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 0xfafa0746256d8ff9aa3f7e86b3723fdd817c39d8a9726850c44f636e1452618d. 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/6da61b42-00a0-40b1-b6e7-17c3bca403f1.json and https://artists.proofprofile.net/proofs/artist/6da61b42-00a0-40b1-b6e7-17c3bca403f1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Les Contes d'Hoffmann / Act III: Barcarolle (Arr. for Violin, Cello, Piano and String Ensemble by Aleksandar Sedlar)
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 0x96e52f57dba3eb60efebc5d5bf7ecb28e8231aa814a31699bd62e99a528b38f9. 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/DEN961700610.
Offenbach: Les Contes d'Hoffmann / Act 3, Barcarolle (Arr. For Violin, Cello, Piano And String Ensemble By Aleksandar Sedlar)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96e52f57dba3eb60efebc5d5bf7ecb28e8231aa814a31699bd62e99a528b38f9. 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/DEN961700610.
Concerto for 2 Violins in D Minor, BWV 1043: I. Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddae050f9457b9a001bc2108bd08f37ffc47b2cc1ce3551ea714ab2c99b7ac84. 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/DEN961600211.
Concerto for 2 Violins in D Minor, BWV 1043: II. Largo, ma non tanto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98c154dda32534aca29594f1d8394c3f3c7d2dd54b750c27d2eb4d4693f6029d. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DEN961600212.
Concerto for 2 Violins in D Minor, BWV 1043: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca739915bc4211e1e3cf9d9378d2b3ddf6354606522c60e824cb637c12ddf861. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DEN961600213.
Concerto for Violin, Strings and Basso Continuo in A Minor, BWV 1041: I. (No Tempo Indication)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c9fc241f7f7b942845754d005cec3b79540ed833fcb9053c9ca27dff65474ae. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DEN961600241.
Concerto for Violin, Strings and Basso Continuo in A Minor, BWV 10411: II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e12ff8171aa19e6e1294e680df388237a4ac03b306d558116592c416429fd54. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DEN961600242.
Concerto for Violin, Strings and Basso Continuo in A Minor, BWV 1041: III. Allegro assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0630ee3cd908fd37e40a0af0bd2815e17be9f2ad46e2066cc05ccd7544b6e9cc. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DEN961600243.
Orchestral Suite No. 3 in D Major, BWV 1068: Air
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf23eb6cba601e274752e3870631ee4c4a90a08e4d4c211aba26b1899686d523f. 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/DEN961600250.
Viola Concerto in C Minor: I. Allegro molto ma maestoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7a0ac32c2b67e0a40ce9eda3ce87cd75fa6d6cc44c42cb5795703ea5c644fb7. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DEN961600261.
Viola Concerto in C Minor: II. Adagio molto espressivo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30a3ed542280b9979078049201c4d13733e7005b8ad75ac884142f22cac31e12. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/DEN961600262.
Viola Concerto in C Minor: III. Allegro molto energico
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x305a2a623eef15ebe72ed67601576be8137fb90837c39addf751a68dbe947a19. 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/DEN961600263.
Violin Partita No. 2 in D Minor, BWV 1004: Chaconne
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9eba1ce1808df62375d50810e3956ed35d19a334c8dddc233de906dd75296d25. 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/DEN961600270.
"December" - A Season of Orchestra: Bach
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c9fc241f7f7b942845754d005cec3b79540ed833fcb9053c9ca27dff65474ae. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN961600241.