The Coinbase cryptocurrency exchange says the value of Bitcoin continued to fall over the weekend as it dropped below $34,000.
The world's largest cryptocurrency by market value has now fallen by 50% since its peak in November last year.
Bitcoin accounts for about a third of the cryptocurrency market with a total value of $636bn.
Ethereum, the second-biggest cryptocurrency in the world, has also fallen in value, down by more than 10% in the last week.