Petro is a cryptocurrency that was created by the government of Venezuela and issued in 2018. It’s supposedly backed by the country's reserves of oil and minerals and is acting as a way to supplement the plummeting value of the Bolivar (the currency of Venezuela). The Sovereign Bolivar was created in the Summer of 2018 and is said to be linked directly to the value of a Petro coin. As of 2022, paying for government document services or airplane fuel (a fee included with international flights from Venezuela) with Petro is mandatory. You can only purchase Petro on the official website or from verified Venezuelan crypto exchanges.