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 0x01318f86fcbf9d72409b645f36213b1f1ac8bf96ee0514a6ffa75140d2e908ac. Chain 2 (Bitcoin): anchored in block 954549 (2026-06-20T10:56:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a97a771f-6177-485b-b8e6-f1c1f3c1d3d5.json and https://artists.proofprofile.net/proofs/artist/a97a771f-6177-485b-b8e6-f1c1f3c1d3d5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Violin Concerto in C Minor, RV 761 "Amato bene": I. Allegro
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 0x1b8745a67116479797ac5b66520c4cc99d7b3fa1646935dd88c9f5f9c39f29ed. 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/CA68Z1900247.
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. 11 for 2 Violins and Cello in D Minor, Op. 3, RV 565: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6753375f7995578ee577e0cc5eeb0e0359bd6331a0d6e5e62047b650b165663b. 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/FRZ132113200.
L'estro armonico. Concerto No. 11 for 2 Violins and Cello in D Minor, Op. 3, RV 565: II. Adagio e spiccato. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44b6b742b6aa711c8cca87216a4cf5819e1e41f6bcb9dd98c23b5217a7277ad2. 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/FRZ132113210.
L'estro armonico. Concerto No. 12 for Violin in E Major, Op. 3, RV 265: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9f6e21133bc4f1d173839c46402ef7060535b6056fb17670245252620ed42ab. 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/FRZ132113270.
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.
Violin Concerto in C Minor, RV 761 "Amato bene": II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc40603f99375d513c0a8824a7c5181ff5886a77f2a335a178cddebe744647775. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/CA68Z1900248.
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
Violin Concerto in C Minor, RV 761 "Amato bene": III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fe4bdefd2b341727e8a4d17bdf95875f17f95faf35e0374522997904ba9d064. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/CA68Z1900249.
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. 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.