From ce93b236aacdcb3f810c29fff3833228d74dea3c Mon Sep 17 00:00:00 2001
From: Olaoluwa Osuntokun <laolu32@gmail.com>
Date: Fri, 15 Sep 2023 17:51:45 -0700
Subject: [PATCH 1/3] input+lnwallet: modify musig2 interfaces use explicit
 optional local nonces

In this commit, we modify the musig2 interfaces to instead use an
explicit value for the local nonces. Before this commit, we used the
functional option, but we want to also support specifying this value
over RPC for the remote signer. The functional option pattern is opaque,
so we can't get the nonce value we need. To get around this, we'll just
make this an explicit pointer, then map this to the functional option at
the very last moment.
---
 input/musig2.go                 | 26 +++++++++++++++++---------
 input/musig2_session_manager.go |  4 ++--
 lntest/mock/signer.go           |  2 +-
 lnwallet/musig_session.go       |  2 +-
 lnwallet/rpcwallet/rpcwallet.go |  2 +-
 watchtower/wtmock/signer.go     |  2 +-
 6 files changed, 23 insertions(+), 15 deletions(-)

diff --git a/input/musig2.go b/input/musig2.go
index 4f7d19c089..28a15af738 100644
--- a/input/musig2.go
+++ b/input/musig2.go
@@ -49,12 +49,13 @@ type MuSig2Signer interface {
 	// already known, they can be submitted as well to reduce the number of
 	// method calls necessary later on.
 	//
-	// The set of sessionOpts are _optional_ and allow a caller to modify
-	// the generated sessions. As an example the local nonce might already
-	// be generated ahead of time.
+	// The localNonces field is optional. If it is set, then the specified
+	// nonces will be used instead of generating from scratch.  This is
+	// useful in instances where the nonces are generated ahead of time
+	// before the set of signers is known.
 	MuSig2CreateSession(MuSig2Version, keychain.KeyLocator,
 		[]*btcec.PublicKey, *MuSig2Tweaks, [][musig2.PubNonceSize]byte,
-		...musig2.SessionOption) (*MuSig2SessionInfo, error)
+		*musig2.Nonces) (*MuSig2SessionInfo, error)
 
 	// MuSig2RegisterNonces registers one or more public nonces of other
 	// signing participants for a session identified by its ID. This method
@@ -379,18 +380,18 @@ func combineKeysV040(allSignerPubKeys []*btcec.PublicKey, sortKeys bool,
 // MuSig2CreateContext creates a new MuSig2 signing context.
 func MuSig2CreateContext(bipVersion MuSig2Version, privKey *btcec.PrivateKey,
 	allSignerPubKeys []*btcec.PublicKey, tweaks *MuSig2Tweaks,
-	sessionOpts ...musig2.SessionOption,
+	localNonces *musig2.Nonces,
 ) (MuSig2Context, MuSig2Session, error) {
 
 	switch bipVersion {
 	case MuSig2Version040:
 		return createContextV040(
-			privKey, allSignerPubKeys, tweaks, sessionOpts...,
+			privKey, allSignerPubKeys, tweaks, localNonces,
 		)
 
 	case MuSig2Version100RC2:
 		return createContextV100RC2(
-			privKey, allSignerPubKeys, tweaks, sessionOpts...,
+			privKey, allSignerPubKeys, tweaks, localNonces,
 		)
 
 	default:
@@ -403,7 +404,7 @@ func MuSig2CreateContext(bipVersion MuSig2Version, privKey *btcec.PrivateKey,
 // BIP draft version 1.0.0rc2.
 func createContextV100RC2(privKey *btcec.PrivateKey,
 	allSignerPubKeys []*btcec.PublicKey, tweaks *MuSig2Tweaks,
-	sessionOpts ...musig2.SessionOption,
+	localNonces *musig2.Nonces,
 ) (*musig2.Context, *musig2.Session, error) {
 
 	// The context keeps track of all signing keys and our local key.
@@ -419,6 +420,13 @@ func createContextV100RC2(privKey *btcec.PrivateKey,
 			"context: %v", err)
 	}
 
