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 0x67d4881b8ce72249d0409322ebd56fa9f11f9c8cb0af1d530810f034bb1c2a8c. Chain 2 (Bitcoin): anchored in block 953616 (2026-06-14T08:58:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/19cfa54d-9984-453d-9558-8ac94277efb4.json and https://artists.proofprofile.net/proofs/artist/19cfa54d-9984-453d-9558-8ac94277efb4.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Symphony No. 9 In D Minor, Op. 125, "Choral": IV. Finale: Presto
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 0xd5604ae7ecf13312685a6bd789b045b766ce3950aed68068e7a702943910c6d9. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199700704 — a six-check JSON result.
Symphony No. 9 In D Minor, Op. 125, "Choral": I. Allegro Ma Non Troppo, Un Poco Maestoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa59f50f485b7383dce80fec6593dec6ed28126843eb4c67186ee0f4375b7546. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199700701 — a six-check JSON result.
Symphony No. 9 In D Minor, Op. 125, "Choral": III. Adagio Molto E Cantabile - Andante Moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43d47b4a0d24739e97d4c5ff108cad8ab4a964a8ade9adfa37b3d1397de6a581. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199700703 — a six-check JSON result.
Symphony No. 9 In D Minor, Op. 125, "Choral": II. Molto Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ef33d45b718c39de912276a6e029ce3c4752aa066c3d0dabdd2de59043788f5. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199700702 — a six-check JSON result.
Symphony No. 9 in D Minor, Op. 125 "Choral": IV. Finale. Presto - Allegro assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c7a8eb44b11404c22ee4fece4f059a9262e54a6039b6c21490b81fb1dc4185a. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192011301 — a six-check JSON result.