{"attestation_date":"2026-05-13","merkle_root":"eaac44f4c9082ee6393ed52c8129e8616a6eb1dac812d4cd8969fbda44061bcd","total_sources":10466,"max_source_id":49066,"signature":"a9dc2973bffa4ee4c5cd506c020eee342b5db31beda875fe47e0828d292180c2","signature_algorithm":"hmac-sha256(date|root|total_sources)","external_publish_url":null,"computed_at":"2026-05-13T05:20:20.022Z","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)"}}