Óscar Herrero is a Flamenco guitarist from Spain. He was born in Tomelloso (Ciudad Real) on 12 March 1959. Oscar Herrero has authored several flamenco guitar teaching DVDs and didactic textbooks. Amo
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 0xf43946b52bd2d19b49fb6b1d0bb9d50eda6d5bc1b4222b0d3424e08e47ad9c5d. Chain 2 (Bitcoin): anchored in block 954580 (2026-06-20T17:48:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b74743ce-fd11-46f2-84a2-736f3b3b583a.json and https://artists.proofprofile.net/proofs/artist/b74743ce-fd11-46f2-84a2-736f3b3b583a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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