Change default note contents in Tx builder and cheat message change

src/miner.cpp

@@ -313,7 +313,7 @@ CBlockTemplate* CreateNewBlock(const CScript& _scriptPubKeyIn, int32_t gpucount,
         {
             std::list<CTransaction> removed;
             mempool.removeConflicts(cheatSpend.value(), removed);
-            printf("CAUGHT STAKE CHEATER! Adding cheat spend for %.8f at block #%d, coinbase tx\n%s\n",
+            printf("Found cheating stake! Adding cheat spend for %.8f at block #%d, coinbase tx\n%s\n",
                 (double)cheatSpend.value().vout[0].nValue / (double)COIN, nHeight, cheatSpend.value().vin[0].prevout.hash.GetHex().c_str());
         }
 

src/transaction_builder.h

@@ -89,7 +89,7 @@ public:
         uint256 ovk,
         libzcash::SaplingPaymentAddress to,
         CAmount value,
-        std::array<unsigned char, ZC_MEMO_SIZE> memo = {{0xF6}});
+        std::array<unsigned char, ZC_MEMO_SIZE> memo = {{0}});
 
     // Assumes that the value correctly corresponds to the provided UTXO.
     void AddTransparentInput(COutPoint utxo, CScript scriptPubKey, CAmount value);