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 0x88d2bc24691d958cb5142d52b664c6a07ec1b4bb6ab89c9fd47cd34041e400e8. 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/679f4c81-ed8e-4a33-8e11-67ff6ec03574.json and https://artists.proofprofile.net/proofs/artist/679f4c81-ed8e-4a33-8e11-67ff6ec03574.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Durante, Hammerschmidt & Others: Choral Works
Jesu, meine Freude: Greatest Choral Masterpieces
Sacred Masterpieces Stuttgart Gachinger Kantorei, Stuttgart Bach Collegium, Rilling
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad6fa486f2710266a182d9f6525c483f2fa31e7b5dc078361e4d89aef7b95121. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEAD61820610.
Mozart: Mass No. 11 in C Major, "Credo" / Te Deum Laudamus / Regina Coeli
Klassische Musik in Baden-Württemberg, Vol. 2