Bitcoin is the world's first decentralised digital payments system. In the beginning of this decade, very few people knew about it and they were mostly ...
source https://www.google.com/url?rct=j&sa=t&url=http://www.copyright.com/blog/distributed-ledgers-the-key-concept-behind-bitcoin-and-the-cryptocurrency-hype/&ct=ga&cd=CAIyGmM2Nzk3ODA2ZWViNjVjODI6Y29tOmVuOlVT&usg=AFQjCNHQ8pP9ngB29VoiDO0bpSr60nDn2Q
