Kohl may refer to: Kohl (cosmetics), an ancient eye cosmetic Kohl (surname), including a list of people with the surname Kohl's, an American department store retail chain KOHL, a radio station in Fr
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 0x6367bb1d29373c94e5bef0fc0e01b205959e365d8499801d0b98bbcf794d86f5. Chain 2 (Bitcoin): anchored in block 954500 (2026-06-20T04:47:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9a56d9cd-bfbe-4979-a927-c9064cdbbca6.json and https://artists.proofprofile.net/proofs/artist/9a56d9cd-bfbe-4979-a927-c9064cdbbca6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).