I think on-chain interaction is a basic operation that every blockchain user must have, but most people first contact exchanges...

No matter what project you interact with on the chain, remember to use a few U funds to deposit and withdraw first, and then operate after the funds arrive...

Today, I just helped a user recover more than 8,000 U of loss.

But many times, due to operational errors, it cannot be recovered. Remember, remember! #WEB3