GBT: Add informational founders' reward value to coinbasetxn

src/rpcmining.cpp

@@ -594,6 +594,11 @@ Value getblocktemplate(const Array& params, bool fHelp)
         entry.push_back(Pair("sigops", pblocktemplate->vTxSigOps[index_in_template]));
 
         if (tx.IsCoinBase()) {
+            // Show founders' reward if it is required
+            if (pblock->vtx[0].vout.size() > 1) {
+                // Correct this if GetBlockTemplate changes the order
+                entry.push_back(Pair("foundersreward", (int64_t)tx.vout[1].nValue));
+            }
             entry.push_back(Pair("required", true));
             txCoinbase = entry;
         } else {