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 0x82f65749b08af0f3671daf4067958aa703a7499e6fb40f430095b36f7981d270. Chain 2 (Bitcoin): anchored in block 953791 (2026-06-15T13:40:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/da839ef5-bc35-40ef-bae4-c89887dc462a.json and https://artists.proofprofile.net/proofs/artist/da839ef5-bc35-40ef-bae4-c89887dc462a.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
L'italiana in Algeri: Atto I. Introduzione. Serenate il mesto ciglio
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 0x0db64323c71430202b15ae7f2765fb609c9b2e50f5f49b5d9a945357227d1371. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/ES7892300402 — a six-check JSON result.
L'italiana in Algeri: Atto I. Recitativo. Ritiratevi tutti
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd67e82238b8bca6142b8f728afa0f9be9d581a9d24e7d8b0c537e138eaba7866. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES7892300403 — a six-check JSON result.
L'italiana in Algeri: Atto I. Coro: Quanta roba! Quanti schiavi!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd46c3c78967220f5b2bf16593149b8592734fb142744d4809efb0a23ff3aa214. 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/ES7892300407 — a six-check JSON result.
L'italiana in Algeri: Atto I. Recitativo. Già ci siam. Tanto fa
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8a0e960f9bb30674b2bb67340c328d63b05b78a01baaaa21dd35cf71320794e. 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/ES7892300409 — a six-check JSON result.
L'italiana in Algeri: Atto I. Recitativo. Ascoltami, Italiano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40b73fee6b147e3db557b419f3d9fe436b19880ecd958656dc10bb52b673cb22. 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/ES7892300412 — a six-check JSON result.
L'italiana in Algeri: Atto I. Finale I. Coro: Viva, viva il flagel delle donne
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2eb705d8160ee647fef6077f5e863be17fee11dafea3700a6f18cfc44a0791b8. 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/ES7892300415 — a six-check JSON result.
L'italiana in Algeri: Atto I. Finale I. Quartettino: Vo’ star con mia nipote
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61d1cd09aac1de01937cee6198e264b5723ded2dce5e76c321c114e9607685e0. 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/ES7892300417 — a six-check JSON result.
L'italiana in Algeri: Atto I. Finale I. Settimino & Stretta. Pria di dividerci
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3636f610f31892adc74dcb92d7fb92f6efe63ec0497759f74d28ea0d74798350. 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/ES7892300418 — a six-check JSON result.
L'italiana in Algeri: Atto Ii. Introduzione. Uno stupido, uno stolto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aa97fa73873bf5807132ed32bbf942b52eed752c0d04cf232882c41775ad95c. 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/ES7892300419 — a six-check JSON result.
L'italiana in Algeri: Atto Ii. Recitativo. Amiche, andate a dire all’italiana
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9da8b767c57f03d410ca51db0dfd18237e359667b2ca27dca06c22ded1e6a19f. 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/ES7892300420 — a six-check JSON result.
L'italiana in Algeri: Atto Ii. Aria. Le femmine d’italia
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67b063af74a7b72d1b3d5de25f5f4ef9d5c22fe768e1177f446b21261fdef5df. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES7892300432 — a six-check JSON result.
L'italiana in Algeri: Atto Ii. Finale Ii. Mio Signore
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa9be2c21b1e877fd363364e85095528a25442fa672088c28ceb65abeec2a279. 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/ES7892300444 — a six-check JSON result.
Arsilda, RV 700, Act I Scene 1: Recitativo. Questo, o populi, è il giorno (Cisardo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfce9bef16bd68d706614520b37752afde0923098a93aef34ab813dcab93e11bc. 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/FRZ132424004 — a six-check JSON result.
Arsilda, RV 700, Act I Scene 1: Recitativo. Questa, o fidi è mia sposa (Lisea, Nicandro, Mirinda, Cisardo, Arsilda)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1559f5ea3feacc84fcb85e2afccb320db79c92f3c09c9057b42d0b8d789d4fca. 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/FRZ132424007 — a six-check JSON result.
Arsilda, RV 700, Act I Scene 1: Aria. L'esperto nocchiero (Cisardo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0becba5be83b0df18a0e4c7ae3da1dfda448ebf44c039ca3404c5e725cff72f1. 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/FRZ132424008 — a six-check JSON result.
Arsilda, RV 700, Act I Scene 10: Recitativo. Scoperto il tradimento (Cisardo, Barzane)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d5f4ad14a62e4348ec325e840a807e3918ea133a61d354a9dc60d5fa7f1f545. 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/FRZ132424023 — a six-check JSON result.
Arsilda, RV 700, Act I Scene 12: Recitativo. Dunque il cultor degl'orti (Lisea, Cisardo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3b25a7c1e304c2321096988937cc63bd93ab15bdb32ec42db213fe2937db72e. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/FRZ132424027 — a six-check JSON result.
Arsilda, RV 700, Act I Scene 12: Recitativo. Cisardo, or già che il sacro rito (Lisea, Cisardo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa39424657cc98910e8f01c1928ceeb1e79a7337911e8d2f1b72ebb137cb8708a. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/FRZ132424031 — a six-check JSON result.