Hélène Boschi ( ; 11 August 19179 July 1990) was a Franco-Swiss pianist, born in Lausanne. She studied with Yvonne Lefébure and Alfred Cortot at the Ecole normale de musique in Paris. Throughout her l
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 0x2b668d6aff20de11ba1ddcff693b428b3db1aa0107cf91cdea40d2ff332ca9e6. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/72ddf5ae-b90d-4155-9fa6-6f512b281386.json and https://artists.proofprofile.net/proofs/artist/72ddf5ae-b90d-4155-9fa6-6f512b281386.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Bizet: Variations chromatiques - Emmanuel: Sonatine "Bourguignonne" (Mono Version)
Mozart: Concerto pour piano No. 22, K. 482 - Haydn: Symphonie No. 27 (Mono Version)
Mozart: Piano Concerto in E-Flat Major - Haydn: Symphony in G Major