99EX-BTC, ETH, LTC

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Newly added:
1. KYC overseas authentication supports netverify face recognition;
2. New types of high-level price limit order ;
3. The introduction of KYC on the home page of the new legal currency;
Optimization：
1. Current/historical order of token and UI optimization of currency bills;
2. Index accuracy optimization;
3. UI and IM push optimization of legal currency on home page;
4. Optimizing other texts;