diff --git a/client_test.go b/client_test.go
index 8539a88..a6297dd 100644
--- a/client_test.go
+++ b/client_test.go
@@ -13,7 +13,6 @@ import (
 	"github.com/lightninglabs/loop/loopdb"
 	"github.com/lightninglabs/loop/swap"
 	"github.com/lightninglabs/loop/test"
-	"github.com/lightningnetwork/lnd/input"
 	"github.com/lightningnetwork/lnd/lnrpc"
 	"github.com/lightningnetwork/lnd/lntypes"
 	"github.com/stretchr/testify/require"
@@ -240,8 +239,12 @@ func testLoopOutResume(t *testing.T, confs uint32, expired, preimageRevealed,
 				Preimage:        preimage,
 				AmountRequested: amt,
 				CltvExpiry:      744,
-				ReceiverKey:     receiverKey,
-				SenderKey:       senderKey,
+				HtlcKeys: loopdb.HtlcKeys{
+					SenderScriptKey:        senderKey,
+					SenderInternalPubKey:   senderKey,
+					ReceiverScriptKey:      receiverKey,
+					ReceiverInternalPubKey: receiverKey,
+				},
 				MaxSwapFee:      60000,
 				MaxMinerFee:     50000,
 				ProtocolVersion: protocolVersion,
@@ -273,30 +276,13 @@ func testLoopOutResume(t *testing.T, confs uint32, expired, preimageRevealed,
 	// Expect client to register for our expected number of confirmations.
 	confIntent := ctx.AssertRegisterConf(preimageRevealed, int32(confs))
 
-	// Assert that the loopout htlc equals to the expected one.
-	scriptVersion := GetHtlcScriptVersion(protocolVersion)
-	var htlc *swap.Htlc
-
-	switch scriptVersion {
-	case swap.HtlcV2:
-		htlc, err = swap.NewHtlcV2(
-			pendingSwap.Contract.CltvExpiry, senderKey,
-			receiverKey, hash, &chaincfg.TestNet3Params,
-		)
-
-	case swap.HtlcV3:
-		htlc, err = swap.NewHtlcV3(
-			input.MuSig2Version040,
-			pendingSwap.Contract.CltvExpiry, senderKey,
-			receiverKey, senderKey, receiverKey, hash,
-			&chaincfg.TestNet3Params,
-		)
-
-	default:
-		t.Fatalf(swap.ErrInvalidScriptVersion.Error())
-	}
-
+	htlc, err := GetHtlc(
+		hash, &pendingSwap.Contract.SwapContract,
+		&chaincfg.TestNet3Params,
+	)
 	require.NoError(t, err)
+
+	// Assert that the loopout htlc equals to the expected one.
 	require.Equal(t, htlc.PkScript, confIntent.PkScript)
 
 	signalSwapPaymentResult(nil)
@@ -315,7 +301,7 @@ func testLoopOutResume(t *testing.T, confs uint32, expired, preimageRevealed,
 		func(r error) {},
 		func(r error) {},
 		preimageRevealed,
-		confIntent, scriptVersion,
+		confIntent, GetHtlcScriptVersion(protocolVersion),
 	)
 }
 
diff --git a/loopdb/loop.go b/loopdb/loop.go
index e98745f..867476b 100644
--- a/loopdb/loop.go
+++ b/loopdb/loop.go
@@ -10,6 +10,31 @@ import (
 	"github.com/lightningnetwork/lnd/lntypes"
 )
 
+// HtlcKeys is a holder of all keys used when constructing the swap HTLC. Since
+// it's used for both loop in and loop out swaps it may hold partial information
+// about the sender or receiver depending on the swap type.
+type HtlcKeys struct {
+	// SenderScriptKey is the sender's public key that is used in the HTLC,
+	// specifically when constructing the script spend scripts.
+	SenderScriptKey [33]byte
+
+	// SenderInternalPubKey is the sender's internal pubkey that is used in
+	// taproot HTLCs as part of the aggregate internal key.
+	SenderInternalPubKey [33]byte
+
+	// ReceiverScriptKey is the receiver's public key that is used in the
+	// HTLC, specifically when constructing the script spend scripts.
+	ReceiverScriptKey [33]byte
+
+	// ReceiverInternalPubKey is the sender's internal pubkey that is used
+	// in taproot HTLCs as part of the aggregate internal key.
+	ReceiverInternalPubKey [33]byte
+
+	// ClientScriptKeyLocator is the client's key locator for the key used
+	// in the HTLC script spend scripts.
+	ClientScriptKeyLocator keychain.KeyLocator
+}
+
 // SwapContract contains the base data that is serialized to persistent storage
 // for pending swaps.
 type SwapContract struct {
@@ -19,18 +44,8 @@ type SwapContract struct {
 	// AmountRequested is the total amount of the swap.
 	AmountRequested btcutil.Amount
 
-	// SenderKey is the key of the sender that will be used in the on-chain
-	// HTLC.
-	SenderKey [33]byte
-
-	// ReceiverKey is the of the receiver that will be used in the on-chain
-	// HTLC.
-	ReceiverKey [33]byte
-
-	// ClientKeyLocator is the key locator (family and index) for the client
-	// key. It is for the receiver key if this is a loop out contract, or
-	// the sender key if this is a loop in contract.
-	ClientKeyLocator keychain.KeyLocator
+	// HtlcKeys holds all keys used in the swap HTLC construction.
+	HtlcKeys HtlcKeys
 
 	// CltvExpiry is the total absolute CLTV expiry of the swap.
 	CltvExpiry int32
diff --git a/loopdb/loopin.go b/loopdb/loopin.go
index 7a665e2..e10e898 100644
--- a/loopdb/loopin.go
+++ b/loopdb/loopin.go
@@ -63,7 +63,7 @@ func serializeLoopInContract(swap *LoopInContract) (
 		return nil, err
 	}
 
-	n, err := b.Write(swap.SenderKey[:])
+	n, err := b.Write(swap.HtlcKeys.SenderScriptKey[:])
 	if err != nil {
 		return nil, err
 	}
@@ -71,7 +71,7 @@ func serializeLoopInContract(swap *LoopInContract) (
 		return nil, fmt.Errorf("sender key has invalid length")
 	}
 
-	n, err = b.Write(swap.ReceiverKey[:])
+	n, err = b.Write(swap.HtlcKeys.ReceiverScriptKey[:])
 	if err != nil {
 		return nil, err
 	}
@@ -161,7 +161,7 @@ func deserializeLoopInContract(value []byte) (*LoopInContract, error) {
 		return nil, err
 	}
 
-	n, err := r.Read(contract.SenderKey[:])
+	n, err := r.Read(contract.HtlcKeys.SenderScriptKey[:])
 	if err != nil {
 		return nil, err
 	}
@@ -169,7 +169,7 @@ func deserializeLoopInContract(value []byte) (*LoopInContract, error) {
 		return nil, fmt.Errorf("sender key has invalid length")
 	}
 
-	n, err = r.Read(contract.ReceiverKey[:])
+	n, err = r.Read(contract.HtlcKeys.ReceiverScriptKey[:])
 	if err != nil {
 		return nil, err
 	}
diff --git a/loopdb/loopout.go b/loopdb/loopout.go
index ad628a9..9ebb858 100644
--- a/loopdb/loopout.go
+++ b/loopdb/loopout.go
@@ -134,7 +134,7 @@ func deserializeLoopOutContract(value []byte, chainParams *chaincfg.Params) (
 		return nil, err
 	}
 
-	n, err := r.Read(contract.SenderKey[:])
+	n, err := r.Read(contract.HtlcKeys.SenderScriptKey[:])
 	if err != nil {
 		return nil, err
 	}
@@ -142,7 +142,7 @@ func deserializeLoopOutContract(value []byte, chainParams *chaincfg.Params) (
 		return nil, fmt.Errorf("sender key has invalid length")
 	}
 
-	n, err = r.Read(contract.ReceiverKey[:])
+	n, err = r.Read(contract.HtlcKeys.ReceiverScriptKey[:])
 	if err != nil {
 		return nil, err
 	}
@@ -229,7 +229,7 @@ func serializeLoopOutContract(swap *LoopOutContract) (
 		return nil, err
 	}
 
-	n, err := b.Write(swap.SenderKey[:])
+	n, err := b.Write(swap.HtlcKeys.SenderScriptKey[:])
 	if err != nil {
 		return nil, err
 	}
@@ -237,7 +237,7 @@ func serializeLoopOutContract(swap *LoopOutContract) (
 		return nil, fmt.Errorf("sender key has invalid length")
 	}
 
-	n, err = b.Write(swap.ReceiverKey[:])
+	n, err = b.Write(swap.HtlcKeys.ReceiverScriptKey[:])
 	if err != nil {
 		return nil, err
 	}
diff --git a/loopdb/protocol_version.go b/loopdb/protocol_version.go
index 06e0e32..a9fdee8 100644
--- a/loopdb/protocol_version.go
+++ b/loopdb/protocol_version.go
@@ -55,6 +55,9 @@ const (
 	// HTLC v3 (P2TR) script for swaps.
 	ProtocolVersionHtlcV3 = 10
 
+	// ProtocolVersionMuSig2 will enable MuSig2 signature scheme for loops.
+	ProtocolVersionMuSig2 ProtocolVersion = 11
+
 	// ProtocolVersionUnrecorded is set for swaps were created before we
 	// started saving protocol version with swaps.
 	ProtocolVersionUnrecorded ProtocolVersion = math.MaxUint32
@@ -65,7 +68,7 @@ const (
 
