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 0xc2409743ec258c4cdf94603235c7a18d5ce7701ce331930cb47d2e9f1cc02ec4. 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/958a8259-928b-446e-9dac-213298b50f6e.json and https://artists.proofprofile.net/proofs/artist/958a8259-928b-446e-9dac-213298b50f6e.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc7da2699770050f58eb5d92002aaba05855e9e76b3273c809a6893ba28ca48c. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/SEYOK1656268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a9e54c3f447cc993bfeb97b7fc608498bb4ac1728ab8c9dd105b6a9779e0c88. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T14:33:35Z), 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/SEYOK1814169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64df525fe3f138527fd4f450591728071dcd11716ca99d9a1c1c4c9c23f4249b. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QM6P42123671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x136b08b94c4913021532b9b4ce0b2e4f3582ddf6cb0f64adedef2d826667906d. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T11:41:16Z), 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/QMDA62110877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedce2b486348d2ab47a82489f66a7b9eeeb34956f9675f2a557b58599ae72f50. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/QMDA72193830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd62b7a6d423b125715a08365e159059a7cf17ae1bedb2c33b6c87101f97e3e46. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T12:01:19Z), 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/QM4TW2294091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5143a157d0fb580b7f1098e13c6f78992322119b570fcedcbd2092285a4256b. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QM6N22475242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85c4cb0980d9947c965ac5ea9a4e2ec9c5a633cd897839d34865c19d32c1996a. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/QMDA62469532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2e6d20c71d082d97d87acef82f054c5ae25e759b1b26c81ffdf33b301ad3f5b. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QMDA62469207.
Gothenburg University School of Music Chamber Choir
Mouyayoum: Vocal Minimalism from Scandinavia
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5089bb0029252530da4744c954d965f60ca57384cea358b0650874934bd0b69. 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/SEBAC9413010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7766d5928a1bb116e62814afa40aabb2fffdd4ed2053957a514043a3c34dfd3d. 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/SEBAC9413020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b8b30b09383b9753d1826d0489bad4478a7a44866c4a6c04113dcab9b9d4448. 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/SEBAC9413030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fef1827174f9a167a77e192d0c2a63b5b448c0319c9d4838cf5929ff72c5383. 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/SEBAC9413040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75576ce67fe4faf95bdd4ee1c930b971068f22f3723ffaa902dfb6558561d469. 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/SEBAC9413050.
Komm, susser Tod, BWV 478 (Arr. K. Nystedt & G. Eriksson)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f8eefdf244873cb4aa98112d4829ab9cd642ae0acd334a893c782a561859c79. 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/SEBAC9413060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a82a1a1fe8e8b122d953fc639a4e86352249288461fc6aeaad472a6e0c7a6b4. 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/SEBAC9413070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2d75ae3bfab2ec87bf2e3e4eaf125632714cd36cf0b17bba7570b419f9ddcac. 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/SEBAC9413080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f60cc53d9f012a7c46eab8e1a3d8bf4a95afc1ee88bfd022c5ce5fe758c7a15. 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/SEBAC9413090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x689242f020518afe52ee9545b922caaede6acb9afad9b103919f0c4cf79573dd. 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/SEBAC9413100.