Bitcoin is considered the mother of all currencies because all coins price depend on BTC. Bitcoin was introduced in 2009 with a lower rate. But the law rate would become high at the end of 2017. At that time btc hits 20000 usd.
But Bitcoin could not retain the price of 2018. The running year is considered as law year for all coins because in this running year all coin price falls from high to law rate. In this year bitcion falls from 20000 to 50000. this is the so bad news for all.
Some predict that bitcoin again hit 20000 by the end of this year. So i suggest all who are engaged with bitcion or others coin do not loss hope. Bitcoin must exceed the past record by the end of this current year according to some renown source,