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 0xf0b321a21001a5eaea279d76f58864632d288b3f559648e09a86a443f872bdc8. Chain 2 (Bitcoin): anchored in block 954705 (2026-06-21T13:42:37Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ec1413d1-ed87-4b80-aed1-0ced0adeb9d2.json and https://artists.proofprofile.net/proofs/artist/ec1413d1-ed87-4b80-aed1-0ced0adeb9d2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Strauss: Festliches Praludium, TrV 229 - Saegusa: Trumpet Concerto (Live)