 	// experimentalRPCProtocolVersion defines the RPC protocol version that
 	// includes all currently experimentally released features.
-	experimentalRPCProtocolVersion = looprpc.ProtocolVersion_HTLC_V3
+	experimentalRPCProtocolVersion = looprpc.ProtocolVersion_MUSIG2
 )
 
 var (
@@ -141,6 +144,9 @@ func (p ProtocolVersion) String() string {
 	case ProtocolVersionHtlcV3:
 		return "HTLC V3"
 
+	case ProtocolVersionMuSig2:
+		return "MuSig2"
+
 	default:
 		return "Unknown"
 	}
diff --git a/loopdb/store.go b/loopdb/store.go
index b86008d..63b4be4 100644
--- a/loopdb/store.go
+++ b/loopdb/store.go
@@ -112,9 +112,30 @@ var (
 	// value: concatenation of uint32 values [family, index].
 	keyLocatorKey = []byte("keylocator")
 
+	// senderInternalPubKeyKey is the key that stores the sender's internal
+	// public key which used when constructing the swap HTLC.
+	//
+	// path: loopInBucket/loopOutBucket -> swapBucket[hash]
+	//                                      -> senderInternalPubKeyKey
+	// value: serialized public key.
+	senderInternalPubKeyKey = []byte("sender-internal-pubkey")
+
+	// receiverInternalPubKeyKey is the key that stores the receiver's
+	// internal public key which is used when constructing the swap HTLC.
+	//
+	// path: loopInBucket/loopOutBucket -> swapBucket[hash]
+	//                                     -> receiverInternalPubKeyKey
+	// value: serialized public key.
+	receiverInternalPubKeyKey = []byte("receiver-internal-pubkey")
+
 	byteOrder = binary.BigEndian
 
+	// keyLength is the length of a serialized public key.
 	keyLength = 33
+
+	// errInvalidKey is returned when a serialized key is not the expected
+	// length.
+	errInvalidKey = fmt.Errorf("invalid serialized key")
 )
 
 const (
@@ -233,6 +254,95 @@ func NewBoltSwapStore(dbPath string, chainParams *chaincfg.Params) (
 	}, nil
 }
 
+// marshalHtlcKeys marshals the HTLC keys of the swap contract into the swap
+// bucket.
+func marshalHtlcKeys(swapBucket *bbolt.Bucket, contract *SwapContract) error {
+	var err error
+
+	// Store the key locator for swaps that use taproot HTLCs.
+	if contract.ProtocolVersion >= ProtocolVersionHtlcV3 {
+		keyLocator, err := MarshalKeyLocator(
+			contract.HtlcKeys.ClientScriptKeyLocator,
+		)
+		if err != nil {
+			return err
+		}
+
+		err = swapBucket.Put(keyLocatorKey, keyLocator)
+		if err != nil {
+			return err
+		}
+	}
+
+	// Store the internal keys for MuSig2 swaps.
+	if contract.ProtocolVersion >= ProtocolVersionMuSig2 {
+		// Internal pubkeys are always filled.
+		err = swapBucket.Put(
+			senderInternalPubKeyKey,
+			contract.HtlcKeys.SenderInternalPubKey[:],
+		)
+		if err != nil {
+			return err
+		}
+
+		err = swapBucket.Put(
+			receiverInternalPubKeyKey,
+			contract.HtlcKeys.ReceiverInternalPubKey[:],
+		)
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+// unmarshalHtlcKeys deserializes the htlc keys from the swap bucket.
+func unmarshalHtlcKeys(swapBucket *bbolt.Bucket, contract *SwapContract) error {
+	var err error
+
+	// HTLC V3 contracts have the client script key locator stored.
+	if contract.ProtocolVersion >= ProtocolVersionHtlcV3 &&
+		ProtocolVersionUnrecorded > contract.ProtocolVersion {
+
+		contract.HtlcKeys.ClientScriptKeyLocator, err =
+			UnmarshalKeyLocator(
+				swapBucket.Get(keyLocatorKey),
+			)
+		if err != nil {
+			return err
+		}
+
+		// Default the internal scriptkeys to the sender and receiver
+		// keys.
+		contract.HtlcKeys.SenderInternalPubKey =
+			contract.HtlcKeys.SenderScriptKey
+		contract.HtlcKeys.ReceiverInternalPubKey =
+			contract.HtlcKeys.ReceiverScriptKey
+	}
+
+	// MuSig2 contracts have the internal keys stored too.
+	if contract.ProtocolVersion >= ProtocolVersionMuSig2 &&
+		ProtocolVersionUnrecorded > contract.ProtocolVersion {
+
+		// The pubkeys used for the joint HTLC internal key are always
+		// present.
+		key := swapBucket.Get(senderInternalPubKeyKey)
+		if len(key) != keyLength {
+			return errInvalidKey
+		}
+		copy(contract.HtlcKeys.SenderInternalPubKey[:], key)
+
+		key = swapBucket.Get(receiverInternalPubKeyKey)
+		if len(key) != keyLength {
+			return errInvalidKey
+		}
+		copy(contract.HtlcKeys.ReceiverInternalPubKey[:], key)
+	}
+
+	return nil
+}
+
 // FetchLoopOutSwaps returns all loop out swaps currently in the store.
 //
 // NOTE: Part of the loopdb.SwapStore interface.
@@ -435,19 +545,10 @@ func (s *boltSwapStore) CreateLoopOut(hash lntypes.Hash,
 			return err
 		}
 
-		// Store the key locator for swaps with taproot htlc.
-		if swap.ProtocolVersion >= ProtocolVersionHtlcV3 {
-			keyLocator, err := MarshalKeyLocator(
-				swap.ClientKeyLocator,
-			)
-			if err != nil {
-				return err
-			}
-
-			err = swapBucket.Put(keyLocatorKey, keyLocator)
-			if err != nil {
-				return err
-			}
+		// Store the htlc keys and server key locator.
+		err = marshalHtlcKeys(swapBucket, &swap.SwapContract)
+		if err != nil {
+			return err
 		}
 
 		// Finally, we'll create an empty updates bucket for this swap
@@ -501,19 +602,10 @@ func (s *boltSwapStore) CreateLoopIn(hash lntypes.Hash,
 			return err
 		}
 
-		// Store the key locator for swaps with taproot htlc.
-		if swap.ProtocolVersion >= ProtocolVersionHtlcV3 {
-			keyLocator, err := MarshalKeyLocator(
-				swap.ClientKeyLocator,
-			)
-			if err != nil {
-				return err
-			}
-
-			err = swapBucket.Put(keyLocatorKey, keyLocator)
-			if err != nil {
-				return err
-			}
+		// Store the htlc keys and server key locator.
+		err = marshalHtlcKeys(swapBucket, &swap.SwapContract)
+		if err != nil {
+			return err
 		}
 
 		// Finally, we'll create an empty updates bucket for this swap
@@ -788,14 +880,12 @@ func (s *boltSwapStore) fetchLoopOutSwap(rootBucket *bbolt.Bucket,
 		return nil, err
 	}
 
-	// Try to unmarshal the key locator.
-	if contract.ProtocolVersion >= ProtocolVersionHtlcV3 {
-		contract.ClientKeyLocator, err = UnmarshalKeyLocator(
-			swapBucket.Get(keyLocatorKey),
-		)
-		if err != nil {
-			return nil, err
-		}
+	// Unmarshal HTLC keys if the contract is recent.
+	err = unmarshalHtlcKeys(
+		swapBucket, &contract.SwapContract,
+	)
+	if err != nil {
+		return nil, err
 	}
 
 	loop := LoopOut{
@@ -865,14 +955,12 @@ func (s *boltSwapStore) fetchLoopInSwap(rootBucket *bbolt.Bucket,
 		return nil, err
 	}
 
-	// Try to unmarshal the key locator.
-	if contract.ProtocolVersion >= ProtocolVersionHtlcV3 {
-		contract.ClientKeyLocator, err = UnmarshalKeyLocator(
-			swapBucket.Get(keyLocatorKey),
-		)
-		if err != nil {
-			return nil, err
-		}
+	// Unmarshal HTLC keys if the contract is recent.
+	err = unmarshalHtlcKeys(
+		swapBucket, &contract.SwapContract,
+	)
+	if err != nil {
+		return nil, err
 	}
 
 	loop := LoopIn{
diff --git a/loopdb/store_test.go b/loopdb/store_test.go
index 8d2602c..324e965 100644
--- a/loopdb/store_test.go
+++ b/loopdb/store_test.go
@@ -12,6 +12,7 @@ import (
 	"github.com/btcsuite/btcd/chaincfg/chainhash"
 	"github.com/coreos/bbolt"
 	"github.com/lightninglabs/loop/test"
+	"github.com/lightningnetwork/lnd/keychain"
 	"github.com/lightningnetwork/lnd/lntypes"
 	"github.com/lightningnetwork/lnd/routing/route"
 	"github.com/stretchr/testify/require"
@@ -28,6 +29,16 @@ var (
 		1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3,
 	}
 
+	senderInternalKey = [33]byte{
+		1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+		1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 4,
+	}
+
+	receiverInternalKey = [33]byte{
+		1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+		1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 5,
+	}
+
 	testPreimage = lntypes.Preimage([32]byte{
 		1, 1, 1, 1, 2, 2, 2, 2,
 		3, 3, 3, 3, 4, 4, 4, 4,
@@ -51,9 +62,16 @@ func TestLoopOutStore(t *testing.T) {
 			AmountRequested: 100,
 			Preimage:        testPreimage,
 			CltvExpiry:      144,
-			SenderKey:       senderKey,
-
-			ReceiverKey: receiverKey,
+			HtlcKeys: HtlcKeys{
+				SenderScriptKey:        senderKey,
+				ReceiverScriptKey:      receiverKey,
+				SenderInternalPubKey:   senderInternalKey,
+				ReceiverInternalPubKey: receiverInternalKey,
+				ClientScriptKeyLocator: keychain.KeyLocator{
+					Family: 1,
+					Index:  2,
+				},
+			},
 			MaxMinerFee: 10,
 			MaxSwapFee:  20,
 