+	var sessionOpts []musig2.SessionOption
+	if localNonces != nil {
+		sessionOpts = append(
+			sessionOpts, musig2.WithPreGeneratedNonce(localNonces),
+		)
+	}
+
 	muSigSession, err := muSigContext.NewSession(sessionOpts...)
 	if err != nil {
 		return nil, nil, fmt.Errorf("error creating MuSig2 signing "+
@@ -432,7 +440,7 @@ func createContextV100RC2(privKey *btcec.PrivateKey,
 // draft version 0.4.0.
 func createContextV040(privKey *btcec.PrivateKey,
 	allSignerPubKeys []*btcec.PublicKey, tweaks *MuSig2Tweaks,
-	_ ...musig2.SessionOption,
+	_ *musig2.Nonces,
 ) (*musig2v040.Context, *musig2v040.Session, error) {
 
 	// The context keeps track of all signing keys and our local key.
diff --git a/input/musig2_session_manager.go b/input/musig2_session_manager.go
index 4b1d412d12..827652cc20 100644
--- a/input/musig2_session_manager.go
+++ b/input/musig2_session_manager.go
@@ -63,7 +63,7 @@ func NewMusigSessionManager(keyFetcher PrivKeyFetcher) *MusigSessionManager {
 func (m *MusigSessionManager) MuSig2CreateSession(bipVersion MuSig2Version,
 	keyLoc keychain.KeyLocator, allSignerPubKeys []*btcec.PublicKey,
 	tweaks *MuSig2Tweaks, otherSignerNonces [][musig2.PubNonceSize]byte,
-	sessionOpts ...musig2.SessionOption) (*MuSig2SessionInfo, error) {
+	localNonces *musig2.Nonces) (*MuSig2SessionInfo, error) {
 
 	// We need to derive the private key for signing. In the remote signing
 	// setup, this whole RPC call will be forwarded to the signing
@@ -78,7 +78,7 @@ func (m *MusigSessionManager) MuSig2CreateSession(bipVersion MuSig2Version,
 	// Create a signing context and session with the given private key and
 	// list of all known signer public keys.
 	musigContext, musigSession, err := MuSig2CreateContext(
-		bipVersion, privKey, allSignerPubKeys, tweaks, sessionOpts...,
+		bipVersion, privKey, allSignerPubKeys, tweaks, localNonces,
 	)
 	if err != nil {
 		return nil, fmt.Errorf("error creating signing context: %w",
diff --git a/lntest/mock/signer.go b/lntest/mock/signer.go
index 1506112575..1d30204ea9 100644
--- a/lntest/mock/signer.go
+++ b/lntest/mock/signer.go
@@ -57,7 +57,7 @@ func (d *DummySigner) ComputeInputScript(tx *wire.MsgTx,
 // submitted as well to reduce the number of method calls necessary later on.
 func (d *DummySigner) MuSig2CreateSession(input.MuSig2Version,
 	keychain.KeyLocator, []*btcec.PublicKey, *input.MuSig2Tweaks,
-	[][musig2.PubNonceSize]byte, ...musig2.SessionOption,
+	[][musig2.PubNonceSize]byte, *musig2.Nonces,
 ) (*input.MuSig2SessionInfo, error) {
 
 	return nil, nil
diff --git a/lnwallet/musig_session.go b/lnwallet/musig_session.go
index f850f8cf6f..ecc60d07f1 100644
--- a/lnwallet/musig_session.go
+++ b/lnwallet/musig_session.go
@@ -260,7 +260,7 @@ func (m *MusigSession) FinalizeSession(signingNonce musig2.Nonces) error {
 	m.session, err = m.signer.MuSig2CreateSession(
 		input.MuSig2Version100RC2, m.localKey.KeyLocator, m.signerKeys,
 		&tweakDesc, [][musig2.PubNonceSize]byte{remoteNonce.PubNonce},
-		musig2.WithPreGeneratedNonce(&localNonce),
+		&localNonce,
 	)
 	if err != nil {
 		return err
diff --git a/lnwallet/rpcwallet/rpcwallet.go b/lnwallet/rpcwallet/rpcwallet.go
index f8201905f5..d805ed45b5 100644
--- a/lnwallet/rpcwallet/rpcwallet.go
+++ b/lnwallet/rpcwallet/rpcwallet.go
@@ -657,7 +657,7 @@ func (r *RPCKeyRing) ComputeInputScript(tx *wire.MsgTx,
 func (r *RPCKeyRing) MuSig2CreateSession(bipVersion input.MuSig2Version,
 	keyLoc keychain.KeyLocator, pubKeys []*btcec.PublicKey,
 	tweaks *input.MuSig2Tweaks, otherNonces [][musig2.PubNonceSize]byte,
-	_ ...musig2.SessionOption) (*input.MuSig2SessionInfo, error) {
+	localNonces *musig2.Nonces) (*input.MuSig2SessionInfo, error) {
 
