multi-account: support BIP44 account discovery

waddrmgr/manager.go

@@ -42,6 +42,9 @@ const (
 	// ImportedAddrAccountName is the name of the imported account.
 	ImportedAddrAccountName = "imported"
 
+	// AccountGapLimit is used for account discovery defined in BIP0044
+	AccountGapLimit = 20
+
 	// DefaultAccountNum is the number of the default account.
 	DefaultAccountNum = 0
 
@@ -1527,7 +1530,7 @@ func createManagerKeyScope(ns walletdb.ReadWriteBucket,
 
 	// Derive the account key for the first account according our
 	// BIP0044-like derivation.
-	acctKeyPriv, err := deriveAccountKey(coinTypeKeyPriv, 0)
+	acctKeyPriv, err := deriveAccountKey(coinTypeKeyPriv, DefaultAccountNum)
 	if err != nil {
 		// The seed is unusable if the any of the children in the
 		// required hierarchy can't be derived due to invalid child.

waddrmgr/scoped_manager.go

@@ -116,13 +116,17 @@ type KeyScope struct {
 // identify a particular child key, when the account and branch can be inferred
 // from context.
 type ScopedIndex struct {
-	// Scope is the BIP44 account' used to derive the child key.
 	Scope   KeyScope
-
+	Account uint32
-	// Index is the BIP44 address_index used to derive the child key.
+	Branch  uint32
 	Index   uint32
 }
 
+func (i ScopedIndex) String() string {
+	return fmt.Sprintf("%s/%d'/%d/%d",
+		i.Scope, i.Account, i.Branch, i.Index)
+}
+
 // String returns a human readable version describing the keypath encapsulated
 // by the target key scope.
 func (k KeyScope) String() string {
@@ -625,6 +629,14 @@ func (s *ScopedKeyManager) DeriveFromKeyPathCache(
 	return privKey, nil
 }
 
+func (s *ScopedKeyManager) DeriveFromExtKeys(kp DerivationPath,
+	derivedKey *hdkeychain.ExtendedKey,
+	addrType AddressType) (ManagedAddress, error) {
+	return newManagedAddressFromExtKey(
+		s, kp, derivedKey, addrType,
+	)
+}
+
 // DeriveFromKeyPath attempts to derive a maximal child key (under the BIP0044
 // scheme) from a given key path. If key derivation isn't possible, then an
 // error will be returned.
@@ -1105,11 +1117,28 @@ func (s *ScopedKeyManager) nextAddresses(ns walletdb.ReadWriteBucket,
 //
 // This function MUST be called with the manager lock held for writes.
 func (s *ScopedKeyManager) extendAddresses(ns walletdb.ReadWriteBucket,
-	account uint32, lastIndex uint32, internal bool) error {
+	account uint32, branch uint32, lastIndex uint32) error {
 
 	// The next address can only be generated for accounts that have
 	// already been created.
 	acctInfo, err := s.loadAccountInfo(ns, account)
+	if err != nil {
+		err = s.newAccount(ns, account, fmt.Sprintf("act:%v", account))
+		if err != nil {
+			return err
+		}
+		for gapAccount := account - 1; gapAccount >= 0; gapAccount-- {
+			_, err = s.loadAccountInfo(ns, gapAccount)
+			if err == nil {
+				break
+			}
+			err = s.newAccount(ns, gapAccount, fmt.Sprintf("act:%v", gapAccount))
+			if err != nil {
+				return err
+			}
+		}
+	}
+	acctInfo, err = s.loadAccountInfo(ns, account)
 	if err != nil {
 		return err
 	}
@@ -1472,10 +1501,42 @@ func (s *ScopedKeyManager) newAccount(ns walletdb.ReadWriteBucket,
 		return err
 	}
 
+	lastAccount, err := fetchLastAccount(ns, &s.scope)
+	if account < lastAccount {
+		return nil
+	}
+
 	// Save last account metadata
 	return putLastAccount(ns, &s.scope, account)
 }
 
