Core-lightning architecture: - Main daemon: lightningd - Sub-daemons: hsmd, gossipd, connectd, etc. - Plugins: arbitrary scripts to customize the node. This follows UNIX philosophy: "Do one thing and do it well".

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Blockstream runs many nodes, with no control on any of the funds of the user, nor of his keys: It's a VLS signer on the user side that talks to hsmd through a proxy to use the node.