Tufan Derince (born 1987) is a Kurdish folk musician. He is currently based in Rotterdam in the Netherlands. Biografie Tufan Derince was born in 1987 and began playing music at weddings at the age
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d27dfa254ace97d26e57824144ac545449aec0b0f60b7a6487bd9ac1e54abe0. Chain 2 (Bitcoin): anchored in block 953888 (2026-06-16T04:55:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0d9cd402-3e80-4249-b1b9-6c0e23945255.json and https://artists.proofprofile.net/proofs/artist/0d9cd402-3e80-4249-b1b9-6c0e23945255.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).