Leon Bosch is a double bassist known for his expressive bel canto style.http://www.nac-cna.ca/en/news/viewnews.cfm?ID=749&cat=catNACO. He was principal double bass of the Academy of St Martin in the
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 0xf94650103423241c48bfc0cec6a0b221df92cb712c3451f9185e32d3a289ec92. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ed2c5272-180d-4da4-a3bc-98ff44fe5a84.json and https://artists.proofprofile.net/proofs/artist/ed2c5272-180d-4da4-a3bc-98ff44fe5a84.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Bennett: Piano Sextet, Chamber Trio & String Quartet