Jerzy Michalski (9 April 1924 in Warsaw – 26 February 2007 in Warsaw) was a Polish historian, specializing in the 18th and 19th centuries. He was a professor of the Institute of History at the Polish
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 0xba3746db3a5307835767f432d14af728624cff7f08497cfb1f0edb00df5b6ee8. Chain 2 (Bitcoin): anchored in block 954728 (2026-06-21T18:08:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f867a88c-b082-4621-9df4-29f6e88998ca.json and https://artists.proofprofile.net/proofs/artist/f867a88c-b082-4621-9df4-29f6e88998ca.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).