Why can't transfer tokens between different chains?

With the development of public chains, exchanges are also launching their own public chains, such as the Binance Smart Chain (BSC) launched by Binance, the Huobi Eco Chain (HECO) launched by Huobi, and OKExChain launched by OKEx.

The same asset will appear on different public chains due to the increasing demand for cross-chain. For example, USDT can be circulated in ETH, TRX, BSC, HECO, etc., but they are not completely consistent and cannot be transferred directly to each other. Moreover, the address formats of ETH, BSC, HECO, and OKExChain are all the same, which often leads to errors in user transfers or withdrawals.