thumb|right|Two Sart men and two Sart boys in the early 20th century Sart was a term used in the history and ethnography of Iran and Central Asia. The term was commonly applied to sedentary Turks and
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 0xdf1ff2de24c9bb455b6e6f1a7ffd9b7eb737fe46d987873324874efe8d478d91. Chain 2 (Bitcoin): anchored in block 953648 (2026-06-14T15:20:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4173fa82-6110-4b22-9058-93cb2e6ded84.json and https://artists.proofprofile.net/proofs/artist/4173fa82-6110-4b22-9058-93cb2e6ded84.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).