PlanB tells his 517,300 Twitter followers that he's willing to keep the most popular cryptocurrency until it reaches his target price or zero. Last week's Bitcoin sell-off resulted in massive losses totaling tens of billions of dollars. Based on the stock-to-flow (S2F) model, the analyst earlier forecast Bitcoin would approach $100,000. PlanB is well renowned for being the first to apply the stock/flow model to forecast Bitcoin's future.