Tatar may refer to: Peoples Tatars, an umbrella term for different Turkic ethnic groups bearing the name "Tatar" Volga Tatars, a people from the Volga-Ural region of western Russia Crimean Tatars,
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 0xc36d9b6cd7607e0bbfe6c3c35fbe1508b36462cc849fce7bd0efbb002983f292. Chain 2 (Bitcoin): anchored in block 954569 (2026-06-20T14:36:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b33fd3d4-908d-4aea-bfcd-b5f18dad7a91.json and https://artists.proofprofile.net/proofs/artist/b33fd3d4-908d-4aea-bfcd-b5f18dad7a91.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).