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 0x62cc944bafd58be9fd6066d73d10609efa2ec58669cb674e4f342181a2fbc581. Chain 2 (Bitcoin): anchored in block 953997 (2026-06-16T20:07:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1e23cfc0-966a-4025-acf4-20bf5eb5a524.json and https://artists.proofprofile.net/proofs/artist/1e23cfc0-966a-4025-acf4-20bf5eb5a524.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
The Art Of Beniamino Gigli, Vol. 1 1918-1946
Puccini: Madama Butterfly (Gigli, Dal Monte) (1939)
Vocal Recital: Gigli, Beniamino - Verdi, G. / Massenet, J. / Puccini, G. / Bizet, G. (Complete Collection of Opera Highlights, Vol. 3) (1930-1941)
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 0xad67504b20570b9dfff4805d272a160a0542c9cb96d9947f79d4523d6d35102a. 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/GBLGL0968123 — a six-check JSON result.
Opera Arias (Tenor): Gigli, Beniamino - Cilea, F. / Giordano, U. / Mascagni, P. (Complete Collection of Opera Highlights, Vol. 4) (1941-1951)
Festival of the Great Tenors (1933-1956)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x538103ff7c6622613b9565a36f2bb9c9c499b09a9137690b02e1cb3c78783390. 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/DEAD60800922 — a six-check JSON result.
Tosca: Tosca, Act I: Quo locchio al mondo (Mit deinen Augen)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa971a03161dbdb12ced442848ef812e61df2262d6e9442aac78acc6940d64bc4. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEAD60800923 — a six-check JSON result.
Voi lo sapete, o mamma (Cavalleria rusticana)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa97d29c207e6a2967912d0e5dbc0168d6223c5a39673562c7dabf7925a1c2a0b. 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/GBAYC0802087 — a six-check JSON result.
Bizet: Les Pêcheurs de perles, WD 13, Act 1: No. 4, Romance, "Je crois entendre encore, caché sous les palmiers" (Nadir, Sung in Italian)
Beniamino Gigli/Orchestra/Sir Eugene Goossens
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d58da67005edb3390a21f0328519a97187d6bbf659af1f3fb64352c1dbc1298. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC8805275 — a six-check JSON result.
Gigli Canzonetas 1922 - 1949 (Restauración 2024)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7691398f7d57bf0cc1f64e471bc777e65a07a10a115da703624839712f9c830a. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/ARU8P2400116 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x345e96b3d1a2cea99806b4c4d5e714d0a39c5ea69ca59a69a962410deb859207. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/ARU8P2400117 — a six-check JSON result.
'O sole mio - 23/6/1934 Restauración 2024
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54e1a81037aa9fa5a7dd52b542dca6a201928d7002417f180468bd1c5c06e058. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ARU8P2400118 — a six-check JSON result.
La Serenata - 24/2/1938 Restauración 2024
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8026f85ceee33819465c911cc17354834f10aee471751752b2b2b6499562454b. 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/ARU8P2400119 — a six-check JSON result.
'A Canzone 'e Napule - 1933 - Restauración 2024
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x226400a34db7c70997fe226d7b254623fe40b8516bd8d8f90b2a757e1dbbbaef. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/ARU8P2400120 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91c56134a67481c42ada73284dcae215451ee43ab9e687e7e9c75c1260b5b7ed. 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/ARU8P2400121 — a six-check JSON result.
La Spangnola - 5/6/1939 Restauración 2024
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cc71cc24f197441621e394690749dbeb7f94a814a36176544299cc4e0b18c81. 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/ARU8P2400122 — a six-check JSON result.
Addio bel sogno - 7/4/1934 Restauración 2024
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1798684d65aa715803135c391f646f5af3cb98047a01e3d2fc8e230a94cc446. Chain 2 (Bitcoin): anchored in block 960387 (2026-07-31T10:06:30Z), 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/ARU8P2400123 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bbda0d2de2e7ef2732adf5f9b746c0e12704ff8437033779ada072d8445f8f2. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ARU8P2400124 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf96442bdd453fcfb5aa7739cb87f742410365da9a6b848a50fe49afe16eee839. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ARU8P2400127 — a six-check JSON result.
Solo per te, Lucia (La Canzone dell' Amore) - 7/4/1934 Restauración 2024
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5573e7200af35661543f1a219a98786725e5cb10dfcac67f2a74cba8a2d1682. 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/ARU8P2400129 — a six-check JSON result.
