I've browsing and interacting with ZKSync ,which i came across sign a signature 
I was curious to know how i can create a function like transfer ETH or possibly ERC20 token using signature, i know there is a string in each signature which is message called usually, and I think in this message we should enter what we want to do, but I don't know how?
Anyone can write a function that can call a function like the image?? Thanks
