derivekey+genimportscript: add p2tr address support

Author: guggero

btc/bitcoind.go

@@ -209,11 +209,15 @@ func (i *ImportWallet) Format(hdKey *hdkeychain.ExtendedKey,
 	if err != nil {
 		return "", fmt.Errorf("could not create address: %w", err)
 	}
+	addrP2TR, err := lnd.P2TRAddr(privKey.PubKey(), params)
+	if err != nil {
+		return "", fmt.Errorf("could not create address: %w", err)
+	}
 
 	return fmt.Sprintf("%s 1970-01-01T00:00:01Z label=%s/%d/%d/ "+
-		"# addr=%s,%s,%s", wif.String(), path, branch, index,
+		"# addr=%s,%s,%s,%s", wif.String(), path, branch, index,
 		addrP2PKH.EncodeAddress(), addrNP2WKH.EncodeAddress(),
-		addrP2WKH.EncodeAddress(),
+		addrP2WKH.EncodeAddress(), addrP2TR.EncodeAddress(),
 	), nil
 }
 

cmd/chantools/derivekey.go

@@ -2,7 +2,6 @@ package main
 
 import (
 	"fmt"
-
 	"github.com/btcsuite/btcd/btcutil"
 	"github.com/btcsuite/btcd/btcutil/hdkeychain"
 	"github.com/guggero/chantools/lnd"
@@ -16,6 +15,7 @@ Public key: 			%x
 Extended public key (xpub): 	%v
 Address: 			%v
 Legacy address: 		%v
+Taproot address:                %v
 Private key (WIF): 		%s
 Extended private key (xprv):	%s
 `
@@ -99,6 +99,11 @@ func deriveKey(extendedKey *hdkeychain.ExtendedKey, path string,
 		return fmt.Errorf("could not create address: %w", err)
 	}
 
+	addrP2TR, err := lnd.P2TRAddr(pubKey, chainParams)
+	if err != nil {
+		return fmt.Errorf("could not create address: %w", err)
+	}
+
 	privKey, xPriv := na, na
 	if !neuter {
 		privKey, xPriv = wif.String(), child.String()
@@ -107,7 +112,7 @@ func deriveKey(extendedKey *hdkeychain.ExtendedKey, path string,
 	result := fmt.Sprintf(
 		deriveKeyFormat, path, chainParams.Name,
 		pubKey.SerializeCompressed(), neutered, addrP2WKH, addrP2PKH,
-		privKey, xPriv,
+		addrP2TR, privKey, xPriv,
 	)
 	fmt.Println(result)
 

cmd/chantools/root.go

@@ -26,7 +26,7 @@ import (
 
 const (
 	defaultAPIURL = "https://blockstream.info/api"
-	version       = "0.10.5"
+	version       = "0.10.6"
 	na            = "n/a"
 
 	Commit = ""

lnd/hdkeychain.go

@@ -3,6 +3,7 @@ package lnd
 import (
 	"crypto/sha256"
 	"fmt"
+	"github.com/btcsuite/btcd/btcec/v2/schnorr"
 	"strconv"
 	"strings"
 
@@ -21,6 +22,7 @@ const (
 	HardenedKeyStart            = uint32(hdkeychain.HardenedKeyStart)
 	WalletDefaultDerivationPath = "m/84'/0'/0'"
 	WalletBIP49DerivationPath   = "m/49'/0'/0'"
+	WalletBIP86DerivationPath   = "m/86'/0'/0'"
 	LndDerivationPath           = "m/1017'/%d'/%d'"
 )
 
@@ -199,6 +201,7 @@ func AllDerivationPaths(params *chaincfg.Params) ([]string, [][]uint32, error) {
 	pathStrings := []string{
 		WalletBIP49DerivationPath,
 		WalletDefaultDerivationPath,
+		WalletBIP86DerivationPath,
 		mkPath(keychain.KeyFamilyPaymentBase),
 	}
 	paths := make([][]uint32, len(pathStrings))
@@ -350,6 +353,15 @@ func NP2WKHAddr(pubKey *btcec.PublicKey,
 	return btcutil.NewAddressScriptHash(script, params)
 }
 
+func P2TRAddr(pubKey *btcec.PublicKey,
+	params *chaincfg.Params) (*btcutil.AddressTaproot, error) {
+
+	taprootKey := txscript.ComputeTaprootKeyNoScript(pubKey)
+	return btcutil.NewAddressTaproot(
+		schnorr.SerializePubKey(taprootKey), params,
+	)
+}
+
 func P2AnchorStaticRemote(pubKey *btcec.PublicKey,
 	params *chaincfg.Params) (*btcutil.AddressWitnessScriptHash, []byte,
 	error) {