Everyone is focused on building robots.
Somebody has to prove what they did.
Pask is the engagement receipt for the robot age — one signed record per engagement, held where the work happened, verifiable in any browser, offline and years later.
See it live at pask-witness.com
Edit any blue field above.
Every receipt on this page was sealed with real keys on Pask's own reference site, a staged deployment we built and operate. The cryptography is real. The customer, so far, is us.
The key never leaves your building.
The signing key is generated inside a secure chip in the appliance you own. It cannot be exported, so no operator, no cloud, and not Pask ever holds a usable copy. Unplug the appliance and the key goes with you.
One record, from charter to proof.
Every signed record follows the same five stages. Nothing is reconstructed after the fact.
The site signs its charter.
A plain-English founding document: what this site is, who may act on it, and what each device is allowed to do. Everything downstream is derived from it.
Each device joins under contract.
Every robot and sensor is admitted with a signed contract that states what it is and how it speaks. A device that cannot self-attest is represented by a gateway.
A person approves the engagement.
Approval happens once, at the gate, against the charter, by a named party. Never per robot action in the loop. The robots then run exactly as they do today.
The appliance seals one record.
The on-site appliance witnesses the work and seals a single signed record: who did what, when, and under whose approval, committed to a hash on a key you hold.
Anyone verifies it, offline.
The seal recomputes in any browser with no account and no call to us. Change one field of a sealed record and every signature stops verifying.
Beside your robots. Never in the path.
Pask is a witness, not a vault: it watches, it never controls. Your robots keep speaking what they already speak, and you re-route nothing.
Filed with IETF on 2026-07-30 as draft-wilder-scitt-physical-site-engage-receipt-00, an individual submission profiling SCITT for tamper-evident receipts of physical-site engagements, building on IETF RFC 9943 and RFC 9942. The pask-workspace repository holds the current draft, reference implementation, and conformance vectors. This site runs on our own reference deployment.