After an event emits from my smart contract and I hear it server-side, I want to call a certain function in the smart contract and pass it some information to use.
I'm wondering how you place a transaction server-side. In this question it seems simple: Signing a transaction server-side
but how does the server-side know which account to use/private key. Browser-side it pops-up metamask and the user physically signs it. How does server-side do that? There is nobody to physically sign it and no where for it to pop-up?
Thanks for any help!