Create lnd.nix

system/bitcoin/lnd.nix

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+{
+  ### LND
+  # Set this to enable lnd, a lightning implementation written in Go.
+  # services.lnd.enable = true;
+  #
+  services.lnd = {
+    enable = true;
+    port = 9736;
+  };
+
+  # NOTE: In order to avoid collisions with clightning you must disable clightning or
+  # change the services.clightning.port or services.lnd.port to a port other than
+  # 9735.
+  #
+  # Set this to create an onion service by which lnd can accept incoming connections
+  # via Tor.
+  # The onion service is automatically announced to peers.
+  # nix-bitcoin.onionServices.lnd.public = true;
+  #
+  # Set this to create a lnd REST onion service.
+  # This also adds binary `lndconnect` to the system environment.
+  # This binary generates QR codes or URLs for connecting applications to lnd via the
+  # REST onion service.
+  # You can also connect via WireGuard instead of Tor.
+  # See ../docs/services.md for details.
+  #
+  # services.lnd.lndconnect = {
+  #   enable = true;
+  #   onion = true;
+  # };
+  #
+  ## WARNING
+  # If you use lnd, you should manually backup your wallet mnemonic
+  # seed. This will allow you to recover on-chain funds. You can run the
+  # following commands after the lnd service starts:
+  #   mkdir -p ./backups/lnd/
+  #   scp bitcoin-node:/var/lib/lnd/lnd-seed-mnemonic ./backups/lnd/
+  #
+  # You should also backup your channel state after opening new channels.
+  # This will allow you to recover off-chain funds, by force-closing channels.
+  #   scp bitcoin-node:/var/lib/lnd/chain/bitcoin/mainnet/channel.backup ./backups/lnd/
+  #
+  # Alternatively, you can have these files backed up by services.backups below.
+}