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 0x448bceca0d369db49951c351b0e5f789f884c421d47d8d2734f5f5769e876451. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7ade339a-d07a-4b09-9d6d-155582d35c30.json and https://artists.proofprofile.net/proofs/artist/7ade339a-d07a-4b09-9d6d-155582d35c30.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Divertimento No. 5, Kv 439b (Kv Anhang 229): Menuetto
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 0x767f7abe2db36a3da5e790bd4945e56f1565e6ebd96a1059a261f5bf9a561e05. 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/NLN580512872.
Divertimento In B Flat Major Kv 186: Menuetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76cdd6d1d6172cb1cda1d947806b971cb721c07777c9708023799b590ec3a384. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T20:52:07Z), 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/NLN580512896.
Divertimento No. 5, Kv 439b (Kv Anhang 229): Romance
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02075c69a6d04cb5680737d1a798c32182b2a7403cc169e670788eeb8231fb1c. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/NLN580512874.
Divertimento No. 5, Kv 439b (Kv Anhang 229): Polonaise
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafe3768c3aaa88123fbe90b5fbe3287817b3826dc3ac75d141a3c11565d08235. 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/NLN580512875.
Divertimento No. 6, Kv 439b (Kv Anhang 229): La Ci Darem La Mano (From Don Giovanni)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b92ec3cd08c5826ad5e7d84f060b282d57815dd506e53d14208a2979152d2a2. 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/NLN580512879.
The Art Of The Recorder, PJ Belder Part: 1
Bach Edition Vol. 3, Keyboard Works Vol. I Part: 6
Bach Edition Vol. 3, Keyboard Works Vol. I Part: 3
Bach Edition Vol. 3, Keyboard Works Vol. I Part: 11
Goldberg Variations In G Major BWV 988, Aria With 30 Variations, Goldberg Variationen, G Dur BWV 988, Aria Mit 30 Veränderungen : Aria
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10bb4f5665e19159d7464517d70795ef7118eabbe3c5ee3b335ed7c9bf10c728. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NLN580502934.
Bach Edition Vol. 13, Keyboard Works Vol. II Part: 3
Concerto In F Major, F Dur BWV978, After Antonio Vivaldi: (Allegro)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7289ba7023554907066860b54e14f50578132278ab61da0f72ca12bafb25d39. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NLN580503964.
Concerto In F Major, F Dur BWV978, After Antonio Vivaldi: Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf31b4aa7babd840e985da6c81226e4d1014f1d8627cd9682e468031174fde4fa. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NLN580503965.
Concerto In F Major, F Dur BWV978, After Antonio Vivaldi: Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3523c7929e80e0af4fde69272b3ab0b38537173492f5fddd0d6b307cc7f0a8f4. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NLN580503966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42052f29d2f0fd3b99c70d405bbc3cd462971f4cbeacdebba98c3f8476983285. 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/NLN580529203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x084d2da5c25008519abea00fec1e6d3dc14964320ad30380be25a6213dfd4a30. 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/NLN580529204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb518872f9036490cffa21fba401629b6d8fd0b8ae37e1821961cc5e6ec9b87ed. 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/NLN580529205.
3 Romantic Pieces Op. 75: Allegro Moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1984ca208559f03f417ec9cc167b77f4a66857bc90a9c91d5c38ea27403b13e. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/NLN580529208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x962f8dabb0ccccd089c47225eb46b0a70da1f063f0f8a8a70ad8868d4069c1fb. 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/NLN580529211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a57267eb7bfe9c2222718298d7b07cd5180d7fc3a1e37788a97bac06842ae81. 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/NLN580529212.
Complete Sonatas Vol. V: K188-229 Part: 3
Complete Sonatas Vol. V: K188-229 Part: 1
Complete Sonatas Vol. IV: K140-187 Part: 2
Complete Sonatas Vol. IV: K140-187 Part: 1
Complete Sonatas Vol. II: K49-98 Part: 2
Complete Sonatas Vol. II: K49-98 Part: 1
Bach Edition Vol. 3, Keyboard Works Vol. I Part: 10
Italian Concerto In F Major BWV 971, Italienisches Konzert, F Dur BWV 971: Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4884cf9041749243b95d9a436866ed7ecf354588a3db3cef1d0fdbd62cee618. 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/NLN580502921.
Chromatic Fantasy and Fuge, In D Minor BWV 903, Chromatische Fantasie and Fuge, D Moll BWV 903: Fantasie
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd79036ee581cde3b01197d698c46f7c1881f0bf4b1a15d1f8d0326e6105d384. 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/NLN580502932.
Bach Edition Vol. 16, Chamber Music Part: 13
Bach Edition Vol. 13, Keyboard Works Vol. II Part: 10
Bach Edition Vol. 16, Chamber Music Part: 11
Bach Edition Vol. 13, Keyboard Works Vol. II Part: 12
Bach Edition Vol. 16, Chamber Music Part: 10