Satoshi Nakamoto is an anonymous character or organization who created Bitcoin and created the Bitcoin Core (formerly Bitcoin-Qt) open source software for the public use of Bitcoin. Bitcoin started designing in 2007 when he believed that it was possible to create a trading system where members do not need to trust each other. The Bitcoin development community had gradually lost contact with Satoshi since mid-2010 after he gave Gavin Andresen an alert when the Bitcoin network was hacked. This key can be used to alert the entire system to stop the transaction. So far, the exact identity of Satoshi Nakamoto is unknown.