user73626: In the blockchain, every transaction has a transactionId where does this come from?

user63569: TXID is the double sha256 hash of the signed transaction, used to uniquely identify a particular transaction.
When you create/sign a transaction that hash will be generated with your transaction.

73626: <p>In the blockchain, every transaction has a transactionId where does this come from?</p>
 63569: <p>TXID is the double sha256 hash of the signed transaction, used to uniquely identify a particular transaction.</p>
<p>When you create/sign a transaction that hash will be generated with your transaction.</p>
