Transaction ID (txid)
A txid or Transaction ID is a string of letters and numbers that identifies a specific transaction on the blockchain.
A txid or Transaction ID is a string of letters and numbers that identifies a specific transaction on the blockchain. It can be used to look up a transaction on a node or block explorer. An example of a txid is this id that belongs to the first transaction in Bitcoin’s Genesis block: 4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b Note that while both a txid and a bitcoin address look like a long string of letters and numbers, they are not the same thing, and the two should never be mixed up.
On a technical level, a transaction ID is the double SHA-256 hash of a transaction. When signing a transaction, it is the txid that is signed. Signing the txid ensures that if any part of the transaction changes, the transaction ID changes, and the signature is rendered invalid.
A txid is not always a hash of the entire transaction. Since a signature cannot sign itself, signatures are not included in the txid, and thus signatures can be changed after their creation, sometimes without being invalidated. Before SegWit, this allowed a txid to change after the transaction was signed, a problem called transaction malleability.
Transaction ID (txid) is a concept relevant to Bitcoin, finance, or blockchain technology that investors should understand. Onramp's comprehensive Bitcoin glossary provides clear explanations of Transaction ID (txid) and hundreds of other terms to support informed investment decisions.
Frequently Asked Questions
What is Transaction ID (txid)?
Transaction ID (txid) is a term used in Bitcoin, finance, or blockchain technology. Understanding Transaction ID (txid) helps investors and enthusiasts build a stronger foundation of knowledge about digital assets and financial markets.
Why is Transaction ID (txid) important?
Transaction ID (txid) is relevant to understanding how Bitcoin, financial markets, or blockchain technology operates. Knowledge of such concepts helps investors make better-informed decisions about their portfolios.
Where can investors learn more about Transaction ID (txid)?
Onramp's Bitcoin glossary offers detailed, accessible explanations of Transaction ID (txid) and over 500 other terms related to Bitcoin, finance, and blockchain technology for investors at all experience levels.
