Leon Kirchner (January 24, 1919 – September 17, 2009) was an American composer of contemporary classical music. He was a member of the American Academy of Arts and Letters and the American Academy of
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 0xc055a961c2e60cd0fec457101014780f14030b1e5b41103a3ce4948c21eb4517. Chain 2 (Bitcoin): anchored in block 954573 (2026-06-20T15:45:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b4b4e241-29ba-425f-baf4-2a0aab4f0b19.json and https://artists.proofprofile.net/proofs/artist/b4b4e241-29ba-425f-baf4-2a0aab4f0b19.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).