Obsigna
The reference implementation of the Agent Receipts protocol.
Tamper-evident, cryptographically signed audit trails for AI agent actions — Ed25519-signed, SHA-256 hash-chained records.
Obsigna implements the Agent Receipts open standard: a specification for producing verifiable, append-only records of what AI agents do, on whose behalf, and when. Every receipt is signed and chained so that no entry can be altered or removed without detection.
Agent Receipts protocol & specificationDocumentation coming soon.