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 0x7cb9dd421b8034b419d995f0aaa7470d6cf33ef571a8cde7161e79f46709f255. Chain 2 (Bitcoin): anchored in block 953949 (2026-06-16T13:28:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/16702185-66fd-474e-b5c6-87a3cc518b6d.json and https://artists.proofprofile.net/proofs/artist/16702185-66fd-474e-b5c6-87a3cc518b6d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).