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 0x5f8a806beaa383a5d8eed8dd83c58879032debf0e17bb2a4506ac0bdf0ebec0f. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c692bc75-af90-47cc-a8b9-811341dd5019.json and https://artists.proofprofile.net/proofs/artist/c692bc75-af90-47cc-a8b9-811341dd5019.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Bach: Orchestral Suite No.1 in C Major, BWV 1066 - Delalande: Symphonie de Noël (Christmas Symphony) - Purcell: Abdelazer Suite, Z. 570 - Vivaldi: Sinfonia in B Minor, RV 169 - Mozart: Adagio and Fugue in C Minor, K. 546
Mass No. 2 in G major, D. 167: III. Credo
Schubert: Mass No. 2 in G Major, D. 167 - Kyrie in B-Flat Major, D. 45 - Tantum Ergo in C Major, D. 739 - Mass No. 4 in C Major, D. 452
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 0x5b11c1c62021e92cb49ef620ed358591a50fae53d3cab0b451e6bf25ea651cc4. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/CH1408958403.
Mass No. 2 in G major, D. 167: III. Sanctus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c2f4f605e12bc213060efb81eab35cd66494041d5668054cb25e54a8dd01692. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/CH1408958404.
Mass No. 2 in G major, D. 167: VI. Agnus Dei
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fa1b985cc29a5941e9130a8bdbe171383e48a054ea2ef3df5feb776ce596b1b. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/CH1408958406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5aa1e0d8423a9734da5f909c38595e37542e1c94ec788bdf220acc247ba3f59. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/CH1408958401.
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
Mass No. 2 in G major, D. 167: II. Gloria
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a4afe6519405111ec58e253b2d54dd0498d17464bd9c3d2e09c0d0569b4870d. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/CH1408958402.