Claude Vivier ( ; baptised as Claude Roger; 14 April 19487 March 1983) was a Canadian composer, pianist, poet and ethnomusicologist of Québécois origin. After studying with Karlheinz Stockhausen in Co
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 0xb3e02addd5e16ec9615da4dd5493190cf0f19c8a9919354d88f9e1b8b2ada294. Chain 2 (Bitcoin): anchored in block 954717 (2026-06-21T15:47:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f2fd550d-fb6c-4ece-91d2-707ac2d500ae.json and https://artists.proofprofile.net/proofs/artist/f2fd550d-fb6c-4ece-91d2-707ac2d500ae.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Vivier: Lonely Child; Prologue pour un Marco Polo; Bouchara; Zipangu
Vivier: Bouchara / Greeting Music / Wo Bist Du Licht!
Vivier: Wo Bist Du Licht! / Greeting Music / Bouchara / Trois airs pour un opéra imaginaire
Claude Vivier: Orion, Siddhartha & 5 Chansons for Percussion
Journal (Rachid Safir - Ensemble solistes XXI)
Vivier: Chamber Music & Music for Piano Solo
Vivier: Jesus erbarme dich / Journal (Live 2018)
Jesus erbarme dich. for soprano and mixed a cappella choir (Live Recording)
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 0xe07536fb7ca2a0556da4c9731a73ed01b159b80866fe4f9a2247a78b8d2f50c5. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/DERK62464305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef8217f7be24634442d345cac1a0eaaf528026b803a4b7454f588a2d791b54a7. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/US23A1576510.
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