Merge pull request #6263 from guggero/schnorr-taproot-signet

Taproot: integrate btcec/v2 and btcwallet changes to support Taproot key spend paths in lnd's wallet

chainntnfs/txnotifier.go

@@ -39,6 +39,19 @@ var (
 	// notifier to match _and_ dispatch upon detecting the spend of the
 	// script on-chain, rather than the outpoint.
 	ZeroOutPoint wire.OutPoint
+
+	// zeroV1KeyPush is a pkScript that pushes an all-zero 32-byte Taproot
+	// SegWit v1 key to the stack.
+	zeroV1KeyPush = [34]byte{
+		txscript.OP_1, txscript.OP_DATA_32, // 32 byte of zeroes here
+	}
+
+	// ZeroTaprootPkScript is the parsed txscript.PkScript of an empty
+	// Taproot SegWit v1 key being pushed to the stack. This allows the
+	// notifier to match _and_ dispatch upon detecting the spend of the
+	// outpoint on-chain, rather than the pkScript (which cannot be derived
+	// from the witness alone in the SegWit v1 case).
+	ZeroTaprootPkScript, _ = txscript.ParsePkScript(zeroV1KeyPush[:])
 )
 
 var (
@@ -322,6 +335,24 @@ func NewSpendRequest(op *wire.OutPoint, pkScript []byte) (SpendRequest, error) {
 	}
 	r.PkScript = outputScript
 
+	// For Taproot spends we have the main problem that for the key spend
+	// path we cannot derive the pkScript from only looking at the input's
+	// witness. So we need to rely on the outpoint information alone.
+	//
+	// TODO(guggero): For script path spends we can derive the pkScript from
+	// the witness, since we have the full control block and the spent
+	// script available.
+	if outputScript.Class() == txscript.WitnessV1TaprootTy {
+		if op == nil {
+			return r, fmt.Errorf("cannot register witness v1 " +
+				"spend request without outpoint")
+		}
+
+		// We have an outpoint, so we can set the pkScript to an all
+		// zero Taproot key that we'll compare this spend request to.
+		r.PkScript = ZeroTaprootPkScript
+	}
+
 	return r, nil
 }
 
@@ -1488,6 +1519,19 @@ func (n *TxNotifier) filterTx(tx *btcutil.Tx, blockHash *chainhash.Hash,
 			if _, ok := n.spendNotifications[spendRequest]; ok {
 				notifyDetails(spendRequest, prevOut, uint32(i))
 			}
+
+			// Now try with an empty taproot key pkScript, since we
+			// cannot derive the spent pkScript directly from the
+			// witness. But we have the outpoint, which should be
+			// enough.
+			spendRequest.PkScript = ZeroTaprootPkScript
+			if _, ok := n.spendNotifications[spendRequest]; ok {
+				notifyDetails(spendRequest, prevOut, uint32(i))
+			}
+
+			// Restore the pkScript but try with a zero outpoint
+			// instead (won't be possible for Taproot).
+			spendRequest.PkScript = pkScript
 			spendRequest.OutPoint = ZeroOutPoint
 			if _, ok := n.spendNotifications[spendRequest]; ok {
 				notifyDetails(spendRequest, prevOut, uint32(i))

cmd/lncli/commands.go

@@ -139,7 +139,8 @@ var newAddressCommand = cli.Command{
 	Description: `
 	Generate a wallet new address. Address-types has to be one of:
 	    - p2wkh:  Pay to witness key hash
-	    - np2wkh: Pay to nested witness key hash`,
+	    - np2wkh: Pay to nested witness key hash
+	    - p2tr:   Pay to taproot pubkey`,
 	Action: actionDecorator(newAddress),
 }
 
@@ -161,6 +162,8 @@ func newAddress(ctx *cli.Context) error {
 		addrType = lnrpc.AddressType_WITNESS_PUBKEY_HASH
 	case "np2wkh":
 		addrType = lnrpc.AddressType_NESTED_PUBKEY_HASH
+	case "p2tr":
+		addrType = lnrpc.AddressType_TAPROOT_PUBKEY
 	default:
 		return fmt.Errorf("invalid address type %v, support address type "+
 			"are: p2wkh and np2wkh", stringAddrType)

