I have gone for business in about 45 minutes and 1BTC = $870. When I came back home and check the bitcoin prices, It dropped to $850. What just happened ? Can anyone tell me ? I have checked the cointelegraph and coindesk and still no result.
Relax mate, $20 dollar drops are nothing in bitcoin....

dont sit and watch the screen all day, store your bitcoin safely and everything will be fine, come back in the new year to see record highs.......