were a Japanese vocal group consisting of twin sisters Emi (, Itō Emi) and Yumi Itō (, Itō Yumi).Real names Hideyo (, Itō Hideyo) and Tsukiko Itō (, Itō Tsukiko) respectively. They were born in Nagoy
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 0xdbb4288ee2de4bf860d33186830dcc368d25b4b624435f45ccbf15a96dbe5a1d. 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/310b2edf-1ec6-498b-9fdf-2e56f756a869.json and https://artists.proofprofile.net/proofs/artist/310b2edf-1ec6-498b-9fdf-2e56f756a869.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).