You dont pay tax for having crypto in your wallet but exchanges pay do, paying tax is acceptable in fiat as individuals or business owner, this are the registration you undergoes when you wanted your business to get established and registered under government rule, this act of paying tax is what has been in place since ancient days, so paying tax is as simple a the procedures in doing do as long as you're willing and interested in paying, government always had it accounts stipulated for doing so whenever you appear before them for paying.