message: fully initialize member variables when setting the witness data
diff: @@ -20,6 +20,7 @@ CoinWitnessData::CoinWitnessData()
  CoinWitnessData::CoinWitnessData(CZerocoinMint& mint)
  {
  + SetNull();
  denom = mint.GetDenomination();
  isV1 = libzerocoin::ExtractVersionFromSerial(mint.GetSerialNumber()) < libzerocoin::PrivateCoin::PUBKEY_VERSION;
  libzerocoin::ZerocoinParams* paramsCoin = Params().Zerocoin_Params(isV1);
  