@@ -61,7 +79,8 @@ func TestLoopOutStore(t *testing.T) {
 
 			// Convert to/from unix to remove timezone, so that it
 			// doesn't interfere with DeepEqual.
-			InitiationTime: time.Unix(0, initiationTime.UnixNano()),
+			InitiationTime:  time.Unix(0, initiationTime.UnixNano()),
+			ProtocolVersion: ProtocolVersionMuSig2,
 		},
 		MaxPrepayRoutingFee:     40,
 		PrepayInvoice:           "prepayinvoice",
@@ -195,18 +214,27 @@ func TestLoopInStore(t *testing.T) {
 
 	pendingSwap := LoopInContract{
 		SwapContract: SwapContract{
-			AmountRequested:  100,
-			Preimage:         testPreimage,
-			CltvExpiry:       144,
-			SenderKey:        senderKey,
-			ReceiverKey:      receiverKey,
+			AmountRequested: 100,
+			Preimage:        testPreimage,
+			CltvExpiry:      144,
+			HtlcKeys: HtlcKeys{
+				SenderScriptKey:        senderKey,
+				ReceiverScriptKey:      receiverKey,
+				SenderInternalPubKey:   senderInternalKey,
+				ReceiverInternalPubKey: receiverInternalKey,
+				ClientScriptKeyLocator: keychain.KeyLocator{
+					Family: 1,
+					Index:  2,
+				},
+			},
 			MaxMinerFee:      10,
 			MaxSwapFee:       20,
 			InitiationHeight: 99,
 
 			// Convert to/from unix to remove timezone, so that it
 			// doesn't interfere with DeepEqual.
-			InitiationTime: time.Unix(0, initiationTime.UnixNano()),
+			InitiationTime:  time.Unix(0, initiationTime.UnixNano()),
+			ProtocolVersion: ProtocolVersionMuSig2,
 		},
 		HtlcConfTarget: 2,
 		LastHop:        &lastHop,
diff --git a/loopin.go b/loopin.go
index ae0c697..d755122 100644
--- a/loopin.go
+++ b/loopin.go
@@ -9,6 +9,7 @@ import (
 	"sync"
 	"time"
 
+	"github.com/btcsuite/btcd/btcec/v2"
 	"github.com/btcsuite/btcd/btcutil"
 	"github.com/btcsuite/btcd/chaincfg/chainhash"
 	"github.com/btcsuite/btcd/mempool"
@@ -19,6 +20,7 @@ import (
 	"github.com/lightninglabs/loop/swap"
 	"github.com/lightningnetwork/lnd/chainntnfs"
 	invpkg "github.com/lightningnetwork/lnd/invoices"
+	"github.com/lightningnetwork/lnd/keychain"
 	"github.com/lightningnetwork/lnd/lnrpc/invoicesrpc"
 	"github.com/lightningnetwork/lnd/lnrpc/walletrpc"
 	"github.com/lightningnetwork/lnd/lntypes"
@@ -189,6 +191,23 @@ func newLoopInSwap(globalCtx context.Context, cfg *swapConfig,
 		return nil, err
 	}
 
+	// Default the HTLC internal key to our sender key.
+	senderInternalPubKey := senderKey
+
+	// If this is a MuSig2 swap then we'll generate a brand new key pair
+	// and will use that as the internal key for the HTLC.
+	if loopdb.CurrentProtocolVersion() >= loopdb.ProtocolVersionMuSig2 {
+		secret, err := sharedSecretFromHash(
+			globalCtx, cfg.lnd.Signer, swapHash,
+		)
+		if err != nil {
+			return nil, err
+		}
+
+		_, pubKey := btcec.PrivKeyFromBytes(secret[:])
+		copy(senderInternalPubKey[:], pubKey.SerializeCompressed())
+	}
+
 	// Create a cancellable context that is used for monitoring the probe.
 	probeWaitCtx, probeWaitCancel := context.WithCancel(globalCtx)
 
@@ -204,8 +223,8 @@ func newLoopInSwap(globalCtx context.Context, cfg *swapConfig,
 	// htlc.
 	log.Infof("Initiating swap request at height %v", currentHeight)
 	swapResp, err := cfg.server.NewLoopInSwap(globalCtx, swapHash,
-		request.Amount, senderKey, swapInvoice, probeInvoice,
-		request.LastHop, request.Initiator,
+		request.Amount, senderKey, senderInternalPubKey, swapInvoice,
+		probeInvoice, request.LastHop, request.Initiator,
 	)
 	probeWaitCancel()
 	if err != nil {
@@ -237,19 +256,30 @@ func newLoopInSwap(globalCtx context.Context, cfg *swapConfig,
 		SwapContract: loopdb.SwapContract{
 			InitiationHeight: currentHeight,
 			InitiationTime:   initiationTime,
-			ReceiverKey:      swapResp.receiverKey,
-			SenderKey:        senderKey,
-			ClientKeyLocator: keyDesc.KeyLocator,
-			Preimage:         swapPreimage,
-			AmountRequested:  request.Amount,
-			CltvExpiry:       swapResp.expiry,
-			MaxMinerFee:      request.MaxMinerFee,
-			MaxSwapFee:       request.MaxSwapFee,
-			Label:            request.Label,
-			ProtocolVersion:  loopdb.CurrentProtocolVersion(),
+			HtlcKeys: loopdb.HtlcKeys{
+				SenderScriptKey:        senderKey,
+				SenderInternalPubKey:   senderKey,
+				ReceiverScriptKey:      swapResp.receiverKey,
+				ReceiverInternalPubKey: swapResp.receiverKey,
+				ClientScriptKeyLocator: keyDesc.KeyLocator,
+			},
+			Preimage:        swapPreimage,
+			AmountRequested: request.Amount,
+			CltvExpiry:      swapResp.expiry,
+			MaxMinerFee:     request.MaxMinerFee,
+			MaxSwapFee:      request.MaxSwapFee,
+			Label:           request.Label,
+			ProtocolVersion: loopdb.CurrentProtocolVersion(),
 		},
 	}
 
+	// For MuSig2 swaps we store the proper internal keys that we generated
+	// and received from the server.
+	if loopdb.CurrentProtocolVersion() >= loopdb.ProtocolVersionMuSig2 {
+		contract.HtlcKeys.SenderInternalPubKey = senderInternalPubKey
+		contract.HtlcKeys.ReceiverInternalPubKey = swapResp.receiverInternalKey
+	}
+
 	swapKit := newSwapKit(
 		swapHash, swap.TypeIn,
 		cfg, &contract.SwapContract,
@@ -809,6 +839,7 @@ func (s *loopInSwap) waitForSwapComplete(ctx context.Context,
 
 	htlcSpend := false
 	invoiceFinalized := false
+	htlcKeyRevealed := false
 	for !htlcSpend || !invoiceFinalized {
 		select {
 		// Spend notification error.
@@ -825,6 +856,10 @@ func (s *loopInSwap) waitForSwapComplete(ctx context.Context,
 				return err
 			}
 
+			if invoiceFinalized && !htlcKeyRevealed {
+				htlcKeyRevealed = s.tryPushHtlcKey(ctx)
+			}
+
 		// The htlc spend is confirmed. Inspect the spending tx to
 		// determine the final swap state.
 		case spendDetails := <-spendChan:
@@ -888,6 +923,7 @@ func (s *loopInSwap) waitForSwapComplete(ctx context.Context,
 				}
 
 				invoiceFinalized = true
+				htlcKeyRevealed = s.tryPushHtlcKey(ctx)
 
 			// Canceled invoice has no effect on server cost
 			// balance.
@@ -903,6 +939,36 @@ func (s *loopInSwap) waitForSwapComplete(ctx context.Context,
 	return nil
 }
 
+// tryPushHtlcKey attempts to push the htlc key to the server. If the server
+// returns an error of any kind we'll log it as a warning but won't act as
+// the swap execution can just go on without the server gaining knowledge of
+// our internal key.
+func (s *loopInSwap) tryPushHtlcKey(ctx context.Context) bool {
+	if s.ProtocolVersion < loopdb.ProtocolVersionMuSig2 {
+		return false
+	}
+
+	log.Infof("Attempting to reveal internal HTLC key to the server")
+
+	internalPrivKey, err := sharedSecretFromHash(
+		ctx, s.swapConfig.lnd.Signer, s.hash,
+	)
+	if err != nil {
+		s.log.Warnf("Unable to derive HTLC internal private key: %v",
+			err)
+
+		return false
+	}
+
+	err = s.server.PushKey(ctx, s.ProtocolVersion, s.hash, internalPrivKey)
+	if err != nil {
+		s.log.Warnf("Internal HTLC key reveal failed: %v", err)
+		return false
+	}
+
+	return true
+}
+
 func (s *loopInSwap) processHtlcSpend(ctx context.Context,
 	spend *chainntnfs.SpendDetail, htlcValue,
 	sweepFee btcutil.Amount) error {
@@ -975,8 +1041,9 @@ func (s *loopInSwap) publishTimeoutTx(ctx context.Context,
 
