Solana was founded by former Qualcomm, Intel and Dropbox engineers at the end of 2017. It is a single-chain entrusted proof-of-stake protocol that focuses on providing scalability without reducing decentralization or security. The core of Solana's extended solution is a decentralized clock called "Proof of History (PoH)", which aims to solve the time problem in a distributed network where there is no single trusted time source.