Bitcoin Tumbles as Cryptocurrency's 2019 Surge Starts to WaverJun 30 2019, 11:39 PMJul 01 2019, 4:02 AMJune 30 2019, 11:39 PMJuly 01 2019, 4:02 AM(Bloomberg) -- Bitcoin slumped, undoing some of this year’s epic rally and amplifying a recent trend of outsized weekend moves.Disclaimer