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 digital asset and a payment system invented by an unidentified programmer, or group of programmers, under the name of Satoshi Nakamoto. Bitcoin was introduced on 31 October 2008 to a cryptography mailing list, and released as open-source software in 2009.