Jack K. Pleis (May 11, 1917 – December 5, 1990) was an American jazz pianist, arranger, conductor, composer and producer. He recorded on London and Decca Records in the 1950s, and Columbia Records in
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 0x37745675802bb42911681bd0e6ee2d664e25a4077992f10d54016d4bc96612b6. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d2100f09-b8e7-476f-8968-7746b2f334df.json and https://artists.proofprofile.net/proofs/artist/d2100f09-b8e7-476f-8968-7746b2f334df.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).