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 0x3ff0c4d3bff59c71184489a1c42410afb0445b539f91af33cad10be13a2608db. Chain 2 (Bitcoin): anchored in block 953648 (2026-06-14T15:20:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3b0b91b6-103c-4380-b40e-861901fa490b.json and https://artists.proofprofile.net/proofs/artist/3b0b91b6-103c-4380-b40e-861901fa490b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0x6bcd2796a89111741cb992ff0b012bc81bba380b357b2d7b25891038c2539580. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/CALVP1924296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc034018538f9f534597732c4b0de2e6a658214b8ff27363eb0b228746f3df80b. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/CALVP1924295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f6ab900e03f061150201f78c71382f33514324a84d68f559d3c0dcd73d15f85. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/CALVP1924297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd686505701c15a18d0dc0bf128096195777f4cf7386a82d57f4dc959d9e6f160. Chain 2 (Bitcoin): anchored in block 957642 (2026-07-12T02:46:48Z), 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/FR10S2238663.
Mozart Piano Sonata No.1 In C, K. 279 - I. Allegro
Mozart Piano Sonata No.1 In C, K. 279 - 2. Andante
Mozart Piano Sonata No.1 In C, K. 279 - 3. Allegro
Mozart Piano Sonata No. 2 In F Major, Kv 280 - 1. Allegro Assai
Mozart Piano Sonata No. 2 In F Major, Kv 280 - 2. Adagio
Mozart Piano Sonata No. 2 In F Major, Kv 280 - 3. Presto
Mozart Piano Sonata No. 3 In B Flat Major, Kv 281 - 1. Allegro
Mozart Piano Sonata No. 3 In B Flat Major, Kv 281 - 2. Andante Amoroso
Mozart Piano Sonata No. 3 In B Flat Major, Kv 281 - 3. Rondeau - Allegro
Mozart Piano Sonata No. 4 In E Flat Major, Kv 282 - 1. Adagio
Mozart Piano Sonata No. 4 In E Flat Major, Kv 282 - 2. Menuetto
Mozart Piano Sonata No. 4 In E Flat Major, Kv 282 - 3, Allegro
Mozart Piano Sonata No. 5 In G Major, Kv 283 - 1. Allegro
Mozart Piano Sonata No. 5 In G Major, Kv 283 - 2. Andante
Mozart Piano Sonata No. 5 In G Major, Kv 283 - 3. Presto
Mozart Piano Sonata No. 6 In D Major, Kv 284 - 1. Allegro
Mozart Piano Sonata No. 6 Kv 284 - 2. Rondeau En Polonaise - Andante
Mozart Piano Sonata No. 6 In D Major, Kv 284 - 3. Tema Con Variazioni
Mozart Piano Sonata No. 7 In C Major, Kv 309 - 1. Allegro Con Spirito
Mozart Piano Sonata No. 7 In C Major, Kv 309 - 2. Andante Un Poco Adagio
Mozart Piano Sonata No. 7 In C Major, Kv 309 - 3. Rondeau - Allegretto Grazioso
Mozart Piano Sonata No. 8 In A Minor, Kv 310 - 1. Allegro Maestoso
Mozart Piano Sonata No. 8 In A Minor, Kv 310 - 2. Andante Cantabile Con Espressione
Mozart Piano Sonata No. 8 In A Minor, Kv 310 - 3. Presto
Mozart Piano Sonata No. 9 In D Major, Kv 311 - 1. Allegro Con Spirito
Mozart Piano Sonata No. 9 In D Major, Kv 311 - 2. Andante Con Espressione
Mozart Piano Sonata No. 9 In D Major, Kv 311 - 3. Rondeau - Allegro
Mozart Piano Sonata No. 10 In C Major, Kv 330 - 1. Allegro Moderato
Mozart Piano Sonata No. 10 In C Major, Kv 330 - 2. Andante Cantabile
Mozart Piano Sonata No. 10 In C Major, Kv 330 - 3. Allegretto
Mozart Piano Sonata No. 11 In A Major, Kv 331 - 1. Andante Grazioso - Tema Con Variazioni
Mozart Piano Sonata No. 11 In A Major, Kv 331 - 2. Menuetto
Mozart Piano Sonata No. 11 In A Major, Kv 331 - 3. Alla Turca - Allegretto
Mozart Piano Sonata No. 12 In F Major, Kv 332 - 1. Allegro
Mozart Piano Sonata No. 12 In F Major, Kv 332 - 2. Adagio
Mozart Piano Sonata No. 12 In F Major, Kv 332 - 3. Allegro Assai
Mozart Piano Sonata No. 13 In B Flat Major, Kv 333 - 1. Allegro
Mozart Piano Sonata No. 13 In B Flat Major, Kv 333 - 2. Andante Cantabile
Mozart Piano Sonata No. 13 In B Flat Major, Kv 333 - 3. Allegretto Grazioso
Mozart Piano Sonata No. 14 In C Minor, Kv 457 - 1. Allegro
Mozart Piano Sonata No. 14 In C Minor, Kv 457 - 2. Adagio
Mozart Piano Sonata No. 14 In C Minor, Kv 457 - 3. Molto Allegro
Mozart Piano Sonata No. 15 In F Major, Kv 494 Plus K 593 - 1. Allegro
Mozart Piano Sonata No. 15 In F Major, Kv 494 Plus K 593 - 2. Andante
Mozart Piano Sonata No. 15 In F Major, Kv 494 Plus K 593 - 3. Rondo - Allegretto
Mozart Piano Sonata No. 16 In C Major, Kv 545 - 1. Allegro
Mozart Piano Sonata No. 16 In C Major, Kv 545 - 2. Andante
Mozart Piano Sonata No. 16 In C Major, Kv 545 - 3. Rondo - Allegretto