Transaction ID (TXID)
A transaction's unique identifier, usually derived by hashing its serialized contents according to the chain's rules.
- Acronym
- TXID
- Also known as
- Tx HashTransaction Hash
A TXID is the identifier wallets and block explorers use to look up a transaction. On Bitcoin-style chains it is commonly the double SHA-256 hash of the serialized transaction without witness data.
TXIDs are useful references, but they are not settlement guarantees. Before confirmation, transactions may be dropped, conflicted, or replaced depending on network policy, and historical malleability issues could change IDs.
Related terms
3 linkedExplore connected entries beyond the alphabetical index.
Transaction
→A signed data message that asks a blockchain to transfer value, execute code, or update state.
SHA-256
→A 256-bit cryptographic hash function used for transaction IDs, Merkle trees, and proof of work.
Block Explorer
→A website or tool for viewing blockchain data like transactions, addresses, and blocks.
All terms and definitions may update as the Cryptionary improves.
