[dillondoyle]

I've wondered what to do if I won't or can't prove that I control BTC that I transferred out of coinbase wallet into personal wallets?

I will definitely pay my cap gains on the small amount of coin I sold (BTC->USD within coinbase). But I have no idea about first in first out, when is it a wash if I buy more?

I don't even want to think about trying to calculate cap gains on purchases made with BTC since the price is almost always different even if I buy BTC on coinbase and use it to buy server time 60 minutes later..