Alasdair Kent is an Australian operatic tenor, principally known for his interpretations of the Italian bel canto of Rossini, and Mozart. In 2016, Richard Bonynge presented him with the Joan Sutherlan
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 0x221be780549c8c086a1a9409a33e0f739b0d53eb33ae16fe522316c93e194895. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/52e6588d-3b52-4117-bcc7-5d9c3b1460db.json and https://artists.proofprofile.net/proofs/artist/52e6588d-3b52-4117-bcc7-5d9c3b1460db.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
L'italiana in Algeri: Atto I. Cavatina. Languir per una bella
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 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. 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. 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. 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. Recitativo. Qual disdetta è la mia!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbacf0cf20fefb8501ceeca061f74038a8b5238796a0698ae9771b25cb18e988. 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/ES7892300421 — a six-check JSON result.
L'italiana in Algeri: Atto Ii. Cavatina. Oh, come il cor di giubilo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e67cc8c4739f88f40d2782a0b11ab49ae64a2eb4ce6357159aa0a11ac66c24f. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES7892300422 — a six-check JSON result.
L'italiana in Algeri: Atto Ii. Recitativo. Dunque a momenti
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde019ea5ff94970461831e927953b36227eaed21752d69a3e21652fc068ab8e3. 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/ES7892300427 — a six-check JSON result.
L'italiana in Algeri: Atto Ii. Cavatina. Per lui che adoro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6406f933613357b6677e7861a847e7ff8813efc98cfd8592ca1d28f084bd93de. 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/ES7892300428 — a six-check JSON result.
L'italiana in Algeri: Atto Ii. Recitativo. Io non resisto più
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63f444dcce45570cc7b1a6350023380f3c8a5e614fd133e4e1bc5b59af30c231. 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/ES7892300429 — a six-check JSON result.
L'italiana in Algeri: Atto Ii. Quintetto: Ti presento di mia man
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf178bd0795f83b66ba7995dfe5f790c347284c6de4001aa28a3cd03244a53bc1. 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/ES7892300430 — a six-check JSON result.
L'italiana in Algeri: Atto Ii. Recitativo. Orsù: La tua nipote con chi crede
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0144a98504d2853e99e2b768d1401544b713d12e1b40f7b8185e858083a907fb. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/ES7892300434 — a six-check JSON result.
L'italiana in Algeri: Atto Ii. Terzetto. Pappataci! Che mai sento!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92ffdc4143a996410ead4c8c47d53dbc8bc77bfffc528a29415c3368e65b203f. 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/ES7892300435 — a six-check JSON result.
L'italiana in Algeri: Atto Ii. Finale Ii. Dei Pappataci s’avanza il coro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x492cbb1f8cabcf0fae454e2dbbd429e5869815cdbc958f839d908d43887ecc22. 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/ES7892300441 — a six-check JSON result.
L'italiana in Algeri: Atto Ii. Finale Ii. Quartetto: Non sei tu che il grado eletto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f32ca4e6d175042c481ca415acfdf2a665bfd7017d9d4ac67326c8405d266db. 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/ES7892300442 — a six-check JSON result.
L'italiana in Algeri: Atto Ii. Finale Ii. Son l’aure seconde, son placide l’onde
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51bb1efb67cf839a580c6077ec0281f01a4a05188a6acc890fa9333e61720052. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES7892300443 — 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.