 	sequence := uint32(0)
 	timeoutTx, err := s.sweeper.CreateSweepTx(
-		ctx, s.height, sequence, s.htlc, *htlcOutpoint, s.SenderKey,
-		redeemScript, witnessFunc, htlcValue, fee, s.timeoutAddr,
+		ctx, s.height, sequence, s.htlc, *htlcOutpoint,
+		s.HtlcKeys.SenderScriptKey, redeemScript, witnessFunc,
+		htlcValue, fee, s.timeoutAddr,
 	)
 	if err != nil {
 		return 0, err
@@ -1026,3 +1093,18 @@ func (s *loopInSwap) setState(state loopdb.SwapState) {
 	s.lastUpdateTime = time.Now()
 	s.state = state
 }
+
+// sharedSecretFromHash derives the shared secret from the swap hash using the
+// swap.KeyFamily family and zero as index.
+func sharedSecretFromHash(ctx context.Context, signer lndclient.SignerClient,
+	hash lntypes.Hash) ([32]byte, error) {
+
+	_, hashPubKey := btcec.PrivKeyFromBytes(hash[:])
+
+	return signer.DeriveSharedKey(
+		ctx, hashPubKey, &keychain.KeyLocator{
+			Family: keychain.KeyFamily(swap.KeyFamily),
+			Index:  0,
+		},
+	)
+}
diff --git a/loopin_test.go b/loopin_test.go
index 7bf3b8f..de4452b 100644
--- a/loopin_test.go
+++ b/loopin_test.go
@@ -8,10 +8,8 @@ import (
 	"github.com/btcsuite/btcd/btcutil"
 	"github.com/btcsuite/btcd/wire"
 	"github.com/lightninglabs/loop/loopdb"
-	"github.com/lightninglabs/loop/swap"
 	"github.com/lightninglabs/loop/test"
 	"github.com/lightningnetwork/lnd/chainntnfs"
-	"github.com/lightningnetwork/lnd/input"
 	invpkg "github.com/lightningnetwork/lnd/invoices"
 	"github.com/lightningnetwork/lnd/routing/route"
 	"github.com/stretchr/testify/require"
@@ -343,6 +341,7 @@ func TestLoopInResume(t *testing.T) {
 		loopdb.ProtocolVersionUnrecorded,
 		loopdb.ProtocolVersionHtlcV2,
 		loopdb.ProtocolVersionHtlcV3,
+		loopdb.ProtocolVersionMuSig2,
 	}
 
 	testCases := []struct {
@@ -414,8 +413,12 @@ func testLoopInResume(t *testing.T, state loopdb.SwapState, expired bool,
 			Preimage:        testPreimage,
 			AmountRequested: 100000,
 			CltvExpiry:      744,
-			ReceiverKey:     receiverKey,
-			SenderKey:       senderKey,
+			HtlcKeys: loopdb.HtlcKeys{
+				SenderScriptKey:        senderKey,
+				SenderInternalPubKey:   senderKey,
+				ReceiverScriptKey:      receiverKey,
+				ReceiverInternalPubKey: receiverKey,
+			},
 			MaxSwapFee:      60000,
 			MaxMinerFee:     50000,
 			ProtocolVersion: storedVersion,
@@ -445,32 +448,10 @@ func testLoopInResume(t *testing.T, state loopdb.SwapState, expired bool,
 		pendSwap.Loop.Events[0].Cost = cost
 	}
 
-	var (
-		htlc *swap.Htlc
-		err  error
+	htlc, err := GetHtlc(
+		testPreimage.Hash(), &contract.SwapContract,
+		cfg.lnd.ChainParams,
 	)
-
-	switch GetHtlcScriptVersion(storedVersion) {
-	case swap.HtlcV2:
-		htlc, err = swap.NewHtlcV2(
-			contract.CltvExpiry, contract.SenderKey,
-			contract.ReceiverKey, testPreimage.Hash(),
-			cfg.lnd.ChainParams,
-		)
-
-	case swap.HtlcV3:
-		htlc, err = swap.NewHtlcV3(
-			input.MuSig2Version040,
-			contract.CltvExpiry, contract.SenderKey,
-			contract.ReceiverKey, contract.SenderKey,
-			contract.ReceiverKey, testPreimage.Hash(),
-			cfg.lnd.ChainParams,
-		)
-
-	default:
-		t.Fatalf("unknown HTLC script version")
-	}
-
 	require.NoError(t, err)
 
 	err = ctx.store.CreateLoopIn(testPreimage.Hash(), contract)
diff --git a/loopout.go b/loopout.go
index 00654fe..eca55bc 100644
--- a/loopout.go
+++ b/loopout.go
@@ -181,16 +181,20 @@ func newLoopOutSwap(globalCtx context.Context, cfg *swapConfig,
 		SwapContract: loopdb.SwapContract{
 			InitiationHeight: currentHeight,
 			InitiationTime:   initiationTime,
-			SenderKey:        swapResp.senderKey,
-			ReceiverKey:      receiverKey,
-			ClientKeyLocator: keyDesc.KeyLocator,
-			Preimage:         swapPreimage,
-			AmountRequested:  request.Amount,
-			CltvExpiry:       request.Expiry,
-			MaxMinerFee:      request.MaxMinerFee,
-			MaxSwapFee:       request.MaxSwapFee,
-			Label:            request.Label,
-			ProtocolVersion:  loopdb.CurrentProtocolVersion(),
+			HtlcKeys: loopdb.HtlcKeys{
+				SenderScriptKey:        swapResp.senderKey,
+				SenderInternalPubKey:   swapResp.senderKey,
+				ReceiverScriptKey:      receiverKey,
+				ReceiverInternalPubKey: receiverKey,
+				ClientScriptKeyLocator: keyDesc.KeyLocator,
+			},
+			Preimage:        swapPreimage,
+			AmountRequested: request.Amount,
+			CltvExpiry:      request.Expiry,
+			MaxMinerFee:     request.MaxMinerFee,
+			MaxSwapFee:      request.MaxSwapFee,
+			Label:           request.Label,
+			ProtocolVersion: loopdb.CurrentProtocolVersion(),
 		},
 		OutgoingChanSet: chanSet,
 	}
@@ -1351,11 +1355,28 @@ func (s *loopOutSwap) createMuSig2SweepTxn(
 		return nil, err
 	}
 
-	signers := [][]byte{
-		s.SenderKey[1:], s.ReceiverKey[1:],
+	var (
+		signers      [][]byte
+		muSig2Verion input.MuSig2Version
+	)
+
+	// Depending on the MuSig2 version we either pass 32 byte Schnorr
+	// public keys or normal 33 byte public keys.
+	if s.ProtocolVersion >= loopdb.ProtocolVersionMuSig2 {
+		muSig2Verion = input.MuSig2Version100RC2
+		signers = [][]byte{
+			s.HtlcKeys.SenderInternalPubKey[:],
+			s.HtlcKeys.ReceiverInternalPubKey[:],
+		}
+	} else {
+		muSig2Verion = input.MuSig2Version040
+		signers = [][]byte{
+			s.HtlcKeys.SenderInternalPubKey[1:],
+			s.HtlcKeys.ReceiverInternalPubKey[1:],
+		}
 	}
 
-	htlc, ok := s.htlc.HtlcScript.(*swap.HtlcScriptV3)
+	htlcScript, ok := s.htlc.HtlcScript.(*swap.HtlcScriptV3)
 	if !ok {
 		return nil, fmt.Errorf("non taproot htlc")
 	}
@@ -1363,8 +1384,8 @@ func (s *loopOutSwap) createMuSig2SweepTxn(
 	// Now we're creating a local MuSig2 session using the receiver key's
 	// key locator and the htlc's root hash.
 	musig2SessionInfo, err := s.lnd.Signer.MuSig2CreateSession(
-		ctx, input.MuSig2Version040, &s.ClientKeyLocator,
-		signers, lndclient.MuSig2TaprootTweakOpt(htlc.RootHash[:], false),
+		ctx, muSig2Verion, &s.HtlcKeys.ClientScriptKeyLocator, signers,
+		lndclient.MuSig2TaprootTweakOpt(htlcScript.RootHash[:], false),
 	)
 	if err != nil {
 		return nil, err
@@ -1428,7 +1449,7 @@ func (s *loopOutSwap) createMuSig2SweepTxn(
 	// To be sure that we're good, parse and validate that the combined
 	// signature is indeed valid for the sig hash and the internal pubkey.
 	err = s.executeConfig.verifySchnorrSig(
-		htlc.TaprootKey, sigHash, finalSig,
+		htlcScript.TaprootKey, sigHash, finalSig,
 	)
 	if err != nil {
 		return nil, err
@@ -1609,8 +1630,8 @@ func (s *loopOutSwap) sweep(ctx context.Context, htlcOutpoint wire.OutPoint,
 	// Create sweep tx.
 	sweepTx, err := s.sweeper.CreateSweepTx(
 		ctx, s.height, s.htlc.SuccessSequence(), s.htlc,
-		htlcOutpoint, s.ReceiverKey, redeemScript, witnessFunc,
-		htlcValue, fee, s.DestAddr,
+		htlcOutpoint, s.contract.HtlcKeys.ReceiverScriptKey,
+		redeemScript, witnessFunc, htlcValue, fee, s.DestAddr,
 	)
 	if err != nil {
 		return err
diff --git a/server_mock_test.go b/server_mock_test.go
index 28c42fe..82f3c30 100644
--- a/server_mock_test.go
+++ b/server_mock_test.go
@@ -151,17 +151,22 @@ func getInvoice(hash lntypes.Hash, amt btcutil.Amount, memo string) (string, err
 }
 
 func (s *serverMock) NewLoopInSwap(_ context.Context, swapHash lntypes.Hash,
-	amount btcutil.Amount, _ [33]byte, swapInvoice, _ string,
+	amount btcutil.Amount, _, _ [33]byte, swapInvoice, _ string,
 	_ *route.Vertex, _ string) (*newLoopInResponse, error) {
 
