Cryptographic receipts for delegated AI work

Prove what your AI agents actually did.

Cryptographically verifiable receipts for delegated AI work. The agent signs. The witness signs. The human signs. The verifier runs offline.

See a sample receipt → Read the trust model

Reference implementation · local verifier · patent pending.

Live verifier / receipt artifact

A delegated agent workflow, verified.

Receipt domain Same verifier, different workflow
Receipt condition Select, then verify
select a domain and condition, then verify…

What a receipt can and cannot prove.

Sequesign shows what is verified, what is attested, and what remains only agent-asserted. The distinction is the product.

What the receipt can prove

  • Evidence has not changed after receipt construction
  • Action sequence and chain continuity are intact
  • Agent and witness signatures verify
  • Schema validation passed, when requested
  • Workflow profile validation passed, when requested
  • Human approval signature is present and valid

What a receipt does not prove

  • The agent told the truth
  • The invoice came from the real vendor
  • The payment provider confirmed the instruction
  • The LLM provider attested to the response
  • A lying agent self-reported every unsupported claim
  • Every natural-language claim is externally verified

How the protocol works.

The demo is invoice work. The implementation is general: any agent action, any schema, any workflow profile, any verifiability class.

Agent action
Canonical evidence hash
Chain extension
Agent / witness / human signatures
Offline verification

One protocol. Multiple delegated workflows.

The same sequence-signing receipt pattern can be used across delegated agent workflows. The underlying receipt pattern applies wherever agents act on behalf of people or organizations.

Agent marketplaces

Require receipts before accepting completed delegated work or releasing payment.

Design target

Regulated trading

Record what an agent checked, decided, and executed for later audit review.

Future profile

Healthcare workflows

Separate agent assertions from signed human approvals and external system evidence.

High-trust use case

Contract and claim review

Verify which documents, schemas, approvals, and claims produced an agent output.

Profile candidate

Patent pending.

Sequesign technology is patent pending. This demo explains protocol concepts and is not a production deployment.