On Sunday, Bitcoin fell 1.54% to $19,804.
This made the coin fall below the $20,000 mark.
The coin lost its value by $310 since its last close.
The biggest and most well-known cryptocurrency in the world has lost 58.9% of its value since March 28.
At that time it was worth $48,234.
Ether, the coin linked to the blockchain network Ethereum, fell by 3.2 percent on Sunday to $1,422.1.
This was $47 less than where it was the day before.