Alfred Denis Cortot ( , ; 26 September 187715 June 1962) was a French pianist, conductor, and teacher who was one of the most renowned classical musicians of the 20th century. A pianist of massive rep
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 0x8b99e5a72121820167636580cf82d1e9d1c585f6a71f946e28aa34bb0158f3ea. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/409c069a-1b3b-44aa-b78c-e88465f63e97.json and https://artists.proofprofile.net/proofs/artist/409c069a-1b3b-44aa-b78c-e88465f63e97.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Mendelssohn / Schumann: Trios (Thibaud / Casals / Cortot) (1927-1928)