Bitcoin: a Brief History
The concept of digital currency is not new. There have been footprints of digital currency dating back to 1983, though in theories only. Since 1983, there have been many transformations, experiments, implementation glitches, as well as decentralization issues in the development of the first decentralized cryptocurrency. In 2009, Bitcoin was eventually launched as the first-ever decentralized cryptocurrency, courtesy of Satoshi Nakamoto. However, even before Bitcoin, there were several other digital coins like e-gold and Digicash among others, which somehow crashed.

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Source https://blockster.com/blockdesk/1217_bitcoin-vs-ethereum-a-brief-history