Guillaume-Gabriel Nivers (c. 1632, Paris – 13 November 1714) was a French organist, composer and theorist. His first livre d'orgue is the earliest surviving published collection with traditional Frenc
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 0x76b847632fd47cc0fdff5ca706cdc9f4f59a5b084d99fb05b10c79f473fbd2be. Chain 2 (Bitcoin): anchored in block 954549 (2026-06-20T10:56:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a91519ad-20d3-45dd-bca2-02e0d95e1f81.json and https://artists.proofprofile.net/proofs/artist/a91519ad-20d3-45dd-bca2-02e0d95e1f81.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Nivers : Motets pour voix seule & petits chœur
Guillaume-Gabriel Nivers: Motets & Hymnes de l'Eglise
Nivers: Messe, Suites et Motets (orgue J. Boizard à Saint-Michel-en-Thiérache)
Officium defunctorum: Credo quod redemptor meus vivit
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 0x5b52dda9cf7bb95da59acdc3df868f99e3e4e1328347df433a0b40e08766decb. Chain 2 (Bitcoin): anchored in block 958775 (2026-07-19T20:13:58Z), 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/PLB359601703.