Bitcoin continued its move lower Friday, struggling to find footing after a week of pain for the world's largest cryptocurrency.

The digital asset hit a low of $4,119 Friday, according to data from CoinDesk, bringing its seven-day losses to more than 25 percent. In dollar terms, bitcoin's value dropped by about $1,400 over that time frame.

Other cryptocurrencies didn't hold up this week either. Not a single one in the top 28 by market capitalization was trading in the green Friday, according to CoinMarketCap.com. XRP, the second-largest by market capitalization, fell 6 percent Friday, bringing its one-week losses to 10 percent. Ether was down 7 percent in 24 hours and lost roughly 30 percent for the week.

The total market capitalization for cryptocurrencies fell to $138.6 billion Friday, according to CoinMarketCap data, its lowest level since September 2017. Since its peak, the market has lost about $700 billion in value, according to the data.

The tumble for bitcoin started abruptly last week when it fell below $6,000 and hit a new low for the year. The plunge followed what had been a surprisingly calm few months for bitcoin and a break from the rest of its volatile trading year. Since then, prices have hit new 13-month lows and struggled to move out of the $4,300 range.

The price dips are a stark contrast from last Thanksgiving when the cryptocurrency was entering a hot streak thanks to a wave of new retail investors. Since that holiday week last year, prices are down by more than 55 percent.