transactionids

Transaction IDs, or transaction identifiers, are unique tokens assigned to individual transactions within a system to enable reference, tracking, reconciliation, and auditing. Each ID should uniquely identify a single transaction and remain stable for the life of the transaction record.

In different domains, IDs may be generated in various ways: as numeric sequences, as UUIDs (universally unique identifiers), or as cryptographic hashes derived from the transaction contents.

Common formats include 64-character hexadecimal strings (for example, in many blockchains, a transaction hash such as a txid is a 256-bit hash shown as 64 hex digits).

In distributed and database systems, IDs may be assigned by a central authority, a distributed generator, or created as random or pseudo-random values with sufficient entropy to avoid collisions.

Usage: IDs support lookups, joins, auditing, and idempotent request handling. They also enable cross-system reconciliation, where each system records the same transaction and uses the same ID to correlate data.

Security and privacy: IDs should avoid embedding sensitive data. They should be unpredictable when used in untrusted contexts to reduce guessing or enumeration. Size and format may affect performance and storage; choose an approach that balances uniqueness, legality, and readability.