KOTRA (Korea Trade Promotion Corporation initially, Korea Trade-Investment Promotion Agency since 1995) is a state-funded trade and investment promotion organization operated by the Government of Sout
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 0x7fe865c158a4845611b54abb486e8bf36a8efec9e5fee9e8d7a162817cd861f7. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5825892c-9b55-48f2-82b4-142e1897d5f8.json and https://artists.proofprofile.net/proofs/artist/5825892c-9b55-48f2-82b4-142e1897d5f8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).