Is there a "first bought, first sold" clause in US tax law regarding securities, or is it the average purchase value of your total holdings during a sale that counts?
E.g. I buy 10 BTC for $1 and then buy 10 BTC for $50 and then sell 10 BTC for $100: I have to pay tax on ($100-$1)
E.g. I buy 10 BTC for $1 and then buy 10 BTC for $50 and then sell 10 BTC for $100: I have to pay tax on ($100-$1)