 	apiVersion, err := signrpc.MarshalMuSig2Version(bipVersion)
 	if err != nil {
diff --git a/watchtower/wtmock/signer.go b/watchtower/wtmock/signer.go
index 8b80564937..1cf1f56646 100644
--- a/watchtower/wtmock/signer.go
+++ b/watchtower/wtmock/signer.go
@@ -72,7 +72,7 @@ func (s *MockSigner) ComputeInputScript(tx *wire.MsgTx,
 func (s *MockSigner) MuSig2CreateSession(input.MuSig2Version,
 	keychain.KeyLocator, []*btcec.PublicKey, *input.MuSig2Tweaks,
 	[][musig2.PubNonceSize]byte,
-	...musig2.SessionOption) (*input.MuSig2SessionInfo, error) {
+	*musig2.Nonces) (*input.MuSig2SessionInfo, error) {
 
 	return nil, nil
 }

From 8405590152436511ded2b3db7ab04dff2a8a574c Mon Sep 17 00:00:00 2001
From: Olaoluwa Osuntokun <laolu32@gmail.com>
Date: Fri, 15 Sep 2023 17:53:03 -0700
Subject: [PATCH 2/3] lnrpc/signrpc+lnwallet/rpcwallet: expose local nonces
 over RPC

In this commit, we update the set of protos to accept the local secret
nonces over RPC. This is actually a 97 byte value, as it includes the
two 32 byte nonces, as well as the 33 byte value of the public key of
the signer.

This is needed in order to be able to open taproot channels over the RPC
interface.
---
 docs/release-notes/release-notes-0.17.0.md |   7 +
 lnrpc/signrpc/signer.pb.go                 | 285 +++++++++++----------
 lnrpc/signrpc/signer.proto                 |  12 +-
 lnrpc/signrpc/signer.swagger.json          |   5 +
 lnrpc/signrpc/signer_server.go             |  56 ++++
 lnwallet/rpcwallet/rpcwallet.go            |   6 +-
 6 files changed, 234 insertions(+), 137 deletions(-)

diff --git a/docs/release-notes/release-notes-0.17.0.md b/docs/release-notes/release-notes-0.17.0.md
index 3f4cf7ceba..4e0b89e094 100644
--- a/docs/release-notes/release-notes-0.17.0.md
+++ b/docs/release-notes/release-notes-0.17.0.md
@@ -244,6 +244,13 @@ None
 * Add [`--unused`](https://github.com/lightningnetwork/lnd/pull/6387) to
   `lncli newaddr` command.
 
+* [The `MuSig2SessionRequest` proto message now contains a field to allow a
+  caller to specify a custom signing
+  nonce](https://github.com/lightningnetwork/lnd/pull/7994). This can be useful
+  for protocol where an external nonces must be pre-generated before the full
+  session can be completed.
+
+
 ## Code Health
 * Updated [our fork for serializing protobuf as JSON to be based on the
   latest version of `google.golang.org/protobuf` instead of the deprecated
diff --git a/lnrpc/signrpc/signer.pb.go b/lnrpc/signrpc/signer.pb.go
index 5a72414851..08980f264e 100644
--- a/lnrpc/signrpc/signer.pb.go
+++ b/lnrpc/signrpc/signer.pb.go
@@ -1383,6 +1383,13 @@ type MuSig2SessionRequest struct {
 	// experimental RPC was already released. Some of those changes affect how the
 	// combined key and nonces are created.
 	Version MuSig2Version `protobuf:"varint,6,opt,name=version,proto3,enum=signrpc.MuSig2Version" json:"version,omitempty"`
+	// A set of pre generated secret local nonces to use in the musig2 session.
+	// This field is optional. This can be useful for protocols that need to send
+	// nonces ahead of time before the set of signer keys are known. This value
+	// MUST be 97 bytes and be the concatenation of two CSPRNG generated 32 byte
+	// values and local public key used for signing as specified in the key_loc
+	// field.
+	PregeneratedLocalNonce []byte `protobuf:"bytes,7,opt,name=pregenerated_local_nonce,json=pregeneratedLocalNonce,proto3" json:"pregenerated_local_nonce,omitempty"`
 }
 
