thumb|Riccardo Broschi Riccardo Broschi (c. 1698 – 1756) was a composer of baroque music and the brother of the opera singer Carlo Broschi, known as Farinelli. Life Broschi was born in Apulia, Kingd
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 0x97c2df0377938a9f6dc7354c9f2f72412f40f1407bf6192cd7893a7a5490fb17. Chain 2 (Bitcoin): anchored in block 953648 (2026-06-14T15:20:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/46e93565-a8ec-4f34-8fcd-40cc9d8c3c5e.json and https://artists.proofprofile.net/proofs/artist/46e93565-a8ec-4f34-8fcd-40cc9d8c3c5e.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Artaserse, Act III, Scene 1: Aria "Son qual nave ch'agitata" (Arbace)
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 0x044d26105127e8b6d3c27a7aa9b81c5a411f20d50f552d47cbad95acf30c399e. 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/FRZ139320660 — a six-check JSON result.
Artaserse, Act I, Scene 14: Aria "Se al labbro mio non credi" (Arbace) arr. Christophe Rousset
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b4e0269333a54a783ee18b988e49c622b8b966ff1a74e1df8e9137e19d808fd. 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/GBBBA0941330 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf25d638c66f4f4fb941e88d82f8423ce428e5e3c6c082d85ff10b8c0ba3577c. 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/GBF071900620 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe97d12b1ac74bf0dc51cec46f1a99916079072e47c635c0b74c2f26e4a54c2f3. 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/FRZ140201020 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7718ea528fb7625ea9ce51306fd726705b862f281d8402e2444594f148ad24c7. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/GBF071900650 — a six-check JSON result.
Idaspe, Act II Scene 11: Aria "Ombra fedele anch' io" (Dario)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe348b78f304bb2bad8da99aa66670825621ccc18ca82ad23ac85d9fe0ba96afe. 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/FROV61111702 — a six-check JSON result.
Artasere, Act III Scene 1: Aria "Son qual nave ch'agitata" (Arbace)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34adbe23bf1727f2ccf6aad92370ebe24d0493e62caf84f20596bfe8f3497f42. 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/FROV61111701 — a six-check JSON result.
Idaspe: Aria "Qual guerriero in campoarmato"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x373bf94161e3d37eae8038af7ef9f48522d415b15d3927fc9c63d0555997bce4. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/FRZ140201030 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46ddcaa6746345f6e8207f6ab9decc4b3d711cee1ebe67a420fd0931f03dc80b. 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/USSM11003019 — a six-check JSON result.
La musique au temps des castrats - Astrée Recordings
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe71c92936bb72dacbf6c09273bd241e818e2ac07d23d4bf15a9c184f4e8b7f31. 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/FRZ130893100 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x373bf94161e3d37eae8038af7ef9f48522d415b15d3927fc9c63d0555997bce4. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), 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/FRZ140201030 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7de9251596d166fb64ac8f6719dbbc16de9f8288c77990018474a44cc1887a3c. 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/SEAEC2245010 — a six-check JSON result.