recompute-kit-verify

Recompute a recompute-kit receipt on your own machine. Trust no one — not even us.

Every recompute-kit / MCP receipt is a recompute-kit.conformance_proof_object.v0 (it embeds a receiptos.evidence_capsule.v0). This package re-derives the receipt's receipt_root locally and reads the capsule's own conformance verdict verbatim — so a receipt is only trusted once you recomputed it.

Stdlib only. No network. No dependency on us.

Install

pip install recompute-kit-verify

Use

recompute-verify receipt.json        # exit 0 = verified-good, 1 = verified-bad, 2 = UNVERIFIABLE
cat receipt.json | recompute-verify -

from recompute_kit_verify import verify_object
import json
verify_object(json.load(open("receipt.json")))
# {"status": "verified-good", "root": "0x…", "verifier_result": {"ok": true, "status": "verified"}, ...}

The tri-state (couldn't-check is its own verdict, never a silent pass)

What it checks

• Integrity — receipt_root == "0x" + sha256(JCS(receipt \ {anchor, receipt_root})) (receiptos-c14n-v0), recomputed here, compared to the stored root. A one-field tamper breaks it.
• Verdict — the capsule's own verifier_result ({ok, status}), carried verbatim; the verdict is never inferred from the root match.
• Signature — a lane reserved for signed receipts; today receipts are integrity-bound by receipt_root.

Recompute the source: https://github.com/trustless-ai/recompute-kit · mcp/receiptos.py.