 func (x *MuSig2SessionRequest) Reset() {
@@ -1459,6 +1466,13 @@ func (x *MuSig2SessionRequest) GetVersion() MuSig2Version {
 	return MuSig2Version_MUSIG2_VERSION_UNDEFINED
 }
 
+func (x *MuSig2SessionRequest) GetPregeneratedLocalNonce() []byte {
+	if x != nil {
+		return x.PregeneratedLocalNonce
+	}
+	return nil
+}
+
 type MuSig2SessionResponse struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -2128,7 +2142,7 @@ var file_signrpc_signer_proto_rawDesc = []byte{
 	0x0a, 0x07, 0x76, 0x65, 0x72, 0x73, 0x69, 0x6f, 0x6e, 0x18, 0x04, 0x20, 0x01, 0x28, 0x0e, 0x32,
 	0x16, 0x2e, 0x73, 0x69, 0x67, 0x6e, 0x72, 0x70, 0x63, 0x2e, 0x4d, 0x75, 0x53, 0x69, 0x67, 0x32,
 	0x56, 0x65, 0x72, 0x73, 0x69, 0x6f, 0x6e, 0x52, 0x07, 0x76, 0x65, 0x72, 0x73, 0x69, 0x6f, 0x6e,
-	0x22, 0xcd, 0x02, 0x0a, 0x14, 0x4d, 0x75, 0x53, 0x69, 0x67, 0x32, 0x53, 0x65, 0x73, 0x73, 0x69,
+	0x22, 0x87, 0x03, 0x0a, 0x14, 0x4d, 0x75, 0x53, 0x69, 0x67, 0x32, 0x53, 0x65, 0x73, 0x73, 0x69,
 	0x6f, 0x6e, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x12, 0x2c, 0x0a, 0x07, 0x6b, 0x65, 0x79,
 	0x5f, 0x6c, 0x6f, 0x63, 0x18, 0x01, 0x20, 0x01, 0x28, 0x0b, 0x32, 0x13, 0x2e, 0x73, 0x69, 0x67,
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@@ -2149,142 +2163,145 @@ var file_signrpc_signer_proto_rawDesc = []byte{
 	0x0a, 0x07, 0x76, 0x65, 0x72, 0x73, 0x69, 0x6f, 0x6e, 0x18, 0x06, 0x20, 0x01, 0x28, 0x0e, 0x32,
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+	0x73, 0x74, 0x1a, 0x1e, 0x2e, 0x73, 0x69, 0x67, 0x6e, 0x72, 0x70, 0x63, 0x2e, 0x4d, 0x75, 0x53,
+	0x69, 0x67, 0x32, 0x43, 0x6c, 0x65, 0x61, 0x6e, 0x75, 0x70, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e,
+	0x73, 0x65, 0x42, 0x2f, 0x5a, 0x2d, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d,
+	0x2f, 0x6c, 0x69, 0x67, 0x68, 0x74, 0x6e, 0x69, 0x6e, 0x67, 0x6e, 0x65, 0x74, 0x77, 0x6f, 0x72,
+	0x6b, 0x2f, 0x6c, 0x6e, 0x64, 0x2f, 0x6c, 0x6e, 0x72, 0x70, 0x63, 0x2f, 0x73, 0x69, 0x67, 0x6e,
+	0x72, 0x70, 0x63, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
diff --git a/lnrpc/signrpc/signer.proto b/lnrpc/signrpc/signer.proto
index 6540252f69..f704000f96 100644
--- a/lnrpc/signrpc/signer.proto
+++ b/lnrpc/signrpc/signer.proto
@@ -558,6 +558,16 @@ message MuSig2SessionRequest {
     combined key and nonces are created.
     */
     MuSig2Version version = 6;
+
+    /*
+    A set of pre generated secret local nonces to use in the musig2 session.
+    This field is optional. This can be useful for protocols that need to send
+    nonces ahead of time before the set of signer keys are known. This value
+    MUST be 97 bytes and be the concatenation of two CSPRNG generated 32 byte
+    values and local public key used for signing as specified in the key_loc
+    field.
+    */
+    bytes pregenerated_local_nonce = 7;
 }
 
