The chart shows that when Last halvening happened on 10th July 2016 then 50dsma was above 200dsma and this stayed for entire bull run ending in Jan 2018.
This time also 50dsma would have traded above 200dsma during halvening but thnx to corrona there happened to be sharp correction which is reversed by the time halvening happened on 12th May. Still BTC now has managed to do golden cross over on 22nd May.
It is highly likely now that this golden cross will be honourd for entire bull run for next 1-2 yrs. Stock, hold, and sit tight.