multi: optionally enable and signal anchor support

Defaults to disabled.

lncfg/protocol_legacy_off.go

@@ -15,8 +15,14 @@ func (l *ProtocolOptions) LegacyOnion() bool {
 	return false
 }
 
-// LegacyCommitment returns true if the old commitment format should be used
-// for new funded channels.
-func (l *ProtocolOptions) LegacyCommitment() bool {
+// NoStaticRemoteKey returns true if the old commitment format with a tweaked
+// remote key should be used for new funded channels.
+func (l *ProtocolOptions) NoStaticRemoteKey() bool {
+	return false
+}
+
+// AnchorCommitments returns true if support for the the anchor commitment type
+// should be signaled.
+func (l *ProtocolOptions) AnchorCommitments() bool {
 	return false
 }

lncfg/protocol_legacy_on.go

@@ -16,6 +16,10 @@ type ProtocolOptions struct {
 	// remote party's output in the commitment. If set to true, then we
 	// won't signal StaticRemoteKeyOptional.
 	CommitmentTweak bool `long:"committweak" description:"force node to not advertise the new commitment format"`
+
+	// Anchors should be set if we want to support opening or accepting
+	// channels having the anchor commitment type.
+	Anchors bool `long:"anchors" description:"EXPERIMENTAL: enable experimental support for anchor commitments. Won't work with watchtowers or static channel backups"`
 }
 
 // LegacyOnion returns true if the old legacy onion format should be used when
@@ -25,8 +29,14 @@ func (l *ProtocolOptions) LegacyOnion() bool {
 	return l.LegacyOnionFormat
 }
 
-// LegacyCommitment returns true if the old commitment format should be used
-// for new funded channels.
-func (l *ProtocolOptions) LegacyCommitment() bool {
+// NoStaticRemoteKey returns true if the old commitment format with a tweaked
+// remote key should be used for new funded channels.
+func (l *ProtocolOptions) NoStaticRemoteKey() bool {
 	return l.CommitmentTweak
 }
+
+// AnchorCommitments returns true if support for the the anchor commitment type
+// should be signaled.
+func (l *ProtocolOptions) AnchorCommitments() bool {
+	return l.Anchors
+}