Pierre Létourneau (born 11 August 1938) is a Canadian singer-songwriter and actor from Quebec. He is known for the songs Maurice Richard and Tous les jours de la semaine. Biography Joseph Pierre Pa
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 0xe3c5338e6ae4b777e9bb0190d2c27a7c9ba7a7f0f62b41f50495f171844f071e. Chain 2 (Bitcoin): anchored in block 954174 (2026-06-18T03:01:36Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7f95b94e-908b-417c-9aac-d3d4080da13e.json and https://artists.proofprofile.net/proofs/artist/7f95b94e-908b-417c-9aac-d3d4080da13e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Échos Vedettes Souvenirs: Pierre Letourneau - Volume 1
Échos Vedettes Souvenirs: Pierre Létourneau, Vol.1
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 0x9f67a30f820aa17fbacc6eb91a4e06ba0026182c6986f58eb8febd8a124422cc. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/CAZ700000360.
Échos Vedettes Souvenirs: Pierre Létourneau, Vol.3
Échos Vedettes Souvenirs: Pierre Létourneau, Vol.2