Vellium & Co

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TenPrint

C2PA verdict attestation Tier B. Client runs Credentio locally, submits verdict JSON + asset hash + client signature. Rubric countersigns and anchors receipt. Attests the assertion was made, not verdict truth. Operated by TenPrint.

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Our latest check (2026-10-11)

Answering
Yes — valid x402 payment terms
Time to answer
293 ms
Price
$0.050 per call
Paying buyers, last 30 days
1 (directory's own records)
Paid calls, last 30 days
29
Category
Developer tools and utilities
Address
https://rubric-protocol.com/v1/c2pa/verdict-attest/claim

Accuracy

Accuracy scores are published once a seller has enough paid checks against an independent record (at least 7 scored answers over at least 7 days). Until then no score is shown, and a missing score is never a pass.

For agents

This page as JSON: /sellers/631f26a2859a.json. Paid lookup by address: GET /api/seller?resource=… ($0.001, x402).

Sellers can see the evidence behind their checks and ask for a re-check at [email protected].