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 0xf42be91eaa7137469c28b069995e864df2efed3a2acb7a37cc93497ca3ebf45e. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8d2e1916-7dc3-4081-94de-94b6ac340389.json and https://artists.proofprofile.net/proofs/artist/8d2e1916-7dc3-4081-94de-94b6ac340389.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
In mia man (After "Casta diva" from Bellini's "Norma")
Maria by Callas (Original Motion Picture Soundtrack)
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 0xeb5f1d9716b881e72cfd9fb281935a11828f1b8a7696cb475b3044f3760a7b80. 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/FR9W11726717 — a six-check JSON result.
10 Pièces de genre, Op. 10: V. Mélodie. Lento ma non troppo, con malinconia
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9649bcd3e02c7d81ee25db5130d61743669479394d206bf2b98b6dad32649d41. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/FR9W11726716 — a six-check JSON result.
Werther, Act III: "Va ! Laisse couler mes larmes" (Arr. for Solo Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6c150fd87dff43ee13c04a215eefa3a16c9c510d9728fbf26de71c631fab670. 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/FR9W11726718 — a six-check JSON result.
La sonnambula, Act II Scene 2: "Ah! non credea mirarti" (Arr. for Solo Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x995501bd9dec455f7e0ad3d325ca9fc238e1c8969c109efb5573233a085ab5f9. 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/FR9W11726719 — a six-check JSON result.
Werther, Act III: "Va ! Laisse couler mes larmes" (Arr. for Solo Piano - Alternative Recorded Version)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cdf126ba05d690cea8d0820e5653eb455ec12644a6505dd270f5706680f4dbe. 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/FRIDO1710675 — a six-check JSON result.