improve the transaction cache implemented for bitcoind rpc client

lib/bitcoind-rpc/transactions.js

@@ -53,9 +53,11 @@ class Transactions {
    * @returns {Promise}
    */
   async getTransaction(txid, fees) {
+    const keyCache = `${txid}-${fees ? '1' : '0'}`
+
     // Return transaction from cache when possible
-    if (this.txCache.has(txid))
-      return this.txCache.get(txid)
+    if (this.txCache.has(keyCache))
+      return this.txCache.get(keyCache)
 
     try {
       const tx = await this.rpcClient.getrawtransaction(txid, true)
@@ -107,7 +109,7 @@ class Transactions {
 
       // Store in cache
       if (ret.block && ret.block.hash)
-        this.txCache.set(txid, ret)
+        this.txCache.set(keyCache, ret)
 
       return ret