Michał Matuszewski (born January 6, 1993) is a Polish chess grandmaster. Chess career He achieved his GM norms at the: Polish Team Chess Championships Extraliga in May 2014 Druzynowe Mistrzostwa Pols
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 0xb82e8edf617813a2919ad8d60f14db2387b41937c9ce03f13f697d2e0aff4c2b. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/93fd5bbe-f989-4845-89dc-45adb089d48d.json and https://artists.proofprofile.net/proofs/artist/93fd5bbe-f989-4845-89dc-45adb089d48d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).