This is super interesting to me. If you exchange your money from one currency to another (USD, Euro, etc.) and profit from doing this, do you need to pay taxes?

This is super interesting to me. If you exchange your money from one currency to another (USD, Euro, etc.) and profit from doing this, do you need to pay taxes? If not, is BTC treated as a currency, or as a security (eg. FB, TSLA) where you would obviously have to pay capital gains taxes.