Railgun is a privacy system built directly for blockchain, currently supporting Ethereum, BNB Chain, Polygon, and Arbitrum. It primarily utilizes zero-knowledge proofs to anonymize transactions in smart contracts and DeFi applications. Railgun provides only on-chain smart contract logic, thus eliminating the need for L2 validators and vulnerable cross-chain bridges to achieve privacy. The article discusses the Railgun privacy system’s mechanisms, tokens, governance, rewards, and the V3 upgrade, offering comprehensive information to readers.