{"attestation_date":"2026-10-03","merkle_root":"b1e16348e03cd5c5bc28e501bdb33a03b3574f45b3c267f09056a1c55734f50b","total_sources":46102,"max_source_id":80465,"signature":"3d8b734f0cbfefd56f53449b147d8a3c790d665a6fcd8cf632d48105a9e19896","signature_algorithm":"hmac-sha256(date|root|total_sources)","external_publish_url":null,"computed_at":"2026-10-03T00:04:43.343Z","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)"}}