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 0x19e77b016fff46a938cb7a82dd13b438f480fb3ed64470418e4983aa03f21ef2. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a5372077-9d6b-4bb4-a573-af0e6ca1fcd4.json and https://artists.proofprofile.net/proofs/artist/a5372077-9d6b-4bb4-a573-af0e6ca1fcd4.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Vachon, Chevalier de Saint-George, Cambini: Quatuors à corde
Concerto In G Major TWV 40:201, For 4 Violins Without Basso Continuo: 1. Largo e staccato
Telemann: Sinfonia Spirituosa; String Concertos
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 0xcf85b841eff966f1ffb73e98972d4e53694c02e112f62f2a2ee7d421b4d359dd. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/DEN960100291.
Concerto In D Major, TWV 40:202 For 4 Violins Without Basso Continuo: 2. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ab931e320ce9f26593d9893a73d559259b159cf5b9638d4dc3b91f4f99c3034. 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/DEN960100312.
Sonata (Concerto) In C Major TWV 40:203, For 4 Violins Without Basso Continuo: 2. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7467243b56c93e9eb29e047e3cc27e77904ccaae4d1929e635235f748dad1ae. 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/DEN960100272.
Concerto In G Major TWV 40:201, For 4 Violins Without Basso Continuo: 2. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa94a86654342a640b1e704f006ecb1b2371a845eee65831c68dd0fede60d0881. 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/DEN960100292.
Concerto In G Major TWV 40:201, For 4 Violins Without Basso Continuo: 4. Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e03f386d79d37eb566310ea107517432ae3077cf31f6392e60df176d0aced0a. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN960100294.
Concerto In D Major, TWV 40:202 For 4 Violins Without Basso Continuo: 4. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc354b6453f5a1933f381ffed609d07def1d0919297c62e817bfe59b651e3c51f. 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/DEN960100314.
Sonata (Concerto) In C Major TWV 40:203, For 4 Violins Without Basso Continuo: 1. Grave
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfab2ab35816d21ffe4ec5249439f2ef58bacd44109dcfcc803c12748691f4cfb. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/DEN960100271.
Sonata (Concerto) In C Major TWV 40:203, For 4 Violins Without Basso Continuo: 3. Largo e staccato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ed7685b9575e50de9194d4f073f0b2b84ff20eb2ed90cc8bf17d46d2f2fd631. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN960100273.
Sonata (Concerto) In C Major TWV 40:203, For 4 Violins Without Basso Continuo: 4. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fbb5c2a39c9b26b5bdeeb66af59f36c57636528b13fcc753c6f367bd6fbe06c. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/DEN960100274.
Concerto In D Major, TWV 40:202 For 4 Violins Without Basso Continuo: 3. Grave
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc32ad6e65a197e552faced1ffd234874bbd07cca94101d3b51429d315203788f. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN960100313.
Concerto in B-Flat Major for 3 Oboes, 3 Violins and Basso Continuo: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e45bd264494e05b86529c674d31af6c5105a9c7f73a3b0b80ab0dd95940c43e. 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/DEF058602561.
Concerto in B-Flat Major for 3 Oboes, 3 Violins and Basso Continuo: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29379ff7914dc04f4ec94ca1ed2d439d238d5175d3dc076422c7173e0de5ca58. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/DEF058602562.
Concerto in B-Flat Major for 3 Oboes, 3 Violins and Basso Continuo: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28826e1d791beccfd53816c18a4f286d2eb50345f76b6b2555a39e4384c665fe. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/DEF058602563.
Concerto In G Major TWV 40:201, For 4 Violins Without Basso Continuo: 3. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76f245bf4eaf9bdadd1d73fa776de214c36701c652940b3f9a8414a9720829b5. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DEN960100293.
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
Concerto In D Major, TWV 40:202 For 4 Violins Without Basso Continuo: 1. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49c5c3616f17a88c5b3d1931c0b158dc66e189937b23fe90c280ecc1264ae519. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/DEN960100311.