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 0x83681e517cfc3d57395334a8d72b44c37c1d6cc7b77b94d4ea7a1ee205481169. 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/ee50ece6-1508-4c5d-9be1-63230f5670ed.json and https://artists.proofprofile.net/proofs/artist/ee50ece6-1508-4c5d-9be1-63230f5670ed.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 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 0x676c72f3f12d7f73ebda3f3412d5278f7b79312bc869e8732dbf3e4a11a5e8d8. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/ARF050400941.
3 Nocturnes for Cello and Guitar: Nocturne No. 1 in A Minor - Andantino
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa025eb1492bd5be078c8cddc89d4e83de8bb684a910594cfa7e85aa318999c2. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/DEB331655501.
Nacht und Träume, Op. 43 No. 2, D. 827 (Arr. for Cello and Guitar by Anja Lechner and Pablo Márquez)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd285f40112771adcdbbcc512893b77145cab78a4bf4e6c24ff1b5efdbd5226ba. 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/DEB331655502.
3 Nocturnes for Cello and Guitar: Nocturne No. 3 in C Major - Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a3089eb5fb2a9678b7975bf246bd042906dfd18c3f80b217fa7377d00792123. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/DEB331655503.
Die Nacht (Arr. for Cello and Guitar by Anja Lechner and Pablo Márquez)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fd726eb981e617722953d91bb0dd92fa3e3f3f278ab1185774d169e34cf0fa8. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/DEB331655504.
Winterreise, D. 911: 24. Der Leiermann (Arr. for Cello and Guitar by Anja Lechner and Pablo Márquez)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e5b52384dd3cd6555b9398d1c2e3cfa65cb127908e6f23f8c93d6c64adfc637. 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/DEB331655505.
Sonata for Arpeggione and Piano in A Minor, D. 821: 1. Allegro moderato (Arr. for Cello and Guitar by Anja Lechner and Pablo Márquez)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf492730e332fa8f8c226a681dfdc5b9cdead53a6b11a0b57ed8d2254f7bdbcab. 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/DEB331655506.
Sonata for Arpeggione and Piano in A Minor, D. 821: 2. Adagio (Arr. for Cello and Guitar by Anja Lechner and Pablo Márquez)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ecb7044b5d782851e082ad528e6a0d23eec6295606c679305491e5c019c3177. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/DEB331655507.
Sonata for Arpeggione and Piano in A Minor, D. 821: 3. Allegretto (Arr. for Cello and Guitar by Anja Lechner and Pablo Márquez)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a66f9b46dbcb11920df513c9606c3022afeb1e6d06e7bc82a5831e0b8c7592f. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/DEB331655508.
Fischerweise, Op. 96 No. 4, D. 881 (Arr. for Cello and Guitar by Anja Lechner and Pablo Márquez)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf4d1dcbdc40762c7026e17cf47b4348d49c0ce4e00102ee18c9943a98909461. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/DEB331655509.
Meeres Stille, Op. 3 No. 2, D. 216 (Arr. for Cello and Guitar by Anja Lechner and Pablo Márquez)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x256e2107586c144392203637a6692b2f9736becd6e9e974ac7e8dbfeec373069. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/DEB331655510.
3 Nocturnes for Cello and Guitar: Nocturne No. 2 in F Major - Adagio cantabile
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86f45e86cb33afe87e6dad150ea7e4c17b51cc34ab4f1364fd6e88c8c3dd7daf. 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/DEB331655511.
Rosamunde, D. 797: 3b. Romanze. Der Vollmond strahlt auf Bergeshöh’n (Arr. for Cello and Guitar by Anja Lechner and Pablo Márquez)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f7600e395238ec4535eb60dfd93e063ce5f1cd1db1a6ffa644a7db1fe408073. 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/DEB331655512.
3 Nocturnes for Cello and Guitar: Nocturne No. 1 in A Minor - Andantino - Var.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40ba87b8bf65b76d66992dc767ad7d542085bd125bdff5dac8f990c081ab0a8f. 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/DEB331655513.
Schubert: Die Nacht (Arr. for Cello and Guitar by Anja Lechner and Pablo Márquez)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fd726eb981e617722953d91bb0dd92fa3e3f3f278ab1185774d169e34cf0fa8. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DEB331655504.
Schubert: Die Nacht, D. deest (Arr. Lechner/Márquez for Cello & Guitar)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fd726eb981e617722953d91bb0dd92fa3e3f3f278ab1185774d169e34cf0fa8. 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/DEB331655504.