Nxt

Nxt is an open-source blockchain platform that was launched in November 2013 and is the first to rely entirely on a proof-of-stake consensus protocol. Written from scratch in Java, it has influenced many other projects and has proven to be one of the most tested and reliable platforms in the industry. Nxt has a user-friendly and decentralized asset exchange, and its simple but flexible architecture makes it easy for blockchain adoption. It has been live for over 6 years with no downtime, major bugs, or successful exploits and has a reputation as one of the most secure platforms in the industry.