message: Ensure the block signature is lows
diff: @@ -3354,8 +3354,8 @@ bool SignBlock(CBlock& block, CWallet& wallet, const CAmount& nTotalFees)
  block.vtx[1] = MakeTransactionRef(std::move(txCoinStake));
  block.hashMerkleRoot = BlockMerkleRoot(block);
  - // append a signature to our block
  - return key.Sign(block.GetHash(), block.vchBlockSig);
  + // append a signature to our block and ensure that is LowS
  + return key.Sign(block.GetHash(), block.vchBlockSig) && EnsureLowS(block.vchBlockSig);
  }
  }
  nLastCoinStakeSearchInterval = nSearchTime - nLastCoinStakeSearchTime;
  