Who pays taxes for using btc as a means of exchange? Taxes only apply when currency (fiat) change hands; buying/selling btc, not paying for services with btc. Bitcoin has been labeled a commodity by the sec and CFTC. Would you pay taxes after giving your plumber some gold for his work? Same applies to bitcoin. Plus, the blockchain doesn't send an IRS form of evey sat you've "sent" from your accounts. Think getting "paid under the table". However, coinbase and other exchanges do send IRS forms of all the SATs you've stacked and the cost basis and if you've sold SATs for currency (fiat).