config_builder.go

@@ -1112,7 +1112,14 @@ func importWatchOnlyAccounts(wallet *wallet.Wallet,
 
 	for _, scope := range scopes {
 		addrSchema := waddrmgr.ScopeAddrMap[waddrmgr.KeyScopeBIP0084]
-		if scope.Scope.Purpose == waddrmgr.KeyScopeBIP0049Plus.Purpose {
+
+		// We want witness pubkey hash by default, except for BIP49
+		// where we want mixed and BIP86 where we want taproot address
+		// formats.
+		switch scope.Scope.Purpose {
+		case waddrmgr.KeyScopeBIP0049Plus.Purpose,
+			waddrmgr.KeyScopeBIP0086.Purpose:
+
 			addrSchema = waddrmgr.ScopeAddrMap[scope.Scope]
 		}
 

contractcourt/breacharbiter.go

@@ -1096,11 +1096,15 @@ func (bo *breachedOutput) SignDesc() *input.SignDescriptor {
 // sign descriptor. The method then returns the witness computed by invoking
 // this function on the first and subsequent calls.
 func (bo *breachedOutput) CraftInputScript(signer input.Signer, txn *wire.MsgTx,
-	hashCache *txscript.TxSigHashes, txinIdx int) (*input.Script, error) {
+	hashCache *txscript.TxSigHashes,
+	prevOutputFetcher txscript.PrevOutputFetcher,
+	txinIdx int) (*input.Script, error) {
 
 	// First, we ensure that the witness generation function has been
 	// initialized for this breached output.
-	bo.witnessFunc = bo.witnessType.WitnessGenerator(signer, bo.SignDesc())
+	signDesc := bo.SignDesc()
+	signDesc.PrevOutputFetcher = prevOutputFetcher
+	bo.witnessFunc = bo.witnessType.WitnessGenerator(signer, signDesc)
 
 	// Now that we have ensured that the witness generation function has
 	// been initialized, we can proceed to execute it and generate the
@@ -1397,8 +1401,8 @@ func (b *BreachArbiter) sweepSpendableOutputsTxn(txWeight int64,
 
 	// Compute the total amount contained in the inputs.
 	var totalAmt btcutil.Amount
-	for _, input := range inputs {
-		totalAmt += btcutil.Amount(input.SignDesc().Output.Value)
+	for _, inp := range inputs {
+		totalAmt += btcutil.Amount(inp.SignDesc().Output.Value)
 	}
 
 	// We'll actually attempt to target inclusion within the next two
@@ -1424,10 +1428,10 @@ func (b *BreachArbiter) sweepSpendableOutputsTxn(txWeight int64,
 
 	// Next, we add all of the spendable outputs as inputs to the
 	// transaction.
-	for _, input := range inputs {
+	for _, inp := range inputs {
 		txn.AddTxIn(&wire.TxIn{
-			PreviousOutPoint: *input.OutPoint(),
-			Sequence:         input.BlocksToMaturity(),
+			PreviousOutPoint: *inp.OutPoint(),
+			Sequence:         inp.BlocksToMaturity(),
 		})
 	}
 
@@ -1440,7 +1444,11 @@ func (b *BreachArbiter) sweepSpendableOutputsTxn(txWeight int64,
 
 	// Create a sighash cache to improve the performance of hashing and
 	// signing SigHashAll inputs.
-	hashCache := txscript.NewTxSigHashes(txn)
+	prevOutputFetcher, err := input.MultiPrevOutFetcher(inputs)
+	if err != nil {
+		return nil, err
+	}
+	hashCache := txscript.NewTxSigHashes(txn, prevOutputFetcher)
 
 	// Create a closure that encapsulates the process of initializing a
 	// particular output's witness generation function, computing the
@@ -1452,7 +1460,7 @@ func (b *BreachArbiter) sweepSpendableOutputsTxn(txWeight int64,
 		// transaction using the SpendableOutput's witness generation
 		// function.
 		inputScript, err := so.CraftInputScript(
-			b.cfg.Signer, txn, hashCache, idx,
+			b.cfg.Signer, txn, hashCache, prevOutputFetcher, idx,
 		)
 		if err != nil {
 			return err
@@ -1467,8 +1475,8 @@ func (b *BreachArbiter) sweepSpendableOutputsTxn(txWeight int64,
 
 	// Finally, generate a witness for each output and attach it to the
 	// transaction.
-	for i, input := range inputs {
-		if err := addWitness(i, input); err != nil {
+	for i, inp := range inputs {
+		if err := addWitness(i, inp); err != nil {
 			return nil, err
 		}
 	}
@@ -1648,7 +1656,7 @@ func (ret *retributionInfo) Encode(w io.Writer) error {
 	return nil
 }
 
