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 0xcddb76ea0802dc4d95b26d0358cec39fa033644f0b9d2670fef9d7390148ad95. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8b846735-d43d-47fb-9dd7-ad3cb691dee9.json and https://artists.proofprofile.net/proofs/artist/8b846735-d43d-47fb-9dd7-ad3cb691dee9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Chopin, Rachmaninov, Tchaikovsky & Musorgsky Songs: Szymanowski: Masques (Wigmore Hall Live)
Chopin, Rachmaninov, Tchaikovsky & Musorgsky Songs - Szymanowski: Masques (Wigmore Hall Live)
Lucrezia Borgia, Act II Scene 5: Il segreto per esser felici
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 0x48178b18abf8b5da86d6847855f6dba99eed789e2a49d6c6222f0dd0ac0962f0. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLA161413405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c6d19854b4db26db9c769f8ba65f0ead26f3979a7ca60607a57f1165ac60d22. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLA161413410.
Lutosławski: Concerto for Orchestra - Szymanowski: 3 Fragments, Op. 5
Coro Di Voci Bianchi "Guido Monaco" Di Prato
Orchestra del Maggio Musicale Fiorentino
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2027594fc3fa1185c0216ff713b39bb9ee3c08798a2c804330a4e987d2ab488b. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079144126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60ffe11d1bd3ae17146b1825d151e71500d623e57db23e761aeed510aa1a90ed. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079144127.
Gianni Schicchi: "Ai miei cugioni Zita e Simone"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed5638cdf0813e84a17eaab85980e6089b743dd2aa1c9e43d6ce7bf48c167cb6. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079144128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x502fc97f111e10d7984ffe479680893f2a7c55e927ebce2db71c2c9bcbaa7e26. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079144129.
Gianni Schicchi: E non c'è nessun mezzo...
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bc1fd37c23d44dae5cf2b823760d519d2ad140b1fe849c7a0aa2da70caeacc2. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079144130.
Gianni Schicchi: "Quale aspetto sgomento e desolato!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8babfeb9441d1310b90c4dc896a19f627cbe0690755537300ad695b85897291. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079144132.
Gianni Schicchi: "Datemi il testamento!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb563ddc976b161e4dc37a4e69398314061eacacc2db9034ac964ef47338d0a87. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079144134.
Gianni Schicchi: Nessuno sa che Buoso ha reso il fiato?
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8ba73a57b45a2bb51ee4c1cc2a7e67108c936ec36323265d6af1be222babcb6. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079144135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a1738a04c30a64ff74ec48773c71a7a59618b067b010e1678115397e8e6d51f. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079144136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8beed735088b238df5642c67bf2836118d6d97704060dcba36f3a1065794268e. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079144137.
Gianni Schicchi: "Prima un avvertimento!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaca193ec45a2fa9822efbf3627b32d6bb064c7e8d0e7244af040bf79d1f48b8. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079144138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf189f42d5c415586e92fabb1a457ee09109f626328491d4e7081ec9283a77ed3. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079144139.
Gianni Schicchi: "Ladro, ladro, furfante!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07b90014288ad2da4b31e1f4b78fa6c64a800eb353caab600046d607697a7749. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079144140.
L'italiana in Algeri: Cruda sorte! Amor tiranno!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x969d86c323ac2297c045dfb52dff5dd1c8b976c74d3af53a81b26174b5525a32. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199512801.