Ergo (ERG) is a Resilient Platform for Contractual Money with the main focus to provide an efficient, secure and easy way to implement financial contracts. ERG is the native currency for the Ergo platform and also works as the transaction and storage fees to miners on the Ergo network. The Ergo network went live on July 1st, 2019 with no premine. Ergo is based on Autolykos PoW algorithm, the first PoW algorithm that is memory-hard and pool-resistant. Every coin in Ergo is protected by a program in ErgoScript, own scripting language based on Σ-protocols. Support of light nodes allows it to run Ergo DApps and implement offchain protocols in a truly decentralized way. Ergo's on-chain miner voting protocol allows gradual changes in a large number of parameters including maximum block size, storage fee factor and more. Ergo is a self‐amendable protocol, uses widely-researched solutions while also preventing performance degradation over time with a new economic model.