{"attestation_date":"2026-10-13","merkle_root":"9354c70e6ac0b0fc17ad81c95bf707e5d188baad08d2bcee3cd7372e1cb4f5b8","total_sources":46498,"max_source_id":81053,"signature":"439a02a22398139745e6ac3eeac0a3879ba02f634daa1ba94379ee82e2bef3fe","signature_algorithm":"hmac-sha256(date|root|total_sources)","external_publish_url":null,"computed_at":"2026-10-13T01:59:02.011Z","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)"}}