseBtn"><span i18n="show-more">Show more</span></button>
+          <ng-template #collapseBtn>
+            <button class="btn btn-sm btn-primary graph-toggle" (click)="collapseGraph();"><span i18n="show-less">Show less</span></button>
+          </ng-template>
+        </div>
+      </div>
+
+      <br>
+    </ng-container>
+    <ng-template #flowPlaceholder>
+      <div class="box hidden">
+        <div class="graph-container" #graphContainer>
+        </div>
+      </div>
+    </ng-template>
+
+    <div class="subtitle-block">
+      <div class="title">
+        <h2 i18n="transaction.inputs-and-outputs|Transaction inputs and outputs">Inputs & Outputs</h2>
+      </div>
+
+      <div class="title-buttons">
+        <button *ngIf="!flowEnabled" type="button" class="btn btn-outline-info flow-toggle btn-sm" (click)="toggleGraph()" i18n="show-diagram">Show diagram</button>
+        <button type="button" class="btn btn-outline-info btn-sm" (click)="txList.toggleDetails()" i18n="transaction.details|Transaction Details">Details</button>
+      </div>
+    </div>
+
+
+    <app-transactions-list #txList [transactions]="[transaction]" [transactionPage]="true" [txPreview]="true"></app-transactions-list>
+
+    <div class="title text-left">
+      <h2 i18n="transaction.details|Transaction Details">Details</h2>
+    </div>
+    <div class="box">
+      <div class="row">
+        <div class="col-sm">
+          <table class="table table-borderless table-striped">
+            <tbody>
+              <tr>
+                <td i18n="block.size">Size</td>
+                <td [innerHTML]="'&lrm;' + (transaction.size | bytes: 2)"></td>
+              </tr>
+              <tr>
+                <td i18n="transaction.vsize|Transaction Virtual Size">Virtual size</td>
+                <td [innerHTML]="'&lrm;' + (transaction.weight / 4 | vbytes: 2)"></td>
+              </tr>
+              <tr *ngIf="adjustedVsize">
+                <td><ng-container i18n="transaction.adjusted-vsize|Transaction Adjusted VSize">Adjusted vsize</ng-container>
+                  <a class="info-link" [routerLink]="['/docs/faq/' | relativeUrl]" fragment="what-is-adjusted-vsize">
+                    <fa-icon [icon]="['fas', 'info-circle']" [fixedWidth]="true"></fa-icon>
+                  </a>
+                </td>
+                <td [innerHTML]="'&lrm;' + (adjustedVsize | vbytes: 2)"></td>
+              </tr>
+              <tr>
+                <td i18n="block.weight">Weight</td>
+                <td [innerHTML]="'&lrm;' + (transaction.weight | wuBytes: 2)"></td>
+              </tr>
+            </tbody>
+          </table>
+        </div>
+        <div class="col-sm">
+          <table class="table table-borderless table-striped">
+            <tbody>
+              <tr>
+                <td i18n="transaction.version">Version</td>
+                <td [innerHTML]="'&lrm;' + (transaction.version | number)"></td>
+              </tr>
+              <tr>
+                <td i18n="transaction.locktime">Locktime</td>
+                <td [innerHTML]="'&lrm;' + (transaction.locktime | number)"></td>
+              </tr>
+              <tr *ngIf="transaction.sigops >= 0">
+                <td><ng-container i18n="transaction.sigops|Transaction Sigops">Sigops</ng-container>
+                  <a class="info-link" [routerLink]="['/docs/faq/' | relativeUrl]" fragment="what-are-sigops">
+                    <fa-icon [icon]="['fas', 'info-circle']" [fixedWidth]="true"></fa-icon>
+                  </a>
+                </td>
+                <td [innerHTML]="'&lrm;' + (transaction.sigops | number)"></td>
+              </tr>
+              <tr>
+                <td i18n="transaction.hex">Transaction hex</td>
+                <td><app-clipboard [text]="pushTxForm.get('txRaw').value" [leftPadding]="false"></app-clipboard></td>
+              </tr>
+            </tbody>
+          </table>
+        </div>
+      </div>
+    </div>
+  }
+
+  @if (isLoading) {
+    <div class="text-center">
+      <div class="spinner-border text-light mt-2 mb-2"></div>
+      <h3 i18n="transaction.error.loading-prevouts">
+        Loading {{ isLoadingPrevouts ? 'transaction prevouts' : isLoadingCpfpInfo ? 'CPFP' : '' }}
+      </h3>
+    </div>
+  }
+</div>

frontend/src/app/components/transaction/transaction-raw.component.scss

@@ -0,0 +1,194 @@
+.label {
+  margin: 0 5px;
+}
+
+.container-buttons {
+  align-self: center;
+}
+
+.title-block {
+  flex-wrap: wrap;
+  align-items: baseline;
+  @media (min-width: 650px) {
+    flex-direction: row;
+  }
+  h1 {
+    margin: 0rem;
+    margin-right: 15px;
+    line-height: 1;
+  }
+}
+
+.tx-link {
+  display: flex;
+  flex-direction: row;
+  justify-content: flex-start;
+  align-items: baseline;
+  width: 0;
+  max-width: 100%;
+  margin-right: 0px;
+  margin-bottom: 0px;
+  margin-top: 8px;
+  @media (min-width: 651px) {
+    flex-grow: 1;
+    margin-bottom: 0px;
+    margin-right: 1em;
+    top: 1px;
+    position: relative;
+  }
+  @media (max-width: 650px) {
+    width: 100%;
+    order: 3;
+  }
+
+  .txid {
+    width: 200px;
+    min-width: 200px;
+    flex-grow: 1;
+  }
+}
+
+.container-xl {
+	margin-bottom: 40px;
+}
+
+.row {
+	flex-direction: column;
+	@media (min-width: 850px) {
+		flex-direction: row;
+	}
+}
+
+.box.hidden {
+  visibility: hidden;
+  height: 0px;
+  padding-top: 0px;
+  padding-bottom: 0px;
+  margin-top: 0px;
+  margin-bottom: 0px;
+}
+
+.graph-container {
+  position: relative;
+  width: 100%;
+  background: var(--stat-box-bg);
+  padding: 10px 0;
+  padding-bottom: 0;
+}
+
+.toggle-wrapper {
+  width: 100%;
+  text-align: center;
+  margin: 1.25em 0 0;
+}
+
+.graph-toggle {
+  margin: auto;
+}
+
+.table {
+  tr td {
+		padding: 0.75rem 0.5rem;
+		@media (min-width: 576px) {
+			padding: 0.75rem 0.75rem;
+		}
+		&:last-child {
+			text-align: right;
+			@media (min-width: 850px) {
+        text-align: left;
+			}
+		}
+		.btn {
+			display: block;
+		}
+
+    &.wrap-cell {
+      white-space: normal;
+    }
+	}
+}
+
+.effective-fee-container {
+	display: block;
+	@media (min-width: 768px){
+		display: inline-block;
+	}
+  @media (max-width: 425px){
+		display: flex;
+    flex-direction: column;
+	}
+}
+
+.effective-fee-rating {
+  @media (max-width: 767px){
+    margin-right: 0px !important;
+  }
+}
+
+.title {
+  h2 {
+    line-height: 1;
+    margin: 0;
+    padding-bottom: 5px;
+  }
+}
+
+.btn-outline-info {
+	margin-top: 5px;
+	@media (min-width: 768px){
+		margin-top: 0px;
+	}
+}
+
+.flow-toggle {
+  margin-top: -5px;
+  margin-left: 10px;
+	@media (min-width: 768px){
+		display: inline-block;
+    margin-top: 0px;
+    margin-bottom: 0px;
+	}
+}
+
+.subtitle-block {
+  display: flex;
+  flex-direction: row;
+  align-items: baseline;
+  justify-content: space-between;
+
+  .title {
+    flex-shrink: 0;
+  }
+
+  .title-buttons {
+    flex-shrink: 1;
+    text-align: right;
+    .btn {
+      margin-top: 0;
+      margin-bottom: 8px;
+      margin-left: 8px;
+    }
+  }
+}
+
+.cpfp-details {
+  .txids {
+    width: 60%;
+  }
+
+  @media (max-width: 500px) {
+    .txids {
+      width: 40%;
+    }
+  }
+}
+
+.disabled {
+  opacity: 0.5;
+  pointer-events: none;
+}
+
+.no-cursor {
+  cursor: default !important;
+  pointer-events: none;
+}

