Antonis Kafetzopoulos (; born 13 October 1951) is a Greek actor. He has appeared in more than fifty films since 1980. He has won two Hellenic Film Academy Awards for his roles in the films Plato's Aca
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 0x6a261db762cc7976d822f57ff494816c5957061080814535b465ec5a8d972815. Chain 2 (Bitcoin): anchored in block 953626 (2026-06-14T11:41:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2df5feca-b66a-4e9e-b5e1-e98b59db52a5.json and https://artists.proofprofile.net/proofs/artist/2df5feca-b66a-4e9e-b5e1-e98b59db52a5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).