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

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TXID is the 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.

  • So it's the digital signature? Is there a comprehensive website that I can use to read up on bitcoin? From a programmers point of view. – Kyle Graham Mar 15 '18 at 20:28
  • Yeah, There's a book called Mastering Bitcoin by Andreas Antonopoulos , Best book ever. – Adam Mar 15 '18 at 20:29
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The TXID is the hash of the transaction.

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