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 0xa88e62d89a9fd6779bece142a4539a8e5f4534d5e57b89ce1f8e45a9cc4442b9. 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/ac8b2d6f-d259-49fa-94c1-d8d7ee6693cc.json and https://artists.proofprofile.net/proofs/artist/ac8b2d6f-d259-49fa-94c1-d8d7ee6693cc.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Württembergische Philharmonie Reutlingen
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 0x0a8fe9a34e1aaa51d440b9b900264231258abccd7a4b062af736c4c73241a602. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/NLY331305296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x166f8d486bd62b89ebd9c1272a5c7e355ef38c6abe53004c08563bfd6a2797c5. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/NLY331305297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x060b9b630fcc00cb2616b94377ea2eb81bec765771178b01ad9501a73ce11e4c. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/NLY331305298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde60f0621a98f7cc2f948baaae46492179cae3f724ff22be40e35404609d7029. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/NLY331305326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dbf576269c80a2ad359269c5469b8f7db9b0ba36c8d3bd2da1d7c7daa662bec. Chain 2 (Bitcoin): anchored in block 960285 (2026-07-30T17:26:40Z), 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/NLY331305327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bfc5361fa169b7ef32e090660cb8afc8d3cef8e423fd6adeeadfc52198759e0. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/NLY331305328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83e768bde4ee3701b3e4d8365092720c589012c9860211ea1afb66bd8c53fb75. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/NLY331305329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c907318d0dc728252a82b679e26437f8b21d395c133eccb2b30d7c17cea99fa. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/NLY331305330.
J.S. Bach: Complete Sacred Cantatas Vol. 10, BWV 181-200
Himmelskönig, sei willkommen, BWV 182: II. Coro. Himmelskönig, sei willkommen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14f9f7abd5319022b502fff8a53a7c2aae492d2e9e6d76b319176000f206dfb1. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/NLY331307674.
Hymne, Drei Geistliche Lieder Und Fuge Op. 96 Für Gemischten Chor, Soli Und Orchester: Hymne: „Lass, O Herr, Mich Hilfe Finden“
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a5300cba59906e2ced400cd4f15454dfb04ee6f68ac83fdb45a44d42caff4aa. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/NLN580550839.
Hymne, Drei Geistliche Lieder Und Fuge Op. 96 Für Gemischten Chor, Soli Und Orchester: Choral: „Deines Kind'S Gebet Erhöre“
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf92d38aa0566613d719b4c58f1256f9f422966e04090f4f7f5f9a9104b2b1a69. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/NLN580550840.
Hymne, Drei Geistliche Lieder Und Fuge Op. 96 Für Gemischten Chor, Soli Und Orchester: Herr, Wir Trau'N Auf Deine Güte
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x583118bcb7ae75ff61a8c0d46448b2a2dc61c39d1fc1b521cfd812d1d97439f5. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/NLN580550841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbed5a1ca2d33759e6d3cde6cf3f10924c967c74e05d2579cc1c4671063aa173b. 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/NLY331408960.
Top 50 Classical Voices (Most Popular Vocal and Choral Works)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e3a4073cb7b7d9ae596afcabfa878357f515465c6583636ad09a94ca5f97886. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/NLY331308760.
Requiem in D Minor, K. 626: III. Dies irae
Südwestdeutsches Kammerorchester Pforzheim
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81e8dfcabecdc208638bc691deb66e907eef120bcf20335d61064c57c2d5a2cc. 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/NLY331411354.
Requiem in D Minor, K. 626: VIII. Lacrimosa
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x143af41e3cdd004c0963a0a0a449ddb41639251291754d5ed4b89b4daca05c8c. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/NLY331411359.
Wolfgang Amadeus Mozart: Schatten ung licht: Chapter 1: Wunder der Natur (1756-1765)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fd0664db01e71764b7d7d355a6d08d929fb6af5f26911c4e56761ab1acacd20. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/DELW71490601.
Wolfgang Amadeus Mozart: Schatten ung licht: Chapter 2: Salzburgs Glanz und Wolfgangs Gloria (1765-1769)
Carl Philipp Emanuel Bach Chamber Orchestra
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ffd144f0024c8fb524119b09ff493b81cebf3614558c5abb8a99dc3ab590847. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DELW71490602.
Wolfgang Amadeus Mozart: Schatten ung licht: Chapter 5: Fort mir dir nach Paris! (1777-1779)
Camerata Academica des Mozarteum Salzburg
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3935e00c9089ac8108e4eac958dd40c5aba4a7debc95cc1fd6207ab6fe28b604. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/DELW71490605.