message: Add condition to serialize sigma data on block
diff: @@ -466,7 +466,7 @@ public:
  READWRITE(spentSerials);
  }
  - if (!(nType & SER_GETHASH)) {
  + if (!(nType & SER_GETHASH) && nHeight >= Params().GetConsensus().nSigmaStartBlock) {
  READWRITE(mintedPubCoinsV3);
  READWRITE(spentSerialsV3);
  }
  