Apache‑2.0 · open source Research GitHub

Receipts for AI output.

A signed, tamper-evident record of an AI output, re‑run offline against your own copy — you trust the recomputation, not the issuer.

See it run Read the format

Re-run every check yourself.

veriker
$python -m veriker.cli.verify --bundle-dir bundle/ --verdict-out verdict.json
input_manifest_sha25681dfae61b60e…af09
checksfile_integrityPASS
spec_sha_pinningPASS
stateOKexit_code 0 · 12 checks passed

Proves the output matches its receipt, untampered.

The output carries its own proof.

A valid receipt proves the bytes match what was emitted — recompute it yourself and watch it re‑derive, or watch it break.

One format. Open by design.

01 — format Portable receipt One signed COSE file, re-checkable anywhere.
02 — check Re-derivation Recompute and compare, byte for byte.
03 — license Apache-2.0 The license the verifier is published under.

The engine is open.

The reference verifier, the receipt format, and the verification spec are published on GitHub under Apache-2.0.

View the source on GitHub
Open verification standard · Apache-2.0 · Python 3.11+