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 0x5279fd7ca8e37893b6e03a0bdd1a03fa5af42bef4d918de058ff4b80fd8e3fff. Chain 2 (Bitcoin): anchored in block 953903 (2026-06-16T07:05:05Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/14670aa2-ad49-4e26-b615-cfe173b339cf.json and https://artists.proofprofile.net/proofs/artist/14670aa2-ad49-4e26-b615-cfe173b339cf.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Concerto in A minor for 2 Violins and Orchestra, Op. 3 No. 8, RV 522: I. Allegro
Vivaldi: The Four Seasons; Violin Concertos RV. 522, 565, 516
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 0xcd9e458bb7931d07b8ee2d7c815319784667c78c72af0a7816dba9f77d2b1722. 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/USSM19915302.
Concerto in A minor for 2 Violins and Orchestra, Op. 3 No. 8, RV 522: II. Larghetto e spiritoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7e6360929555445c40b19fb58e81515d266c33d7e6e877363317fe4813c623a. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/USSM19915303.
Concerto in A minor for 2 Violins and Orchestra, Op. 3 No. 8, RV 522: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99686afb81327d88cd2460a42adc4eca821b05d67f64dfcd0598dae3dd830360. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/USSM19915304.
Concerto in D minor for 2 Violins, Cello and Orchestra, Op. 3, No. 11, RV 565: I. Allegro II. Adagio e Spiccato - Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39d50bb04d5f9fc6f74ce43ef4a6a3b78031e4449b5b7ce224a9c51d454ccd1d. 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/USSM19915306.
Concerto in D minor for 2 Violins, Cello and Orchestra, Op. 3, No. 11, RV 565: III. Largo e spiccato
St. Petersburg Classic Music Studio Orchestra
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd90de5eb0ceefa04aea8b6526cfe687c9a715fc037c77e7d6588574322731093. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/USSM19915307.
Concerto in D minor for 2 Violins, Cello and Orchestra, Op. 3, No. 11, RV 565: VI. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bdf1fe581af9a6e297e23037f498540e3d14d4425fe9ddaf58785c7759345d1. 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/USSM19915308.
Concerto in G Major for 2 Violins and Orchestra, Op. 21, No. 1, RV 516 (G-Dur/en sol majeur/in sol maggiore): I. Allegro molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5f2ce297ed627463de271b5149b4c3e601e2c6de0d3853104dbd0108084ea99. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/USSM19915310.
Concerto in G Major for 2 Violins and Orchestra, Op. 21, No. 1, RV 516 (G-Dur/en sol majeur/in sol maggiore): II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40db16558f76ccfb4c7a1868421e27655edc289351f9d82165b33c2e861be4d6. 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/USSM19915311.
Concerto in G Major for 2 Violins and Orchestra, Op. 21, No. 1, RV 516 (G-Dur/en sol majeur/in sol maggiore): III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70ffc85173b05c009047e9cc9d001515c1f84a59278db35db84f929f3751e1ea. 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/USSM19915312.