thumb|Hélène de Montgeroult by Richard Cosway c. 1786 Marquise Hélène de Montgeroult born Hélène Antoinette Marie de Nervo (2 March 1764 – 20 May 1836) was a French composer and pianist. Recognised as
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2b66d37747f5b17baab6db2714c5fd0a5ce74fb4f532fd62a0b194cab5d466d. Chain 2 (Bitcoin): anchored in block 953827 (2026-06-15T19:59:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f8e18d5d-3b44-4fe0-8355-b6fb39ef6e5a.json and https://artists.proofprofile.net/proofs/artist/f8e18d5d-3b44-4fe0-8355-b6fb39ef6e5a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Amadeus et l'Impératrice: Mongeroult - Mozart
Concerto for Fortepiano No. 1 in E-Flat Major (after Viotti): II. Adagio non troppo (Cadenza: Élisabeth Pion)
Amadeus et l'Impératrice: Mozart - Montgeroult
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35c8a0c09f6b5b54bebabc6023e38891d3ec9d607236fb8429ca95ac59627a9b. 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/CAJ722488502.
Concerto for Fortepiano No. 1 in E-Flat Major (after Viotti): I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c51802e9722d0bf3c417bb5c07bb2ceec96f116421b312d4f1a15363f9ffd8c. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/CAJ722488501.
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
Concerto for Fortepiano No. 1 in E-Flat Major (after Viotti): III. Rondo : Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88ac97f05550e38e92e25d73dcd8bc9b44e3af5a51c73532fe0f036761d5f9a1. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/CAJ722488503.