EveryBit.js is an open source user management and messaging platform written in JavaScript. The messaging system supports multiple file types and provides the ability to send content with 256 bit AES encryption. The system utilizes ECDSA signed static content units called puffs. Puffs are JavaScript objects composed of a single content type. Each puff has a unique signature which can be used to verify the authenticity of its author and the integrity of its contents.