Kairo may refer to: Kairo (band), Mexican boy band from 1993 to 1999 with Eduardo Verástegui as member until 1996 Kairo (video game), independently published exploration video game made by Richard
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 0x99f5b3dc8449eae3b988439a82d2dd610902b762f347eb4a3860120877e4b4b8. Chain 2 (Bitcoin): anchored in block 954513 (2026-06-20T06:31:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9dfc2203-99d8-4260-99c5-c4422effa00e.json and https://artists.proofprofile.net/proofs/artist/9dfc2203-99d8-4260-99c5-c4422effa00e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).