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 0xf959d5dee81334d69403e278fbf4a4ab957c52091ca9bb3e8fb98b0721a3fcaf. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cff3c786-38f9-4ed2-bd10-ea51b675b794.json and https://artists.proofprofile.net/proofs/artist/cff3c786-38f9-4ed2-bd10-ea51b675b794.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
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 0x61a493eab4f64b6c231d63cf1412d000d1ee1d305a8cefbf54c084a22b7a82c8. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/ES7892300401 — a six-check JSON result.
L'italiana in Algeri: Atto I. Introduzione. Serenate il mesto ciglio
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. Cavatina. Languir per una bella
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4bc9ac252fda247806488864d9c904265744a8baac96aba0ab95439916befce. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/ES7892300404 — a six-check JSON result.
L'italiana in Algeri: Atto I. Recitativo. Ah, quando fia ch’io possa
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8c6dd946418bb4e77a34e09f19db6d13d070ccf71a11ff4a7fc0fd23cb9a74d. 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/ES7892300405 — a six-check JSON result.
L'italiana in Algeri: Atto I. Duetto. Se inclinassi a prender moglie
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4ecb9f03f9e9c80fe6b06324973e2513f9859b666db14820440a49570bcbc0a. 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/ES7892300406 — 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. Cavatina. Cruda sorte!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3e64b512ef8d4fbfdc700e4d04ed6fbb44dd12627574484c85a58ebb10c9d69. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/ES7892300408 — 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. Ah! Isabella
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e1c5ce81d4983499ef644b6586e6b9a4c05b83bf1522f5bd3a8333773179d14. 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/ES7892300410 — a six-check JSON result.
L'italiana in Algeri: Atto I. Duetto. Ai capricci della sorte
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa601a3f0c393b1eb5daa9de040da9553a6e169932fa33abce82dd263700213b8. 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/ES7892300411 — 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. Aria. Già d’insolito ardore nel petto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x875c2cec536ee47de578c2e1402e702d3b57394f53bd7dcc1a4ac218a0c5c4f0. 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/ES7892300413 — a six-check JSON result.
L'italiana in Algeri: Atto I. Recitativo. Vi dico il ver
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe09c032c34a0119b1d750c16e541b8be575820bc4d5064d3016b2d7737aa61a4. 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/ES7892300414 — 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. Duettino: Oh! Que muso, que figura!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4391207d4d9d5ad574cc24278c4373ebaa30ef0d4254587249c58110e23608e. 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/ES7892300416 — 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.