Sequesign is public.
Today we are publicly launching Sequesign, a protocol for cryptographically verifiable receipts of delegated AI work. The reference implementation, the trust model, and a live demo are available now.
Agents are starting to do real work on behalf of people and organizations. They review invoices, approve refunds, complete marketplace tasks, draft contracts, and make decisions someone else has to live with. When an agent reports what it did, there is currently no portable way to verify that report against the underlying work. The agent wrote the logs. The agent wrote the summary. The agent claimed it followed the steps it was supposed to follow. A Sequesign receipt is the independent record that lets a reviewer cross-check that report against what actually happened.
The site at sequesign.com has a working demo with two agent workflows and five verification scenarios. You can run a valid receipt and watch it pass. You can run a tampered receipt and watch the verifier reject it. You can run a scenario where the agent made a claim it cannot back up, and watch the verifier flag the warning without failing the receipt. That last case is the one we care about most. It shows what a receipt is for, and what it is not.
The technology is patent pending. The reference implementation is public preview, not production. Next on the roadmap are a hosted witness service, a developer SDK, and a delegation manifest primitive that binds the rules to a witnessed commitment at task delegation time, so the rules cannot be authored after the fact to fit the outcome.
If you build agents, evaluate them, regulate them, or have to defend their decisions to someone else, the protocol is designed for you. Try the demo. Read the trust model. Tell us where it falls short.