Cryptocurrency is still under pressure this morning following tweets from Tesla (TSLA) CEO Elon Musk that rattled the market over the weekend.Bitcoin (BTC-USD) is down 8% to about $45,000, but it's off its lows today of just below $43,000.Ethereum (ETH-UDS) is off 9% to around $3,500, with earlier lows nearing $3,100.Dogecoin (DOGE-USD) is down 5.5% to about $0.59, having hit $0.45 earlier."To clarify speculation, Tesla has not sold any Bitcoin," Musk tweeted just before 2 a.m. ET.A Twitter war broke out over the weekend between Musk and bitcoin fans, with Musk suggesting Sunday that Tesla has already or intends to unload its $1.5B in bitcoin holdings.Musk was "taking on all comers on Twitter over the weekend and caused some chunky gyrations across the coins," Chris Weston, head of research at Pepperstone Group, writes in a note, according to Bloomberg.Musk began Sunday afternoon by making fun of Microstrategy's (MSTR) Michael Saylor, and things devolved from there. At one