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 0xe9d88b08127c7e285c31dee77b7e4b3b4227961185bff186bdc59daa3fae5fea. Chain 2 (Bitcoin): anchored in block 953947 (2026-06-16T13:14:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/231d1217-ad4b-4fe5-b7a2-f7c263ec9916.json and https://artists.proofprofile.net/proofs/artist/231d1217-ad4b-4fe5-b7a2-f7c263ec9916.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Giuseppe Verdi: La Traviata (Complete Recording)
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
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 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.
Puccini: Les opéras - La discothèque idéale de Diapason, Vol. 10
Madama Butterfly, Act I: Ieri son salita tutta sola (Butterfly, Goro, Il Commissario, Coro, Sharpless, Ufficiale del Registro, Pinkerton)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf332c04d33176e1966d42d0b042b26fbea41a630149d6053ad60cc9c868a44a. 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/GBAYC8600146 — a six-check JSON result.
Madama Butterfly, Act II: Un bel dì vedremo (Butterfly)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b2f1c52d456bad167c4ea28b3b1553a396fa3bf6f77326219e90ad233284843. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC8600153 — a six-check JSON result.
Madama Butterfly, Act II: Humming Chorus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5728ce99764c5989cea4d3e6154d43e9410cf997201cc25b2990ac9a39d23885. 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/GBAYC8600165 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb674b371478cbf87c2fa647c8cc3ca945aff9cf3dd0ce918eee376d38095d2b7. 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/GBAYC9100337 — a six-check JSON result.
Manon Lescaut, Act II: In quelle trine morbide (Manon)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x343f4a880efb1ce7a77d99ef75e488dcd190d340195b84ae4d70f184aaef608e. 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/GBAYC9302388 — a six-check JSON result.
Puccini: Manon Lescaut (Recorded 1952-1956)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1dd74426647a7b7d49ec045520c29037ecfbf4294601a08c13453944b19e88b. 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/ATP130000604 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4831db7285729736599a3606b7896f265a312709ffb17e61f5b2aef75efe096. 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/ATP130000607 — a six-check JSON result.
Puccini, Il Trittico: Il Tabarro - Suor Angelica - Gianni Schicchi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f644a348fecc23b6e58f468af65d30040bed56f7c829865914b286d78e529dc. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/ATP139835428 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc22d0b6bb47777c9c0bded17d4fe6d376a85fb89d858992c42f340632033c8e. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/ATP139835429 — a six-check JSON result.
Puccini: Madama Butterfly (Gigli, Dal Monte) (1939)
Orchestra dell'Accademia Nazionale di Santa Cecilia
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4be4afbb12444f5d3bd1d3b83487a685361beb5af11619897382560b9e920ad5. 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/GBF075940108 — a six-check JSON result.
La Bohème / Act 2: "Quando m'en vo'" (Musetta's Waltz)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7df4bd00f69765f3f7a8c17fae058e48e5ba6d219c968e320f2135df1f67437. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF075940115 — a six-check JSON result.
Gianni Schicchi: No. 11 'O mio babbino caro'
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd161fb68870436d78e39f1c83c52978b238279b2e0c364d38158aa4feec29c17. 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/QM6P41466829 — a six-check JSON result.
Giacomo Puccini - Turandot [1938], Vol. 2
Leoncavallo & Mascagni & Puccini: Great Voices Together - Famous Opera-Ensembles Vol. 2
Giacomo Puccini - Turandot [1938], Vol. 1
Massenet: Manon (Sung in Italian) [Live]