Bitcoin has traded at its highest value to date, reaching $19,920.53 (£14,821) according to data-provider Coindesk.

It took the virtual currency nearly three years to top its previous record, when it peaked about $137 lower.

Bitcoin has risen in value by more than 170% since the start of the year.

Analysts suggest some investors have treated it as a "safe haven asset" at a time of uncertainty caused by the coronavirus pandemic, but others warn that it remains volatile.

Bitcoin fell below $3,300 at one point after reaching its previous high.

Other factors that have supported its recent rise include PayPal allowing its platform to be used to buy and sell the virtual coins in October, and a number of large institutional investors declaring interest in buying into funds tied to the crypto-currency.

Bitcoin peaks at new high close to $20,000 https://t.co/NrTPw8fY1w

— BitCoin News (@NewsForBitcoin) December 1, 2020

These include Guggenheim Partners, a Wall Street firm that announced on Friday it might put as much as $530m into a Bitcoin-related investment trust.

"It seems that barely a day goes past when we don't read a headline about a mainstream fund or company expressing an intention to put some of their holdings into Bitcoin," said Rhian Lewis, author of The Cryptocurrency Revolution.

"Price predictions are notorious for being wrong, so it's entirely likely there will be more dips and volatility.

"But this time it feels very different from the 2017 high - there seems to be more real demand, and the narrative is more measured."

She added that another factor was that investors are concerned that central bank efforts to deal with Covid-19 will fuel inflation.

Gold and other precious metals are traditionally used to hedge against such a risk.

But because in theory only a limited amount of Bitcoin can ever be created - it was designed to only let 21 million bitcoins be produced, of which about 18.6 million already exist - some favour it as an alternative.

If it does climb higher there could be sudden drops in value, however, as some traders will have set automatic sell orders pegged to it reaching the $20,000 mark.

One expert warned members of the public to be careful.

"Never invest money you can't afford to lose," said finance and economics writer Frances Coppola.

"Bitcoin is a speculative asset and has a history of sudden crashes. It's not worth risking your house or your life savings for it.

"And borrowing to invest in Bitcoin or other crypto-currencies is a bad idea unless you are a professional trader."