 message MuSig2SessionResponse {
@@ -684,4 +694,4 @@ message MuSig2CleanupRequest {
 }
 
 message MuSig2CleanupResponse {
-}
\ No newline at end of file
+}
diff --git a/lnrpc/signrpc/signer.swagger.json b/lnrpc/signrpc/signer.swagger.json
index d83b1df757..b1f511097d 100644
--- a/lnrpc/signrpc/signer.swagger.json
+++ b/lnrpc/signrpc/signer.swagger.json
@@ -636,6 +636,11 @@
         "version": {
           "$ref": "#/definitions/signrpcMuSig2Version",
           "description": "The mandatory version of the MuSig2 BIP draft to use. This is necessary to\ndifferentiate between the changes that were made to the BIP while this\nexperimental RPC was already released. Some of those changes affect how the\ncombined key and nonces are created."
+        },
+        "pregenerated_local_nonce": {
+          "type": "string",
+          "format": "byte",
+          "description": "A set of pre generated secret local nonces to use in the musig2 session.\nThis field is optional. This can be useful for protocols that need to send\nnonces ahead of time before the set of signer keys are known. This value\nMUST be 97 bytes and be the concatenation of two CSPRNG generated 32 byte\nvalues and local public key used for signing as specified in the key_loc\nfield."
         }
       }
     },
diff --git a/lnrpc/signrpc/signer_server.go b/lnrpc/signrpc/signer_server.go
index abbd6592c4..a8f2acf2ae 100644
--- a/lnrpc/signrpc/signer_server.go
+++ b/lnrpc/signrpc/signer_server.go
@@ -875,6 +875,41 @@ func (s *Server) MuSig2CombineKeys(_ context.Context,
 	}, nil
 }
 
+// secNonceToPubNonce takes our two secret nonces, and produces their two
+// corresponding EC points, serialized in compressed format.
+//
+// NOTE: This was copied from btcsuite/btcec/musig2/nonces.go.
+func secNonceToPubNonce(secNonce [musig2.SecNonceSize]byte,
+) [musig2.PubNonceSize]byte {
+
+	var k1Mod, k2Mod btcec.ModNScalar
+	k1Mod.SetByteSlice(secNonce[:btcec.PrivKeyBytesLen])
+	k2Mod.SetByteSlice(secNonce[btcec.PrivKeyBytesLen:])
+
+	var r1, r2 btcec.JacobianPoint
+	btcec.ScalarBaseMultNonConst(&k1Mod, &r1)
+	btcec.ScalarBaseMultNonConst(&k2Mod, &r2)
+
+	// Next, we'll convert the key in jacobian format to a normal public
+	// key expressed in affine coordinates.
+	r1.ToAffine()
+	r2.ToAffine()
+	r1Pub := btcec.NewPublicKey(&r1.X, &r1.Y)
+	r2Pub := btcec.NewPublicKey(&r2.X, &r2.Y)
+
+	var pubNonce [musig2.PubNonceSize]byte
+
+	// The public nonces are serialized as: R1 || R2, where both keys are
+	// serialized in compressed format.
+	copy(pubNonce[:], r1Pub.SerializeCompressed())
+	copy(
+		pubNonce[btcec.PubKeyBytesLenCompressed:],
+		r2Pub.SerializeCompressed(),
+	)
+
+	return pubNonce
+}
+
 // MuSig2CreateSession creates a new MuSig2 signing session using the local
 // key identified by the key locator. The complete list of all public keys of
 // all signing parties must be provided, including the public key of the local
@@ -921,6 +956,26 @@ func (s *Server) MuSig2CreateSession(_ context.Context,
 			len(in.OtherSignerPublicNonces), maxNonces)
 	}
 
