multi: add p2tr keyspend wallet support

lntest/itest/lnd_remote_signer_test.go

@@ -24,7 +24,7 @@ var (
 
 	accounts = []*lnrpc.WatchOnlyAccount{{
 		Purpose: waddrmgr.KeyScopeBIP0049Plus.Purpose,
-		// We always use the mainnet coin type for our BIP49/84
+		// We always use the mainnet coin type for our BIP49/84/86
 		// addresses!
 		CoinType: 0,
 		Account:  0,
@@ -33,13 +33,22 @@ var (
 			"FPhTq",
 	}, {
 		Purpose: waddrmgr.KeyScopeBIP0084.Purpose,
-		// We always use the mainnet coin type for our BIP49/84
+		// We always use the mainnet coin type for our BIP49/84/86
 		// addresses!
 		CoinType: 0,
 		Account:  0,
 		Xpub: "tpubDDWAWrSLRSFrG1KdqXMQQyTKYGSKLKaY7gxpvK7RdV3e3Dkhvu" +
 			"W2GgsFvsPN4RGmuoYtUgZ1LHZE8oftz7T4mzc1BxGt5rt8zJcVQi" +
 			"KTPPV",
+	}, {
+		Purpose: waddrmgr.KeyScopeBIP0086.Purpose,
+		// We always use the mainnet coin type for our BIP49/84/86
+		// addresses!
+		CoinType: 0,
+		Account:  0,
+		Xpub: "tpubDDtdXpdJFU2zFKWHJwe5M2WtYtcV7qSWtKohT9VP9zarNSwKnm" +
+			"kwDQawsu1vUf9xwXhUDYXbdUqpcrRTn9bLyW4BAVRimZ4K7r5o1J" +
+			"S924u",
 	}}
 )
 

lntest/itest/lnd_taproot_test.go

@@ -0,0 +1,83 @@
+package itest
+
+import (
+	"context"
+
+	"github.com/btcsuite/btcd/btcutil"
+	"github.com/lightningnetwork/lnd/lnrpc"
+	"github.com/lightningnetwork/lnd/lntest"
+	"github.com/stretchr/testify/require"
+)
+
+// testTaproot ensures that the daemon can send to and spend from taproot (p2tr)
+// outputs.
+func testTaproot(net *lntest.NetworkHarness, t *harnessTest) {
+	ctxb := context.Background()
+	ctxt, cancel := context.WithTimeout(ctxb, defaultTimeout)
+	defer cancel()
+
+	// We'll start the test by sending Alice some coins, which she'll use to
+	// send to herself on a p2tr output.
+	net.SendCoins(t.t, btcutil.SatoshiPerBitcoin, net.Alice)
+
+	// Let's create a p2tr address now.
+	p2trResp, err := net.Alice.NewAddress(ctxt, &lnrpc.NewAddressRequest{
+		Type: lnrpc.AddressType_TAPROOT_PUBKEY,
+	})
+	require.NoError(t.t, err)
+
+	// Assert this is a segwit v1 address that starts with bcrt1p.
+	require.Contains(
+		t.t, p2trResp.Address, net.Miner.ActiveNet.Bech32HRPSegwit+"1p",
+	)
+
+	// Send the coins from Alice's wallet to her own, but to the new p2tr
+	// address.
+	_, err = net.Alice.SendCoins(ctxt, &lnrpc.SendCoinsRequest{
+		Addr:   p2trResp.Address,
+		Amount: 0.5 * btcutil.SatoshiPerBitcoin,
+	})
+	require.NoError(t.t, err)
+
+	txid, err := waitForTxInMempool(net.Miner.Client, defaultTimeout)
+	require.NoError(t.t, err)
+
+	// Wait until bob has seen the tx and considers it as owned.
+	p2trOutputIndex := getOutputIndex(t, net.Miner, txid, p2trResp.Address)
+	op := &lnrpc.OutPoint{
+		TxidBytes:   txid[:],
+		OutputIndex: uint32(p2trOutputIndex),
+	}
+	assertWalletUnspent(t, net.Alice, op)
+
+	// Mine a block to clean up the mempool.
+	mineBlocks(t, net, 1, 1)
+
+	// Let's sweep the whole wallet to a new p2tr address, making sure we
+	// can sign transactions with v0 and v1 inputs.
+	p2trResp, err = net.Alice.NewAddress(ctxt, &lnrpc.NewAddressRequest{
+		Type: lnrpc.AddressType_TAPROOT_PUBKEY,
+	})
+	require.NoError(t.t, err)
+
+	_, err = net.Alice.SendCoins(ctxt, &lnrpc.SendCoinsRequest{
+		Addr:    p2trResp.Address,
+		SendAll: true,
+	})
+	require.NoError(t.t, err)
+
+	// Wait until the wallet cleaning sweep tx is found.
+	txid, err = waitForTxInMempool(net.Miner.Client, minerMempoolTimeout)
+	require.NoError(t.t, err)
+
+	// Wait until bob has seen the tx and considers it as owned.
+	p2trOutputIndex = getOutputIndex(t, net.Miner, txid, p2trResp.Address)
+	op = &lnrpc.OutPoint{
+		TxidBytes:   txid[:],
+		OutputIndex: uint32(p2trOutputIndex),
+	}
+	assertWalletUnspent(t, net.Alice, op)
+
+	// Mine another block to clean up the mempool.
+	mineBlocks(t, net, 1, 1)
+}

lntest/itest/lnd_test_list_on_test.go

@@ -387,4 +387,8 @@ var allTestCases = []*testCase{
 		name: "3rd party anchor spend",
 		test: testAnchorThirdPartySpend,
 	},
+	{
+		name: "taproot",
+		test: testTaproot,
+	},
 }