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 0x4d8e341b3156e004e6a0b4d4863592358bd57fad70ff140f5baa70d58b6c6e83. 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/766ac178-9d8d-40b8-8799-fc921d3b6b60.json and https://artists.proofprofile.net/proofs/artist/766ac178-9d8d-40b8-8799-fc921d3b6b60.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Eugene Onegin (Lyrical scenes in three acts) (Act 1): Introduction
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 0x845494d7eb375264709386d82c750a548c9c19a1043f2f290958279624f03db8. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USSM10404551 — a six-check JSON result.
Eugene Onegin (Lyrical scenes in three acts) (Act 1): Chorus and dance of peasants
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74e0146d48aac49288dc84a05989e6c69b8b282d0979d38b75c86d8cba7d3bf4. 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/USSM10404553 — a six-check JSON result.
Eugene Onegin (Lyrical scenes in three acts) (Act 1): Larina: "Well, my lively one..."
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37aa5e46780cdc6fd676cfc684984edcc1b0a4e279f359ee75a8a314ebdeb5cb. 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/USSM10404555 — a six-check JSON result.
Eugene Onegin (Lyrical scenes in three acts) (Act 1): Quartet; Lensky: "Mesdames! I ventuered..."
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d7d60a2924d666b3eaff658e2711f93b438e92c823f6387bee323346d559873. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/USSM10404556 — a six-check JSON result.
Eugene Onegin (Lyrical scenes in three acts) (Act 1): Tatyana: "How I love to listen..."
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2193fb0d98e6e15b6609610a72e49c3ecbbdc9a7cf2b7db7f47fd7927d4b7f12. 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/USSM10404554 — a six-check JSON result.
Eugene Onegin (Lyrical scenes in three acts) (Act 1): Lensky: "How happy, how happy I am..."
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0fad741f63deb2f1134f61563a28ac9c9b5414104f82d7370f7d9f7332241a8. 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/USSM10404557 — a six-check JSON result.
Eugene Onegin (Lyrical scenes in three acts) (Act 1): Final Scene
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe64bea8b8cd863ef02660368760ea4dcaafeb158c9df9af6573985aaf7099e3c. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/USSM10404558 — a six-check JSON result.
Eugene Onegin (Lyrical scenes in three acts) (Act 1): Introduction; Nurse: "Well, I've talked too much!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a17ef2ac8e08a1b51b34ed6c2f82c6d7c1efd98eaa559c0ed98fafe5c9ee137. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/USSM10404560 — a six-check JSON result.
Eugene Onegin (Act 1, Scene 2, continued): Letter scene
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f092aa940a13036fe64c8f3bbd22e7fc05508c54cd670664bd09b89ab2b4d4b. 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/USSM10404561 — a six-check JSON result.
Eugene Onegin (Act 1, Scene 2, continued): Duet; Tatyana: "Oh, the night has passed..."
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bbc30439a19c186a063ee62ad085c934deef6bdc5e4898ecb6645341acf282b. 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/USSM10404562 — a six-check JSON result.
Eugene Onegin (Act 1, Scene 2, continued): Chorus of serf maidens: Maidens, beauties
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaa03adac5e3f36e4f00a6c052d4a6b353fb50e65f5d86c3733f5a011214fa98. 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/USSM10404564 — a six-check JSON result.
Eugene Onegin (Act 1, Scene 2, continued): Tatyana: He's here...and aria of Onegin: If I should ever wish
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99de92033416f76460d7da15e86edfb17f722d6cc475f8da0df75564bc6f30be. 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/USSM10404565 — a six-check JSON result.
Eugene Onegin, Op. 24, Act II: Entr'acte and Waltz with chorus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0bd8f47503ab1a5b8c403d6ba0d905cebf110a9962a19cb57c452047b781397. 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/USSM10404568 — a six-check JSON result.
Eugene Onegin, Op. 24, Act II: Lensky: "Have I really deserved this..."and Couplets of Triquet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x970a45fcea7281ea9281c1d9001b1e7e3992203e909f049cf4f97963276d399a. 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/USSM10404569 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5c2b94c25c8b7a591879fe09b1f9461f4435e7312086aeaeb17d272f7814609. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM10404570 — a six-check JSON result.
Eugene Onegin, Op. 24, Act II: Final; Lensky: "In your house!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf8ad1c25a5276a2952501ef4f347d63952d69a44a8c6a7d39d37b0be6703074. 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/USSM10404571 — a six-check JSON result.
Eugene Onegin, Op. 24, Act II: Introduction, Zaretsky: "Well, it seems..."
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0d8de583456ff160bc740817de0ba0f7eae7e42c0106217a70a6dcb8bff5327. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/USSM10404573 — a six-check JSON result.