thumb|Image of Federica Lombardi Federica Lombardi (born 19 April 1989) is an Italian operatic soprano. Biography Born in Cesena, Lombardi studied at the Istituto Musicale Angelo Masini in Forlì, wi
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 0x344b9d051e6461118793328157b6a93320fe92e0ed8acdd7e27fef7ef68a450a. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/65cbced1-18e7-4649-a74b-ea7afdeaa84a.json and https://artists.proofprofile.net/proofs/artist/65cbced1-18e7-4649-a74b-ea7afdeaa84a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Verdi: Otello: Atto Primo: Già nella notte densa
Orchestra dell'Accademia Nazionale di Santa Cecilia
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 0x004f7bb8de40610a6f4d5eca1d58ccbbfabd4d1b91954f1fffb09e764a7b8364. 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/USSM11914472.
Verdi: Otello: Atto Secondo: Se inconscia, contro te, sposo, ho peccato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf132967302a23b83d8cdb9acc5f29c2ce334d5e4c1bbf275d93f0a5644280875. 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/USSM11914481.
Verdi: Otello: Atto Terzo: Dio ti giocondi, o sposo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c47cb422f2e500763a00526e9baf45068668ac134665eb12efaa025f112e8bd. 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/USSM11914492.
Verdi: Otello: Atto Terzo: A terra! Sì, nel livido fango
Coro dell'Accademia Nazionale Di Santa Cecilia
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x889103b8c6b68f5b2c28c9c63262cccb696cb6546a4e84e53a61bba571cc7e9f. 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/USSM11914503.
Verdi: Otello: Atto Quarto: Mia madre aveva una povera ancella
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e29de25885d9dc1f77c889b449e60f60f3347d8bc4c3ec9afe1dac9ebc21469. 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/USSM11914508.
Verdi: Otello: Atto Quarto: Piangea cantando nell'erma landa
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d95301985a15926caa6902d9fd0f86b49f09b4d0ba55a9b285a52e7fc44141a. 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/USSM11914509.
Verdi: Otello: Atto Quarto: Ave Maria, piena di grazia
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8a10c5b704eeecb228d531fe2af059b64c9e35affbc8c546afcbd723cae7a9e. 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/USSM11914510.
Verdi: Otello: Atto Quarto: Diceste questa sera le vostre preci?
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aa34acf951e94f61530d80567a5673661a4508167bfbfdf16d7eb67ed9caeb6. 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/USSM11914512.
Verdi: Otello: Atto Quarto: Aprite! Aprite!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8683b747ad415207caf5be6080bb46ae32bd3fb81fc70008768fd69d6b3465c7. 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/USSM11914513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3957ecee504a92a0dc10f5c8c85afbab4056e28f5e6785ce0fc98dbf5df10ea6. 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/DEN962301750.
La bohème, SC 67: Dunque è proprio finita
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46ed07e66d13092b08ba8bf1f6abba400e97dd6874b87211ade9a2a1d335b886. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN962301760.
Verdi: Otello: Atto Secondo: Dove guardi splendono
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7407f7e5fcd6de34c0dcd594ab407bfff5770eee145368d534e9d746e02f97d. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM11914479.
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
Verdi: Otello: Atto Secondo: D'un uom che geme
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17985589e600bf12cffb6d768abe098b7e0755a13daa312a99f730d3ecd01b98. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/USSM11914480.
Verdi: Otello: Atto Terzo: Esterrefatta fisso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0aecfeef741d2e96a07187a622a76bc4387226aaf0cea50efb8276f6faca44e1. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/USSM11914493.
Verdi: Otello: Atto Terzo: Il Doge ed il Senato salutano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9b34daab9cd0a501d1af7057f9b486104a29b23034b44f7925c18f8c007c8f8. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/USSM11914500.
Verdi: Otello: Atto Terzo: Messere, son lieto di vedervi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30d71da4c2c4b029d4a59efa92a8133592071174007f81887aab0d7f245843c2. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/USSM11914501.
Verdi: Otello: Atto Terzo: Quell'innocente un fremito
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb64ccfef9a7d3e50b7ba0a2b6a1a1f79c02c0502446be99a25fc0654d5c276c4. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/USSM11914504.
Verdi: Otello: Atto Terzo: Fuggite! - Ciel! - Tutti fuggite Otello!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a7a2728eb209e2de058a7c401d449901c517a77c20afbfe708d27641b22b2bd. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM11914505.
Verdi: Otello: Atto Quarto: Era più calmo?
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeda02fd60005413f01fd79d271022230971d799cadbd291fb869248106408ac6. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/USSM11914507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc24501e9831d1fc1982893cef1fdce21af7d6ce4cf1f3b7b536bc32e78c8660. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM11914511.