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In case the funding manager detects that a funding flow is requested to be executed with the help of a PsbtIntent, the normal channel negotiation with the remote peer is interrupted, as soon as the accept_channel message was received. With the remote peer's funding multisig key and our local key, we can derive the funding output script and its address. This is enough to start the PSBT funding and signing process which the user will do externally to the daemon.
lnwallet
The lnwallet package implements an abstracted wallet controller that is able to drive channel funding workflows, a number of script utilities, witness generation functions for the various Lightning scripts, revocation key derivation, and the commitment update state machine.
The package is used within lnd as the core wallet of the daemon. The wallet
itself is composed of several distinct interfaces that decouple the
implementation of things like signing and blockchain access. This separation
allows new WalletController implementations to be easily dropped into
lnd without disrupting the code base. A series of integration tests at the
interface level are also in place to ensure conformance of the implementation
with the interface.
Installation and Updating
$ go get -u github.com/lightningnetwork/lnd/lnwallet