+	var localNonces *musig2.Nonces
+
+	// If the pre generated local nonces were specified, then check to make
+	// sure they're the correct size and format.
+	nonceLen := len(in.PregeneratedLocalNonce)
+	switch {
+	case nonceLen != 0 && nonceLen != musig2.SecNonceSize:
+		return nil, fmt.Errorf("local nonces must be %v bytes, "+
+			"instead was %v", musig2.SecNonceSize, nonceLen)
+
+	case nonceLen == musig2.SecNonceSize:
+		var secNonce [musig2.SecNonceSize]byte
+		copy(secNonce[:], in.PregeneratedLocalNonce)
+
+		localNonces = &musig2.Nonces{
+			SecNonce: secNonce,
+			PubNonce: secNonceToPubNonce(secNonce),
+		}
+	}
+
 	// Parse all other nonces we might already know.
 	otherSignerNonces, err := parseMuSig2PublicNonces(
 		in.OtherSignerPublicNonces, true,
@@ -939,6 +994,7 @@ func (s *Server) MuSig2CreateSession(_ context.Context,
 	// Register the session with the internal wallet/signer now.
 	session, err := s.cfg.Signer.MuSig2CreateSession(
 		version, keyLoc, allSignerPubKeys, tweaks, otherSignerNonces,
+		localNonces,
 	)
 	if err != nil {
 		return nil, fmt.Errorf("error registering session: %v", err)
diff --git a/lnwallet/rpcwallet/rpcwallet.go b/lnwallet/rpcwallet/rpcwallet.go
index d805ed45b5..69e1f25b76 100644
--- a/lnwallet/rpcwallet/rpcwallet.go
+++ b/lnwallet/rpcwallet/rpcwallet.go
@@ -664,8 +664,6 @@ func (r *RPCKeyRing) MuSig2CreateSession(bipVersion input.MuSig2Version,
 		return nil, err
 	}
 
-	// TODO(roasbeef): add protos to specify session options
-
 	// We need to serialize all data for the RPC call. We can do that by
 	// putting everything directly into the request struct.
 	req := &signrpc.MuSig2SessionRequest{
@@ -708,6 +706,10 @@ func (r *RPCKeyRing) MuSig2CreateSession(bipVersion input.MuSig2Version,
 		}
 	}
 
+	if localNonces != nil {
+		req.PregeneratedLocalNonce = localNonces.SecNonce[:]
+	}
+
 	ctxt, cancel := context.WithTimeout(context.Background(), r.rpcTimeout)
 	defer cancel()
 

From 6c3a55d89c2068fe9fdf3ea98c6b59daad212a33 Mon Sep 17 00:00:00 2001
From: Olaoluwa Osuntokun <laolu32@gmail.com>
Date: Fri, 15 Sep 2023 18:23:11 -0700
Subject: [PATCH 3/3] itest: add remote signer test case for taproot chans

This ensures that taproot chans can be used with the remote signer
configuration.
---
 itest/lnd_payment_test.go       | 23 +++++++++++++++++++----
 itest/lnd_remote_signer_test.go | 28 ++++++++++++++++++++++++----
 2 files changed, 43 insertions(+), 8 deletions(-)

diff --git a/itest/lnd_payment_test.go b/itest/lnd_payment_test.go
index 631399326e..610d35d597 100644
--- a/itest/lnd_payment_test.go
+++ b/itest/lnd_payment_test.go
@@ -233,19 +233,34 @@ func testAsyncPayments(ht *lntest.HarnessTest) {
 	ht.EnsureConnected(alice, bob)
 	ht.FundCoins(btcutil.SatoshiPerBitcoin, alice)
 
-	runAsyncPayments(ht, alice, bob)
+	runAsyncPayments(ht, alice, bob, nil)
 }
 
 // runAsyncPayments tests the performance of the async payments.
-func runAsyncPayments(ht *lntest.HarnessTest, alice, bob *node.HarnessNode) {
+func runAsyncPayments(ht *lntest.HarnessTest, alice, bob *node.HarnessNode,
+	commitType *lnrpc.CommitmentType) {
+
 	const paymentAmt = 100
 
