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 0x5a01536ff5404868ff95d3dec7f656a9dc0dc27bb32b9a0e3366953f8e3748f7. Chain 2 (Bitcoin): anchored in block 953988 (2026-06-16T18:23:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2e7ca481-0770-47c1-b642-551933c17689.json and https://artists.proofprofile.net/proofs/artist/2e7ca481-0770-47c1-b642-551933c17689.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Verdi: Luisa Miller - Tragedia Lirica in tre atti di Salvatore Cammarano
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 0xe90e0370943f20683e7f044df6078b3a0e42bab49ec3f33bee6f164cd20679d9. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/GBLGL1015162 — a six-check JSON result.
Giacomo Lauri-Volpi (Recorded 1922 - 1942)
I Puritani: A te, o cara (Recorded 1922)
Orchestra and Chorus of the Metropolitan Opera
Professori d'orchestra del Teatro alla Scala
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf26ce1c3811665f14dba2a689b50e2692583df12c6e2ca3cb7c74c729086ddde. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/GBAJU9300025 — a six-check JSON result.
Tosca: Recondita armonia (Recorded 1922)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13bc07335587e868e950d60c855099c0d4973349fc226a1e95577199cf961762. 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/GBAJU9300028 — a six-check JSON result.
I Puritani: A te, o cara (Recorded 1928)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x230034ba76298e2ad41c9dafbd7946ee987f1c38111876ca9f2253dcb5b6da1f. 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/GBAJU9300034 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16866931fba4d48262c21618a5cf2f3db8ef2fbbadebbf7abfa5436865ba3365. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/GBAJU9300046 — a six-check JSON result.