frontend/src/app/components/transaction/transaction-raw.component.ts

@@ -0,0 +1,328 @@
+import { Component, OnInit, HostListener, ViewChild, ElementRef, OnDestroy } from '@angular/core';
+import { Transaction, Vout } from '@interfaces/electrs.interface';
+import { StateService } from '../../services/state.service';
+import { Filter, toFilters } from '../../shared/filters.utils';
+import { decodeRawTransaction, getTransactionFlags, addInnerScriptsToVin, countSigops } from '../../shared/transaction.utils';
+import { ETA, EtaService } from '../../services/eta.service';
+import { combineLatest, firstValueFrom, map, Observable, startWith, Subscription } from 'rxjs';
+import { WebsocketService } from '../../services/websocket.service';
+import { ActivatedRoute, Router } from '@angular/router';
+import { UntypedFormBuilder, UntypedFormGroup, Validators } from '@angular/forms';
+import { ElectrsApiService } from '../../services/electrs-api.service';
+import { SeoService } from '../../services/seo.service';
+import { seoDescriptionNetwork } from '@app/shared/common.utils';
+import { ApiService } from '../../services/api.service';
+import { RelativeUrlPipe } from '@app/shared/pipes/relative-url/relative-url.pipe';
+import { CpfpInfo } from '../../interfaces/node-api.interface';
+
+@Component({
+  selector: 'app-transaction-raw',
+  templateUrl: './transaction-raw.component.html',
+  styleUrls: ['./transaction-raw.component.scss'],
+})
+export class TransactionRawComponent implements OnInit, OnDestroy {
+
+  pushTxForm: UntypedFormGroup;
+  isLoading: boolean;
+  isLoadingPrevouts: boolean;
+  isLoadingCpfpInfo: boolean;
+  offlineMode: boolean = false;
+  transaction: Transaction;
+  error: string;
+  errorPrevouts: string;
+  errorCpfpInfo: string;
+  hasPrevouts: boolean;
+  missingPrevouts: string[];
+  isLoadingBroadcast: boolean;
+  errorBroadcast: string;
+  successBroadcast: boolean;
+
+  isMobile: boolean;
+  @ViewChild('graphContainer')
+  graphContainer: ElementRef;
+  graphExpanded: boolean = false;
+  graphWidth: number = 1068;
+  graphHeight: number = 360;
+  inOutLimit: number = 150;
+  maxInOut: number = 0;
+  flowPrefSubscription: Subscription;
+  hideFlow: boolean = this.stateService.hideFlow.value;
+  flowEnabled: boolean;
+  adjustedVsize: number;
+  filters: Filter[] = [];
+  hasEffectiveFeeRate: boolean;
+  fetchCpfp: boolean;
+  cpfpInfo: CpfpInfo | null;
+  hasCpfp: boolean = false;
+  showCpfpDetails = false;
+  ETA$: Observable<ETA | null>;
+  mempoolBlocksSubscription: Subscription;
+
+  constructor(
+    public route: ActivatedRoute,
+    public router: Router,
+    public stateService: StateService,
+    public etaService: EtaService,
+    public electrsApi: ElectrsApiService,
+    public websocketService: WebsocketService,
+    public formBuilder: UntypedFormBuilder,
+    public seoService: SeoService,
+    public apiService: ApiService,
+    public relativeUrlPipe: RelativeUrlPipe,
+  ) {}
+
+  ngOnInit(): void {
+    this.seoService.setTitle($localize`:@@meta.title.preview-tx:Preview Transaction`);
+    this.seoService.setDescription($localize`:@@meta.description.preview-tx:Preview a transaction to the Bitcoin${seoDescriptionNetwork(this.stateService.network)} network using the transaction's raw hex data.`);
+    this.websocketService.want(['blocks', 'mempool-blocks']);
+    this.pushTxForm = this.formBuilder.group({
+      txRaw: ['', Validators.required],
+    });
+  }
+
+  async decodeTransaction(): Promise<void> {
+    this.resetState();
+    this.isLoading = true;
+    try {
+      const tx = decodeRawTransaction(this.pushTxForm.get('txRaw').value, this.stateService.network);
+      await this.fetchPrevouts(tx);
+      await this.fetchCpfpInfo(tx);
+      this.processTransaction(tx);
+    } catch (error) {
+      this.error = error.message;
+    } finally {
+      this.isLoading = false;
+    }
+  }
+
+  async fetchPrevouts(transaction: Transaction): Promise<void> {
+    if (this.offlineMode) {
+      return;
+    }
+
+    const prevoutsToFetch = transaction.vin.map((input) => ({ txid: input.txid, vout: input.vout }));
+
+    if (!prevoutsToFetch.length || transaction.vin[0].is_coinbase) {
+      this.hasPrevouts = true;
+      return;
+    }
+
+    try {
+      this.missingPrevouts = [];
+      this.isLoadingPrevouts = true;
+
+      const prevouts: { prevout: Vout, unconfirmed: boolean }[] = await firstValueFrom(this.apiService.getPrevouts$(prevoutsToFetch));
+
+      if (prevouts?.length !== prevoutsToFetch.length) {
+        throw new Error();
+      }
+
+      transaction.vin = transaction.vin.map((input, index) => {
+        if (prevouts[index]) {
+          input.prevout = prevouts[index].prevout;
+          addInnerScriptsToVin(input);
+        } else {
+          this.missingPrevouts.push(`${input.txid}:${input.vout}`);
+        }
+        return input;
+      });
+
+      if (this.missingPrevouts.length) {
+        throw new Error(`Some prevouts do not exist or are already spent (${this.missingPrevouts.length})`);
+      }
+
+      transaction.fee = transaction.vin.some(input => input.is_coinbase)
+        ? 0
+        : transaction.vin.reduce((fee, input) => {
+          return fee + (input.prevout?.value || 0);
+        }, 0) - transaction.vout.reduce((sum, output) => sum + output.value, 0);
+      transaction.feePerVsize = transaction.fee / (transaction.weight / 4);
+      transaction.sigops = countSigops(transaction);
+
+      this.hasPrevouts = true;
+      this.isLoadingPrevouts = false;
+      this.fetchCpfp = prevouts.some(prevout => prevout?.unconfirmed);
+    } catch (error) {
+      console.log(error);
+      this.errorPrevouts = error?.error?.error || error?.message;
+      this.isLoadingPrevouts = false;
+    }
+  }
+
+  async fetchCpfpInfo(transaction: Transaction): Promise<void> {
+    // Fetch potential cpfp data if all prevouts were parsed successfully and at least one of them is unconfirmed
+    if (this.hasPrevouts && this.fetchCpfp) {
+      try {
+        this.isLoadingCpfpInfo = true;
+        const cpfpInfo: CpfpInfo[] = await firstValueFrom(this.apiService.getCpfpLocalTx$([{
+          txid: transaction.txid,
+          weight: transaction.weight,
+          sigops: transaction.sigops,
+          fee: transaction.fee,
+          vin: transaction.vin,
+          vout: transaction.vout
+        }]));
+
+        if (cpfpInfo?.[0]?.ancestors?.length) {
+          const { ancestors, effectiveFeePerVsize } = cpfpInfo[0];
+          transaction.effectiveFeePerVsize = effectiveFeePerVsize;
+          this.cpfpInfo = { ancestors, effectiveFeePerVsize };
+          this.hasCpfp = true;
+          this.hasEffectiveFeeRate = true;
+        }
+        this.isLoadingCpfpInfo = false;
+      } catch (error) {
+        this.errorCpfpInfo = error?.error?.error || error?.message;
+        this.isLoadingCpfpInfo = false;
+      }
+    }
+  }
+
+  processTransaction(tx: Transaction): void {
+    this.transaction = tx;
+
+    this.transaction.flags = getTransactionFlags(this.transaction, null, null, null, this.stateService.network);
+    this.filters = this.transaction.flags ? toFilters(this.transaction.flags).filter(f => f.txPage) : [];
+    if (this.transaction.sigops >= 0) {
+      this.adjustedVsize = Math.max(this.transaction.weight / 4, this.transaction.sigops * 5);
+    }
+
+    this.setupGraph();
+    this.setFlowEnabled();
+    this.flowPrefSubscription = this.stateService.hideFlow.subscribe((hide) => {
+      this.hideFlow = !!hide;
+      this.setFlowEnabled();
+    });
+    this.setGraphSize();
+
+    this.ETA$ = combineLatest([
+      this.stateService.mempoolBlocks$.pipe(startWith(null)),
+      this.stateService.difficultyAdjustment$.pipe(startWith(null)),
+    ]).pipe(
+      map(([mempoolBlocks, da]) => {
+        return this.etaService.calculateETA(
+          this.stateService.network,
+          this.transaction,
+          mempoolBlocks,
+          null,
+          da,
+          null,
+          null,
+          null
+        );
+      })
+    );
+
+    this.mempoolBlocksSubscription = this.stateService.mempoolBlocks$.subscribe(() => {
+      if (this.transaction) {
+        this.stateService.markBlock$.next({
+          txid: this.transaction.txid,
+          txFeePerVSize: this.transaction.effectiveFeePerVsize || this.transaction.feePerVsize,
+        });
+      }
+    });
+  }
+
+  async postTx(): Promise<string> {
+    this.isLoadingBroadcast = true;
+    this.errorBroadcast = null;
+    return new Promise((resolve, reject) => {
+      this.apiService.postTransaction$(this.pushTxForm.get('txRaw').value)
+      .subscribe((result) => {
+        this.isLoadingBroadcast = false;
+        this.successBroadcast = true;
+        this.transaction.txid = result;
+        resolve(result);
+      },
+      (error) => {
+        if (typeof error.error === 'string') {
+          const matchText = error.error.replace(/\\/g, '').match('"message":"(.*?)"');
+          this.errorBroadcast = 'Failed to broadcast transaction, reason: ' + (matchText && matchText[1] || error.error);
+        } else if (error.message) {
+          this.errorBroadcast = 'Failed to broadcast transaction, reason: ' + error.message;
+        }
+        this.isLoadingBroadcast = false;
+        reject(this.error);
+      });
+    });
+  }
+
+  resetState() {
+    this.transaction = null;
+    this.error = null;
+    this.errorPrevouts = null;
+    this.errorBroadcast = null;
+    this.successBroadcast = false;
+    this.isLoading = false;
+    this.isLoadingPrevouts = false;
+    this.isLoadingCpfpInfo = false;
+    this.isLoadingBroadcast = false;
+    this.adjustedVsize = null;
+    this.showCpfpDetails = false;
+    this.hasCpfp = false;
+    this.fetchCpfp = false;
+    this.cpfpInfo = null;
+    this.hasEffectiveFeeRate = false;
+    this.filters = [];
+    this.hasPrevouts = false;
+    this.missingPrevouts = [];
+    this.stateService.markBlock$.next({});
+    this.mempoolBlocksSubscription?.unsubscribe();
+  }
+
+  resetForm() {
+    this.resetState();
+    this.pushTxForm.reset();
+  }
+
+  @HostListener('window:resize', ['$event'])
+  setGraphSize(): void {
+    this.isMobile = window.innerWidth < 850;
+    if (this.graphContainer?.nativeElement && this.stateService.isBrowser) {
+      setTimeout(() => {
+        if (this.graphContainer?.nativeElement?.clientWidth) {
+          this.graphWidth = this.graphContainer.nativeElement.clientWidth;
+        } else {
+          setTimeout(() => { this.setGraphSize(); }, 1);
+        }
+      }, 1);
+    } else {
+      setTimeout(() => { this.setGraphSize(); }, 1);
+    }
+  }
+
+  setupGraph() {
+    this.maxInOut = Math.min(this.inOutLimit, Math.max(this.transaction?.vin?.length || 1, this.transaction?.vout?.length + 1 || 1));
+    this.graphHeight = this.graphExpanded ? this.maxInOut * 15 : Math.min(360, this.maxInOut * 80);
+  }
+
+  toggleGraph() {
+    const showFlow = !this.flowEnabled;
+    this.stateService.hideFlow.next(!showFlow);
+  }
+
+  setFlowEnabled() {
+    this.flowEnabled = !this.hideFlow;
+  }
+
+  expandGraph() {
+    this.graphExpanded = true;
+    this.graphHeight = this.maxInOut * 15;
+  }
+
+  collapseGraph() {
+    this.graphExpanded = false;
+    this.graphHeight = Math.min(360, this.maxInOut * 80);
+  }
+
+  onOfflineModeChange(e): void {
+    this.offlineMode = !e.target.checked;
+  }
+
+  ngOnDestroy(): void {
+    this.mempoolBlocksSubscription?.unsubscribe();
+    this.flowPrefSubscription?.unsubscribe();
+    this.stateService.markBlock$.next({});
+  }
+
+}

