{"attestation_date":"2026-10-02","merkle_root":"770d3b140a738cc9cd3c922196801162108385d131dcdd0f1e717ad82b0a034d","total_sources":46082,"max_source_id":80433,"signature":"ea28baa32075e0406129d2f822e9c638990737a259311811a091623afc548c92","signature_algorithm":"hmac-sha256(date|root|total_sources)","external_publish_url":null,"computed_at":"2026-10-02T02:01:22.846Z","witnesses":[],"verifyHowto":{"summary":"Rebuild the Merkle tree from /source/:id/receipt.json hashes for id in [1..max_source_id] and compare to merkle_root.","leafOrder":"ascending by source.id, content_hash strings as-is (lowercase hex)","hashFunction":"sha256","interiorNodeFormula":"sha256(left_hex || right_hex)","oddLevelHandling":"duplicate the last leaf (Bitcoin convention)"}}