Zail may refer to: Zail (British India), a revenue unit in British India, headed by the zaildar Zail Singh, president of India from 1982 to 1987 Zail or Zeyl, village in Khuzestan, Iran See also Ni
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ccd9ae1379c11be7d3837cd87646ccb23e19f2160aa92a2fe49ec5533a6a597. Chain 2 (Bitcoin): anchored in block 953885 (2026-06-16T04:12:47Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0c0ccc0c-1239-4a58-ab3a-58c20a10dd25.json and https://artists.proofprofile.net/proofs/artist/0c0ccc0c-1239-4a58-ab3a-58c20a10dd25.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).