Kostas or Costas () is a Greek given name and surname. As a given name, it can be a hypocorism for Konstantinos (Constantine). Given name Costas Andreou, Greek musician Kostas Antetokounmpo (born 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 0x89bf677fe0360829c6f5769dc6fe8f7837a659ce966e35b71bc4de47ca04bc62. Chain 2 (Bitcoin): anchored in block 954631 (2026-06-21T02:46:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d117d41e-0015-40ae-b67f-f0672551891a.json and https://artists.proofprofile.net/proofs/artist/d117d41e-0015-40ae-b67f-f0672551891a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).