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 0xcf9e245c3cabd05e8631b1c41ecd509ec78587913f1910f6814d6a3a78ebedbd. Chain 2 (Bitcoin): anchored in block 953827 (2026-06-15T19:59:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f50d7dd5-8b94-4b25-a836-f89e232e7a5d.json and https://artists.proofprofile.net/proofs/artist/f50d7dd5-8b94-4b25-a836-f89e232e7a5d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Pachelbel: Canon and Gigue for Three Violins and Continuo in D Major: Canon
Musica barocca: Baroque Masterpieces by Albinoni, Bach, Handel, Vivaldi...
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 0x7c9b0eb07a4c3201996f904673840579b1417653203e443d6db5b97131a71f0e. 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/DEA800111201.
L'estro armonico. Concerto No. 1 for 4 Violins in D Major, Op. 3, RV 549: I. Allegro
Vivaldi 12 Concertos Op.3 'Estro Armonico', Bach Keyboards Arrangements
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95d53ecfae99aa9a3f066d27620c04ba6c17fddf4744428602bce43c1ccf0453. 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/FRZ132113010.
L'estro armonico. Concerto No. 2 for 2 Violins in G Minor, Op. 3, RV 578: I. Adagio e spiccato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd32bca9daeb7a88a3c4d47b08bb79fe5c9f68e27f989f393c88a346d1e2c52f4. 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/FRZ132113040.
L'estro armonico. Concerto No. 3 for Violin in G Major, Op. 3, RV 310: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x266a8d67448f1acd0b13bd5fb1b53752c5404c807113c77474c2516cc74090f0. 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/FRZ132113090.
L'estro armonico. Concerto No. 3 for Violin in G Major, Op. 3, RV 310: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb70adb9a4f074ab108b488d22f70c30a5482542e75be510c779741279fd57b4. 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/FRZ132113100.
L'estro armonico. Concerto No. 4 for 4 Violins in E Minor, Op. 3, RV 550: II. Allegro assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0bd70745fc2357c6ab2585c432d6547f43eef305bd8e16a82f0d6d38cc4c67e. 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/FRZ132113340.
L'estro armonico. Concerto No. 4 for 4 Violins in E Minor, Op. 3, RV 550: III. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b75f68209a60d5cf72c4e5276370c4e3709093a34252e66fb43c36db68ef61b. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/FRZ132113350.
L'estro armonico. Concerto No. 2 for 2 Violins in G Minor, Op. 3, RV 578: II. [Allegro]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2b262a0deee75b4e59971a3777b0766aa57e0ed6bbad0e34dc5af3ce25a8c0a. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/FRZ132113050.
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
L'estro armonico. Concerto No. 3 for Violin in G Major, Op. 3, RV 310: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7434148c01c9d15ded212863b0c773ee1d7d2c3abc1b6cb81233bb1df8124b8. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/FRZ132113080.
L'estro armonico. Concerto No. 1 for 4 Violins in D Major, Op. 3, RV 549: II. Largo, e spiccato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef26f68992fd29bc1c3471b8c75ec571e9962bb4498fed7b7bafcdb36cbbd7e0. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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/FRZ132113020.
L'estro armonico. Concerto No. 1 for 4 Violins in D Major, Op. 3, RV 549: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ad8d08b2cb1078fa3ee68b70dbf7753aafef4425f684909a56d948c0e821d0f. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ132113030.
L'estro armonico. Concerto No. 2 for 2 Violins in G Minor, Op. 3, RV 578: III. Larghetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62e9410c2334df9998456c6fc69970bc209eaa1f3488be6257914c2f7977d89b. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/FRZ132113060.
L'estro armonico. Concerto No. 2 for 2 Violins in G Minor, Op. 3, RV 578: IV. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c0111fc94d50d27343998d07592b6f6ccde0bd581d0d5d89f05506d8ca21c73. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/FRZ132113070.
L'estro armonico. Concerto No. 10 for 4 Violins in B Minor, Op. 3, RV 580: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x144165d65a7f5a32e5e11cada2b648daf9fa318bc0206a9cb3c493dcf26b7898. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/FRZ132113140.
L'estro armonico. Concerto No. 10 for 4 Violins in B Minor, Op. 3, RV 580: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b1c7f8c5e828709907054f498acb3c083ad3aa943de725b35624f8b8e8958fc. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/FRZ132113150.
L'estro armonico. Concerto No. 10 for 4 Violins in B Minor, Op. 3, RV 580: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a7907cc2b4d90dc533a754dca4383d1af583864b33923c24a95ceca793fcaef. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/FRZ132113160.
L'estro armonico. Concerto No. 11 for 2 Violins and Cello in D Minor, Op. 3, RV 565: IV. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b5ce8b313f4336e8a0069aa217b9916a0faa4f9a20c5b57265387402c851533. 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/FRZ132113230.
L'estro armonico. Concerto No. 4 for 4 Violins in E Minor, Op. 3, RV 550: I. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0315c75f60835fa83bd493dcc4ed2023d388e2f8cf3a1e0ceb1b96603ac5587d. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/FRZ132113330.
L'estro armonico. Concerto No. 4 for 4 Violins in E Minor, Op. 3, RV 550: IV. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27e05dd3f89f0f30d83c07b3b1e70f761f6142f5bcf64f621784a406e42d1eb3. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/FRZ132113360.
L'estro armonico. Concerto No. 5 for 2 Violins in A Major, Op. 3, RV 519: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa72f1bf786dc10341d40e7ec88d84c03e68c12692eb8dbfa70df3d61a43c7ebf. Chain 2 (Bitcoin): anchored in block 960430 (2026-07-31T16:09:41Z), 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/FRZ132113370.