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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0207a05969bab4c9e3d18dbebe6c1c83de93324af4b40d16147b30b7773ebaa1. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5b113e5c-5001-4f68-a8d4-bec2507325d6.json and https://artists.proofprofile.net/proofs/artist/5b113e5c-5001-4f68-a8d4-bec2507325d6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Mozart: 5 Divertimentos, K. Anh. 299/439b
Divertimento, K. Anh. 229/439b, No. 1: I. Allegro (Arr. for Violin, Viola and Cello by Claudio Cruz)
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63afd07c3cc6ad08e3f2cc6d600ec58a609d042ba660fdd50241ae8ca9878334. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/BRARP2200094.
Divertimento, K. Anh. 229/439b, No. 4: V. Allegretto (Arr. for Violin, Viola and Cello by Claudio Cruz)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaea696ad80daa3aad9ad252a57207b0739054c976b866c6d6e5e43b72f769b4a. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BRARP2200113.
Divertimento, K. Anh. 229/439b, No. 5: V. Polonaise (Arr. for Violin, Viola and Cello by Claudio Cruz)
Divertimento, K. Anh. 229/439b, No. 4: I. Allegro (Arr. for Violin, Viola and Cello by Claudio Cruz)
Divertimento, K. Anh. 229/439b, No. 3: I. Allegro (Arr. for Violin, Viola and Cello by Claudio Cruz)