The day before, the value climbed up to 38,000 dollars, followed by a post from Tesla founder Elon Musk.
Musk, who himself has invested in bitcoin, wrote that in the battle between fiat currencies and cryptocurrencies - he chooses cryptocurrencies.
By Fiat currencies is meant money that is not linked to any real value, such as a gold coin base, and thus includes dollars and Swedish kronor.
Despite Elon Musk's supportive remarks, the value of several cryptocurrencies shook on Sunday.
In the past month, questions about climate costs, regulations and taxes have put a wet blanket over the burning crypto market.
Most major cryptocurrencies have fallen in the last seven days. In terms of development from 1 January, however, almost all cryptocurrencies in the top 20 have risen, some as much as 5,000 per cent.