Founder of an exchange: The platform was hacked yesterday, possibly by hackers connected to Mercado Bitcoin.
$BTC is now at 76674.52, down 0.27% over 24 hours. Watch two things next: whether trading volume picks up and whether the price can sustain its momentum. Short-term volatility may increase, so keeping your position small would be prudent. Don't make a judgment based on a single data point; compare at least a few different factors.