lnd:lnd rests on top of. lnd needs a way to communicate with the underlying blockchain in order to send on-chain payments, create channel open/close transactions, and watch for events on the blockchain.lnd nodes add each other as peers so they can send messages between one another via an encrypted connection. For example, the lncli connect adds a peer, which are identified by identity pubkey and IP address.lncli openchannel command opens a channel with a node that was already connected at the peer layer, and the lncli describegraph command returns the list of edges and vertices of the payment channel graph.lnd / lncli: lnd stands for Lightning Network Daemon and serves as the main software component driving the Lightning Network. It manages a database, connects to peers, opens / closes channels, generates payment invoices, sends, forwards, and revokes payments, responds to potential breaches, and more. lncli opens up a command line interface for driving lnd.lnd. Neutrino is not required from an application development standpoint, but can be regarded as the primary way for an
end-user of lnd to interact with the Bitcoin Network and the applications
built on top of it.lnd.lncli is the lnd command line tool. All commands are executed instantaneously. A full list of commands can be viewed with lncli --help. To see a breakdown of the parameters for a particular command, run lncli <command> --helplnd. It includes simple methods that return a response immediately, as well as response-streaming and bidrectional streaming methods. The Beginner's Guide focuses on interacting with the gRPC API via Typescript.lnd also features a REST proxy someone can use if they are accustomed to standard RESTful APIs. However, REST does not have full streaming RPC coverage.lnd interfaces are documented in the API Reference, featuring a description of the parameters, responses, and code examples for Python, Javascript, and command line arguments if those exist.