thumb|Josep Colom, pianist Josep Colom (born 11 January 1947) is a Spanish classical pianist. Biography and career Colom was born in Barcelona, Spain. He began piano lessons in Barcelona with his a
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 0x1607b38567bd6154774bfccbf3601662e48b5e4da3a9ca7cdd946bcaefd1c13f. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6cda0361-2e6d-4673-997d-5cf122180069.json and https://artists.proofprofile.net/proofs/artist/6cda0361-2e6d-4673-997d-5cf122180069.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Moments musicaux (En vivo desde la Fundación Juan March, Madrid, 10/10/2018)
Mozart: Piano Sonatas K. 333, 457, 545 & 576