Francesc Burrull (October 18, 1934 – August 28, 2021) was a Spanish jazz musician and composer. In 2017, he was awarded the Creu de Sant Jordi. Early life and education Burrull studied at the Superio
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 0x17358c8a90db61ce6ead2e4149f0d5590214a002e8c7916a018896ee6c1405b7. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/95a8fa16-89c1-465c-ab27-4d0fed5e66b9.json and https://artists.proofprofile.net/proofs/artist/95a8fa16-89c1-465c-ab27-4d0fed5e66b9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).