OBV is a volume-based measure that tries to get a handle on cash flows. It is plotted with the BTC/USD exchange rate. Not surprisingly, inflows to BTC are causing its price to rise. The BTC/USD market is a normal market determined by supply and demand. So far, there is no evidence indicating that demand has started to fall, triggering a bear market. This does not mean that there is not a bubble, nor that prices will fall in the future. This is a correlational, not predictive analysis. Besides, technical analysis is a waste of time, given the randomness in this market and lack of external referents by which reasonably objective valuations can be made.