Venezuela is creating a digital currency to combat a financial blockade by the United States, President Nicolas Maduro has announced.

The Petro will be backed by Venezuela's oil and gas reserves and its gold and diamond holdings, the president said in his weekly television programme.

"This is going to allow us to move toward new forms of international financing for the country's economic and social development," the president said.

The government also announced the creation of a "blockchain observatory" - a software platform for buying and selling virtual currency.

Although the president did not offer many details, analysts such as Henkel Garcia see the possibility of success as limited.

"You can build it, but trust, acceptance and use is what will determine the cryptocurrency's success. For me, it will be quite limited. The bolivar is also backed by reserves and has no strength," said Mr Garcia, director of consultancy Econometrica.

"Confidence in a country is going to depend on the levels of production and the wealth it generates. For example, people trust the dollar for the levels of wealth associated with it," he added.

The announcement comes as Venezuela faces acute financing problems after creditors and ratings agencies declared the government and state-run oil firm PDVSA to be in partial default for missing interest and principle payments on bonds.

Mr Maduro blames sanctions imposed by the United States in August barring US citizens and companies from buying any new Venezuelan government or PDVSA bonds.

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Venezuela is mired in a deep economic crisis triggered mainly by a fall in crude oil prices and a drop in oil production.

Petroleum is its main source of hard currency.

Over the past year, the Venezuelan bolivar has plummeted 95.5% against the dollar on the black market.

Virtual currency is not new for Venezuela - considered by specialists a haven for bitcoin production with minimal costs.

It is estimated that tens of thousands of people mine bitcoin to protect themselves from inflation - set to surpass 2,300% in 2018 - by exchanging earnings for dollars or more bitcoin.

In Venezuela, the law does not expressly prohibit mining bitcoin - experts say officials are involved - but the authorities persecute those who do it for power theft.