 	_, receiverKey := test.CreateKey(101)
+	_, receiverInternalKey := test.CreateKey(102)
 
 	if amount != s.expectedSwapAmt {
 		return nil, errors.New("unexpected test swap amount")
 	}
 
-	var receiverKeyArray [33]byte
+	var receiverKeyArray, receiverInternalKeyArray [33]byte
 	copy(receiverKeyArray[:], receiverKey.SerializeCompressed())
+	copy(
+		receiverInternalKeyArray[:],
+		receiverInternalKey.SerializeCompressed(),
+	)
 
 	s.swapInvoice = swapInvoice
 	s.swapHash = swapHash
@@ -175,8 +180,9 @@ func (s *serverMock) NewLoopInSwap(_ context.Context, swapHash lntypes.Hash,
 	<-s.lnd.FailInvoiceChannel
 
 	resp := &newLoopInResponse{
-		expiry:      s.height + testChargeOnChainCltvDelta,
-		receiverKey: receiverKeyArray,
+		expiry:              s.height + testChargeOnChainCltvDelta,
+		receiverKey:         receiverKeyArray,
+		receiverInternalKey: receiverInternalKeyArray,
 	}
 
 	return resp, nil
@@ -261,3 +267,9 @@ func (s *serverMock) MuSig2SignSweep(_ context.Context, _ loopdb.ProtocolVersion
 
 	return nil, nil, nil
 }
+
+func (s *serverMock) PushKey(_ context.Context, _ loopdb.ProtocolVersion,
+	_ lntypes.Hash, _ [32]byte) error {
+
+	return nil
+}
diff --git a/swap.go b/swap.go
index 6e2d947..d816990 100644
--- a/swap.go
+++ b/swap.go
@@ -76,18 +76,27 @@ func GetHtlc(hash lntypes.Hash, contract *loopdb.SwapContract,
 	switch GetHtlcScriptVersion(contract.ProtocolVersion) {
 	case swap.HtlcV2:
 		return swap.NewHtlcV2(
-			contract.CltvExpiry, contract.SenderKey,
-			contract.ReceiverKey, hash,
+			contract.CltvExpiry, contract.HtlcKeys.SenderScriptKey,
+			contract.HtlcKeys.ReceiverScriptKey, hash,
 			chainParams,
 		)
 
 	case swap.HtlcV3:
+		// Swaps that implement the new MuSig2 protocol will be expected
+		// to use the 1.0RC2 MuSig2 key derivation scheme.
+		muSig2Version := input.MuSig2Version040
+		if contract.ProtocolVersion >= loopdb.ProtocolVersionMuSig2 {
+			muSig2Version = input.MuSig2Version100RC2
+		}
+
 		return swap.NewHtlcV3(
-			input.MuSig2Version040,
-			contract.CltvExpiry, contract.SenderKey,
-			contract.ReceiverKey, contract.SenderKey,
-			contract.ReceiverKey, hash,
-			chainParams,
+			muSig2Version,
+			contract.CltvExpiry,
+			contract.HtlcKeys.SenderInternalPubKey,
+			contract.HtlcKeys.ReceiverInternalPubKey,
+			contract.HtlcKeys.SenderScriptKey,
+			contract.HtlcKeys.ReceiverScriptKey,
+			hash, chainParams,
 		)
 	}
 
diff --git a/swap_server_client.go b/swap_server_client.go
index b2d23c5..1a752a5 100644
--- a/swap_server_client.go
+++ b/swap_server_client.go
@@ -94,10 +94,10 @@ type swapServerClient interface {
 		preimage lntypes.Preimage) error
 
 	NewLoopInSwap(ctx context.Context,
-		swapHash lntypes.Hash, amount btcutil.Amount,
-		senderKey [33]byte, swapInvoice, probeInvoice string,
-		lastHop *route.Vertex, initiator string) (*newLoopInResponse,
-		error)
+		swapHash lntypes.Hash, amount btcutil.Amount, senderScriptKey,
+		senderInternalKey [33]byte, swapInvoice, probeInvoice string,
+		lastHop *route.Vertex, initiator string) (
+		*newLoopInResponse, error)
 
 	// SubscribeLoopOutUpdates subscribes to loop out server state.
 	SubscribeLoopOutUpdates(ctx context.Context,
@@ -128,6 +128,12 @@ type swapServerClient interface {
 		protocolVersion loopdb.ProtocolVersion, swapHash lntypes.Hash,
 		paymentAddr [32]byte, nonce []byte, sweepTxPsbt []byte) (
 		[]byte, []byte, error)
+
+	// PushKey sends the client's HTLC internal key associated with the
+	// swap to the server.
+	PushKey(ctx context.Context,
+		protocolVersion loopdb.ProtocolVersion, swapHash lntypes.Hash,
+		clientInternalPrivateKey [32]byte) error
 }
 
 type grpcSwapServerClient struct {
@@ -419,9 +425,9 @@ func (s *grpcSwapServerClient) PushLoopOutPreimage(ctx context.Context,
 }
 
 func (s *grpcSwapServerClient) NewLoopInSwap(ctx context.Context,
-	swapHash lntypes.Hash, amount btcutil.Amount, senderKey [33]byte,
-	swapInvoice, probeInvoice string, lastHop *route.Vertex,
-	initiator string) (*newLoopInResponse, error) {
+	swapHash lntypes.Hash, amount btcutil.Amount, senderScriptKey,
+	senderInternalKey [33]byte, swapInvoice, probeInvoice string,
+	lastHop *route.Vertex, initiator string) (*newLoopInResponse, error) {
 
 	rpcCtx, rpcCancel := context.WithTimeout(ctx, globalCallTimeout)
 	defer rpcCancel()
@@ -429,7 +435,7 @@ func (s *grpcSwapServerClient) NewLoopInSwap(ctx context.Context,
 	req := &looprpc.ServerLoopInRequest{
 		SwapHash:        swapHash[:],
 		Amt:             uint64(amount),
-		SenderKey:       senderKey[:],
+		SenderKey:       senderScriptKey[:],
 		SwapInvoice:     swapInvoice,
 		ProtocolVersion: loopdb.CurrentRPCProtocolVersion(),
 		ProbeInvoice:    probeInvoice,
@@ -439,13 +445,19 @@ func (s *grpcSwapServerClient) NewLoopInSwap(ctx context.Context,
 		req.LastHop = lastHop[:]
 	}
 
+	// Set the client's internal key if this is a MuSig2 swap.
+	if loopdb.CurrentProtocolVersion() >= loopdb.ProtocolVersionMuSig2 {
+		req.SenderInternalPubkey = senderInternalKey[:]
+	}
+
 	swapResp, err := s.server.NewLoopInSwap(rpcCtx, req)
 	if err != nil {
 		return nil, err
 	}
 
-	var receiverKey [33]byte
+	var receiverKey, receiverInternalKey [33]byte
 	copy(receiverKey[:], swapResp.ReceiverKey)
+	copy(receiverInternalKey[:], swapResp.ReceiverInternalPubkey)
 
 	// Validate receiver key.
 	_, err = btcec.ParsePubKey(receiverKey[:])
@@ -454,9 +466,10 @@ func (s *grpcSwapServerClient) NewLoopInSwap(ctx context.Context,
 	}
 
 	return &newLoopInResponse{
-		receiverKey:   receiverKey,
-		expiry:        swapResp.Expiry,
-		serverMessage: swapResp.ServerMessage,
+		receiverKey:         receiverKey,
+		receiverInternalKey: receiverInternalKey,
+		expiry:              swapResp.Expiry,
+		serverMessage:       swapResp.ServerMessage,
 	}, nil
 }
 
@@ -753,6 +766,25 @@ func (s *grpcSwapServerClient) MuSig2SignSweep(ctx context.Context,
 	return res.Nonce, res.PartialSignature, nil
 }
 
+// PushKey sends the client's HTLC internal key associated with the swap to
+// the server.
+func (s *grpcSwapServerClient) PushKey(ctx context.Context,
+	protocolVersion loopdb.ProtocolVersion, swapHash lntypes.Hash,
+	clientInternalPrivateKey [32]byte) error {
+
+	req := &looprpc.ServerPushKeyReq{
+		ProtocolVersion: looprpc.ProtocolVersion(protocolVersion),
+		SwapHash:        swapHash[:],
+		InternalPrivkey: clientInternalPrivateKey[:],
+	}
+
+	rpcCtx, rpcCancel := context.WithTimeout(ctx, globalCallTimeout)
+	defer rpcCancel()
+
+	_, err := s.server.PushKey(rpcCtx, req)
+	return err
+}
+
 func rpcRouteCancel(details *outCancelDetails) (
 	*looprpc.CancelLoopOutSwapRequest_RouteCancel, error) {
 
@@ -873,7 +905,8 @@ type newLoopOutResponse struct {
 }
 
 type newLoopInResponse struct {
-	receiverKey   [33]byte
-	expiry        int32
-	serverMessage string
+	receiverKey         [33]byte
+	receiverInternalKey [33]byte
+	expiry              int32
+	serverMessage       string
 }
diff --git a/swapserverrpc/server.pb.go b/swapserverrpc/server.pb.go
index 28d3f6e..cf553b8 100644
--- a/swapserverrpc/server.pb.go
+++ b/swapserverrpc/server.pb.go
@@ -64,6 +64,8 @@ const (
 	ProtocolVersion_ROUTING_PLUGIN ProtocolVersion = 9
 	// The client will use the new v3 (taproot) HTLC scripts.
 	ProtocolVersion_HTLC_V3 ProtocolVersion = 10
+	// Enables MuSig2 signature scheme for swaps.
+	ProtocolVersion_MUSIG2 ProtocolVersion = 11
 )
 
