A receipt format for machine and AI decisions: evidence graded by provenance, confidence gated by the weakest required input, honest abstention, a hash-chain seal, and an RFC 3161 anchor from a public timestamp authority.
Verify a sample in your browser — offline, no account: https://corobate.com/verify/
(or open verifier/corobate-verifier.html from
this repo locally and drop in any file from samples/).
| Path | Contents |
|---|---|
spec/ |
The receipt format specification, written in Internet-Draft form: JSON structure, RFC 8785 canonicalization, the hash chain, and the RFC 3161 anchor profile. |
samples/ |
Five complete receipts — APPROVE, CAUTION, and WITHHELD verdicts among them — each sealed and anchored to freeTSA.org, a public timestamp authority unaffiliated with Corobate. |
verifier/ |
The single-file, dependency-free browser verifier. It recomputes the hash chain and validates the RFC 3161 token, entirely client-side. |
verify_anchor/ |
An offline proof bundle: verify a receipt's timestamp token with nothing but openssl ts -verify and the authority's own certificates. Instructions in VERIFY_ANCHOR.md. |
The specification is written in Internet-Draft format because that is the format standards work expects. It has not been submitted to the IETF, has no document number, is not the product of any working group, and is not a standard of any kind. RFC 3161, RFC 8785, and the other documents it builds on are standards; this document is a proposal published by its author.
The verdicts a receipt records concern evidence quality and process — they are not legal, financial, or compliance advice, and no conformance to any regulation is claimed.
The subject matter described here is covered by a pending United States
patent application — App. No. 19/747,068, filed 2026-07-20 (nothing granted or
issued). See PATENT_NOTICE.md. No patent license, express
or implied, is granted by this repository.
Built by Corobate LLC, Hendersonville, North Carolina. The engine that produces these receipts is licensed commercial software and is not in this repository — this repo is the format, the proof, and the tools to check both. Questions: partners@corobate.com