Googling it, they are introducing a new base currency, called the Sovereign Bolivar.
https://www.finder.com.au/venezuela-to-use-petro-as-accounting-unitThe first-ever national cryptocurrency, along with the Bolívar Soberano, will become an economic measure.
Venezuela will begin using its controversial, US-banned Petro cryptocurrency as an authoritative accounting unit from the beginning of next week, according to the country's President Nicolás Maduro.
ABC International reports that during a recent televised interview Maduro revealed Venezuela and its state-run oil and gas company Petróleos de Venezuela (PDVSA) will use the digital currency and the South American nation's new Petro-backed sovereign bolivar currency as mandatory accounting units from Monday 20 August.
So, the current plan is that they mined a bunch of crypto-currency token and they're going to use them as a form of government accounting. To be honest, it's a
good idea, because cryptocurrency tokens aren't that easy to forge or embezzle, since there's a permanent ledger. For an internal accounting system for a large organization, it's a concept with merit. According to this the new setup is starting on August 20th:
https://venezuelanalysis.com/news/13997It's hard to say what's going to happen here, the language used by Maduro isn't really confidence inspiring: "detailed explanations of the salary system and the prices based on the Petro will be forthcoming on August 20" which sounds like some sort of
price controls again. But one possibility is that people informally exchange the old money for the new money, if the new money is more stable (even if relatively). That would help to maintain value for the new money.
As far as the "Petro" crypto-currency goes I came across an article claiming the Venezuelan government has sold
zero of them. So there's some sort of missing fact here. If they were a "money raising" scheme as is often suggested, why haven't they sold
even one of them? Even a really shitty kickstarter gets a couple of backers. So, if they sold
none then it makes a lot more sense that they were actually intended to be an internal form of accounting for the government, and that does seem to be what they're doing: "pegging" the new Bolivar to the Petro but using the Petro exclusively for internal accounting.