You can see that Bitcoin is in a downtrend since May 2014 (blue line) and that the very large uptrend since 2012 has not been broken, yet. That could only happen between January-March 2015.
I also never draw trend lines, because as you can see with this single example two people easily came to two different conclusions and you don't know what the rest of the market thinks. Doing so in a 4 hour chart is even more risky, if you ask me.
The only trend lines I 100% obey to are horizontal support and resistance lines using the lowest low and highest high price, and if you want to be 120% safe to see the same uptrend or downtrend as everybody, then use candle bodies and not shadows to draw these horizontal lines. I then mainly use bars not candles (equal to OHLC on BitcoinWisdom).