The Gigli Edition, Vol. 11: Milan, Berlin & Rome Recordings
Gigli, Beniamino: Gigli Edition, Vol. 10: Milan and London Recordings (1938-1940)
Puccini, G.: Manon Lescaut (Highlights) [1950]
Opera Arias (Tenor): Gigli, Beniamino (The Very Best of Beniamino Gigli) (1927-1946)
Lucia di Lammermoor: Act III: Tu che a Dio spiegasti l'ali
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x049902bc2fcb28e3ced63adee028ee33b951f0e9d1571f17f1aaa6ce37eb6ba6. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/USB8U1007046 — a six-check JSON result.
Lucia di Lammermoor: Act II: Chi mi frena in tal momento
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f2f45f76c33a3cd67939da257bc52aa519a6af6553fa30540f352cf74e25e8f. 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/USB8U1007047 — a six-check JSON result.
Leoncavallo: Pagliacci, Prologue: "Si può? Si può?" (Tonio)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49523f23705efdd5133abf65a49ca5a05fb5bd13e28fef45cc85030abfcb957d. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9704681 — a six-check JSON result.
Rossini: Il barbiere di Siviglia, Act 1: "Largo al factotum" (Figaro)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x188a19be9185765e73897c39c5dc2d65b9bae380b4ac576f05a51497d073e7bf. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9701681 — a six-check JSON result.
Rossini: Il barbiere di Siviglia, Act 1 Scene 4: No. 8, Duetto, "All'idea di quel metallo" (Figaro, Conte)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f21b7a7782c4d5a9e9a8db87af3566f9c7b69002eb68cb0a858db5a856f6f56. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/GBAYC9701685 — a six-check JSON result.
Donizetti: L'elisir d'amore, Act 1 Scene 2: Cavatina marziale, "Come Paride vezzoso" (Belcore, Adina, Giannetta, Nemorino, Chorus)
Renata Scotto, Carlo Bergonzi, Orchestra del Teatro dell’Opera di Roma & Sir John Barbirolli
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c0892caf70e1169fa4d8efe5568c970cb64e8358208103d8313b065794bc3ad. 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/ITD008900022 — a six-check JSON result.
Verdi: Un ballo in maschera, Act 3 Tableau 1: No. 10, Scena ed Aria, "Alzati! là tuo figlio … Eri tu che macchiavi quell'anima" (Renato)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb557164bbf5440f6ebb2914915bd8571a9b66a0be865be2ff4058d36ed256694. 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/ITD009700567 — a six-check JSON result.
Puccini, G.: Tabarro (Il) (Gobbi, Mas, Prandelli) (1955)
Puccini, Vol. 4: La vie de boheme (Highlights)
The Beniamino Gigli Collection, Vol. 7: Bizet, Massenet & Puccini (2014 Digital Remaster)
The Very Best of Beniamino Gigli (Arie da opere)
Tosca: Act III - "E lucevan le stelle" (Mario Cavaradossi)
Orchestra dei Professori del Teatro alla Scala
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58c309faa3615c17577b4047929724f6a44ee817355dc37dd047121c70fa03e3. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/ITC091200134 — a six-check JSON result.
Rigoletto: Act III - "La donna è mobile" (Il Duca di Mantova)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x474ed322c09b111db6a30106ba03fe1b66ee0128829c7c815695b0fef53166eb. 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/ITC091200136 — a six-check JSON result.
L'arlesiana: Act II - "E' la solita storia (Il lamento di Federico)" (Federico)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x798ee46c922ae196c739f48a1c7546927be6391f97a5d625d953aca5681f30e5. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/ITC091200137 — a six-check JSON result.
I pagliacci: Act I - "Vesti la giubba" (Canio)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77aada3656eff9b70cd74f596510fc1d3c2d1ddf605ec01b9b5b88d3c5bccc9f. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITC091200145 — a six-check JSON result.
A Roma con amore (Music Inspired to Woody Allen's Movie ''To Rome with Love'')
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7e98d2123565b4107ae9cf908cff8a363adb6be9f5bbb47852152d373d59e44. 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/FR6V80258072 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7773113a27ee0bd4feda0a1f0847c2e8c2f2eee7f250000352036096f6cbb84. 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/FR6V80258077 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x026c96b5e5eb467e9537c26c3774c47274bf37b27188328507cc6aebdacbfad6. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/FR6V80546235 — a six-check JSON result.
Toti dal Monte a Tribute, Vol. 1 Arias and Duets by Mozart, Rossini, Bellini and Donizetti (From the collection of Marina Dolfin)