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

@@ -66,64 +66,7 @@
   <ng-template [ngIf]="!isLoadingTx && !error">
 
     <!-- CPFP Details -->
-    <ng-template [ngIf]="showCpfpDetails">
-      <br>
-      <div class="title">
-        <h2 class="text-left" i18n="transaction.related-transactions|CPFP List">Related Transactions</h2>
-      </div>
-      <div class="box cpfp-details">
-        <table class="table table-fixed table-borderless table-striped">
-          <thead>
-            <tr>
-              <th i18n="transactions-list.vout.scriptpubkey-type">Type</th>
-              <th class="txids" i18n="dashboard.latest-transactions.txid">TXID</th>
-              <th *only-vsize class="d-none d-lg-table-cell" i18n="transaction.vsize|Transaction Virtual Size">Virtual size</th>
-              <th *only-weight class="d-none d-lg-table-cell" i18n="transaction.weight|Transaction Weight">Weight</th>
-              <th i18n="transaction.fee-rate|Transaction fee rate">Fee rate</th>
-              <th class="d-none d-lg-table-cell"></th>
-            </tr>
-          </thead>
-          <tbody>
-            <ng-template [ngIf]="cpfpInfo?.descendants?.length">
-              <tr *ngFor="let cpfpTx of cpfpInfo.descendants">
-                <td><span class="badge badge-primary" i18n="transaction.descendant|Descendant">Descendant</span></td>
-                <td>
-                  <app-truncate [text]="cpfpTx.txid" [link]="['/tx' | relativeUrl, cpfpTx.txid]"></app-truncate>
-                </td>
-                <td *only-vsize class="d-none d-lg-table-cell" [innerHTML]="cpfpTx.weight / 4 | vbytes: 2"></td>
-                <td *only-weight class="d-none d-lg-table-cell" [innerHTML]="cpfpTx.weight | wuBytes: 2"></td>
-                <td><app-fee-rate [fee]="cpfpTx.fee" [weight]="cpfpTx.weight"></app-fee-rate></td>
-                <td class="d-none d-lg-table-cell"><fa-icon  *ngIf="roundToOneDecimal(cpfpTx) > roundToOneDecimal(tx)"  class="arrow-green" [icon]="['fas', 'angle-double-up']" [fixedWidth]="true"></fa-icon></td>
-              </tr>
-            </ng-template>
-            <ng-template [ngIf]="cpfpInfo?.bestDescendant">
-              <tr>
-                <td><span class="badge badge-success" i18n="transaction.descendant|Descendant">Descendant</span></td>
-                <td class="txids">
-                  <app-truncate [text]="cpfpInfo.bestDescendant.txid" [link]="['/tx' | relativeUrl, cpfpInfo.bestDescendant.txid]"></app-truncate>
-                </td>
-                <td *only-vsize class="d-none d-lg-table-cell" [innerHTML]="cpfpInfo.bestDescendant.weight / 4 | vbytes: 2"></td>
-                <td *only-weight class="d-none d-lg-table-cell" [innerHTML]="cpfpInfo.bestDescendant.weight | wuBytes: 2"></td>
-                <td><app-fee-rate [fee]="cpfpInfo.bestDescendant.fee" [weight]="cpfpInfo.bestDescendant.weight"></app-fee-rate></td>
-                <td class="d-none d-lg-table-cell"><fa-icon class="arrow-green" [icon]="['fas', 'angle-double-up']" [fixedWidth]="true"></fa-icon></td>
-              </tr>
-            </ng-template>
-            <ng-template [ngIf]="cpfpInfo?.ancestors?.length">
-              <tr *ngFor="let cpfpTx of cpfpInfo.ancestors">
-                <td><span class="badge badge-primary" i18n="transaction.ancestor|Transaction Ancestor">Ancestor</span></td>
-                <td class="txids">
-                  <app-truncate [text]="cpfpTx.txid" [link]="['/tx' | relativeUrl, cpfpTx.txid]"></app-truncate>
-                </td>
-                <td *only-vsize class="d-none d-lg-table-cell" [innerHTML]="cpfpTx.weight / 4 | vbytes: 2"></td>
-                <td *only-weight class="d-none d-lg-table-cell" [innerHTML]="cpfpTx.weight | wuBytes: 2"></td>
-                <td><app-fee-rate [fee]="cpfpTx.fee" [weight]="cpfpTx.weight"></app-fee-rate></td>
-                <td class="d-none d-lg-table-cell"><fa-icon *ngIf="roundToOneDecimal(cpfpTx) < roundToOneDecimal(tx)" class="arrow-red" [icon]="['fas', 'angle-double-down']" [fixedWidth]="true"></fa-icon></td>
-              </tr>
-            </ng-template>
-          </tbody>
-        </table>
-      </div>
-    </ng-template>
+    <app-cpfp-info *ngIf="showCpfpDetails" [cpfpInfo]="cpfpInfo" [tx]="tx"></app-cpfp-info>
 
