Thomas Matthijs Adrianus Cordes (born 30 May 1966) is a retired Dutch cyclist. He competed at the 1988 Summer Olympics in the individual road race and 100 km team time trial and finished in 42nd and 1
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 0xea9a5a486c3ac85642ea70d6fddb709f6ecef2a478c1ee0a71185ea94d5bae27. Chain 2 (Bitcoin): anchored in block 954638 (2026-06-21T03:45:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d415f36e-1fa3-4a9b-b1c8-03933c70ed38.json and https://artists.proofprofile.net/proofs/artist/d415f36e-1fa3-4a9b-b1c8-03933c70ed38.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).