thumb|200px|right|Dervish with a lion and a tiger, Mughal painting, thumb|200px|right|Ottoman Dervish portrayed by Amedeo Preziosi, , Muzeul Naţional de Artă al României A dervish, darvesh, or darwī
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 0x2e983ac376a6132c41a67d59a3a69d64fcb630368244579aa4fe2a2663a775e0. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/de0db0c9-b959-43b7-ac3c-fdfe023af877.json and https://artists.proofprofile.net/proofs/artist/de0db0c9-b959-43b7-ac3c-fdfe023af877.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).