+	channelCapacity := btcutil.Amount(paymentAmt * 2000)
+
+	chanArgs := lntest.OpenChannelParams{
+		Amt: channelCapacity,
+	}
+
+	if commitType != nil {
+		chanArgs.CommitmentType = *commitType
+
+		if *commitType == lnrpc.CommitmentType_SIMPLE_TAPROOT {
+			chanArgs.Private = true
+		}
+	}
+
 	// First establish a channel with a capacity equals to the overall
 	// amount of payments, between Alice and Bob, at the end of the test
 	// Alice should send all money from her side to Bob.
-	channelCapacity := btcutil.Amount(paymentAmt * 2000)
 	chanPoint := ht.OpenChannel(
-		alice, bob, lntest.OpenChannelParams{Amt: channelCapacity},
+		alice, bob, chanArgs,
 	)
 
 	info := ht.QueryChannelByChanPoint(alice, chanPoint)
diff --git a/itest/lnd_remote_signer_test.go b/itest/lnd_remote_signer_test.go
index c3cd260c5c..b9c96bb008 100644
--- a/itest/lnd_remote_signer_test.go
+++ b/itest/lnd_remote_signer_test.go
@@ -60,6 +60,7 @@ func testRemoteSigner(ht *lntest.HarnessTest) {
 		name       string
 		randomSeed bool
 		sendCoins  bool
+		commitType lnrpc.CommitmentType
 		fn         func(tt *lntest.HarnessTest,
 			wo, carol *node.HarnessNode)
 	}
@@ -94,8 +95,19 @@ func testRemoteSigner(ht *lntest.HarnessTest) {
 		name:      "async payments",
 		sendCoins: true,
 		fn: func(tt *lntest.HarnessTest, wo, carol *node.HarnessNode) {
-			runAsyncPayments(tt, wo, carol)
+			runAsyncPayments(tt, wo, carol, nil)
 		},
+	}, {
+		name:      "async payments taproot",
+		sendCoins: true,
+		fn: func(tt *lntest.HarnessTest, wo, carol *node.HarnessNode) {
+			commitType := lnrpc.CommitmentType_SIMPLE_TAPROOT
+
+			runAsyncPayments(
+				tt, wo, carol, &commitType,
+			)
+		},
+		commitType: lnrpc.CommitmentType_SIMPLE_TAPROOT,
 	}, {
 		name: "shared key",
 		fn: func(tt *lntest.HarnessTest, wo, carol *node.HarnessNode) {
@@ -199,11 +211,18 @@ func testRemoteSigner(ht *lntest.HarnessTest) {
 			require.NoError(st, err)
 		}
 
+		var commitArgs []string
+		if subTest.commitType == lnrpc.CommitmentType_SIMPLE_TAPROOT {
+			commitArgs = lntest.NodeArgsForCommitType(
+				subTest.commitType,
+			)
+		}
+
 		// WatchOnly is the node that has a watch-only wallet and uses
 		// the Signer node for any operation that requires access to
 		// private keys.
 		watchOnly := st.NewNodeRemoteSigner(
-			"WatchOnly", []string{
+			"WatchOnly", append([]string{
 				"--remotesigner.enable",
 				fmt.Sprintf(
 					"--remotesigner.rpchost=localhost:%d",
@@ -217,7 +236,8 @@ func testRemoteSigner(ht *lntest.HarnessTest) {
 					"--remotesigner.macaroonpath=%s",
 					signer.Cfg.AdminMacPath,
 				),
-			}, password, &lnrpc.WatchOnly{
+			}, commitArgs...),
+			password, &lnrpc.WatchOnly{
 				MasterKeyBirthdayTimestamp: 0,
 				MasterKeyFingerprint:       nil,
 				Accounts:                   watchOnlyAccounts,
@@ -235,7 +255,7 @@ func testRemoteSigner(ht *lntest.HarnessTest) {
 			)
 		}
 
-		carol := st.NewNode("carol", nil)
+		carol := st.NewNode("carol", commitArgs)
 		st.EnsureConnected(watchOnly, carol)
 
 		return signer, watchOnly, carol