+func (s *ScopedKeyManager) DeriveAccountKey(ns walletdb.ReadWriteBucket,
+	account uint32) (*hdkeychain.ExtendedKey, error) {
+
+	_, coinTypePrivEnc, err := fetchCoinTypeKeys(ns, &s.scope)
+	if err != nil {
+		return nil, err
+	}
+
+	// Decrypt the cointype key.
+	serializedKeyPriv, err := s.rootManager.cryptoKeyPriv.Decrypt(coinTypePrivEnc)
+	if err != nil {
+		str := fmt.Sprintf("failed to decrypt cointype serialized private key")
+		return nil, managerError(ErrLocked, str, err)
+	}
+	defer zero.Bytes(serializedKeyPriv)
+
+	coinTypeKeyPriv, err := hdkeychain.NewKeyFromString(string(serializedKeyPriv))
+	if err != nil {
+		str := fmt.Sprintf("failed to create cointype extended private key")
+		return nil, managerError(ErrKeyChain, str, err)
+	}
+	defer coinTypeKeyPriv.Zero()
+
+	// Derive the account key using the cointype key
+	return deriveAccountKey(coinTypeKeyPriv, account)
+}
+
 // RenameAccount renames an account stored in the manager based on the given
 // account number with the given name.  If an account with the same name
 // already exists, ErrDuplicateAccount will be returned.

wallet/recovery.go

@@ -63,66 +63,45 @@ func (rm *RecoveryManager) Resurrect(ns walletdb.ReadBucket,
 	// First, for each scope that we are recovering, rederive all of the
 	// addresses up to the last found address known to each branch.
 	for keyScope, scopedMgr := range scopedMgrs {
-		// Load the current account properties for this scope, using the
+
-		// the default account number.
-		// TODO(conner): rescan for all created accounts if we allow
-		// users to use non-default address
 		scopeState := rm.state.StateForScope(keyScope)
-		acctProperties, err := scopedMgr.AccountProperties(
+
-			ns, waddrmgr.DefaultAccountNum,
+		lastAccount, err := scopedMgr.LastAccount(ns)
-		)
 		if err != nil {
 			return err
 		}
 
-		// Fetch the external key count, which bounds the indexes we
+		for accountIndex, accountState := range scopeState[:lastAccount+1] {
-		// will need to rederive.
+			log.Infof("Resurrecting addresses for key scope %v, account %v", keyScope, accountIndex)
-		externalCount := acctProperties.ExternalKeyCount
+			acctProperties, err := scopedMgr.AccountProperties(ns,
+				uint32(accountIndex))
+			if err != nil {
+				return err
+			}
 