 // Enum value maps for ProtocolVersion.
@@ -80,6 +82,7 @@ var (
 		8:  "PROBE",
 		9:  "ROUTING_PLUGIN",
 		10: "HTLC_V3",
+		11: "MUSIG2",
 	}
 	ProtocolVersion_value = map[string]int32{
 		"LEGACY":                 0,
@@ -93,6 +96,7 @@ var (
 		"PROBE":                  8,
 		"ROUTING_PLUGIN":         9,
 		"HTLC_V3":                10,
+		"MUSIG2":                 11,
 	}
 )
 
@@ -923,14 +927,16 @@ type ServerLoopInRequest struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	SenderKey   []byte `protobuf:"bytes,1,opt,name=sender_key,json=senderKey,proto3" json:"sender_key,omitempty"`
-	SwapHash    []byte `protobuf:"bytes,2,opt,name=swap_hash,json=swapHash,proto3" json:"swap_hash,omitempty"`
-	Amt         uint64 `protobuf:"varint,3,opt,name=amt,proto3" json:"amt,omitempty"`
-	SwapInvoice string `protobuf:"bytes,4,opt,name=swap_invoice,json=swapInvoice,proto3" json:"swap_invoice,omitempty"`
-	LastHop     []byte `protobuf:"bytes,5,opt,name=last_hop,json=lastHop,proto3" json:"last_hop,omitempty"`
+	SenderKey            []byte `protobuf:"bytes,1,opt,name=sender_key,json=senderKey,proto3" json:"sender_key,omitempty"`
+	SenderInternalPubkey []byte `protobuf:"bytes,9,opt,name=sender_internal_pubkey,json=senderInternalPubkey,proto3" json:"sender_internal_pubkey,omitempty"`
+	SwapHash             []byte `protobuf:"bytes,2,opt,name=swap_hash,json=swapHash,proto3" json:"swap_hash,omitempty"`
+	Amt                  uint64 `protobuf:"varint,3,opt,name=amt,proto3" json:"amt,omitempty"`
+	SwapInvoice          string `protobuf:"bytes,4,opt,name=swap_invoice,json=swapInvoice,proto3" json:"swap_invoice,omitempty"`
+	LastHop              []byte `protobuf:"bytes,5,opt,name=last_hop,json=lastHop,proto3" json:"last_hop,omitempty"`
 	/// The protocol version that the client adheres to.
 	ProtocolVersion ProtocolVersion `protobuf:"varint,6,opt,name=protocol_version,json=protocolVersion,proto3,enum=looprpc.ProtocolVersion" json:"protocol_version,omitempty"`
-	ProbeInvoice    string          `protobuf:"bytes,7,opt,name=probe_invoice,json=probeInvoice,proto3" json:"probe_invoice,omitempty"`
+	// An invoice that can be used for the purpose of probing.
+	ProbeInvoice string `protobuf:"bytes,7,opt,name=probe_invoice,json=probeInvoice,proto3" json:"probe_invoice,omitempty"`
 	// The user agent string that identifies the software running on the user's
 	// side. This can be changed in the user's client software but it _SHOULD_
 	// conform to the following pattern:
@@ -980,6 +986,13 @@ func (x *ServerLoopInRequest) GetSenderKey() []byte {
 	return nil
 }
 
+func (x *ServerLoopInRequest) GetSenderInternalPubkey() []byte {
+	if x != nil {
+		return x.SenderInternalPubkey
+	}
+	return nil
+}
+
 func (x *ServerLoopInRequest) GetSwapHash() []byte {
 	if x != nil {
 		return x.SwapHash
@@ -1034,8 +1047,9 @@ type ServerLoopInResponse struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	ReceiverKey []byte `protobuf:"bytes,1,opt,name=receiver_key,json=receiverKey,proto3" json:"receiver_key,omitempty"`
-	Expiry      int32  `protobuf:"varint,2,opt,name=expiry,proto3" json:"expiry,omitempty"`
+	ReceiverKey            []byte `protobuf:"bytes,1,opt,name=receiver_key,json=receiverKey,proto3" json:"receiver_key,omitempty"`
+	ReceiverInternalPubkey []byte `protobuf:"bytes,9,opt,name=receiver_internal_pubkey,json=receiverInternalPubkey,proto3" json:"receiver_internal_pubkey,omitempty"`
+	Expiry                 int32  `protobuf:"varint,2,opt,name=expiry,proto3" json:"expiry,omitempty"`
 	// A human-readable message from the loop server.
 	ServerMessage string `protobuf:"bytes,3,opt,name=server_message,json=serverMessage,proto3" json:"server_message,omitempty"`
 }
@@ -1079,6 +1093,13 @@ func (x *ServerLoopInResponse) GetReceiverKey() []byte {
 	return nil
 }
 
+func (x *ServerLoopInResponse) GetReceiverInternalPubkey() []byte {
+	if x != nil {
+		return x.ReceiverInternalPubkey
+	}
+	return nil
+}
+
 func (x *ServerLoopInResponse) GetExpiry() int32 {
 	if x != nil {
 		return x.Expiry
@@ -1891,7 +1912,7 @@ type ServerProbeRequest struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	/// The protocol version that the client adheres to.
+	// The protocol version that the client adheres to.
 	ProtocolVersion ProtocolVersion `protobuf:"varint,1,opt,name=protocol_version,json=protocolVersion,proto3,enum=looprpc.ProtocolVersion" json:"protocol_version,omitempty"`
 	// The probe amount.
 	Amt uint64 `protobuf:"varint,2,opt,name=amt,proto3" json:"amt,omitempty"`
@@ -1899,8 +1920,7 @@ type ServerProbeRequest struct {
 	Target []byte `protobuf:"bytes,3,opt,name=target,proto3" json:"target,omitempty"`
 	// Optional last hop to use when probing the client.
 	LastHop []byte `protobuf:"bytes,4,opt,name=last_hop,json=lastHop,proto3" json:"last_hop,omitempty"`
-	//
-	//Optional route hints to reach the destination through private channels.
+	// Optional route hints to reach the destination through private channels.
 	RouteHints []*RouteHint `protobuf:"bytes,5,rep,name=route_hints,json=routeHints,proto3" json:"route_hints,omitempty"`
 }
 
@@ -2404,6 +2424,110 @@ func (x *MuSig2SignSweepRes) GetPartialSignature() []byte {
 	return nil
 }
 
+type ServerPushKeyReq struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// The protocol version that the client adheres to.
+	ProtocolVersion ProtocolVersion `protobuf:"varint,1,opt,name=protocol_version,json=protocolVersion,proto3,enum=looprpc.ProtocolVersion" json:"protocol_version,omitempty"`
+	// The swap hash.
+	SwapHash []byte `protobuf:"bytes,2,opt,name=swap_hash,json=swapHash,proto3" json:"swap_hash,omitempty"`
+	// The client’s private key used in the HTLC’s aggregated internal key.
+	InternalPrivkey []byte `protobuf:"bytes,3,opt,name=internal_privkey,json=internalPrivkey,proto3" json:"internal_privkey,omitempty"`
+}
+
+func (x *ServerPushKeyReq) Reset() {
+	*x = ServerPushKeyReq{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_server_proto_msgTypes[29]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *ServerPushKeyReq) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ServerPushKeyReq) ProtoMessage() {}
+
+func (x *ServerPushKeyReq) ProtoReflect() protoreflect.Message {
+	mi := &file_server_proto_msgTypes[29]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ServerPushKeyReq.ProtoReflect.Descriptor instead.
+func (*ServerPushKeyReq) Descriptor() ([]byte, []int) {
+	return file_server_proto_rawDescGZIP(), []int{29}
+}
+
+func (x *ServerPushKeyReq) GetProtocolVersion() ProtocolVersion {
+	if x != nil {
+		return x.ProtocolVersion
+	}
+	return ProtocolVersion_LEGACY
+}
+
+func (x *ServerPushKeyReq) GetSwapHash() []byte {
+	if x != nil {
+		return x.SwapHash
+	}
+	return nil
+}
+
+func (x *ServerPushKeyReq) GetInternalPrivkey() []byte {
+	if x != nil {
+		return x.InternalPrivkey
+	}
+	return nil
+}
+
+type ServerPushKeyRes struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+}
+
+func (x *ServerPushKeyRes) Reset() {
+	*x = ServerPushKeyRes{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_server_proto_msgTypes[30]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *ServerPushKeyRes) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ServerPushKeyRes) ProtoMessage() {}
+
+func (x *ServerPushKeyRes) ProtoReflect() protoreflect.Message {
+	mi := &file_server_proto_msgTypes[30]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ServerPushKeyRes.ProtoReflect.Descriptor instead.
+func (*ServerPushKeyRes) Descriptor() ([]byte, []int) {
+	return file_server_proto_rawDescGZIP(), []int{30}
+}
+
 var File_server_proto protoreflect.FileDescriptor
 
 var file_server_proto_rawDesc = []byte{
@@ -2487,190 +2611,177 @@ var file_server_proto_rawDesc = []byte{
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+	0x6f, 0x33,
 }
 
