LDK (Lightning Dev Kit) LDK is a library , not a daemon. Provides Rust crates with C/Swift/ Kotlin/JS bindings. Used by Mutiny Wallet, Cash App, Casa, ldk-node, Phoenix (parts), etc. Crates (selected) - — core protocol logic. - — async TCP transport. - — file-based persistence. - — background task driver. - — chain sync. - — alternative tx-only sync. - — fast gossip via signed snapshot. - — BOLT11 invoice handling. - — opinionated bundling for quick-start. - — LSP client/server primitives. - integration crates. Core primitives User code provides: - KeysManager — produces/derives keys. - Netwo…