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 0x77a6eed3b9c32cb818b04004135d95faed20eac85895deca52389110caaaa880. Chain 2 (Bitcoin): anchored in block 953842 (2026-06-15T22:22:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f0173b29-6809-4a36-8203-33e8c2dbdf33.json and https://artists.proofprofile.net/proofs/artist/f0173b29-6809-4a36-8203-33e8c2dbdf33.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Piano Trio in A Minor, Op. 50: I. Pezzo elegiaco. Moderato assai – Allegro giusto
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 0xf94f217c804ca9d0e8b6cdaaa7873f5d2ef273d973f9ea7c43a7d981f3e93a64. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/DEB331020202.
Piano Trio in A Minor, Op. 50: IIa. Tema con Variazioni: a. Theme. Andante con moto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3c4cfbff38283a9dab8d2ff489d2a3fd4f98e9dd91e9ee51e02b203c7ff53fe. 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/DEB331020203.
Piano Trio in A Minor, Op. 50: IIa. Tema con Variazioni: b. Var. 1. L'istesso tempo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a162604154741cb34aa3c1521c1f1f176a39d8eb30f274f01dcd5699ad52d51. 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/DEB331020204.
Piano Trio in A Minor, Op. 50: IIa. Tema con Variazioni: c. Var. 2. Più mosso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8711e4d1dde3f5f5699cbb21cfc46e6217c7d96c3dd91be9d4dd4db6fd7e9fa. 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/DEB331020205.
Piano Trio in A Minor, Op. 50: IIa. Tema con Variazioni: g. Var. 6. Tempo di valse
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8324e40805c90f5aa1a468144882f33dc94cd61cfb7324c4a999f6f30d705d85. 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/DEB331020209.
Piano Trio in A Minor, Op. 50: IIa. Tema con Variazioni: j. Var. 9. Andante flebile, ma non tanto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7196c217ae06cbde12b4c72a6cd20b549237f979f48ece3056e785c17041f35b. 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/DEB331020212.
Piano Trio in A Minor, Op. 50: IIa. Tema con Variazioni: k. Var. 10. Tempo di mazurka
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04ce24195409f58c46feac3801b9f78f78b34361e20c8766b3f54f1cc318a0c0. 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/DEB331020213.
Piano Trio in A Minor, Op. 50: IIa. Tema con Variazioni: l. Var. 11. Moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41bbc91726f554d36ee3a00ad36b890dffa7b275d676e3869fdffeb608d16246. 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/DEB331020214.
Piano Trio in A Minor, Op. 50: IIb. Variazione finale e Coda. Allegro risoluto e con fuoco —Andante con moto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17c98441c5144f023f871062c9b073cf0f905256d4eab2b5ee7589e693dc7df4. 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/DEB331020215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x509c86fe930b35fe32ca17a402ff631522b349bfc21d2cc5655e7ba2f70ae1aa. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/DEB331020201.
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
Piano Trio in A Minor, Op. 50: IIa. Tema con Variazioni: d. Var. 3. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c08c14f301ec84c6f6fb6ef45e9768381465c58fbbaa8175cb1d8172e55b47a. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/DEB331020206.
Piano Trio in A Minor, Op. 50: IIa. Tema con Variazioni: e. Var. 4. L'istesso tempo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17f840c84bacef20dc434335d89f5b84a41afc8fb05d776af86f7ca6d1084939. 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/DEB331020207.
Piano Trio in A Minor, Op. 50: IIa. Tema con Variazioni: h. Var. 7. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c848559366538725459a7a25d2919d52900998e8883cadbeacac4948ea0c188. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/DEB331020210.
Piano Trio in A Minor, Op. 50: IIa. Tema con Variazioni: i. Var. 8. Fuga. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d5f60566e7db119bb55a19d7d891b8379505bc7824d9cb533a62c154a3c7c97. 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/DEB331020211.
Trio élégiaque No. 2 in D Minor, Op. 9: I. Moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fe1145f2dedd3a1bfef5de1fa629385069df7e1cfea6c09c1005c62694a9b0b. 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/DEN961502161.