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 0xb446f956180891264142ba6fa2949514fc97959c39390337936f973085dad221. Chain 2 (Bitcoin): anchored in block 953877 (2026-06-16T02:39:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0845a26b-b031-4c28-abd0-6deeb767a180.json and https://artists.proofprofile.net/proofs/artist/0845a26b-b031-4c28-abd0-6deeb767a180.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Maria di Rohan: Act II: Son leggiero, e ver, d'amore (Gondi)
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 0x948af315fa72106210fa1bf69136c2a4fbea1f74b5b0d054834dd979b498507f. 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/USB8U1506424 — a six-check JSON result.
Rossini: Mosè in Egitto (Moses in Egypt) [Live]
Pizzetti: Assassinio nella cattedrale (Murder in the Cathedral)
Vivaldi: Nisi dominus, RV 608 & Magnificat, RV 611 (Mono Version)
Nisi Dominus, RV 608: Cum dederit dilectis suis
Orchestra da camera dell'Angelicum di Milano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a6cea3ffd0f4d3102abdefd8904ed272af57661083c3888fd50dba4790b2a45. Chain 2 (Bitcoin): anchored in block 960276 (2026-07-30T16:01:17Z), 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/FRS181443300 — a six-check JSON result.
Vivaldi: Nisi Dominus & Magnificat (Stereo Version)
Glinka: Zhizn' za tsarya (A Life for the Tsar) (1954)
Verdi: Rigoletto (Bjorling, R. Peters, Merrill) (1956)
Puccini: Manon Lescaut - The Sony Opera House
Puccini: Manon Lescaut (Albanese, Bjorling, Perlea) (1954)
Orchestra e Coro Del Teatro di San Carlo di Napoli
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbcf68ee705447cfe53ff7a299321cd205e66eec113f5f80fd30b1628db94832. 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/US89R0695136 — a six-check JSON result.
Donizetti: Roberto Devereux: Geme!... Pallor funereo...
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bc9e317cab89a796128a5e81e34620c84f0ec641dfcf633f4bccc6a57456df6. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/US89R0695137 — a six-check JSON result.
Donizetti: Roberto Devereux: All'afflitto e dolce pianto...
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2e87a041c9d25a8cd29e679733d6d3474edfd64a05df4ca8f2d56378e1e5641. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/US89R0695138 — a six-check JSON result.
Donizetti: Roberto Devereux: Duchessa... Alle fervide preci...
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69b3ebb64b5fc197fdcda7b15675425e2ce6ab18954cbfeebc788d09ab6e3bae. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/US89R0695139 — a six-check JSON result.
Donizetti: Roberto Devereux: L'amor suo mi fe' beata...
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67585e8a2555a472fe1ed514fe67073ff806c997e3ac707a993b7b4ec2322b00. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/US89R0695140 — a six-check JSON result.
Donizetti: Roberto Devereux: Nunzio son del Parlamento!...
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c68f866060a945bddf0a22e766773ba344c8bb8aa93ba0b1375c74251a692fd. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/US89R0695141 — a six-check JSON result.
Donizetti: Roberto Devereux: Ah! Ritorna qual ti spero....
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb6e20ce6407b052d83e78a6f546ca339e96309af3e9decebad5c51eb37f3f39. 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/US89R0695142 — a six-check JSON result.
Donizetti: Roberto Devereux: Forse in quel cor sensibile...
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fb4bbe1c68f86ba323c1f2f88d2fb2bbe5ea12850658a33aa1cd5ed16e8fcae. 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/US89R0695146 — a six-check JSON result.
Roberto Devereux, IGD 61, Act I: "L'amor suo mi fe' beata" (Elisabetta)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5908e3cc0340e3f3cc00b0566e5f3a3fcd30cf6f50837741cd3efc4d4cf8bcb. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/ITE012108673 — a six-check JSON result.
Antonio Vivaldi, Nisi Dominus, Magnificat
Don Giovanni o sia Il Convitato di Pietra
Requiem, Verdi, Orchestre national de la RTF - Lorin Maazel
Jussi Björling - The Swedish Caruso, Vol. 8