// self-attested · offline

lab completion record

finished one of the offline curriculum labs? generate a small, portable record that binds which lab you did, the file hashes you reproduced, and a utc timestamp — with a self-hash a third party can check offline. everything is computed on your device; nothing is uploaded.

generate a completion record

pick the lab you finished and drop the golden/output files you reproduced — each is sha-256 hashed locally in your browser. the record is self-attested and stamped with the mandatory not-a-certification disclaimer. nothing is uploaded.

lab

reproduced file(s)

drop the golden/output file(s) you reproduced

self-sign this record (Ed25519, on-device key)unavailable in this browser — the self-hash still protects the record's integrity.

verify a completion record

drop a completion.json below. it is parsed and checked locally — the self-hash, the mandatory disclaimer, and the optional signature. nothing is uploaded.

drop completion.json, or click to choose

what the record binds

the lab — its number, slug, and title, drawn from the open curriculum (the full walkthroughs + published golden hashes live in the repo).
reproduced hashes — the sha-256 of each golden/output file you dropped, hashed locally. these are your attested results; the record does not assert they are the “correct” goldens — compare those yourself against the lab's published table.
a utc timestamp — when the record was generated on your device.
self-integrity — recordSha256 is the sha-256 of the canonical serialization (fc-completion|v1|json-canonical-sorted-keys|sha256). edit any field and the self-hash no longer matches.
optional signature — an Ed25519 self-signature over the self-hash, using the same on-device key as case sessions. it proves integrity + same-device authorship, not authority or identity.

honest limits

a completion record is a learning artifact, not a credential. it confirms that a specific record has not been tampered with and (if signed) came from a specific device key. it does not prove the person did the work themselves, who they are, or that they are competent at anything. it is not a qualification and confers no status.

the labs themselves: /forensics/curriculum
tool-bundle authenticity + signing: /provenance
reproducibility receipts for a single tool run: /forensics/receipts

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

generate a completion record

lab

reproduced file(s)

drop the golden/output file(s) you reproduced

self-sign this record (Ed25519, on-device key)unavailable in this browser — the self-hash still protects the record's integrity.

what the record binds

the lab — its number, slug, and title, drawn from the open curriculum (the full walkthroughs + published golden hashes live in the repo).

reproduced hashes — the sha-256 of each golden/output file you dropped, hashed locally. these are your attested results; the record does not assert they are the “correct” goldens — compare those yourself against the lab's published table.

a utc timestamp — when the record was generated on your device.

self-integrity — recordSha256 is the sha-256 of the canonical serialization (fc-completion|v1|json-canonical-sorted-keys|sha256). edit any field and the self-hash no longer matches.

optional signature — an Ed25519 self-signature over the self-hash, using the same on-device key as case sessions. it proves integrity + same-device authorship, not authority or identity.

honest limits

the labs themselves: /forensics/curriculum

tool-bundle authenticity + signing: /provenance

reproducibility receipts for a single tool run: /forensics/receipts

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