 var (
@@ -2856,7 +3004,7 @@ func file_server_proto_rawDescGZIP() []byte {
 }
 
 var file_server_proto_enumTypes = make([]protoimpl.EnumInfo, 5)
-var file_server_proto_msgTypes = make([]protoimpl.MessageInfo, 29)
+var file_server_proto_msgTypes = make([]protoimpl.MessageInfo, 31)
 var file_server_proto_goTypes = []interface{}{
 	(ProtocolVersion)(0),                      // 0: looprpc.ProtocolVersion
 	(ServerSwapState)(0),                      // 1: looprpc.ServerSwapState
@@ -2892,14 +3040,16 @@ var file_server_proto_goTypes = []interface{}{
 	(*ReportRoutingResultRes)(nil),            // 31: looprpc.ReportRoutingResultRes
 	(*MuSig2SignSweepReq)(nil),                // 32: looprpc.MuSig2SignSweepReq
 	(*MuSig2SignSweepRes)(nil),                // 33: looprpc.MuSig2SignSweepRes
-	(*RouteHint)(nil),                         // 34: looprpc.RouteHint
+	(*ServerPushKeyReq)(nil),                  // 34: looprpc.ServerPushKeyReq
+	(*ServerPushKeyRes)(nil),                  // 35: looprpc.ServerPushKeyRes
+	(*RouteHint)(nil),                         // 36: looprpc.RouteHint
 }
 var file_server_proto_depIdxs = []int32{
 	0,  // 0: looprpc.ServerLoopOutRequest.protocol_version:type_name -> looprpc.ProtocolVersion
 	0,  // 1: looprpc.ServerLoopOutQuoteRequest.protocol_version:type_name -> looprpc.ProtocolVersion
 	0,  // 2: looprpc.ServerLoopOutTermsRequest.protocol_version:type_name -> looprpc.ProtocolVersion
 	0,  // 3: looprpc.ServerLoopInRequest.protocol_version:type_name -> looprpc.ProtocolVersion
-	34, // 4: looprpc.ServerLoopInQuoteRequest.route_hints:type_name -> looprpc.RouteHint
+	36, // 4: looprpc.ServerLoopInQuoteRequest.route_hints:type_name -> looprpc.RouteHint
 	0,  // 5: looprpc.ServerLoopInQuoteRequest.protocol_version:type_name -> looprpc.ProtocolVersion
 	0,  // 6: looprpc.ServerLoopInTermsRequest.protocol_version:type_name -> looprpc.ProtocolVersion
 	0,  // 7: looprpc.ServerLoopOutPushPreimageRequest.protocol_version:type_name -> looprpc.ProtocolVersion
@@ -2912,45 +3062,48 @@ var file_server_proto_depIdxs = []int32{
 	0,  // 14: looprpc.CancelLoopOutSwapRequest.protocol_version:type_name -> looprpc.ProtocolVersion
 	22, // 15: looprpc.CancelLoopOutSwapRequest.route_cancel:type_name -> looprpc.RouteCancel
 	0,  // 16: looprpc.ServerProbeRequest.protocol_version:type_name -> looprpc.ProtocolVersion
-	34, // 17: looprpc.ServerProbeRequest.route_hints:type_name -> looprpc.RouteHint
+	36, // 17: looprpc.ServerProbeRequest.route_hints:type_name -> looprpc.RouteHint
 	0,  // 18: looprpc.RecommendRoutingPluginReq.protocol_version:type_name -> looprpc.ProtocolVersion
 	4,  // 19: looprpc.RecommendRoutingPluginRes.plugin:type_name -> looprpc.RoutingPlugin
 	0,  // 20: looprpc.ReportRoutingResultReq.protocol_version:type_name -> looprpc.ProtocolVersion
 	4,  // 21: looprpc.ReportRoutingResultReq.plugin:type_name -> looprpc.RoutingPlugin
 	0,  // 22: looprpc.MuSig2SignSweepReq.protocol_version:type_name -> looprpc.ProtocolVersion
-	9,  // 23: looprpc.SwapServer.LoopOutTerms:input_type -> looprpc.ServerLoopOutTermsRequest
-	5,  // 24: looprpc.SwapServer.NewLoopOutSwap:input_type -> looprpc.ServerLoopOutRequest
-	17, // 25: looprpc.SwapServer.LoopOutPushPreimage:input_type -> looprpc.ServerLoopOutPushPreimageRequest
-	7,  // 26: looprpc.SwapServer.LoopOutQuote:input_type -> looprpc.ServerLoopOutQuoteRequest
-	15, // 27: looprpc.SwapServer.LoopInTerms:input_type -> looprpc.ServerLoopInTermsRequest
-	11, // 28: looprpc.SwapServer.NewLoopInSwap:input_type -> looprpc.ServerLoopInRequest
-	13, // 29: looprpc.SwapServer.LoopInQuote:input_type -> looprpc.ServerLoopInQuoteRequest
-	19, // 30: looprpc.SwapServer.SubscribeLoopOutUpdates:input_type -> looprpc.SubscribeUpdatesRequest
-	19, // 31: looprpc.SwapServer.SubscribeLoopInUpdates:input_type -> looprpc.SubscribeUpdatesRequest
-	24, // 32: looprpc.SwapServer.CancelLoopOutSwap:input_type -> looprpc.CancelLoopOutSwapRequest
-	26, // 33: looprpc.SwapServer.Probe:input_type -> looprpc.ServerProbeRequest
-	28, // 34: looprpc.SwapServer.RecommendRoutingPlugin:input_type -> looprpc.RecommendRoutingPluginReq
-	30, // 35: looprpc.SwapServer.ReportRoutingResult:input_type -> looprpc.ReportRoutingResultReq
-	32, // 36: looprpc.SwapServer.MuSig2SignSweep:input_type -> looprpc.MuSig2SignSweepReq
-	10, // 37: looprpc.SwapServer.LoopOutTerms:output_type -> looprpc.ServerLoopOutTerms
-	6,  // 38: looprpc.SwapServer.NewLoopOutSwap:output_type -> looprpc.ServerLoopOutResponse
-	18, // 39: looprpc.SwapServer.LoopOutPushPreimage:output_type -> looprpc.ServerLoopOutPushPreimageResponse
-	8,  // 40: looprpc.SwapServer.LoopOutQuote:output_type -> looprpc.ServerLoopOutQuote
-	16, // 41: looprpc.SwapServer.LoopInTerms:output_type -> looprpc.ServerLoopInTerms
-	12, // 42: looprpc.SwapServer.NewLoopInSwap:output_type -> looprpc.ServerLoopInResponse
-	14, // 43: looprpc.SwapServer.LoopInQuote:output_type -> looprpc.ServerLoopInQuoteResponse
-	20, // 44: looprpc.SwapServer.SubscribeLoopOutUpdates:output_type -> looprpc.SubscribeLoopOutUpdatesResponse
-	21, // 45: looprpc.SwapServer.SubscribeLoopInUpdates:output_type -> looprpc.SubscribeLoopInUpdatesResponse
-	25, // 46: looprpc.SwapServer.CancelLoopOutSwap:output_type -> looprpc.CancelLoopOutSwapResponse
-	27, // 47: looprpc.SwapServer.Probe:output_type -> looprpc.ServerProbeResponse
-	29, // 48: looprpc.SwapServer.RecommendRoutingPlugin:output_type -> looprpc.RecommendRoutingPluginRes
-	31, // 49: looprpc.SwapServer.ReportRoutingResult:output_type -> looprpc.ReportRoutingResultRes
-	33, // 50: looprpc.SwapServer.MuSig2SignSweep:output_type -> looprpc.MuSig2SignSweepRes
-	37, // [37:51] is the sub-list for method output_type
-	23, // [23:37] is the sub-list for method input_type
-	23, // [23:23] is the sub-list for extension type_name
-	23, // [23:23] is the sub-list for extension extendee
-	0,  // [0:23] is the sub-list for field type_name
+	0,  // 23: looprpc.ServerPushKeyReq.protocol_version:type_name -> looprpc.ProtocolVersion
+	9,  // 24: looprpc.SwapServer.LoopOutTerms:input_type -> looprpc.ServerLoopOutTermsRequest
+	5,  // 25: looprpc.SwapServer.NewLoopOutSwap:input_type -> looprpc.ServerLoopOutRequest
+	17, // 26: looprpc.SwapServer.LoopOutPushPreimage:input_type -> looprpc.ServerLoopOutPushPreimageRequest
+	7,  // 27: looprpc.SwapServer.LoopOutQuote:input_type -> looprpc.ServerLoopOutQuoteRequest
+	15, // 28: looprpc.SwapServer.LoopInTerms:input_type -> looprpc.ServerLoopInTermsRequest
+	11, // 29: looprpc.SwapServer.NewLoopInSwap:input_type -> looprpc.ServerLoopInRequest
+	13, // 30: looprpc.SwapServer.LoopInQuote:input_type -> looprpc.ServerLoopInQuoteRequest
+	19, // 31: looprpc.SwapServer.SubscribeLoopOutUpdates:input_type -> looprpc.SubscribeUpdatesRequest
+	19, // 32: looprpc.SwapServer.SubscribeLoopInUpdates:input_type -> looprpc.SubscribeUpdatesRequest
+	24, // 33: looprpc.SwapServer.CancelLoopOutSwap:input_type -> looprpc.CancelLoopOutSwapRequest
+	26, // 34: looprpc.SwapServer.Probe:input_type -> looprpc.ServerProbeRequest
+	28, // 35: looprpc.SwapServer.RecommendRoutingPlugin:input_type -> looprpc.RecommendRoutingPluginReq
+	30, // 36: looprpc.SwapServer.ReportRoutingResult:input_type -> looprpc.ReportRoutingResultReq
+	32, // 37: looprpc.SwapServer.MuSig2SignSweep:input_type -> looprpc.MuSig2SignSweepReq
+	34, // 38: looprpc.SwapServer.PushKey:input_type -> looprpc.ServerPushKeyReq
+	10, // 39: looprpc.SwapServer.LoopOutTerms:output_type -> looprpc.ServerLoopOutTerms
+	6,  // 40: looprpc.SwapServer.NewLoopOutSwap:output_type -> looprpc.ServerLoopOutResponse
+	18, // 41: looprpc.SwapServer.LoopOutPushPreimage:output_type -> looprpc.ServerLoopOutPushPreimageResponse
+	8,  // 42: looprpc.SwapServer.LoopOutQuote:output_type -> looprpc.ServerLoopOutQuote
+	16, // 43: looprpc.SwapServer.LoopInTerms:output_type -> looprpc.ServerLoopInTerms
+	12, // 44: looprpc.SwapServer.NewLoopInSwap:output_type -> looprpc.ServerLoopInResponse
+	14, // 45: looprpc.SwapServer.LoopInQuote:output_type -> looprpc.ServerLoopInQuoteResponse
+	20, // 46: looprpc.SwapServer.SubscribeLoopOutUpdates:output_type -> looprpc.SubscribeLoopOutUpdatesResponse
+	21, // 47: looprpc.SwapServer.SubscribeLoopInUpdates:output_type -> looprpc.SubscribeLoopInUpdatesResponse
+	25, // 48: looprpc.SwapServer.CancelLoopOutSwap:output_type -> looprpc.CancelLoopOutSwapResponse
+	27, // 49: looprpc.SwapServer.Probe:output_type -> looprpc.ServerProbeResponse
+	29, // 50: looprpc.SwapServer.RecommendRoutingPlugin:output_type -> looprpc.RecommendRoutingPluginRes
+	31, // 51: looprpc.SwapServer.ReportRoutingResult:output_type -> looprpc.ReportRoutingResultRes
+	33, // 52: looprpc.SwapServer.MuSig2SignSweep:output_type -> looprpc.MuSig2SignSweepRes
+	35, // 53: looprpc.SwapServer.PushKey:output_type -> looprpc.ServerPushKeyRes
+	39, // [39:54] is the sub-list for method output_type
+	24, // [24:39] is the sub-list for method input_type
+	24, // [24:24] is the sub-list for extension type_name
+	24, // [24:24] is the sub-list for extension extendee
+	0,  // [0:24] is the sub-list for field type_name
 }
 
