The mid-$19K range had proven strong resistance for Bitcoin (BTC-USD) over the past three weeks, but the bulls have finally pushed through this morning. Curiously, it was nearly three years ago to the day when Bitcoin first crested $20K - it stayed above that level for a handful of minutes, before crashing to the $4K over the ensuing few months.The most popular of cryptos is currently changing hands at $20.25K. The Grayscale Bitcoin Trust (GBTC) is up 2.9% in premarket action.Recent news items of note include MassMutual investing $100M in Bitcoin, and Microstrategy raising $635M to add to its big stake.