     <!-- Accelerator -->
     <ng-container *ngIf="!tx?.status?.confirmed && showAccelerationSummary && (ETA$ | async) as eta;">

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

@@ -227,18 +227,6 @@
   }
 }
 
-.cpfp-details {
-  .txids {
-    width: 60%;
-  }
-
-  @media (max-width: 500px) {
-    .txids {
-      width: 40%;
-    }
-  }
-}
-
 .tx-list {
   .alert-link {
     display: block;

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

@@ -1054,10 +1054,6 @@ export class TransactionComponent implements OnInit, AfterViewInit, OnDestroy {
     this.stateService.markBlock$.next({});
   }
 
-  roundToOneDecimal(cpfpTx: any): number {
-    return +(cpfpTx.fee / (cpfpTx.weight / 4)).toFixed(1);
-  }
-
   setupGraph() {
     this.maxInOut = Math.min(this.inOutLimit, Math.max(this.tx?.vin?.length || 1, this.tx?.vout?.length + 1 || 1));
     this.graphHeight = this.graphExpanded ? this.maxInOut * 15 : Math.min(360, this.maxInOut * 80);

frontend/src/app/components/transaction/transaction.module.ts

@@ -9,6 +9,8 @@ import { TransactionExtrasModule } from '@components/transaction/transaction-ext
 import { GraphsModule } from '@app/graphs/graphs.module';
 import { AccelerateCheckout } from '@components/accelerate-checkout/accelerate-checkout.component';
 import { AccelerateFeeGraphComponent } from '@components/accelerate-checkout/accelerate-fee-graph.component';
+import { TransactionRawComponent } from '@components/transaction/transaction-raw.component';
+import { CpfpInfoComponent } from '@components/transaction/cpfp-info.component';
 
 const routes: Routes = [
   {
@@ -16,6 +18,10 @@ const routes: Routes = [
     redirectTo: '/',
     pathMatch: 'full',
   },
+  {
+    path: 'preview',
+    component: TransactionRawComponent,
+  },
   {
     path: ':id',
     component: TransactionComponent,
@@ -49,12 +55,15 @@ export class TransactionRoutingModule { }
     TransactionDetailsComponent,
     AccelerateCheckout,
     AccelerateFeeGraphComponent,
+    TransactionRawComponent,
+    CpfpInfoComponent,
   ],
   exports: [
     TransactionComponent,
     TransactionDetailsComponent,
     AccelerateCheckout,
     AccelerateFeeGraphComponent,
+    CpfpInfoComponent,
   ]
 })
 export class TransactionModule { }

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

@@ -37,6 +37,7 @@ export class TransactionsListComponent implements OnInit, OnChanges {
   @Input() addresses: string[] = [];
   @Input() rowLimit = 12;
   @Input() blockTime: number = 0; // Used for price calculation if all the transactions are in the same block
+  @Input() txPreview = false;
 
   @Output() loadMore = new EventEmitter();
 
@@ -81,7 +82,7 @@ export class TransactionsListComponent implements OnInit, OnChanges {
       this.refreshOutspends$
         .pipe(
           switchMap((txIds) => {
-            if (!this.cached) {
+            if (!this.cached && !this.txPreview) {
               // break list into batches of 50 (maximum supported by esplora)
               const batches = [];
               for (let i = 0; i < txIds.length; i += 50) {
@@ -119,7 +120,7 @@ export class TransactionsListComponent implements OnInit, OnChanges {
         ),
         this.refreshChannels$
           .pipe(
-            filter(() => this.stateService.networkSupportsLightning()),
+            filter(() => this.stateService.networkSupportsLightning() && !this.txPreview),
             switchMap((txIds) => this.apiService.getChannelByTxIds$(txIds)),
             catchError((error) => {
               // handle 404
@@ -187,7 +188,10 @@ export class TransactionsListComponent implements OnInit, OnChanges {
       }
 
       this.transactionsLength = this.transactions.length;
+      
+      if (!this.txPreview) {
         this.cacheService.setTxCache(this.transactions);
+      }
 
       const confirmedTxs = this.transactions.filter((tx) => tx.status.confirmed).length;
       this.transactions.forEach((tx) => {
@@ -351,7 +355,7 @@ export class TransactionsListComponent implements OnInit, OnChanges {
   }
 
   loadMoreInputs(tx: Transaction): void {
-    if (!tx['@vinLoaded']) {
+    if (!tx['@vinLoaded'] && !this.txPreview) {
       this.electrsApiService.getTransaction$(tx.txid)
         .subscribe((newTx) => {
           tx['@vinLoaded'] = true;

frontend/src/app/route-guards.ts

@@ -14,7 +14,7 @@ class GuardService {
   trackerGuard(route: Route, segments: UrlSegment[]): boolean {
     const preferredRoute = this.router.getCurrentNavigation()?.extractedUrl.queryParams?.mode;
     const path = this.router.getCurrentNavigation()?.extractedUrl.root.children.primary.segments;
-    return (preferredRoute === 'status' || (preferredRoute !== 'details' && this.navigationService.isInitialLoad())) && window.innerWidth <= 767.98 && !(path.length === 2 && ['push', 'test'].includes(path[1].path));
+    return (preferredRoute === 'status' || (preferredRoute !== 'details' && this.navigationService.isInitialLoad())) && window.innerWidth <= 767.98 && !(path.length === 2 && ['push', 'test', 'preview'].includes(path[1].path));
   }
 }
 

frontend/src/app/services/api.service.ts

@@ -565,6 +565,14 @@ export class ApiService {
     return this.httpClient.post(this.apiBaseUrl + this.apiBasePath + '/api/v1/acceleration/request/' + txid, '');
   }
 