-		// Walk through all indexes through the last external key,
+			// Fetch the key count, which bounds the indexes we
-		// deriving each address and adding it to the external branch
+			// will need to rederive.
+			counts := []uint32{
+				acctProperties.ExternalKeyCount,
+				acctProperties.InternalKeyCount,
+			}
+
+			for branchIndex, branchState := range accountState {
+				// Walk through all indexes through the last key,
+				// deriving each address and adding it to the branch
 				// recovery state's set of addresses to look for.
-		for i := uint32(0); i < externalCount; i++ {
+				for addrIndex := uint32(0); addrIndex < counts[branchIndex]; addrIndex++ {
-			keyPath := externalKeyPath(i)
+					keyPath := keyPath(uint32(accountIndex), uint32(branchIndex), addrIndex)
 					addr, err := scopedMgr.DeriveFromKeyPath(ns, keyPath)
 					if err != nil && err != hdkeychain.ErrInvalidChild {
 						return err
 					} else if err == hdkeychain.ErrInvalidChild {
-				scopeState.ExternalBranch.MarkInvalidChild(i)
+						branchState.MarkInvalidChild(addrIndex)
 						continue
 					}
-
+					branchState.AddAddr(addrIndex, addr.Address())
-			scopeState.ExternalBranch.AddAddr(i, addr.Address())
 				}
-
-		// Fetch the internal key count, which bounds the indexes we
-		// will need to rederive.
-		internalCount := acctProperties.InternalKeyCount
-
-		// Walk through all indexes through the last internal key,
-		// deriving each address and adding it to the internal branch
-		// recovery state's set of addresses to look for.
-		for i := uint32(0); i < internalCount; i++ {
-			keyPath := internalKeyPath(i)
-			addr, err := scopedMgr.DeriveFromKeyPath(ns, keyPath)
-			if err != nil && err != hdkeychain.ErrInvalidChild {
-				return err
-			} else if err == hdkeychain.ErrInvalidChild {
-				scopeState.InternalBranch.MarkInvalidChild(i)
-				continue
 			}
-
-			scopeState.InternalBranch.AddAddr(i, addr.Address())
-		}
-
-		// The key counts will point to the next key that can be
-		// derived, so we subtract one to point to last known key. If
-		// the key count is zero, then no addresses have been found.
-		if externalCount > 0 {
-			scopeState.ExternalBranch.ReportFound(externalCount - 1)
-		}
-		if internalCount > 0 {
-			scopeState.InternalBranch.ReportFound(internalCount - 1)
 		}
 	}
 
@@ -202,7 +181,7 @@ type RecoveryState struct {
 
 	// scopes maintains a map of each requested key scope to its active
 	// RecoveryState.
-	scopes map[waddrmgr.KeyScope]*ScopeRecoveryState
+	scopes map[waddrmgr.KeyScope]ScopeRecoveryState
 
 	// watchedOutPoints contains the set of all outpoints known to the
 	// wallet. This is updated iteratively as new outpoints are found during
@@ -214,7 +193,7 @@ type RecoveryState struct {
 // recoveryWindow. Each RecoveryState that is subsequently initialized for a
 // particular key scope will receive the same recoveryWindow.
 func NewRecoveryState(recoveryWindow uint32) *RecoveryState {
-	scopes := make(map[waddrmgr.KeyScope]*ScopeRecoveryState)
+	scopes := make(map[waddrmgr.KeyScope]ScopeRecoveryState)
 
 	return &RecoveryState{
 		recoveryWindow:   recoveryWindow,
@@ -227,18 +206,21 @@ func NewRecoveryState(recoveryWindow uint32) *RecoveryState {
 // does not already exist, a new one will be generated with the RecoveryState's
 // recoveryWindow.
 func (rs *RecoveryState) StateForScope(
-	keyScope waddrmgr.KeyScope) *ScopeRecoveryState {
+	keyScope waddrmgr.KeyScope) ScopeRecoveryState {
 
-	// If the account recovery state already exists, return it.
+	scopeState, ok := rs.scopes[keyScope]
-	if scopeState, ok := rs.scopes[keyScope]; ok {
+	if !ok {
-		return scopeState
+		for i := 0; i < waddrmgr.AccountGapLimit; i++ {
+			accountState := []*BranchRecoveryState{
+				NewBranchRecoveryState(rs.recoveryWindow),
+				NewBranchRecoveryState(rs.recoveryWindow),
+			}
+			scopeState = append(scopeState, accountState)
+		}
+		rs.scopes[keyScope] = scopeState
 	}
 
-	// Otherwise, initialize the recovery state for this scope with the
+	return scopeState
-	// chosen recovery window.
-	rs.scopes[keyScope] = NewScopeRecoveryState(rs.recoveryWindow)
-
-	return rs.scopes[keyScope]
 }
 
 // WatchedOutPoints returns the global set of outpoints that are known to belong
@@ -256,22 +238,11 @@ func (rs *RecoveryState) AddWatchedOutPoint(outPoint *wire.OutPoint,
 }
 
 // ScopeRecoveryState is used to manage the recovery of addresses generated
-// under a particular BIP32 account. Each account tracks both an external and
+// under a BIP32 accounts. Each account tracks both an external and internal
-// internal branch recovery state, both of which use the same recovery window.
+// branch recovery state, both of which use the same recovery window.
-type ScopeRecoveryState struct {
+type ScopeRecoveryState []AccountRecoveryState
-	// ExternalBranch is the recovery state of addresses generated for
-	// external use, i.e. receiving addresses.
-	AccountBranches [][2]*BranchRecoveryState
-}
 
-// NewScopeRecoveryState initializes an ScopeRecoveryState with the chosen
+type AccountRecoveryState []*BranchRecoveryState
-// recovery window.
-func NewScopeRecoveryState(recoveryWindow uint32) *ScopeRecoveryState {
-	return &ScopeRecoveryState{
-		ExternalBranch: NewBranchRecoveryState(recoveryWindow),
-		InternalBranch: NewBranchRecoveryState(recoveryWindow),
-	}
-}
 
 // BranchRecoveryState maintains the required state in-order to properly
 // recover addresses derived from a particular account's internal or external

wallet/wallet.go

@@ -26,6 +26,7 @@ import (
 	btcutil "github.com/lbryio/lbcutil"
 	"github.com/lbryio/lbcutil/hdkeychain"
 	"github.com/lbryio/lbcwallet/chain"
+	"github.com/lbryio/lbcwallet/internal/prompt"
 	"github.com/lbryio/lbcwallet/waddrmgr"
 	"github.com/lbryio/lbcwallet/wallet/txauthor"
 	"github.com/lbryio/lbcwallet/wallet/txrules"
@@ -666,16 +667,13 @@ func (w *Wallet) recovery(chainClient chain.Interface,
 		w.recoveryWindow, recoveryBatchSize, w.chainParams,
 	)
 
-	// In the event that this recovery is being resumed, we will need to
-	// repopulate all found addresses from the database. Ideally, for basic
-	// recovery, we would only do so for the default scopes, but due to a
-	// bug in which the wallet would create change addresses outside of the
-	// default scopes, it's necessary to attempt all registered key scopes.
 	scopedMgrs := make(map[waddrmgr.KeyScope]*waddrmgr.ScopedKeyManager)
 	for _, scopedMgr := range w.Manager.ActiveScopedKeyManagers() {
 		scopedMgrs[scopedMgr.Scope()] = scopedMgr
 	}
+
 	err := walletdb.View(w.db, func(tx walletdb.ReadTx) error {
+		var credits []wtxmgr.Credit
 		txMgrNS := tx.ReadBucket(wtxmgrNamespaceKey)
 		credits, err := w.TxStore.UnspentOutputs(txMgrNS)
 		if err != nil {
@@ -704,6 +702,18 @@ func (w *Wallet) recovery(chainClient chain.Interface,
 	// NOTE: We purposefully don't update our best height since we assume
 	// that a wallet rescan will be performed from the wallet's tip, which
 	// will be of bestHeight after completing the recovery process.
+
+	pass, err := prompt.ProvidePrivPassphrase()
+	if err != nil {
+		return err
+	}
+
+	err = w.Unlock(pass, nil)
+	if err != nil {
+		return err
+	}
+	defer w.Lock()
+
 	var blocks []*waddrmgr.BlockStamp
 	startHeight := w.Manager.SyncedTo().Height + 1
 	for height := startHeight; height <= bestHeight; height++ {
@@ -735,18 +745,27 @@ func (w *Wallet) recovery(chainClient chain.Interface,
 		// the recovery batch size, so we can proceed to commit our
 		// state to disk.
 		recoveryBatch := recoveryMgr.BlockBatch()
-		if len(recoveryBatch) == recoveryBatchSize || height == bestHeight {
+		if len(recoveryBatch) != recoveryBatchSize && height != bestHeight {
-			err := walletdb.Update(w.db, func(tx walletdb.ReadWriteTx) error {
+			continue
+		}
+
+		err = walletdb.Update(w.db, func(tx walletdb.ReadWriteTx) error {
 			ns := tx.ReadWriteBucket(waddrmgrNamespaceKey)
 			for _, block := range blocks {
-					err := w.Manager.SetSyncedTo(ns, block)
+				err = w.Manager.SetSyncedTo(ns, block)
 				if err != nil {
 					return err
 				}
 			}
-				return w.recoverScopedAddresses(
+			for scope, scopedMgr := range scopedMgrs {
-					chainClient, tx, ns, recoveryBatch,
+				scopeState := recoveryMgr.State().StateForScope(scope)
-					recoveryMgr.State(), scopedMgrs,
+				err = expandScopeHorizons(ns, scopedMgr, scopeState)
+				if err != nil {
+					return err
+				}
+			}
+			return w.recoverScopedAddresses(chainClient, tx, ns,
+				recoveryBatch, recoveryMgr.State(), scopedMgrs,
 			)
 		})
 		if err != nil {
@@ -764,7 +783,6 @@ func (w *Wallet) recovery(chainClient chain.Interface,
 		blocks = blocks[:0]
 		recoveryMgr.ResetBlockBatch()
 	}
-	}
 
 	return nil
 }
@@ -795,16 +813,8 @@ func (w *Wallet) recoverScopedAddresses(
 		return nil
 	}
 
-	log.Infof("Scanning %d blocks for recoverable addresses", len(batch))
-
 expandHorizons:
-	for scope, scopedMgr := range scopedMgrs {
+	log.Infof("Scanning %d blocks for recoverable addresses", len(batch))
-		scopeState := recoveryState.StateForScope(scope)
-		err := expandScopeHorizons(ns, scopedMgr, scopeState)
-		if err != nil {
-			return err
-		}
-	}
 
 	// With the internal and external horizons properly expanded, we now
 	// construct the filter blocks request. The request includes the range
@@ -887,74 +897,55 @@ expandHorizons:
 // persistent state of the wallet. If any invalid child keys are detected, the
 // horizon will be properly extended such that our lookahead always includes the
 // proper number of valid child keys.
-func expandScopeHorizons(ns walletdb.ReadWriteBucket,
+func expandScopeHorizons(
+	ns walletdb.ReadWriteBucket,
 	scopedMgr *waddrmgr.ScopedKeyManager,
-	scopeState *ScopeRecoveryState) error {
+	scopeState ScopeRecoveryState) error {
+
+	for accountIndex, accountState := range scopeState {
+		acctKey, err := scopedMgr.DeriveAccountKey(ns, uint32(accountIndex))
+		if err != nil {
+			return err
+		}
+		for branchIndex, branchState := range accountState {
+			exHorizon, exWindow := branchState.ExtendHorizon()
+			count, addrIndex := uint32(0), exHorizon
+
+			branchKey, err := acctKey.Derive(uint32(branchIndex))
+			if err != nil {
+				return err
+			}
 
-	// Compute the current external horizon and the number of addresses we
-	// must derive to ensure we maintain a sufficient recovery window for
-	// the external branch.
-	exHorizon, exWindow := scopeState.ExternalBranch.ExtendHorizon()
-	count, childIndex := uint32(0), exHorizon
 			for count < exWindow {
-		keyPath := externalKeyPath(childIndex)
+				kp := keyPath(uint32(accountIndex), uint32(branchIndex), addrIndex)
-		addr, err := scopedMgr.DeriveFromKeyPath(ns, keyPath)
+				indexKey, err := branchKey.Derive(addrIndex)
+				if err != nil {
+					return err
+				}
+				addrType := waddrmgr.ScopeAddrMap[scopedMgr.Scope()].ExternalAddrType
+				addr, err := scopedMgr.DeriveFromExtKeys(kp, indexKey, addrType)
 				switch {
 				case err == hdkeychain.ErrInvalidChild:
-			// Record the existence of an invalid child with the
+					branchState.MarkInvalidChild(addrIndex)
-			// external branch's recovery state. This also
+					addrIndex++
-			// increments the branch's horizon so that it accounts
-			// for this skipped child index.
-			scopeState.ExternalBranch.MarkInvalidChild(childIndex)
-			childIndex++
 					continue
 
