Canvas

Canvas is an embedded application database, similar to a fully-distributed version of Firebase or Supabase.

It allows you to build multiplayer, real-time, and offline-first applications, where each application is defined as a local bundle that replicates and verifies all user interactions.

Canvas applications are easy to configure and have several useful properties:

• Instant sync. No transaction fees or confirmation wait times. Any number of peers can concurrently execute new actions, without waiting for consensus.
• Real-time p2p. Peers connect and sync directly with each other over libp2p, and use GossipSub topics to broadcast actions.
• Eventually consistent and convergent. Actions can freely read and write to a relational database. Every peer's database state will deterministically converge regardless of the order in which actions are received.
• Self-authenticating. Every action is signed by a session key authorized by a cryptographic identity, e.g. a Sign in with Ethereum address or did:plc identifier. The entire action log can be verified and replayed by anyone at any time; applications are trustless and portable.
• Cross-platform. Canvas apps run in the browser, server, or mobile devices. They persist data to IndexedDB in-browser, SQLite with on-disk storage, or Postgres with an in-memory Merkle index.
• Open-source. Built in the same spirit as libp2p and IPFS.

For more information, see the Canvas documentation.

Using Canvas

To install the latest published CLI:

npm install -g @canvas-js/cli

Commands

• canvas init <path>: Initialize a sample application
• canvas info <path>: Display application metadata
• canvas run <path>: Run an application
• canvas export <path>: Export the action log as JSON to stdout
• canvas import <path>: Import an action log from stdin

You can run each command with --help for more detailed documentation.

Contributing

Canvas is currently developed and maintained by a small team. For suggestions or contributions, we recommend first opening an issue or discussing with an existing contributor before opening a pull request.

For information about how to build this repo, see DEVELOPING.md.

License

MIT © Canvas Technologies, Inc.