Bitcoin: was launched in January 2009. It introduced a novel idea set out in a white paper by the mysterious Satoshi Nakamoto.
It introduced Bitcoin as an online currency without any central authority, unlike government-issued currencies. There are no physical coins, only transactions recorded on a cryptographically secured public ledger.
Bitcoin wasn't the first attempt at an online currency of this type but it was the most successful. It has become known as the predecessor to virtually all cryptocurrencies that have emerged since as a result.
Etherium
Blockchain technology is being used to create applications that go beyond just enabling a digital currency. Launched in July 2015, Ethereum is the largest and most well-established open-ended decentralized software platform.
Ethereum enables developers to build and deploy smart contracts and decentralized applications (dApps) without downtime, fraud, control, or interference from a third party. It comes complete with its own programming language that runs on a blockchain to accomplish this.
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