Who was introduced in 2015 by a Russian-Canadian programmer Vitaly "Vitalik" Buterin?

Ethereum was introduced in 2015 by a Russian-Canadian programmer Vitaly "Vitalik" Buterin. It is an open-source platform that utilises blockchain technology to create and execute distributed applications (DApps). Users can create or join so-called "smart contracts" directly without third parties, limiting the possibility of fraud. Ethereum is commonly used as a name of the associated cryptocurrency but in fact Ethereum is the system or network while Ether or ETH is the native currency. Users need to have Ether when they want to execute a certain transaction through the system of ETH to BTC

.