[dublinben]

This is an even greater hurdle to overcome now that spending a Bitcoin is a taxable event. According to the IRS, precisely which Bitcoin you spend has significant consequences. Without fungiblity, Bitcoin is not a practical currency.

[mrkent]

Applications that will automatically keep track of these events are on the horizon. The cryptocurrency industry is still in its infancy.

[2drew3]

Great point. Hopefully, IRS will reconsider and treat BTC as a currency.