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Verify

The Verify service accepts a location proof and returns a verified location proof — the original proof, a credibility vector, and a signed EAS attestation. It’s a hosted, verifiable implementation of the evaluation function. This page describes how the service works; the evaluation page describes what is checked and why.

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How It Works

When a location proof is submitted to the verify endpoint:
  1. Plugin resolution — The service identifies which location proof plugins produced each location stamp in the proof and loads the appropriate verification logic.
  2. Stamp verification — Each location stamp is verified independently: signature validation, structural checks, and signal consistency assessment. Verification is plugin-specific — each plugin knows how to check its own evidence.
  3. Cross-correlation (multi-stamp location proofs) — For location proofs with multiple location stamps from independent proof-of-location systems, the service assesses independence and agreement across sources.
  4. Claim assessment — The service evaluates how well the evidence from the location stamps supports the location claim: spatial overlap, temporal overlap, and overall consistency.
  5. Credibility vector generation — The per-stamp results, correlation analysis, and claim assessment are combined into a structured credibility vector with spatial, temporal, validity, and independence dimensions.
All of this happens inside the TEE, which means the evaluation logic is attested and the signing key is protected.

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Two Endpoints

EndpointInputOutputUse case
Verify proofFull location proof (claim + stamps)Verified location proofFull evaluation — the primary verification path
Verify stampSingle location stampStamp validity resultQuick check of a location stamp’s internal validity without a claim
The stamp endpoint is useful for confirming that a location stamp’s signatures are valid and its structure is correct — without the overhead of claim assessment and cross-correlation.

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What Each Endpoint Returns

Verify proof returns a verified location proof containing:
  • The original proof — the location claim and location stamps as submitted
  • Credibility vector — structured assessment across spatial, temporal, validity, and independence dimensions, with per-stamp detail
  • Signed EAS attestation — the verification result signed by the TEE key, independently verifiable by any downstream consumer
Verify stamp returns a validity result: whether signatures, structure, and signals pass their checks. A verified location proof is valuable on its own. It doesn’t need to flow into a Compute operation — many applications only need to know “how credible is this location claim?” without asking any further spatial questions.

Next: Compute

Geospatial operations inside the TEE
See also: