lwwallet: reduce browser wallet public KDF cost

go.mod

@@ -236,3 +236,6 @@ replace google.golang.org/protobuf => github.com/lightninglabs/protobuf-go-hex-d
 
 // Use local baselib for development and CI.
 replace github.com/lightninglabs/wavelength/baselib => ./baselib
+
+// Use the independent creation KDF API until btcwallet PR #1298 merges.
+replace github.com/btcsuite/btcwallet => github.com/Roasbeef/btcwallet v0.0.0-20260724000651-fa5ec465bbf7

go.sum

@@ -611,6 +611,8 @@ github.com/Microsoft/go-winio v0.6.2/go.mod h1:yd8OoFMLzJbo9gZq8j5qaps8bJ9aShtEA
 github.com/Nvveen/Gotty v0.0.0-20120604004816-cd527374f1e5 h1:TngWCqHvy9oXAN6lEVMRuU21PR1EtLVZJmdB18Gu3Rw=
 github.com/Nvveen/Gotty v0.0.0-20120604004816-cd527374f1e5/go.mod h1:lmUJ/7eu/Q8D7ML55dXQrVaamCz2vxCfdQBasLZfHKk=
 github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
+github.com/Roasbeef/btcwallet v0.0.0-20260724000651-fa5ec465bbf7 h1:YU1tt+gw8Fl1O9UHi9MP7OkhZGtnbmvYYEjBp+UQHE4=
+github.com/Roasbeef/btcwallet v0.0.0-20260724000651-fa5ec465bbf7/go.mod h1:1ZMc1EEskov+AKKv4kCMZqN8BwVh9rpXwEyxbeWy2A4=
 github.com/Yawning/aez v0.0.0-20211027044916-e49e68abd344 h1:cDVUiFo+npB0ZASqnw4q90ylaVAbnYyx0JYqK4YcGok=
 github.com/Yawning/aez v0.0.0-20211027044916-e49e68abd344/go.mod h1:9pIqrY6SXNL8vjRQE5Hd/OL5GyK/9MrGUWs87z/eFfk=
 github.com/aead/chacha20 v0.0.0-20180709150244-8b13a72661da h1:KjTM2ks9d14ZYCvmHS9iAKVt9AyzRSqNU1qabPih5BY=
@@ -658,8 +660,6 @@ github.com/btcsuite/btclog v1.0.0 h1:sEkpKJMmfGiyZjADwEIgB1NSwMyfdD1FB8v6+w1T0Ns
 github.com/btcsuite/btclog v1.0.0/go.mod h1:w7xnGOhwT3lmrS4H3b/D1XAXxvh+tbhUm8xeHN2y3TQ=
 github.com/btcsuite/btclog/v2 v2.0.1-0.20250728225537-6090e87c6c5b h1:MQ+Q6sDy37V1wP1Yu79A5KqJutolqUGwA99UZWQDWZM=
 github.com/btcsuite/btclog/v2 v2.0.1-0.20250728225537-6090e87c6c5b/go.mod h1:XItGUfVOxotJL8kkuk2Hj3EVow5KCugXl3wWfQ6K0AE=
-github.com/btcsuite/btcwallet v0.18.0 h1:VSRClNLT7NX0wmJEGALz3jOZRRjWPpUdp7VI1Akie1o=
-github.com/btcsuite/btcwallet v0.18.0/go.mod h1:1ZMc1EEskov+AKKv4kCMZqN8BwVh9rpXwEyxbeWy2A4=
 github.com/btcsuite/btcwallet/wallet/txauthor v1.4.0 h1:oIkGj32YK1CvWaJGlVwZA1f+y/KVHkfrd2PoST0ZpQs=
 github.com/btcsuite/btcwallet/wallet/txauthor v1.4.0/go.mod h1:sGrBjcqQ8UPexuRajFs72+o544CJn3Pavv/5H0VAWVk=
 github.com/btcsuite/btcwallet/wallet/txrules v1.3.0 h1:D5aGMwWIxdqek3xEJs4eOdMoh6iga2EI2xSlaXCdnNo=

lwwallet/wallet.go

@@ -155,7 +155,7 @@ func New(cfg Config) (*Wallet, error) {
 		walletcore.DefaultBlockCacheSize,
 	)
 
-	loaderOptions, loaderCleanup, err := newWalletLoaderOptions(cfg)
+	baseWallet, loaderOptions, loaderCleanup, err := newWalletBootstrap(cfg)
 	if err != nil {
 		return nil, fmt.Errorf("create wallet loader options: %w", err)
 	}
@@ -170,6 +170,7 @@ func New(cfg Config) (*Wallet, error) {
 		CoinType:       coinType,
 		RecoveryWindow: cfg.RecoveryWindow,
 		LoaderOptions:  loaderOptions,
+		Wallet:         baseWallet,
 	}, blockCache)
 	if err != nil {
 		// On failure the wallet never adopted the loader's
@@ -179,7 +180,6 @@ func New(cfg Config) (*Wallet, error) {
 
 		return nil, fmt.Errorf("create btcwallet: %w", err)
 	}
-
 	// Create the keyring from btcwallet's internal wallet. This
 	// provides HD key derivation using the same m/1017'/coinType'
 	// scope as LND.

lwwallet/walletdb_native.go

@@ -5,9 +5,23 @@ package lwwallet
 import (
 	"time"
 
+	base "github.com/btcsuite/btcwallet/wallet"
 	"github.com/lightningnetwork/lnd/lnwallet/btcwallet"
 )
 
+// newWalletBootstrap leaves wallet creation and opening to lnd's native
+// btcwallet loader.
+func newWalletBootstrap(cfg Config) (*base.Wallet, []btcwallet.LoaderOption,
+	func(), error) {
+
+	opts, cleanup, err := newWalletLoaderOptions(cfg)
+	if err != nil {
+		return nil, nil, nil, err
+	}
+
+	return nil, opts, cleanup, nil
+}
+
 // newWalletLoaderOptions returns the native btcwallet bbolt loader
 // options. The cleanup func is a no-op: the local database is opened
 // (and closed on failure) by btcwallet's own loader.

lwwallet/walletdb_wasm.go

@@ -11,9 +11,12 @@ import (
 	"strings"
 	"time"
 
+	"github.com/btcsuite/btcwallet/waddrmgr"
+	base "github.com/btcsuite/btcwallet/wallet"
 	"github.com/btcsuite/btcwallet/walletdb"
 	_ "github.com/lightninglabs/go-wasmsqlite"
 	"github.com/lightninglabs/wavelength/internal/sqlbase"
+	"github.com/lightninglabs/wavelength/walletcore"
 	"github.com/lightningnetwork/lnd/lnwallet/btcwallet"
 )
 
@@ -26,6 +29,61 @@ const (
 	wasmWalletDBFileNamePattern = "/wallet-%016x.db"
 )
 
+var browserPublicScrypt = waddrmgr.ScryptOptions{
+	N: 16,
+	R: 8,
+	P: 1,
+}
+
+// newWalletBootstrap opens the browser wallet directly so Wavelength can
+// select independent public and private KDF profiles. The public passphrase is
+// fixed and protects non-secret metadata, so it uses the fast profile. The
+// private passphrase keeps btcwallet's default profile.
+func newWalletBootstrap(cfg Config) (*base.Wallet,
+	[]btcwallet.LoaderOption, func(), error) {
+
+	opts, cleanup, err := newWalletLoaderOptions(cfg)
+	if err != nil {
+		return nil, nil, nil, err
+	}
+	loader, err := btcwallet.NewWalletLoader(
+		cfg.ChainParams, cfg.RecoveryWindow, opts...,
+	)
+	if err != nil {
+		cleanup()
+
+		return nil, nil, nil, err
+	}
+	err = loader.SetCreateScryptOptions(
+		&browserPublicScrypt,
+		&waddrmgr.DefaultScryptOptions,
+	)
+	if err != nil {
+		cleanup()
+
+		return nil, nil, nil, err
+	}
+
+	var wallet *base.Wallet
+	if cfg.Seed != nil {
+		wallet, err = loader.CreateNewWallet(
+			walletcore.PublicWalletPassphrase, cfg.WalletPassword,
+			cfg.Seed, cfg.Birthday,
+		)
+	} else {
+		wallet, err = loader.OpenExistingWallet(
+			walletcore.PublicWalletPassphrase, false,
+		)
+	}
+	if err != nil {
+		cleanup()
+
+		return nil, nil, nil, err
+	}
+
+	return wallet, nil, cleanup, nil
+}
+
 // newWalletLoaderOptions opens btcwallet through an OPFS-backed SQLite
 // walletdb implementation for browser builds. The cleanup func closes
 // the just-opened database handle: btcwallet's loader only closes