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 0x3e83c5fc386eb4bb855caf7c3e31449fa06d34c682d4737d00e5882745cd428f. Chain 2 (Bitcoin): anchored in block 953886 (2026-06-16T04:37:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0b3804ae-5c74-4065-bee8-645a3bdc0807.json and https://artists.proofprofile.net/proofs/artist/0b3804ae-5c74-4065-bee8-645a3bdc0807.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
L. de Pablo, T. Marco, J. L. Turina & C. Halffter: Spanish Contemporary Works for Cello Ensemble
French Music: Works by Xenakis, Boulez, Tisné, Thomassin & Looten
Cancíones y Danzas, Vol. 2: Works by Turina, Nin, Morera & Montsalvatge
Cello Octet Conjunto Ibérico, Four Winds, Riley, Pärt, Donatoni, Denisov, Loevendie
Spiritual Spanish music from the XXI century, Halffter, Sanchez-Verdu, De Pablo
Brazil: Works by Heitor Villa-Lobos & Marlos Nobre