Rin Usami (宇佐見 りん, Hepburn: Usami Rin, born 16 May 1999) is a Japanese novelist. Career Usami was born in Numazu, Shizuoka, and raised in Kanagawa Prefecture. For her first work Kaka (かか) she was a
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 0x8ac7d43b7343530e38d731e699971433b9d1917f1a5178b6d1772e5285470cea. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5ca200bd-043a-45d0-8f12-1e6dcdaa2741.json and https://artists.proofprofile.net/proofs/artist/5ca200bd-043a-45d0-8f12-1e6dcdaa2741.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).