+  getPrevouts$(outpoints: {txid: string; vout: number}[]): Observable<any> {
+    return this.httpClient.post(this.apiBaseUrl + this.apiBasePath + '/api/v1/prevouts', outpoints);
+  }
+
+  getCpfpLocalTx$(tx: any[]): Observable<CpfpInfo[]> {
+    return this.httpClient.post<CpfpInfo[]>(this.apiBaseUrl + this.apiBasePath + '/api/v1/cpfp', tx);
+  }
+
   // Cache methods
   async setBlockAuditLoaded(hash: string) {
     this.blockAuditLoaded[hash] = true;

frontend/src/app/shared/components/global-footer/global-footer.component.html

@@ -76,6 +76,7 @@
           <p><a [routerLink]="['/blocks' | relativeUrl]" i18n="dashboard.recent-blocks">Recent Blocks</a></p>
           <p><a [routerLink]="['/tx/push' | relativeUrl]" i18n="shared.broadcast-transaction|Broadcast Transaction">Broadcast Transaction</a></p>
           <p><a [routerLink]="['/tx/test' | relativeUrl]" i18n="shared.test-transaction|Test Transaction">Test Transaction</a></p>
+          <p><a [routerLink]="['/tx/preview' | relativeUrl]" i18n="shared.preview-transaction|Preview Transaction">Preview Transaction</a></p>
           <p *ngIf="officialMempoolSpace"><a [routerLink]="['/lightning/group/the-mempool-open-source-project' | relativeUrl]" i18n="footer.connect-to-our-nodes">Connect to our Nodes</a></p>
           <p><a [routerLink]="['/docs/api' | relativeUrl]" i18n="footer.api-documentation">API Documentation</a></p>
         </div>

frontend/src/app/shared/components/truncate/truncate.component.html

@@ -1,6 +1,6 @@
 <span class="truncate" [style.max-width]="maxWidth ? maxWidth + 'px' : null" [style.justify-content]="textAlign" [class.inline]="inline">
     <ng-container *ngIf="link">
-      <a [routerLink]="link" [queryParams]="queryParams" class="truncate-link" [target]="external ? '_blank' : '_self'">
+      <a [routerLink]="link" [queryParams]="queryParams" class="truncate-link" [target]="external ? '_blank' : '_self'" [class.disabled]="disabled">
         <ng-container *ngIf="rtl; then rtlTruncated; else ltrTruncated;"></ng-container>
       </a>
     </ng-container>

frontend/src/app/shared/components/truncate/truncate.component.scss

@@ -37,6 +37,12 @@
     max-width: 300px;
     overflow: hidden;
   }
+
+  .disabled {
+    pointer-events: none;
+    opacity: 0.8;
+    color: #fff;
+  }
 }
 
 @media (max-width: 567px) {

frontend/src/app/shared/components/truncate/truncate.component.ts

@@ -15,6 +15,7 @@ export class TruncateComponent {
   @Input() maxWidth: number = null;
   @Input() inline: boolean = false;
   @Input() textAlign: 'start' | 'end' = 'start';
+  @Input() disabled: boolean = false;
   rtl: boolean;
 
   constructor(

frontend/src/app/shared/transaction.utils.ts

@@ -1,8 +1,9 @@
 import { TransactionFlags } from '@app/shared/filters.utils';
-import { getVarIntLength, opcodes, parseMultisigScript, isPoint } from '@app/shared/script.utils';
-import { Transaction } from '@interfaces/electrs.interface';
+import { getVarIntLength, parseMultisigScript, isPoint } from '@app/shared/script.utils';
+import { Transaction, Vin } from '@interfaces/electrs.interface';
 import { CpfpInfo, RbfInfo, TransactionStripped } from '@interfaces/node-api.interface';
 import { StateService } from '@app/services/state.service';
+import { Hash } from './sha256';
 
 // Bitcoin Core default policy settings
 const MAX_STANDARD_TX_WEIGHT = 400_000;
@@ -588,3 +589,762 @@ export function identifyPrioritizedTransactions(transactions: TransactionStrippe
 
