Sachika is a given name. Notable people with the name include: Sachika Misawa (born 1993), Japanese voice actress Sachika Udara (born 1995), Sri Lankan cricketer Category:Japanese feminine given nam
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 0x52fb5cc3012da4b974bfac981fd6cf3fb06a0e8e66670cb868593f2eafc251f1. Chain 2 (Bitcoin): anchored in block 953869 (2026-06-16T01:20:04Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/060027be-6809-4ec4-98fd-9340391c63a4.json and https://artists.proofprofile.net/proofs/artist/060027be-6809-4ec4-98fd-9340391c63a4.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).