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 0xc10bfcc8c4b6281bb4c46467f2cb1bf3dfb86961b03372eaec898d57591f3692. Chain 2 (Bitcoin): anchored in block 953758 (2026-06-15T07:48:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b5f7a19c-537b-480b-8575-160a71ac9b3a.json and https://artists.proofprofile.net/proofs/artist/b5f7a19c-537b-480b-8575-160a71ac9b3a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Candombe, Murga, Ska & Rock Fusion (Vol I)