Empas () was a South Korean internet search engine and web portal. Name The service was launched in 1998 by Knowledge Plant Corporation (), which changed its name to Empas Corporation in 2004. The n
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78d945fcc58b66a7bbdcd25e8fad5f789dd90f60fa8dbcd6e30951da9e832703. 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/960c8e3a-2b82-4c61-9a5c-90cb0c2046cd.json and https://artists.proofprofile.net/proofs/artist/960c8e3a-2b82-4c61-9a5c-90cb0c2046cd.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).