diff --git a/backend/src/api/audit.ts b/backend/src/api/audit.ts
index 6aafc9ded..b6b36dbdc 100644
--- a/backend/src/api/audit.ts
+++ b/backend/src/api/audit.ts
@@ -1,10 +1,5 @@
 import config from '../config';
-import bitcoinApi from './bitcoin/bitcoin-api-factory';
-import { Common } from './common';
-import { TransactionExtended, MempoolBlockWithTransactions, AuditScore } from '../mempool.interfaces';
-import blocksRepository from '../repositories/BlocksRepository';
-import blocksAuditsRepository from '../repositories/BlocksAuditsRepository';
-import blocks from '../api/blocks';
+import { TransactionExtended, MempoolBlockWithTransactions } from '../mempool.interfaces';
 
 const PROPAGATION_MARGIN = 180; // in seconds, time since a transaction is first seen after which it is assumed to have propagated to all miners
 
diff --git a/backend/src/api/bitcoin/bitcoin-api-factory.ts b/backend/src/api/bitcoin/bitcoin-api-factory.ts
index f89d07b50..24916b97b 100644
--- a/backend/src/api/bitcoin/bitcoin-api-factory.ts
+++ b/backend/src/api/bitcoin/bitcoin-api-factory.ts
@@ -17,4 +17,6 @@ function bitcoinApiFactory(): AbstractBitcoinApi {
   }
 }
 
+export const bitcoinCoreApi = new BitcoinApi(bitcoinClient);
+
 export default bitcoinApiFactory();
diff --git a/backend/src/api/transaction-utils.ts b/backend/src/api/transaction-utils.ts
index 5da168584..fb5aeea42 100644
--- a/backend/src/api/transaction-utils.ts
+++ b/backend/src/api/transaction-utils.ts
@@ -1,9 +1,7 @@
-import bitcoinApi from './bitcoin/bitcoin-api-factory';
 import { TransactionExtended, TransactionMinerInfo } from '../mempool.interfaces';
 import { IEsploraApi } from './bitcoin/esplora-api.interface';
-import config from '../config';
 import { Common } from './common';
-import bitcoinClient from './bitcoin/bitcoin-client';
+import bitcoinApi, { bitcoinCoreApi } from './bitcoin/bitcoin-api-factory';
 
 class TransactionUtils {
   constructor() { }
@@ -31,7 +29,7 @@ class TransactionUtils {
   public async $getTransactionExtended(txId: string, addPrevouts = false, lazyPrevouts = false, forceCore = false): Promise<TransactionExtended> {
     let transaction: IEsploraApi.Transaction;
     if (forceCore === true) {
-      transaction  = await bitcoinClient.$getRawTransaction(txId, true);
+      transaction  = await bitcoinCoreApi.$getRawTransaction(txId, true);
     } else {
       transaction  = await bitcoinApi.$getRawTransaction(txId, false, addPrevouts, lazyPrevouts);
     }