Solana was founded by former engineers from Qualcomm, Intel and Dropbox at the end of 2017. It is a single chain trust proof of interest agreement, which focuses on providing scalability without reducing decentralization or security. The core of Solana's extended solution is a distributed clock called "historical proof (POH)", which aims to solve the time problem that there is no single reliable time source in the distributed network. By using a verifiable delay function, poh allows each node to generate a timestamp locally using sha256 calculation. In this way, there is no need to broadcast timestamp on the whole network, which improves the overall network efficiency. Sol is the local token of Solana blockchain. Solana uses a delegated proof of interest consensus algorithm to motivate token holders to validate transactions. As part of Solana's security design, all costs will be paid in sol and burned, thus reducing the total supply. This deflationary sol mechanism encourages more token holders to participate in shares, thus improving network security.