public String transactionHash() {
    final byte[] signedTx = createSignedTransactionData();
    final byte[] txHash = org.web3j.crypto.Hash.sha3(signedTx);
    return Numeric.toHexString(txHash);
  }
Number of GAS units that the transaction will cost.
acceptance-tests/dsl/src/main/java/org/hyperledger/besu/tests/acceptance/dsl/transaction/account/TransferTransaction.java