   return { prioritized, deprioritized };
 }
+
+// Adapted from mempool backend https://github.com/mempool/mempool/blob/14e49126c3ca8416a8d7ad134a95c5e090324d69/backend/src/api/transaction-utils.ts#L254
+// Converts hex bitcoin script to ASM
+function convertScriptSigAsm(hex: string): string {
+
+  const buf = new Uint8Array(hex.length / 2);
+  for (let i = 0; i < buf.length; i++) {
+    buf[i] = parseInt(hex.substr(i * 2, 2), 16);
+  }
+
+  const b = [];
+  let i = 0;
+
+  while (i < buf.length) {
+    const op = buf[i];
+    if (op >= 0x01 && op <= 0x4e) {
+      i++;
+      let push;
+      if (op === 0x4c) {
+        push = buf[i];
+        b.push('OP_PUSHDATA1');
+        i += 1;
+      } else if (op === 0x4d) {
+        push = buf[i] | (buf[i + 1] << 8);
+        b.push('OP_PUSHDATA2');
+        i += 2;
+      } else if (op === 0x4e) {
+        push = buf[i] | (buf[i + 1] << 8) | (buf[i + 2] << 16) | (buf[i + 3] << 24);
+        b.push('OP_PUSHDATA4');
+        i += 4;
+      } else {
+        push = op;
+        b.push('OP_PUSHBYTES_' + push);
+      }
+
+      const data = buf.slice(i, i + push);
+      if (data.length !== push) {
+        break;
+      }
+
+      b.push(uint8ArrayToHexString(data));
+      i += data.length;
+    } else {
+      if (op === 0x00) {
+        b.push('OP_0');
+      } else if (op === 0x4f) {
+        b.push('OP_PUSHNUM_NEG1');
+      } else if (op === 0xb1) {
+        b.push('OP_CLTV');
+      } else if (op === 0xb2) {
+        b.push('OP_CSV');
+      } else if (op === 0xba) {
+        b.push('OP_CHECKSIGADD');
+      } else {
+        const opcode = opcodes[op];
+        if (opcode) {
+          b.push(opcode);
+        } else {
+          b.push('OP_RETURN_' + op);
+        }
+      }
+      i += 1;
+    }
+  }
+
+  return b.join(' ');
+}
+
+// Copied from mempool backend https://github.com/mempool/mempool/blob/14e49126c3ca8416a8d7ad134a95c5e090324d69/backend/src/api/transaction-utils.ts#L327
+/**
+ * This function must only be called when we know the witness we are parsing
+ * is a taproot witness.
+ * @param witness An array of hex strings that represents the witness stack of
+ *                the input.
+ * @returns null if the witness is not a script spend, and the hex string of
+ *          the script item if it is a script spend.
+ */
+function witnessToP2TRScript(witness: string[]): string | null {
+  if (witness.length < 2) return null;
+  // Note: see BIP341 for parsing details of witness stack
+
+  // If there are at least two witness elements, and the first byte of the
+  // last element is 0x50, this last element is called annex a and
+  // is removed from the witness stack.
+  const hasAnnex = witness[witness.length - 1].substring(0, 2) === '50';
+  // If there are at least two witness elements left, script path spending is used.
+  // Call the second-to-last stack element s, the script.
+  // (Note: this phrasing from BIP341 assumes we've *removed* the annex from the stack)
+  if (hasAnnex && witness.length < 3) return null;
+  const positionOfScript = hasAnnex ? witness.length - 3 : witness.length - 2;
+  return witness[positionOfScript];
+}
+
+// Copied from mempool backend https://github.com/mempool/mempool/blob/14e49126c3ca8416a8d7ad134a95c5e090324d69/backend/src/api/transaction-utils.ts#L227
+// Fills inner_redeemscript_asm and inner_witnessscript_asm fields of fetched prevouts for decoded transactions
+export function addInnerScriptsToVin(vin: Vin): void {
+  if (!vin.prevout) {
+    return;
+  }
+
+  if (vin.prevout.scriptpubkey_type === 'p2sh') {
+    const redeemScript = vin.scriptsig_asm.split(' ').reverse()[0];
+    vin.inner_redeemscript_asm = convertScriptSigAsm(redeemScript);
+    if (vin.witness && vin.witness.length > 2) {
+      const witnessScript = vin.witness[vin.witness.length - 1];
+      vin.inner_witnessscript_asm = convertScriptSigAsm(witnessScript);
+    }
+  }
+
+  if (vin.prevout.scriptpubkey_type === 'v0_p2wsh' && vin.witness) {
+    const witnessScript = vin.witness[vin.witness.length - 1];
+    vin.inner_witnessscript_asm = convertScriptSigAsm(witnessScript);
+  }
+
+  if (vin.prevout.scriptpubkey_type === 'v1_p2tr' && vin.witness) {
+    const witnessScript = witnessToP2TRScript(vin.witness);
+    if (witnessScript !== null) {
+      vin.inner_witnessscript_asm = convertScriptSigAsm(witnessScript);
+    }
+  }
+}
+
+// Adapted from bitcoinjs-lib at https://github.com/bitcoinjs/bitcoinjs-lib/blob/32e08aa57f6a023e995d8c4f0c9fbdc5f11d1fa0/ts_src/transaction.ts#L78
+// Reads buffer of raw transaction data
+function fromBuffer(buffer: Uint8Array, network: string): Transaction {
+  let offset = 0;
+
+  function readInt8(): number {
+    if (offset + 1 > buffer.length) {
+      throw new Error('Buffer out of bounds');
+    }
+    return buffer[offset++];
+  }
+
+  function readInt16() {
+    if (offset + 2 > buffer.length) {
+      throw new Error('Buffer out of bounds');
+    }
+    const value = buffer[offset] | (buffer[offset + 1] << 8);
+    offset += 2;
+    return value;
+  }
+
+  function readInt32(unsigned = false): number {
+    if (offset + 4 > buffer.length) {
+      throw new Error('Buffer out of bounds');
+    }
+    const value = buffer[offset] | (buffer[offset + 1] << 8) | (buffer[offset + 2] << 16) | (buffer[offset + 3] << 24);
+    offset += 4;
+    if (unsigned) {
+      return value >>> 0;
+    }
+    return value;
+  }
+
+  function readInt64(): bigint {
+    if (offset + 8 > buffer.length) {
+      throw new Error('Buffer out of bounds');
+    }
+    const low = BigInt(buffer[offset] | (buffer[offset + 1] << 8) | (buffer[offset + 2] << 16) | (buffer[offset + 3] << 24));
+    const high = BigInt(buffer[offset + 4] | (buffer[offset + 5] << 8) | (buffer[offset + 6] << 16) | (buffer[offset + 7] << 24));
+    offset += 8;
+    return (high << 32n) | (low & 0xffffffffn);
+  }
+
+  function readVarInt(): bigint {
+    const first = readInt8();
+    if (first < 0xfd) {
+      return BigInt(first);
+    } else if (first === 0xfd) {
+      return BigInt(readInt16());
+    } else if (first === 0xfe) {
+      return BigInt(readInt32(true));
+    } else if (first === 0xff) {
+      return readInt64();
+    } else {
+      throw new Error("Invalid VarInt prefix");
+    }
+  }
+
+  function readSlice(n: number | bigint): Uint8Array {
+    const length = Number(n);
+    if (offset + length > buffer.length) {
+      throw new Error('Cannot read slice out of bounds');
+    }
+    const slice = buffer.slice(offset, offset + length);
+    offset += length;
+    return slice;
+  }
+
+  function readVarSlice(): Uint8Array {
+    return readSlice(readVarInt());
+  }
+
+  function readVector(): Uint8Array[] {
+    const count = readVarInt();
+    const vector = [];
+    for (let i = 0; i < count; i++) {
+      vector.push(readVarSlice());
+    }
+    return vector;
+  }
+
+  // Parse raw transaction
+  const tx = {
+    status: {
+      confirmed: null,
+      block_height: null,
+      block_hash: null,
+      block_time: null,
+    }
+  } as Transaction;
+  
+  tx.version = readInt32();
+
+  const marker = readInt8();
+  const flag = readInt8();
+
+  let hasWitnesses = false;
+  if (
+    marker === 0x00 &&
+    flag === 0x01
+  ) {
+    hasWitnesses = true;
+  } else {
+    offset -= 2;
+  }
+
+  const vinLen = readVarInt();
+  tx.vin = [];
+  for (let i = 0; i < vinLen; ++i) {
+    const txid = uint8ArrayToHexString(readSlice(32).reverse());
+    const vout = readInt32(true);
+    const scriptsig = uint8ArrayToHexString(readVarSlice());
+    const sequence = readInt32(true);
+    const is_coinbase = txid === '0'.repeat(64);
+    const scriptsig_asm = convertScriptSigAsm(scriptsig);
+    tx.vin.push({ txid, vout, scriptsig, sequence, is_coinbase, scriptsig_asm, prevout: null });
+  }
+
+  const voutLen = readVarInt();
+  tx.vout = [];
+  for (let i = 0; i < voutLen; ++i) {
