Kain may refer to: Kain (given name) Kain (surname) Kain Department, a department in the Yatenga Province of Burkina Faso Mount Kain, a mountain in the Fraser River Valley of Mount Robson Provincial
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 0x38b7c5ea5bb156ceb1a9dfe5e73abbd82a804f041d427a3b093a81a60d392ebc. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/82122737-0967-48f9-8392-39f3dab2e2da.json and https://artists.proofprofile.net/proofs/artist/82122737-0967-48f9-8392-39f3dab2e2da.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).