If I don't have anything in a crypto wallet, I haven't bought or sold any crypto, but mined it, and have no documentation of any kind with info needed, do I pay tax?

I'm completely new to all of this. I have mined crypto with a program, the last I knew the crypto didn't even price yet, I just received a message about some KYC thing  last week, eventually completed that and I'm not sure what to do. I've been mining this crypto for 3 years. I have no information, no .svc something. How do I pay tax on it, if I even do?  Not currently employed. Looked all over the internet trying to find an answer to this. Please help!!