Bitcoin rebounds from 30,050 yesterday morning to 41,700 this morning, a quick 38% gain ....
IB now offers trading in mini-bitcoin futures .... each contract represent 1/10 of a bitcoin versus 5 bitcoins for the regular contract.
I started trading a very small position yesterday and booked some profits this morning. If the volatility continues, then I'll systematically be making profits by buying weakness and selling strength.