{"attestation_date":"2026-09-28","merkle_root":"5387cf4492ba36884c4c4fbf62d632a954d4ac3004c9fcc71b007cac63b4bacb","total_sources":36879,"max_source_id":70858,"signature":"1ff5ecbcc5874e021219207b3f65ebc708eec3b7515ef2d8239ff3ed7560cc2f","signature_algorithm":"hmac-sha256(date|root|total_sources)","external_publish_url":null,"computed_at":"2026-09-28T02:27:42.232Z","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)"}}