Download MathWallet: https://www.mathwallet.org
The Binance Chain/Binance Smart Chain can realize the cross-chain asset transfer. Next, we will illustrate how to transfer the assets from Binance Chain to Binance Smart Chain.
Switch to the Binance Chain and open the Cross Chain Transfer tool in DApp store.
Enter the amount of transfer and the Binance Smart chain address
Click Transfer to finish cross chain asset transfer
The operation of cross chain tranfer on Binance Smart Chain and Binance Chain is the same, you can just switch to different chain to start transfer.
This is an open source tool, and its code can be found at:
https://github.com/mathwallet/BSC-Cross-Chain