Haku may refer to: People Haku (artist) Haku (surname) Haku (band) Haku (wrestler) (Tonga Fifita, born 1959), Tongan professional wrestler Characters Haku (Naruto), a character in Naruto media H
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 0xa01922cc9b8e0df46999e2bdb2de90a86fd49d6ef8c16f5473923fef1808909a. Chain 2 (Bitcoin): anchored in block 953842 (2026-06-15T22:22:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0084862a-aeb2-4c5b-8b12-0d56b8ada292.json and https://artists.proofprofile.net/proofs/artist/0084862a-aeb2-4c5b-8b12-0d56b8ada292.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).