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This quickstart will walk a verifier through validating both the Stamped Mandate’s JWT and its EIP-712 signature for an enhanced-tier request. A is delivered over the API as a PINT (header x-sumvin-pint-token). This is the Enhanced Sigil verification tier — alongside the JWT you also verify the original EIP-712 signature from the X-Pint-Signature and X-Pint-Payload headers.
Enhanced-tier verification is an early-access flow. Partners onboarding now get hands-on with the EIP-712 agent signature shape before it hits mainstream traffic, and help us prioritise verifier tooling — contact your account manager to join the cohort.

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What this page will cover

  • Prerequisites (registered audience, access to EIP-712 verification libraries)
  • Validate the Stamped Mandate’s JWT as in the standard flow
  • Recover and validate the EIP-712 signature against the signer
  • Reconcile the signer identity with the JWT subject