This is pretty tricky because I've sent lots of coin between exchanges and arbitraged btc and alt coins. So I'll try telling my accountant "I bought some btc at btce and sent it to mcxnow where I traded worldcoin. Then I bought litecoin and sent to cryptsy where I bought ppc and sent it back to btce. I now have a portfolio of usd, btc, ltc, ftc, and xpm which have weekly fluctations inbetween some value and no value."