This is the biggest attendance at a sporting event held in an enclosed stadium. The crowd number is an unofficial number - the official crowd (people who paid tickets) that day was 173,850. Due to its large capacity, Maracana stadium has many more reported sporting events with large attendance figures.
Bitcoin is a digital currency (also called crypto-currency) that is not backed by any country's central bank or government. Bitcoins can be traded for goods or services with vendors who accept Bitcoins as payment.
Bitcoin is a decentralized cryptocurrency that offers pseudonymity to its users. Although a Bitcoin has no intrinsic value, it's becoming an increasingly popular form of digital currency, attracting venture capitalist attention, from Fred Wilson of Union Square Ventures to the Winklevoss twins. There is a limited supply of Bitcoins, 21 million in total, with 11 million currently in circulation. While Bitcoin allows you to keep your identity concealed, the block chain acts as a public ledger of every Bitcoin transaction.