LDK

LDK is a modular Lightning implementation written in Rust. Instead of running as a standalone daemon, it exposes the Lightning state machine as a set of libraries that a wallet can link against. The wallet controls storage, networking, key management, and the on-chain backend.

This design is aimed at mobile and custom wallets that cannot run a traditional lnd or Core Lightning process but still want native Lightning support. LDK is used by Cash App, Mutiny, Bitkit, and several other wallets.

The project lives at github.com/lightningdevkit. Related companion libraries include Rapid Gossip Sync for pathfinding data, VLS for separating signing from the rest of the node, and ldk-server for running LDK as a standalone daemon.

References

• lightningdevkit.org
• lightningdevkit/rust-lightning
• LDK docs
• ldk-server
• Rapid Gossip Sync
• Validating Lightning Signer