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 0xe6d2b8a9f02db048ed9332dbc7132a998835a0def95b69f339c7115b2336d3a2. 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/4a91df0c-6287-4ec1-9138-195e8883d1b9.json and https://artists.proofprofile.net/proofs/artist/4a91df0c-6287-4ec1-9138-195e8883d1b9.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Concerto for 3 Violins in F Major, RV 551: I. Allegro
Bach, Bologne, Previn, Vivaldi, Williams
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 0x5c433b123a8a98a95eea797b2a37d3b0a0bb01b3886a6ecdd4db88e9f8be752f. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN962302571 — a six-check JSON result.
Concerto for 3 Violins in F Major, RV 551: II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccde14f65cf5de93a7f10a65b620a7de183237bcab0cf8bf423476d1bb1d63cf. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN962302572 — a six-check JSON result.
Concerto for 3 Violins in F Major, RV 551: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa637d40ab4419db6d9fe27b9e0b958dddf967c0286c30de968e47a3365b2445d. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN962302573 — a six-check JSON result.
Violin Concerto No. 1 in A Minor, BWV 1041: I. [Allegro moderato]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57467d0359df532a820e5901ddc2534e0c5636b43f00708ac8176e537f420ead. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN962302581 — a six-check JSON result.
Violin Concerto No. 1 in A Minor, BWV 1041: II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70e81d9661ecb8a9b2ddcbda4d6a5db67cd10c68cb82bbb1d3faa9bde71a9cd2. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/DEN962302582 — a six-check JSON result.
Violin Concerto No. 1 in A Minor, BWV 1041: III. Allegro assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd26e8e7571a249d3ab4fb7090b9f8f779dde9dd10ee3dee8bef0077b238c90e. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN962302583 — a six-check JSON result.
Brandenburg Concerto No. 3 in G Major, BWV 1048: I. [Allegro]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x664578ab52fea69c972748e3b4c56823ea2ec52829d7b51884c5420ef538e711. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN962302601 — a six-check JSON result.
Brandenburg Concerto No. 3 in G Major, BWV 1048: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23d052a547ccf038d119c6000391bff3eedced7e5de40206a3299ba5434568ab. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/DEN962302602 — a six-check JSON result.
Brandenburg Concerto No. 3 in G Major, BWV 1048: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x893267cba86a3c0bb00a94c24de4b1ceca36e5c741a3612ee2db2b455f5685de. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN962302603 — a six-check JSON result.
Violin Concerto No. 2 in A Major, Op. 5: I. Allegro moderato
Joseph Boulogne Chevalier de Saint-Georges
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d2fb5876d4e38756a9ffa7d06d5a91bf0b8bfba3e57c4b91f2dc61423022c6b. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN962302611 — a six-check JSON result.
Violin Concerto No. 2 in A Major, Op. 5: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31f09ca09cd4189d7387305fedd42fe02ec2ad17cc9cdbc2204f8c4e1c71237e. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN962302612 — a six-check JSON result.
Violin Concerto No. 2 in A Major, Op. 5: III. Rondeau
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eebc35d0a1c26b190415acabcaf8574b306b05143c033e5aa1282cd32e6d97c. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN962302613 — a six-check JSON result.
Nice to Be Around - From "Cinderella Liberty" (Version for Solo Violin and String Ensemble)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4586666d303f5113613467ef664183e47711c3d8fb92f30ef17665da683fcc93. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN962302620 — a six-check JSON result.
The Four Seasons / Violin Concerto in G Minor, RV 315 "Summer": III. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf22a585b1f77f4444724e61d72da7ae19431703590ec0a2908f63b746e069bb. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN962302630 — a six-check JSON result.
Theme - From "Schindler's List" (Version for Solo Violin and String Orchestra)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18b1825c23561a96f784b516901b0dd65f77eed22c64a59ce385f546981f0137. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN962302640 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18b1825c23561a96f784b516901b0dd65f77eed22c64a59ce385f546981f0137. 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/DEN962302640 — a six-check JSON result.
Bach, Handel & Vivaldi - Baroque Concerto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23d052a547ccf038d119c6000391bff3eedced7e5de40206a3299ba5434568ab. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN962302602 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccde14f65cf5de93a7f10a65b620a7de183237bcab0cf8bf423476d1bb1d63cf. 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/DEN962302572 — a six-check JSON result.