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 0xf61dcd89ecdb62a82135cf9d00bf74339a16b3da2ad4b9675918d13ea8932a39. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d81a459e-7bf8-42d3-b667-3772c4f20c5e.json and https://artists.proofprofile.net/proofs/artist/d81a459e-7bf8-42d3-b667-3772c4f20c5e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Játékok / Book 1: Twittering - Grand Piano
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 0x2a99629ec37a921156c7c563c783d359d3209605509e30b848ad1ce1af1f7df3. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/DEN962233441.
Trio Sonata No. 1, BWV 525: I. (Allegro moderato) (Transcr. Kurtág) - Grand Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a6bf88e6719b4769d725d3826bbee40aa87bcdbc78d1f47bca44264e2f4f813. 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/DEN962233433.
Twittering (from Játékok / Book 1) - Grand Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a99629ec37a921156c7c563c783d359d3209605509e30b848ad1ce1af1f7df3. 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/DEN962233441.
Trio Sonata No. 1, BWV 525: I. (Allegro moderato) (Transcr. Kurtág) - Upright Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f01b04f0b0f4539ae31188a5931e3cb40775f74438c18ab7c6bf290f321edd9. 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/DEN962233411.
Twittering (from Játékok / Book 1) - Upright Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a71fb5edf61ef4ff7af9f717570d25f40e82b9fd7b612761f38815bf00e85ca. 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/DEN962233419.
Das alte Jahr vergangen ist, BWV 614 (Arr. Kurtág for Piano 4 Hands)
J.S. Bach: Das alte Jahr vergangen ist, BWV 614 (Arr. Kurtág for Piano 4 Hands)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f5cb7710b5e363082bc4c84ac5be4c826c723c06e985ba1e325180dc9c6f22b. 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/DEN962400234.
J.S. Bach: Trio Sonata No. 1, BWV 525: I. (Allegro moderato) (Transcr. Kurtág)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a6bf88e6719b4769d725d3826bbee40aa87bcdbc78d1f47bca44264e2f4f813. 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/DEN962233433.
Gottes Zeit ist die allerbeste Zeit, BWV 106: I. Sonatina (Transcr. for Piano Four Hands by György Kurtàg)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f9be1abc0c969d3dc95c4434487a64cf7c23be285375e359855f423b41acfb4. 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/DEN961830336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f9be1abc0c969d3dc95c4434487a64cf7c23be285375e359855f423b41acfb4. 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/DEN961830336.
Trio Sonata No. 1 in E-Flat Major, BWV 525: I. (Allegro moderato) (Transcr. Kurtág) - Grand Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a6bf88e6719b4769d725d3826bbee40aa87bcdbc78d1f47bca44264e2f4f813. 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/DEN962233433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a6bf88e6719b4769d725d3826bbee40aa87bcdbc78d1f47bca44264e2f4f813. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-21T17:10:31Z), 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/DEN962233433.
Trio Sonata No. 1 in E-Flat Major, BWV 525: I. (Allegro moderato) (Transcr. Kurtág) - Upright Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f01b04f0b0f4539ae31188a5931e3cb40775f74438c18ab7c6bf290f321edd9. 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/DEN962233411.
Játékok / Book 1: Twittering - Upright Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a71fb5edf61ef4ff7af9f717570d25f40e82b9fd7b612761f38815bf00e85ca. 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/DEN962233419.
J.S. Bach: Gottes Zeit ist die allerbeste Zeit, BWV 106: I. Sonatina (Transcr. for Piano Four Hands by György Kurtàg)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f5cb7710b5e363082bc4c84ac5be4c826c723c06e985ba1e325180dc9c6f22b. 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/DEN962400234.
J.S. Bach: Cantata, BWV 12: Weinen, Klagen, Sorgen, Zagen (Arr. Ólafsson for Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f5cb7710b5e363082bc4c84ac5be4c826c723c06e985ba1e325180dc9c6f22b. 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/DEN962400234.
"80 Baroque Duets: Vivaldi, Handel & Bach"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a6bf88e6719b4769d725d3826bbee40aa87bcdbc78d1f47bca44264e2f4f813. 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/DEN962233433.