 func init() { file_server_proto_init() }
@@ -3308,6 +3461,30 @@ func file_server_proto_init() {
 				return nil
 			}
 		}
+		file_server_proto_msgTypes[29].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*ServerPushKeyReq); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_server_proto_msgTypes[30].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*ServerPushKeyRes); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
 	}
 	file_server_proto_msgTypes[19].OneofWrappers = []interface{}{
 		(*CancelLoopOutSwapRequest_RouteCancel)(nil),
@@ -3318,7 +3495,7 @@ func file_server_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_server_proto_rawDesc,
 			NumEnums:      5,
-			NumMessages:   29,
+			NumMessages:   31,
 			NumExtensions: 0,
 			NumServices:   1,
 		},
diff --git a/swapserverrpc/server.proto b/swapserverrpc/server.proto
index 3b5676a..c684c8f 100644
--- a/swapserverrpc/server.proto
+++ b/swapserverrpc/server.proto
@@ -45,6 +45,8 @@ service SwapServer {
         returns (ReportRoutingResultRes);
 
     rpc MuSig2SignSweep (MuSig2SignSweepReq) returns (MuSig2SignSweepRes);
+
+    rpc PushKey (ServerPushKeyReq) returns (ServerPushKeyRes);
 }
 
 /**
@@ -97,6 +99,9 @@ enum ProtocolVersion {
 
     // The client will use the new v3 (taproot) HTLC scripts.
     HTLC_V3 = 10;
+
+    // Enables MuSig2 signature scheme for swaps.
+    MUSIG2 = 11;
 }
 
 message ServerLoopOutRequest {
@@ -196,14 +201,21 @@ message ServerLoopOutTerms {
 
 message ServerLoopInRequest {
     bytes sender_key = 1;
+
+    bytes sender_internal_pubkey = 9;
+
     bytes swap_hash = 2;
+
     uint64 amt = 3;
+
     string swap_invoice = 4;
+
     bytes last_hop = 5;
 
     /// The protocol version that the client adheres to.
     ProtocolVersion protocol_version = 6;
 
+    // An invoice that can be used for the purpose of probing.
     string probe_invoice = 7;
 
     // The user agent string that identifies the software running on the user's
@@ -218,6 +230,9 @@ message ServerLoopInRequest {
 
 message ServerLoopInResponse {
     bytes receiver_key = 1;
+
+    bytes receiver_internal_pubkey = 9;
+
     int32 expiry = 2;
 
     // A human-readable message from the loop server.
@@ -458,7 +473,7 @@ message CancelLoopOutSwapResponse {
 }
 
 message ServerProbeRequest {
-    /// The protocol version that the client adheres to.
+    // The protocol version that the client adheres to.
     ProtocolVersion protocol_version = 1;
 
     // The probe amount.
@@ -470,9 +485,7 @@ message ServerProbeRequest {
     // Optional last hop to use when probing the client.
     bytes last_hop = 4;
 
-    /*
-    Optional route hints to reach the destination through private channels.
-    */
+    // Optional route hints to reach the destination through private channels.
     repeated RouteHint route_hints = 5;
 }
 
@@ -555,3 +568,17 @@ message MuSig2SignSweepRes {
     // The partial signature of the server for the requested sighash.
     bytes partial_signature = 2;
 }
+
+message ServerPushKeyReq {
+    // The protocol version that the client adheres to.
+    ProtocolVersion protocol_version = 1;
+
+    // The swap hash.
+    bytes swap_hash = 2;
+
+    // The client’s private key used in the HTLC’s aggregated internal key.
+    bytes internal_privkey = 3;
+}
+
+message ServerPushKeyRes {
+}
diff --git a/swapserverrpc/server_grpc.pb.go b/swapserverrpc/server_grpc.pb.go
index d0b3226..75c71ea 100644
--- a/swapserverrpc/server_grpc.pb.go
+++ b/swapserverrpc/server_grpc.pb.go
@@ -32,6 +32,7 @@ type SwapServerClient interface {
 	RecommendRoutingPlugin(ctx context.Context, in *RecommendRoutingPluginReq, opts ...grpc.CallOption) (*RecommendRoutingPluginRes, error)
 	ReportRoutingResult(ctx context.Context, in *ReportRoutingResultReq, opts ...grpc.CallOption) (*ReportRoutingResultRes, error)
 	MuSig2SignSweep(ctx context.Context, in *MuSig2SignSweepReq, opts ...grpc.CallOption) (*MuSig2SignSweepRes, error)
+	PushKey(ctx context.Context, in *ServerPushKeyReq, opts ...grpc.CallOption) (*ServerPushKeyRes, error)
 }
 
 type swapServerClient struct {
@@ -214,6 +215,15 @@ func (c *swapServerClient) MuSig2SignSweep(ctx context.Context, in *MuSig2SignSw
 	return out, nil
 }
 
+func (c *swapServerClient) PushKey(ctx context.Context, in *ServerPushKeyReq, opts ...grpc.CallOption) (*ServerPushKeyRes, error) {
+	out := new(ServerPushKeyRes)
+	err := c.cc.Invoke(ctx, "/looprpc.SwapServer/PushKey", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 // SwapServerServer is the server API for SwapServer service.
 // All implementations must embed UnimplementedSwapServerServer
 // for forward compatibility
@@ -232,6 +242,7 @@ type SwapServerServer interface {
 	RecommendRoutingPlugin(context.Context, *RecommendRoutingPluginReq) (*RecommendRoutingPluginRes, error)
 	ReportRoutingResult(context.Context, *ReportRoutingResultReq) (*ReportRoutingResultRes, error)
 	MuSig2SignSweep(context.Context, *MuSig2SignSweepReq) (*MuSig2SignSweepRes, error)
+	PushKey(context.Context, *ServerPushKeyReq) (*ServerPushKeyRes, error)
 	mustEmbedUnimplementedSwapServerServer()
 }
 
@@ -281,6 +292,9 @@ func (UnimplementedSwapServerServer) ReportRoutingResult(context.Context, *Repor
 func (UnimplementedSwapServerServer) MuSig2SignSweep(context.Context, *MuSig2SignSweepReq) (*MuSig2SignSweepRes, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method MuSig2SignSweep not implemented")
 }
+func (UnimplementedSwapServerServer) PushKey(context.Context, *ServerPushKeyReq) (*ServerPushKeyRes, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method PushKey not implemented")
+}
 func (UnimplementedSwapServerServer) mustEmbedUnimplementedSwapServerServer() {}
 
 // UnsafeSwapServerServer may be embedded to opt out of forward compatibility for this service.
@@ -552,6 +566,24 @@ func _SwapServer_MuSig2SignSweep_Handler(srv interface{}, ctx context.Context, d
 	return interceptor(ctx, in, info, handler)
 }
 
+func _SwapServer_PushKey_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(ServerPushKeyReq)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(SwapServerServer).PushKey(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/looprpc.SwapServer/PushKey",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(SwapServerServer).PushKey(ctx, req.(*ServerPushKeyReq))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 // SwapServer_ServiceDesc is the grpc.ServiceDesc for SwapServer service.
 // It's only intended for direct use with grpc.RegisterService,
 // and not to be introspected or modified (even as a copy)
@@ -607,6 +639,10 @@ var SwapServer_ServiceDesc = grpc.ServiceDesc{
 			MethodName: "MuSig2SignSweep",
 			Handler:    _SwapServer_MuSig2SignSweep_Handler,
 		},
+		{
+			MethodName: "PushKey",
+			Handler:    _SwapServer_PushKey_Handler,
+		},
 	},
 	Streams: []grpc.StreamDesc{
 		{