Coda Protocol, the world's lightest blockchain, provides a foundation for the decentralized digital economy (Web 3.0), offering scalability to thousands of transactions per second, millions of users, and years of transaction history without sacrificing security. By utilizing recursive zk-SNARKs, the Coda blockchain always stays the same size—about 20 kilobytes (the size of a few tweets). Recursive zk-SNARKs allow nodes to rapidly share and update proof of the correct blockchain state across the network. This breakthrough application of zk-SNARKs solves the issues of scalability and high barrier to entry for nodes that have plagued legacy blockchains to-date. By making it easier for nodes to participate, Coda improves decentralization and therefore security of the network. The Coda blockchain can be easily accessed from any device, including phones and browsers, and can be seamlessly integrated into new decentralized applications (dapps).