refactor: use CTransactionRef in submitSolution

src/interfaces/mining.h

@@ -55,7 +55,7 @@ public:
      *
      * @returns if the block was processed, independent of block validity
      */
-    virtual bool submitSolution(uint32_t version, uint32_t timestamp, uint32_t nonce, CMutableTransaction coinbase) = 0;
+    virtual bool submitSolution(uint32_t version, uint32_t timestamp, uint32_t nonce, CTransactionRef coinbase) = 0;
 };
 
 //! Interface giving clients (RPC, Stratum v2 Template Provider in the future)

src/node/interfaces.cpp

@@ -916,16 +916,14 @@ public:
         return TransactionMerklePath(m_block_template->block, 0);
     }
 
-    bool submitSolution(uint32_t version, uint32_t timestamp, uint32_t nonce, CMutableTransaction coinbase) override
+    bool submitSolution(uint32_t version, uint32_t timestamp, uint32_t nonce, CTransactionRef coinbase) override
     {
         CBlock block{m_block_template->block};
 
-        auto cb = MakeTransactionRef(std::move(coinbase));
-
         if (block.vtx.size() == 0) {
-            block.vtx.push_back(cb);
+            block.vtx.push_back(coinbase);
         } else {
-            block.vtx[0] = cb;
+            block.vtx[0] = coinbase;
         }
 
         block.nVersion = version;