peterschreiber.media/iStock via Getty Images Mexico's central bank warns that banks in Mexico aren't permitted to conduct cryptocurrency transactions after Mexican billionaire Salinas Salinas Pliego said bitcoin (([[BTC-USD]] +5.9%)) is a good investment. Mexico's central bank cited the volatility of cryptocurrencies and the fact that they're not backed by any government, the Associated Press reports, citing people familiar with the matter. The central bank said in a statement, "whoever issues or offers such instruments will be held responsible for violating those rules and will be subject to the applicable sanctions." Salinas's bank was the primary beneficiary of a bill submitted in 2020 to make the central bank purchase U.S. dollars that private banks cannot get rid of; he sent out a graphic that said, "The dollar has silently stolen your purchasing power since 1913. Buy Bitcoin!" Bitcoin is up 7.5% to $34.6K from yesterday.