reproducibility receipts

this output, from this input, through this build.

a reproducibility receipt is a small, portable json artifact that binds an analysis run so a third party can independently confirm where an output came from. it records the sha-256 of every input, the tool slug + the exact signed bundle hash, the parameters, the output sha-256, and a self-hash over a canonical serialization. build one below, or drop a receipt.json to re-verify it — entirely on your device.

loading the provenance registry…

verify a receipt

drop a receipt.json below. optionally drop the original input file(s) and the output file to re-confirm their hashes. everything is hashed locally in your browser — nothing is uploaded.

drop receipt.json, or click to choose

build a receipt

compose a portable receipt for a run you just did. drop the same input/output files you used — they are hashed locally — and the tool's bundle hash is read from the live provenance registry. the resulting JSON is self-hashed and re-verifiable above.

tool slug

input file(s)

drop input file(s)

output file

drop output file

parameters (JSON)

what a receipt proves

input binding — the receipt records the sha-256 of each input. re-drop the file(s) and the hashes must match, byte-for-byte.
output binding — the output sha-256 is recorded. a different output, even by one byte, fails the check.
build binding — the tool's bundle sha-256 is matched against the live /tool-bundles/provenance.json registry, the same one verified at /provenance. this ties the output to the exact, signed tool build.
self-integrity — receiptSha256 is the sha-256 of the canonical serialization (fc-receipt|v1|json-canonical-sorted-keys|sha256). edit any field and the self-hash no longer matches.

honest limits

a receipt confirms that a specific output is the deterministic result of a specific input through a specific tool build. it is not a chain-of-custody record for how the input was acquired, not a trusted timestamp on its own, and not legal advice. it is an engineering reproducibility artifact that supports examiner testimony and counsel review.

tool-bundle authenticity + signing: /provenance
session custody logs + .fc-case verification: /forensics/verify
native portable file formats: /formats

this content is proprietary to FatCousin Labs Inc. — see /aup. fatcousin processes nothing server-side; every hash on this page is computed locally.

this output, from this input, through this build.

build a receipt

tool slug

input file(s)

drop input file(s)

output file

drop output file

parameters (JSON)

what a receipt proves

input binding — the receipt records the sha-256 of each input. re-drop the file(s) and the hashes must match, byte-for-byte.

output binding — the output sha-256 is recorded. a different output, even by one byte, fails the check.

build binding — the tool's bundle sha-256 is matched against the live /tool-bundles/provenance.json registry, the same one verified at /provenance. this ties the output to the exact, signed tool build.

self-integrity — receiptSha256 is the sha-256 of the canonical serialization (fc-receipt|v1|json-canonical-sorted-keys|sha256). edit any field and the self-hash no longer matches.

honest limits

tool-bundle authenticity + signing: /provenance

session custody logs + .fc-case verification: /forensics/verify

native portable file formats: /formats

this content is proprietary to FatCousin Labs Inc. — see /aup. fatcousin processes nothing server-side; every hash on this page is computed locally.