{"attestation_date":"2026-09-30","merkle_root":"68c07f2e2273df3139665811f96faff56a4b82a4a3973b68bc07de4cd6e6365c","total_sources":42450,"max_source_id":76549,"signature":"ba47a5bcc937796cdf02f10af3c89fce5b3840b1b36d77403efb3dc9a0ca7294","signature_algorithm":"hmac-sha256(date|root|total_sources)","external_publish_url":null,"computed_at":"2026-09-30T01:57:11.770Z","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)"}}