Mandy Sekiguchi (関口 メンディー; Sekiguchi Mendi, born January 25, 1991) is an American-born Japanese actor, dancer, rapper and a former member of J-Pop groups Generations from Exile Tribe, Exile and Honest
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 0x0349c8c88ca350cd1a2331f9a3f210c300a3173c61a2eb14f4a214c3265bd441. Chain 2 (Bitcoin): anchored in block 953922 (2026-06-16T09:36:34Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1b19b80f-ce4e-4e1d-aa66-34d1cc726285.json and https://artists.proofprofile.net/proofs/artist/1b19b80f-ce4e-4e1d-aa66-34d1cc726285.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).