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 0xc3bf169cf63491f5515fc0332df69ae08f33f63f7f684880ad451e8909e11674. Chain 2 (Bitcoin): anchored in block 953626 (2026-06-14T11:41:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/28d844e7-5f79-41a3-b10e-2ff715128bde.json and https://artists.proofprofile.net/proofs/artist/28d844e7-5f79-41a3-b10e-2ff715128bde.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Lucia di Lammermoor: Oh giusto cielo... Il dolce suono (Glass Harmonica, F Major)
Orchestra e Coro del Maggio Musicale Fiorentino
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 0xa02ed9335c4928d35b15f0f90dfc25013db81fa8e5b65a481bba0402b60689e7. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHM82390697 — a six-check JSON result.
Lucia di Lammermoor: Ardon gli incensi (Glass Harmonica, F Major)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3793560c77b1e353f726c6a1be95bdf376fcdc3a510bc7a6957bb5107420b5f. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHM82390698 — a six-check JSON result.
Lucia di Lammermoor: S’avanza Enrico (Glass Harmonica, F Major)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52f51d229aa8600ee8c663595979d9259524457947ef6a4f4b7de943e8cd153c. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHM82390699 — a six-check JSON result.
Lucia di Lammermoor: Spargi d’amaro pianto (Glass Harmonica, F major)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf27dc15b6c6c5990f91ac88e680cdb41a678aa92c73c00278309ae0da08ee765. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHM82390700 — a six-check JSON result.
La Sonnambula: Ah! non giunge uman pensiero
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5641a3abe882cf2fc2f7e49478469ddf29f41f42364743b468ad3cf11ca54eff. Chain 2 (Bitcoin): anchored in block 960407 (2026-07-31T13:26:30Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHM82390712 — a six-check JSON result.
Orchestra del Maggio Musicale Fiorentino
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb54a086a5b9f366686495d22af45949e03b8492f73e84b80584e7329754bb10d. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITN322119889 — a six-check JSON result.
Linda di Chamounix, A. 62, Act I Scene 1: Linda, mia dolce figlia!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5275f3186ba9da7a68ee106bf7370ce870ad39d9d9355422c73534835143a528. Chain 2 (Bitcoin): anchored in block 960277 (2026-07-30T16:10:47Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITN322119891 — a six-check JSON result.
Linda di Chamounix, A. 62, Act I Scene 1: Ambo nati in questa valle
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72d52bc431bc8ab23a0b879e9a705c82758f1a2782f286ddd52176b24d1e75ca. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITN322119892 — a six-check JSON result.
Linda di Chamounix, A. 62, Act I Scene 3: Ah! Tardai troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79781b74b6de3133e73aa38cb9c1d0d285b8e5a11531007f95edba8a700c2a49. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITN322119895 — a six-check JSON result.
Linda di Chamounix, A. 62, Act I Scene 3: Qui sì, pria della partenza
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17b93053356da076a95439dceadc63a374f83782c06667e230d494875ad7a03e. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITN322119897 — a six-check JSON result.
Linda di Chamounix, A. 62, Act I Scene 3: Cari luoghi ov'io passai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f9ab5f9f3e1427890514027901bbf305fa4d4509dce6379934bd35fe7cbc1a5. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITN322119898 — a six-check JSON result.
Linda di Chamounix, A. 62, Act I Scene 3: Per sua madre andò una figlia
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x356fa2dd73c37c17f4df7f7b3f504c9e28de447d2d9366f067d622465f6c5ae4. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITN322119899 — a six-check JSON result.
Donizetti: Il castello di Kenilworth (Live)
Donizetti: Rosmonda d'Inghilterra (Live)
Poème d'amour: No. 3, Ouvre tes yeux bleus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6654b6d5db8023040abe34c416a500f944b53aa44a150b86bd2fef38ad47c553. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GB6CE1600020 — a six-check JSON result.
6 Ariette: No. 5, Per pietà, bell'idol mio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x943fc938390b4b33db590c0aec519055038ceea7398e983cddd69aa8d636fd77. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GB6CE1600029 — a six-check JSON result.
6 Ariette: No. 1, Malinconia, ninfa gentile
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9435f5f7f9ef079e703f6f85e2494ad093ebca20ed49f75ed2d91070197477e7. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GB6CE1600030 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8191658c6944d8314752a91f6c9fad789db33d508c9ccf155d1f6dfde5e74c77. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GB6CE1600031 — a six-check JSON result.
A Guided Tour of the Romantic Era, Vol. 3
Otello, ossia Il moro di Venezia: Act I: Sinfonia
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77fff662298d800f55bb7fff8bbb0cc3d49b0f89e7ca4fc239552cfbccd3b368. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190968501 — a six-check JSON result.
Otello, ossia Il moro di Venezia: Act I: Viva Otello (Choir)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b112e1f22d81be5d27d72f3e2134173015e91486234d56d920699f6186c47c2. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190968502 — a six-check JSON result.
Otello, ossia Il moro di Venezia: Act I: Cavatina: Ah si, per voi gia sento (Otello, Jago, Choir)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55e0dcb6107b4925b1fbb3989f83b35456504cdf3173c3e27c9c11cfef19e49d. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190968504 — a six-check JSON result.
Otello, ossia Il moro di Venezia: Act I: Duet: No, non temer, serena (Jago, Rodrigo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaf9f274cdd657fd981f7589c0ae08efbd2efee3e5db3dbc3fb3d3fb4fb0706a. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190968506 — a six-check JSON result.
Otello, ossia Il moro di Venezia: Act I: Duet: Vorrei, che il tuo pensiero (Desdemona, Emilia)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76e6089a978dd8439b434b0abefc9b9b1f1b056a3212c012b5c44394d8b93d22. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190968508 — a six-check JSON result.
Otello, ossia Il moro di Venezia: Act III: Scene, Air, Duet and Finale III: Ah!… Dagli affanni oppressa (Desdemona, Emilia)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6969c44e7da1aa4798bd2401c51242039adaa7ac3c39414eebf5755f49487a87. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190968611 — a six-check JSON result.
Bel Canto Bully: The musical legacy of the legendary opera impresario Domenico Barbaja