Replace cached blocks on reorg, serve stale blocks

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

@@ -29,6 +29,7 @@ class BitcoinApi implements AbstractBitcoinApi {
       weight: block.weight,
       previousblockhash: block.previousblockhash,
       mediantime: block.mediantime,
+      stale: block.confirmations === -1,
     };
   }
 

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

@@ -89,6 +89,7 @@ export namespace IEsploraApi {
     weight: number;
     previousblockhash: string;
     mediantime: number;
+    stale: boolean;
   }
 
   export interface Address {