thumb|Nadine Sierra in 2013 Nadine Sierra (born May 14, 1988) is an American soprano. She is best known for her interpretation of Gilda in Verdi's Rigoletto, and Lucia in Donizetti's Lucia di Lammermo
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 0x073672307edf736c90dac0714cdb1243cfed2de6f6c035e747675a5da170ecce. 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/afc52313-440c-432b-8e9b-397e4358563d.json and https://artists.proofprofile.net/proofs/artist/afc52313-440c-432b-8e9b-397e4358563d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
La traviata / Act 1: È strano! È strano!
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 0xe37f567f49dfdb4c8c87b4528c933e3c19d2266873745fe053d093da06e343f8. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/DEN962031109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x965422339e03ebb8c0bfbf0c3f5cfa2df217bc5e4dd128f905cb529c5e3a3b9e. 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/DEN962031110.
La traviata / Act 1: Follie! Delirio vano è questo!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cb3ff9c7ca0a7560af878a98e316e67edd9766b232c8a53a9d688d88f8fbd29. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/DEN962031115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe045d0fc388b0e9650144c364b3fec01f29e62e96d1304e4d9c12e29ed573592. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/DEN962031111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54b3cbc5c89390ae9d2ae3465e8289d87abcf99691d7aa956d8ce2ac51a9c938. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/DEN962031113.
Lucia di Lammermoor / Act 1: Regnava nel silenzio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb31d1f490c4349a916bf500d9003f5b4cdac1ca619fa56e812f5d46733784ea7. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/DEN962031105.
Lucia di Lammermoor / Act 3: Ardon gl’incensi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c8bba85d1e69530107e1d94d6ead4017b57de55e35d6062d132b67b8c52f819. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/DEN962031118.
Lucia di Lammermoor / Act 3: Spargi d'amaro pianto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86e5fb83f7b83760af3200d7c423b0622c1907b93d692d79d3946205f2f472ae. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/DEN962031108.
Roméo et Juliette, CG 9 / Act 1: Ah, je veux vivre
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf56a026baddbd85282a4b217233e0fd73d4258bb191c1ba8e77ce658eaff163f. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/DEN962031101.
Roméo et Juliette, CG 9 / Act 4: Dieu! Quel frisson court dans mes veines?
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ccc292374ba3bc8a5ffdd43b4dd76a1dc9387b9699901e63b8e57b7f7eab619. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/DEN962031102.
Roméo et Juliette, CG 9 / Act 4: Amour, ranime mon courage
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50b7e3ffec4098f2298678a1f2368698b6dc1585982b7ec730add6b747c7936b. 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/DEN962031103.
La traviata, Act I: Dunque a te, un brindisi! (Live)
Orchestra del Maggio Musicale Fiorentino
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b24590c82bd84c98f7fa4df2b023b553d63c176cb6b7a620f38a0e19fc74670. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/ITN322220660.
La traviata, Act I: Un dì, felice, eterea (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x531c92c213076321437533f32c476f657f6efb7a3413f93f5c49ef080eb0dc23. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/ITN322220662.
La traviata, Act II: Annina, donde vieni? (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c1385fd4eb11944569c307a2d35f90e6c5d1af729d66fd27af0d7a5b16320f9. 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/ITN322220669.
La traviata, Act II: Avrem lieta di maschere la notte (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3565522f751df1933e80d52f0ce04b11c213073f1e84a1684b4bd51947ae39d1. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/ITN322220680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b9b5c203874c19217dd7fd6ae4910ee07e81188cfc70f421da67eb774b9db73. 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/ITN322220685.
La traviata, Act III: Largo al quadrupede (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x745263ad81bd866aaf480e6d7a4a4c60743e1b773e74ed3d82cfe48bf9da5e53. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/ITN322220688.
La traviata, Act III: Parigi, o cara, noi lasceremo (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a4b761ea54d70b7e3066a4c60ee440cd93e993cc3d8e6a14c3fbe7394e872d1. 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/ITN322220689.
La traviata, Act III: Ah, Violetta! (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8550b0a4e7afa54ee431143fb405f9e9dd6cdaac5d24e5f0dd3eb0d0af536686. 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/ITN322220692.
Lehár: Der Zarewitsch: Einer wird kommen (Musical Moments)
Puccini: La bohème, SC 67 / Act 1: Sì. Mi chiamano Mimì (Musical Moments)
La bohème, SC 67 / Act 1: Sì. Mi chiamano Mimì
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8abe761ec22658db4a838d79642124a1b6681a1431af1eab73ec411792686f0. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/DEN962201360.
Verdi: La traviata / Act 1: Sempre libera
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe045d0fc388b0e9650144c364b3fec01f29e62e96d1304e4d9c12e29ed573592. 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/DEN962031111.
Puccini: Le Villi, SC 60: Se come voi piccina io fossi (Musical Moments)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4b5a2804dd0154c62aff6f9186059d71e37c51413c3ee92e922c04e59c3b11a. 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/DEN961701610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc96a99e28428d9f737b7c65e6e201c7cf2d0e222fe839fb58457e60f354f654e. 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/DEN961701600.
Floresta do Amazonas, W551: No. 4 Melodia Sentimental
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff653d7626f0f4c088ed585f54cd201fb93ce38632be699e44a1690853148079. 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/DEN961701670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5ca81f95d6fc1c5f14e722d65a78fed8232cb9de45c900e31b09b3be969318c. 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/DEN961701710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65df156581a45e765298c70692a531addac102bf11429590f79f9f4e5f91bd48. 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/USASX1652205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cca438ed03373aeb2f05fcaa9efbac438d109f3f2039be5db14cc45501acece. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/USASX1652210.
Arlen: Over the Rainbow (From "The Wizard of Oz")
Delibes: Lakmé / Flower Duet: Dôme épais le jasmin ... Sous le dôme épais
Lakmé / Flower Duet: Dôme épais le jasmin ... Sous le dôme épais
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96f995780cd139efe53a8589f1fb0b439e21f4c0075176ddaef20b9f938de658. 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/DEN962432309.
Moore: The Ballad of Baby Doe: The Willow Song (Musical Moments)
The Ballad of Baby Doe: The Willow Song - Musical Moments
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd06713465415ecdcc50da34ecbaa10cabf44181f6b5807798a1320be8a2ae72. 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/DEN962301120.
Gounod: Roméo et Juliette, CG 9 / Act 1: Ah, je veux vivre
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf56a026baddbd85282a4b217233e0fd73d4258bb191c1ba8e77ce658eaff163f. 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/DEN962031101.
Foster: Beautiful Dreamer (Arr. Coughlin for Voice and Orchestra) [Musical Moments]
Beautiful Dreamer (Arr. Coughlin for Voice and Orchestra)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46af5ccbf295721e023017d9fbddb9ed1a67d8d9f12fd2e1d585bd87eeadd44c. 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/DEN961701700.
Villa-Lobos: Floresta do Amazonas, W551, 4. Melodia Sentimental
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff653d7626f0f4c088ed585f54cd201fb93ce38632be699e44a1690853148079. 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/DEN961701670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4b5a2804dd0154c62aff6f9186059d71e37c51413c3ee92e922c04e59c3b11a. 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/DEN961701610.