Bitcoin dropped 6.39% to $43,165.78 on Sunday, losing $2,944.20 from its previous close.
Bitcoin, the world's biggest and best-known cryptocurrency, has fallen 26% from the year's high of $58,354.14 on February 21 when it soared amid increasing confidence that it will become a mainstream investment and payments vehicle.
Major firms such as BNY Mellon, asset manager BlackRock Inc and credit card giant Mastercard Inc have backed cryptocurrencies. Tesla Inc, Square Inc and MicroStrategy Inc have invested in bitcoin.
Ether, the coin linked to the ethereum blockchain network, dropped 8.88% to $1,329.46 on Sunday, losing $129.57 from its previous close.