BTokens are token assets, hosted on a blockchain, that are pegged in value to the assets they represent. This allows users to transfer their tokens from one blockchain to another, expanding the utility of the tokens to work on multiple networks.
Withdraw Btokens to BSC network or Ethereum from Binance.com by selecting the menu [Wallet] - [Spot] - [Withdraw]. Make sure you select the correct protocol (ex. BSC with BEP20 and Ethereum with ERC20) and withdraw address successfully.