+    const value = Number(readInt64());
+    const scriptpubkeyArray = readVarSlice();
+    const scriptpubkey = uint8ArrayToHexString(scriptpubkeyArray)
+    const scriptpubkey_asm = convertScriptSigAsm(scriptpubkey);
+    const toAddress = scriptPubKeyToAddress(scriptpubkey, network);
+    const scriptpubkey_type = toAddress.type;
+    const scriptpubkey_address = toAddress?.address;
+    tx.vout.push({ value, scriptpubkey, scriptpubkey_asm, scriptpubkey_type, scriptpubkey_address });
+  }
+
+  let witnessSize = 0;
+  if (hasWitnesses) {
+    const startOffset = offset;
+    for (let i = 0; i < vinLen; ++i) {
+      tx.vin[i].witness = readVector().map(uint8ArrayToHexString);
+    }
+    witnessSize = offset - startOffset + 2;
+  }
+
+  tx.locktime = readInt32(true);
+
+  if (offset !== buffer.length) {
+    throw new Error('Transaction has unexpected data');
+  }
+  
+  tx.size = buffer.length;
+  tx.weight = (tx.size - witnessSize) * 3 + tx.size;
+
+  tx.txid = txid(tx);
+
+  return tx;
+}
+
+export function decodeRawTransaction(rawtx: string, network: string): Transaction {
+  if (!rawtx.length || rawtx.length % 2 !== 0 || !/^[0-9a-fA-F]*$/.test(rawtx)) {
+    throw new Error('Invalid hex string');
+  }
+
+  const buffer = new Uint8Array(rawtx.length / 2);
+  for (let i = 0; i < rawtx.length; i += 2) {
+    buffer[i / 2] = parseInt(rawtx.substring(i, i + 2), 16);
+  }
+
+  return fromBuffer(buffer, network);
+}
+
+function serializeTransaction(tx: Transaction): Uint8Array {
+  const result: number[] = [];
+
+  // Add version
+  result.push(...intToBytes(tx.version, 4));
+
+  // Add input count and inputs
+  result.push(...varIntToBytes(tx.vin.length));
+  for (const input of tx.vin) {
+    result.push(...hexStringToUint8Array(input.txid).reverse());
+    result.push(...intToBytes(input.vout, 4));
+    const scriptSig = hexStringToUint8Array(input.scriptsig);
+    result.push(...varIntToBytes(scriptSig.length));
+    result.push(...scriptSig);
+    result.push(...intToBytes(input.sequence, 4));
+  }
+
+  // Add output count and outputs
+  result.push(...varIntToBytes(tx.vout.length));
+  for (const output of tx.vout) {
+    result.push(...bigIntToBytes(BigInt(output.value), 8));
+    const scriptPubKey = hexStringToUint8Array(output.scriptpubkey);
+    result.push(...varIntToBytes(scriptPubKey.length));
+    result.push(...scriptPubKey);
+  }
+
+  // Add locktime
+  result.push(...intToBytes(tx.locktime, 4));
+
+  return new Uint8Array(result);
+}
+
+function txid(tx: Transaction): string {
+  const serializedTx = serializeTransaction(tx);
+  const hash1 = new Hash().update(serializedTx).digest();
+  const hash2 = new Hash().update(hash1).digest();
+  return uint8ArrayToHexString(hash2.reverse());
+}
+
+// Copied from mempool backend https://github.com/mempool/mempool/blob/14e49126c3ca8416a8d7ad134a95c5e090324d69/backend/src/api/transaction-utils.ts#L177
+export function countSigops(transaction: Transaction): number {
+  let sigops = 0;
+
+  for (const input of transaction.vin) {
+    if (input.scriptsig_asm) {
+      sigops += countScriptSigops(input.scriptsig_asm, true);
+    }
+    if (input.prevout) {
+      switch (true) {
+        case input.prevout.scriptpubkey_type === 'p2sh' && input.witness?.length === 2 && input.scriptsig && input.scriptsig.startsWith('160014'):
+        case input.prevout.scriptpubkey_type === 'v0_p2wpkh':
+          sigops += 1;
+          break;
+
+        case input.prevout?.scriptpubkey_type === 'p2sh' && input.witness?.length && input.scriptsig && input.scriptsig.startsWith('220020'):
+        case input.prevout.scriptpubkey_type === 'v0_p2wsh':
+          if (input.witness?.length) {
+            sigops += countScriptSigops(convertScriptSigAsm(input.witness[input.witness.length - 1]), false, true);
+          }
+          break;
+
+        case input.prevout.scriptpubkey_type === 'p2sh':
+          if (input.inner_redeemscript_asm) {
+            sigops += countScriptSigops(input.inner_redeemscript_asm);
+          }
+          break;
+      }
+    }
+  }
+
+  for (const output of transaction.vout) {
+    if (output.scriptpubkey_asm) {
+      sigops += countScriptSigops(output.scriptpubkey_asm, true);
+    }
+  }
+
+  return sigops;
+}
+
+function scriptPubKeyToAddress(scriptPubKey: string, network: string): { address: string, type: string } {
+  // P2PKH
+  if (/^76a914[0-9a-f]{40}88ac$/.test(scriptPubKey)) {
+    return { address: p2pkh(scriptPubKey.substring(6, 6 + 40), network), type: 'p2pkh' };
+  }
+  // P2PK
+  if (/^21[0-9a-f]{66}ac$/.test(scriptPubKey) || /^41[0-9a-f]{130}ac$/.test(scriptPubKey)) {
+    return { address: null, type: 'p2pk' };
+  }
+  // P2SH
+  if (/^a914[0-9a-f]{40}87$/.test(scriptPubKey)) {
+    return { address: p2sh(scriptPubKey.substring(4, 4 + 40), network), type: 'p2sh' };
+  }
+  // P2WPKH
+  if (/^0014[0-9a-f]{40}$/.test(scriptPubKey)) {
+    return { address: p2wpkh(scriptPubKey.substring(4, 4 + 40), network), type: 'v0_p2wpkh' };
+  }
+  // P2WSH
+  if (/^0020[0-9a-f]{64}$/.test(scriptPubKey)) {
+    return { address: p2wsh(scriptPubKey.substring(4, 4 + 64), network), type: 'v0_p2wsh' };
+  }
+  // P2TR
+  if (/^5120[0-9a-f]{64}$/.test(scriptPubKey)) {
+    return { address: p2tr(scriptPubKey.substring(4, 4 + 64), network), type: 'v1_p2tr' };
+  }
+  // multisig
+  if (/^[0-9a-f]+ae$/.test(scriptPubKey)) {
+    return { address: null, type: 'multisig' };
+  }
+  // anchor
+  if (scriptPubKey === '51024e73') {
+    return { address: p2a(network), type: 'anchor' };
+  }
+  // op_return
+  if (/^6a/.test(scriptPubKey)) {
+    return { address: null, type: 'op_return' };
+  }
+  return { address: null, type: 'unknown' };
+}
+
+function p2pkh(pubKeyHash: string, network: string): string {
+  const pubkeyHashArray = hexStringToUint8Array(pubKeyHash);
+  const version = ['testnet', 'testnet4', 'signet'].includes(network) ? 0x6f : 0x00;
+  const versionedPayload = Uint8Array.from([version, ...pubkeyHashArray]);
+  const hash1 = new Hash().update(versionedPayload).digest();
+  const hash2 = new Hash().update(hash1).digest();
+  const checksum = hash2.slice(0, 4);
+  const finalPayload = Uint8Array.from([...versionedPayload, ...checksum]);
+  const bitcoinAddress = base58Encode(finalPayload);
+  return bitcoinAddress;
+}
+
+function p2sh(scriptHash: string, network: string): string {
+  const scriptHashArray = hexStringToUint8Array(scriptHash);
+  const version = ['testnet', 'testnet4', 'signet'].includes(network) ? 0xc4 : 0x05;
+  const versionedPayload = Uint8Array.from([version, ...scriptHashArray]);
+  const hash1 = new Hash().update(versionedPayload).digest();
+  const hash2 = new Hash().update(hash1).digest();
+  const checksum = hash2.slice(0, 4);
+  const finalPayload = Uint8Array.from([...versionedPayload, ...checksum]);
+  const bitcoinAddress = base58Encode(finalPayload);
+  return bitcoinAddress;
+}
+
+function p2wpkh(pubKeyHash: string, network: string): string {
+  const pubkeyHashArray = hexStringToUint8Array(pubKeyHash);
+  const hrp = ['testnet', 'testnet4', 'signet'].includes(network) ? 'tb' : 'bc';
+  const version = 0;
+  const words = [version].concat(toWords(pubkeyHashArray));
+  const bech32Address = bech32Encode(hrp, words);
+  return bech32Address;
+}
+
+function p2wsh(scriptHash: string, network: string): string {
+  const scriptHashArray = hexStringToUint8Array(scriptHash);
+  const hrp = ['testnet', 'testnet4', 'signet'].includes(network) ? 'tb' : 'bc';
+  const version = 0;
+  const words = [version].concat(toWords(scriptHashArray));
+  const bech32Address = bech32Encode(hrp, words);
+  return bech32Address;
+}
+
+function p2tr(pubKeyHash: string, network: string): string {
+  const pubkeyHashArray = hexStringToUint8Array(pubKeyHash);
+  const hrp = ['testnet', 'testnet4', 'signet'].includes(network) ? 'tb' : 'bc';
+  const version = 1;
