Open Inter-Vendor Audit Record Format.

Vendor-neutral signed audit schema with cross-vendor trust-bundle federation. 20 claims.

A vendor-neutral interoperable audit-record format for sovereign AI systems. Defines a canonical serialisation schema with a fixed ordered field set (originator identifier, originator public-key fingerprint, prior-record hash pointer, monotonically-increasing index, timestamp, event type, event payload, hardware-attestation quote reference, post-quantum signature). Cross-vendor trust-bundle federation lets any conformant verifier consume a chain emitted by any conformant producer without vendor-specific verification logic. Filed 4 May 2026 as GB2610413.3 (minimal — full claims/abstract upload queued Wed 6 May).