Binance Smart Chain – Why BNB Chain Is Not Working

BNB is the native currency of the Binance Smart Chain, just like ETH is the native currency of Ethereum.

So there is no contract address for BNB.

If you really want a BEP20 token matching your BNB you should convert them to Wrapped BNB (WBNB).

You can find more information here.

You are paying the fees for the network to mine your transaction. So in case, Binance to your BTC wallet. Centralized exchanges generally charge more for withdrawls. Unfortunately, you dont have much of a choice here. If you plan to use BNB chain, you are basically getting wrapped BTC and not the actual stuff. They tend to be cheaper. But transferring to a cold wallet, use the actual BTC network.

For your 2nd qn - The BNB or ETH are required to pay miners/validators to process ur transaction. This is generally paid in the native chain token (BNB - for BSC and ETH - Etherium). I assume you want to transfer a BEP20 or ERC20 token.