-// Dencode deserializes a retribution from the passed byte stream.
+// Decode deserializes a retribution from the passed byte stream.
 func (ret *retributionInfo) Decode(r io.Reader) error {
 	var scratch [32]byte
 

contractcourt/breacharbiter_test.go

@@ -1377,7 +1377,7 @@ func getSpendTransactions(signer input.Signer, chanPoint *wire.OutPoint,
 	// sign and add the witness to the HTLC sweep.
 	retInfo := newRetributionInfo(chanPoint, retribution)
 
-	hashCache := txscript.NewTxSigHashes(htlcSweep)
+	hashCache := input.NewTxSigHashesV0Only(htlcSweep)
 	for i := range retInfo.breachedOutputs {
 		inp := &retInfo.breachedOutputs[i]
 
@@ -1386,8 +1386,11 @@ func getSpendTransactions(signer input.Signer, chanPoint *wire.OutPoint,
 		case input.HtlcAcceptedRevoke:
 			fallthrough
 		case input.HtlcOfferedRevoke:
+			cannedFetcher := txscript.NewCannedPrevOutputFetcher(
+				nil, 0,
+			)
 			inputScript, err := inp.CraftInputScript(
-				signer, htlcSweep, hashCache, 0,
+				signer, htlcSweep, hashCache, cannedFetcher, 0,
 			)
 			if err != nil {
 				return nil, err

docs/release-notes/release-notes-0.15.0.md

@@ -5,6 +5,15 @@
 * [Misconfigured ZMQ
   setup now gets reported](https://github.com/lightningnetwork/lnd/pull/5710).
 
+## Taproot
+
+The internal on-chain wallet of `lnd` is now able to create and spend from
+[Taproot (SegWit v1)
+addresses](https://github.com/lightningnetwork/lnd/pull/6263). Using
+`lncli newaddress p2tr` will create a new BIP-0086 keyspend only address and
+then watch it on chain. Taproot script spends are also supported through the
+`signrpc.SignOutputRaw` RPC (`/v2/signer/signraw` in REST).
+
 ## `lncli`
 
 * Add [auto-generated command-line completions](https://github.com/lightningnetwork/lnd/pull/4177) 

go.mod

@@ -4,15 +4,16 @@ require (
 	github.com/NebulousLabs/fastrand v0.0.0-20181203155948-6fb6489aac4e // indirect
 	github.com/NebulousLabs/go-upnp v0.0.0-20180202185039-29b680b06c82
 	github.com/Yawning/aez v0.0.0-20211027044916-e49e68abd344
-	github.com/btcsuite/btcd v0.22.0-beta.0.20220207191057-4dc4ff7963b4
-	github.com/btcsuite/btcd/btcec/v2 v2.1.0
-	github.com/btcsuite/btcd/btcutil v1.1.0
-	github.com/btcsuite/btcd/btcutil/psbt v1.1.0
+	github.com/btcsuite/btcd v0.22.0-beta.0.20220316175102-8d5c75c28923
+	github.com/btcsuite/btcd/btcec/v2 v2.1.3
+	github.com/btcsuite/btcd/btcutil v1.1.1
+	github.com/btcsuite/btcd/btcutil/psbt v1.1.1
+	github.com/btcsuite/btcd/chaincfg/chainhash v1.0.1
 	github.com/btcsuite/btclog v0.0.0-20170628155309-84c8d2346e9f
-	github.com/btcsuite/btcwallet v0.14.0
-	github.com/btcsuite/btcwallet/wallet/txauthor v1.2.1
+	github.com/btcsuite/btcwallet v0.14.1-0.20220322182735-b0001c262734
+	github.com/btcsuite/btcwallet/wallet/txauthor v1.2.3
 	github.com/btcsuite/btcwallet/wallet/txrules v1.2.0
-	github.com/btcsuite/btcwallet/walletdb v1.3.6-0.20210803004036-eebed51155ec
+	github.com/btcsuite/btcwallet/walletdb v1.4.0
 	github.com/btcsuite/btcwallet/wtxmgr v1.5.0
 	github.com/coreos/go-systemd v0.0.0-20190719114852-fd7a80b32e1f
 	github.com/davecgh/go-spew v1.1.1

go.sum

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@@ -631,6 +638,8 @@ github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/
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