Bitcoin and China. NurPhoto/ Getty ImagesNurPhoto/ Getty Images A Library of Congress report found 51 countries have total or near-total bans on crypto. That's more than twice as many as three years ago when the last report was published. China roiled markets earlier this year with a sweeping ban on activity in the crypto sector. Sign up here for our daily newsletter, 10 Things Before the Opening Bell . China isn't the only country to ban cryptocurrencies. In fact, another 50 countries have placed bans on crypto, according to a report from the Global Legal Research Directorate of the Law…