+  const words = [version].concat(toWords(pubkeyHashArray));
+  const bech32Address = bech32Encode(hrp, words, 0x2bc830a3);
+  return bech32Address;
+}
+
+function p2a(network: string): string {
+  const pubkeyHashArray = hexStringToUint8Array('4e73');
+  const hrp = ['testnet', 'testnet4', 'signet'].includes(network) ? 'tb' : 'bc';
+  const version = 1;
+  const words = [version].concat(toWords(pubkeyHashArray));
+  const bech32Address = bech32Encode(hrp, words, 0x2bc830a3);
+  return bech32Address;
+}
+
+// base58 encoding
+function base58Encode(data: Uint8Array): string {
+  const BASE58_ALPHABET = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz";
+
+  let hexString = Array.from(data)
+    .map(byte => byte.toString(16).padStart(2, '0'))
+    .join('');
+  
+  let num = BigInt("0x" + hexString);
+
+  let encoded = "";
+  while (num > 0) {
+    const remainder = Number(num % 58n);
+    num = num / 58n;
+    encoded = BASE58_ALPHABET[remainder] + encoded;
+  }
+
+  for (let byte of data) {
+    if (byte === 0) {
+      encoded = "1" + encoded;
+    } else {
+      break;
+    }
+  }
+
+  return encoded;
+}
+
+// bech32 encoding
+// Adapted from https://github.com/bitcoinjs/bech32/blob/5ceb0e3d4625561a459c85643ca6947739b2d83c/src/index.ts
+function bech32Encode(prefix: string, words: number[], constant: number = 1) {
+  const BECH32_ALPHABET = "qpzry9x8gf2tvdw0s3jn54khce6mua7l";
+
+  const checksum = createChecksum(prefix, words, constant);
+  const combined = words.concat(checksum);
+  let result = prefix + '1';
+  for (let i = 0; i < combined.length; ++i) {
+    result += BECH32_ALPHABET.charAt(combined[i]);
+  }
+  return result;
+}
+
+function polymodStep(pre) {
+  const GENERATORS = [0x3b6a57b2, 0x26508e6d, 0x1ea119fa, 0x3d4233dd, 0x2a1462b3];
+  const b = pre >> 25;
+  return (
+    ((pre & 0x1ffffff) << 5) ^
+    ((b & 1 ? GENERATORS[0] : 0) ^
+      (b & 2 ? GENERATORS[1] : 0) ^
+      (b & 4 ? GENERATORS[2] : 0) ^
+      (b & 8 ? GENERATORS[3] : 0) ^
+      (b & 16 ? GENERATORS[4] : 0))
+  );
+}
+
+function prefixChk(prefix) {
+  let chk = 1;
+  for (let i = 0; i < prefix.length; ++i) {
+    const c = prefix.charCodeAt(i);
+    chk = polymodStep(chk) ^ (c >> 5);
+  }
+  chk = polymodStep(chk);
+  for (let i = 0; i < prefix.length; ++i) {
+    const c = prefix.charCodeAt(i);
+    chk = polymodStep(chk) ^ (c & 0x1f);
+  }
+  return chk;
+}
+
+function createChecksum(prefix: string, words: number[], constant: number) {
+  const POLYMOD_CONST = constant;
+  let chk = prefixChk(prefix);
+  for (let i = 0; i < words.length; ++i) {
+    const x = words[i];
+    chk = polymodStep(chk) ^ x;
+  }
+  for (let i = 0; i < 6; ++i) {
+    chk = polymodStep(chk);
+  }
+  chk ^= POLYMOD_CONST;
+
+  const checksum = [];
+  for (let i = 0; i < 6; ++i) {
+    checksum.push((chk >> (5 * (5 - i))) & 31);
+  }
+  return checksum;
+}
+
+function convertBits(data, fromBits, toBits, pad) {
+  let acc = 0;
+  let bits = 0;
+  const ret = [];
+  const maxV = (1 << toBits) - 1;
+
+  for (let i = 0; i < data.length; ++i) {
+    const value = data[i];
+    if (value < 0 || value >> fromBits) throw new Error('Invalid value');
+    acc = (acc << fromBits) | value;
+    bits += fromBits;
+    while (bits >= toBits) {
+      bits -= toBits;
+      ret.push((acc >> bits) & maxV);
+    }
+  }
+  if (pad) {
+    if (bits > 0) {
+      ret.push((acc << (toBits - bits)) & maxV);
+    }
+  } else if (bits >= fromBits || ((acc << (toBits - bits)) & maxV)) {
+    throw new Error('Invalid data');
+  }
+  return ret;
+}
+
+function toWords(bytes) {
+  return convertBits(bytes, 8, 5, true);
+}
+
+// Helper functions
+function uint8ArrayToHexString(uint8Array: Uint8Array): string {
+  return Array.from(uint8Array).map(byte => byte.toString(16).padStart(2, '0')).join('');
+}
+
+function hexStringToUint8Array(hex: string): Uint8Array {
+  const buf = new Uint8Array(hex.length / 2);
+  for (let i = 0; i < buf.length; i++) {
+    buf[i] = parseInt(hex.substr(i * 2, 2), 16);
+  }
+  return buf;
+}
+
+function intToBytes(value: number, byteLength: number): number[] {
+  const bytes = [];
+  for (let i = 0; i < byteLength; i++) {
+    bytes.push((value >> (8 * i)) & 0xff);
+  }
+  return bytes;
+}
+
+function bigIntToBytes(value: bigint, byteLength: number): number[] {
+  const bytes = [];
+  for (let i = 0; i < byteLength; i++) {
+    bytes.push(Number((value >> BigInt(8 * i)) & 0xffn));
+  }
+  return bytes;
+}
+
+function varIntToBytes(value: number | bigint): number[] {
+  const bytes = [];
+
+  if (typeof value === 'number') {
+    if (value < 0xfd) {
+      bytes.push(value);
+    } else if (value <= 0xffff) {
+      bytes.push(0xfd, value & 0xff, (value >> 8) & 0xff);
+    } else if (value <= 0xffffffff) {
+      bytes.push(0xfe, ...intToBytes(value, 4));
+    }
+  } else {
+    if (value < 0xfdn) {
+      bytes.push(Number(value));
+    } else if (value <= 0xffffn) {
+      bytes.push(0xfd, Number(value & 0xffn), Number((value >> 8n) & 0xffn));
+    } else if (value <= 0xffffffffn) {
+      bytes.push(0xfe, ...intToBytes(Number(value), 4));
+    } else {
+      bytes.push(0xff, ...bigIntToBytes(value, 8));
+    }
+  }
+
+  return bytes;
+}
+
+// Inversed the opcodes object from https://github.com/mempool/mempool/blob/14e49126c3ca8416a8d7ad134a95c5e090324d69/backend/src/utils/bitcoin-script.ts#L1
+const opcodes = {
+  0: 'OP_0',
+  76: 'OP_PUSHDATA1',
+  77: 'OP_PUSHDATA2',
+  78: 'OP_PUSHDATA4',
+  79: 'OP_PUSHNUM_NEG1',
+  80: 'OP_RESERVED',
+  81: 'OP_PUSHNUM_1',
+  82: 'OP_PUSHNUM_2',
+  83: 'OP_PUSHNUM_3',
+  84: 'OP_PUSHNUM_4',
+  85: 'OP_PUSHNUM_5',
+  86: 'OP_PUSHNUM_6',
+  87: 'OP_PUSHNUM_7',
+  88: 'OP_PUSHNUM_8',
+  89: 'OP_PUSHNUM_9',
+  90: 'OP_PUSHNUM_10',
+  91: 'OP_PUSHNUM_11',
+  92: 'OP_PUSHNUM_12',
+  93: 'OP_PUSHNUM_13',
+  94: 'OP_PUSHNUM_14',
+  95: 'OP_PUSHNUM_15',
+  96: 'OP_PUSHNUM_16',
+  97: 'OP_NOP',
+  98: 'OP_VER',
+  99: 'OP_IF',
+  100: 'OP_NOTIF',
+  101: 'OP_VERIF',
+  102: 'OP_VERNOTIF',
+  103: 'OP_ELSE',
+  104: 'OP_ENDIF',
+  105: 'OP_VERIFY',
+  106: 'OP_RETURN',
+  107: 'OP_TOALTSTACK',
+  108: 'OP_FROMALTSTACK',
+  109: 'OP_2DROP',
+  110: 'OP_2DUP',
+  111: 'OP_3DUP',
+  112: 'OP_2OVER',
+  113: 'OP_2ROT',
+  114: 'OP_2SWAP',
+  115: 'OP_IFDUP',
+  116: 'OP_DEPTH',
+  117: 'OP_DROP',
+  118: 'OP_DUP',
+  119: 'OP_NIP',
+  120: 'OP_OVER',
+  121: 'OP_PICK',
+  122: 'OP_ROLL',
+  123: 'OP_ROT',
+  124: 'OP_SWAP',
+  125: 'OP_TUCK',
+  126: 'OP_CAT',
+  127: 'OP_SUBSTR',
+  128: 'OP_LEFT',
+  129: 'OP_RIGHT',
+  130: 'OP_SIZE',
+  131: 'OP_INVERT',
+  132: 'OP_AND',
+  133: 'OP_OR',
+  134: 'OP_XOR',
+  135: 'OP_EQUAL',
+  136: 'OP_EQUALVERIFY',
+  137: 'OP_RESERVED1',
+  138: 'OP_RESERVED2',
+  139: 'OP_1ADD',
+  140: 'OP_1SUB',
+  141: 'OP_2MUL',
+  142: 'OP_2DIV',
+  143: 'OP_NEGATE',
+  144: 'OP_ABS',
+  145: 'OP_NOT',
+  146: 'OP_0NOTEQUAL',
+  147: 'OP_ADD',
+  148: 'OP_SUB',
+  149: 'OP_MUL',
+  150: 'OP_DIV',
+  151: 'OP_MOD',
+  152: 'OP_LSHIFT',
+  153: 'OP_RSHIFT',
+  154: 'OP_BOOLAND',
+  155: 'OP_BOOLOR',
+  156: 'OP_NUMEQUAL',
+  157: 'OP_NUMEQUALVERIFY',
+  158: 'OP_NUMNOTEQUAL',
+  159: 'OP_LESSTHAN',
+  160: 'OP_GREATERTHAN',
+  161: 'OP_LESSTHANOREQUAL',
+  162: 'OP_GREATERTHANOREQUAL',
+  163: 'OP_MIN',
+  164: 'OP_MAX',
+  165: 'OP_WITHIN',
+  166: 'OP_RIPEMD160',
+  167: 'OP_SHA1',
+  168: 'OP_SHA256',
+  169: 'OP_HASH160',
+  170: 'OP_HASH256',
+  171: 'OP_CODESEPARATOR',
+  172: 'OP_CHECKSIG',
+  173: 'OP_CHECKSIGVERIFY',
+  174: 'OP_CHECKMULTISIG',
+  175: 'OP_CHECKMULTISIGVERIFY',
+  176: 'OP_NOP1',
+  177: 'OP_CHECKLOCKTIMEVERIFY',
+  178: 'OP_CHECKSEQUENCEVERIFY',
+  179: 'OP_NOP4',
+  180: 'OP_NOP5',
+  181: 'OP_NOP6',
+  182: 'OP_NOP7',
+  183: 'OP_NOP8',
+  184: 'OP_NOP9',
+  185: 'OP_NOP10',
+  186: 'OP_CHECKSIGADD',
+  253: 'OP_PUBKEYHASH',
+  254: 'OP_PUBKEY',
+  255: 'OP_INVALIDOPCODE',
+};