{"attestation_date":"2026-10-18","merkle_root":"cf0d518b3934484a7f9d5258aa3f4c85b8d65bdd22d62be4c4298ad07c1ad6ea","total_sources":46516,"max_source_id":81083,"signature":"62159a6a6cd2351fc5a6ff630229c8727b21de3624f3d9b6ab8f481b1e4c13a9","signature_algorithm":"hmac-sha256(date|root|total_sources)","external_publish_url":null,"computed_at":"2026-10-18T02:04:06.162Z","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)"}}