BNB/BTCB trading pair is in MathWallet

What is the usage of BTCB?
1 BTCB has the same value as BTC, and can be exchange to BTC in
2 You can buy BTCB in BinanceDEX, current support BNB/BTCB trading pair, and future will be more
3 You can transfer BTCB in Binance Chain, it super fast and low cost

The detail instruction of how to use BinanceDEX in MathWallet: