sign method

@override SolTxData sign()

Implementation

@override
SolTxData sign() {
  txData.signature = wallet.sign(txData.transaction);
  if (txData.initTokenAddress != null) {
    txData.initTokenAddressSignature = wallet.sign(txData.initTokenAddress!);
  }
  txData.isSigned = true;
  return txData;
}