 				case err != nil:
 					return err
 				}
 
-		// Register the newly generated external address and child index
+				branchState.AddAddr(addrIndex, addr.Address())
-		// with the external branch recovery state.
-		scopeState.ExternalBranch.AddAddr(childIndex, addr.Address())
 
-		childIndex++
+				addrIndex++
 				count++
 			}
-
-	// Compute the current internal horizon and the number of addresses we
-	// must derive to ensure we maintain a sufficient recovery window for
-	// the internal branch.
-	inHorizon, inWindow := scopeState.InternalBranch.ExtendHorizon()
-	count, childIndex = 0, inHorizon
-	for count < inWindow {
-		keyPath := internalKeyPath(childIndex)
-		addr, err := scopedMgr.DeriveFromKeyPath(ns, keyPath)
-		switch {
-		case err == hdkeychain.ErrInvalidChild:
-			// Record the existence of an invalid child with the
-			// internal branch's recovery state. This also
-			// increments the branch's horizon so that it accounts
-			// for this skipped child index.
-			scopeState.InternalBranch.MarkInvalidChild(childIndex)
-			childIndex++
-			continue
-
-		case err != nil:
-			return err
 		}
-
-		// Register the newly generated internal address and child index
-		// with the internal branch recovery state.
-		scopeState.InternalBranch.AddAddr(childIndex, addr.Address())
-
-		childIndex++
-		count++
 	}
 
 	return nil
 }
 
-// keyPath returns the relative external derivation path /account/branch/index.
+// keyPath returns the relative derivation path /account/branch/index.
 func keyPath(account, branch, index uint32) waddrmgr.DerivationPath {
 	return waddrmgr.DerivationPath{
 		InternalAccount: account,
@@ -976,23 +967,22 @@ func newFilterBlocksRequest(batch []wtxmgr.BlockMeta,
 		WatchedOutPoints: recoveryState.WatchedOutPoints(),
 	}
 
-	// Populate the external and internal addresses by merging the addresses
+	// Populate the addresses by merging the addresses sets belong to all
-	// sets belong to all currently tracked scopes.
+	// currently tracked scopes.
 	for scope := range scopedMgrs {
 		scopeState := recoveryState.StateForScope(scope)
-		for index, addr := range scopeState.ExternalBranch.Addrs() {
+		for accountIndex, accountState := range scopeState {
+			for branchIndex, branchState := range accountState {
+				for addrIndex, addr := range branchState.Addrs() {
 					scopedIndex := waddrmgr.ScopedIndex{
 						Scope:   scope,
-				Index: index,
+						Account: uint32(accountIndex),
+						Branch:  uint32(branchIndex),
+						Index:   addrIndex,
 					}
-			filterReq.ExternalAddrs[scopedIndex] = addr
+					filterReq.Addresses[scopedIndex] = addr
 				}
-		for index, addr := range scopeState.InternalBranch.Addrs() {
-			scopedIndex := waddrmgr.ScopedIndex{
-				Scope: scope,
-				Index: index,
 			}
-			filterReq.InternalAddrs[scopedIndex] = addr
 		}
 	}
 
@@ -1007,85 +997,63 @@ func extendFoundAddresses(ns walletdb.ReadWriteBucket,
 	scopedMgrs map[waddrmgr.KeyScope]*waddrmgr.ScopedKeyManager,
 	recoveryState *RecoveryState) error {
 
-	// Mark all recovered external addresses as used. This will be done only
+	// Mark all recovered addresses as used. This will be done only for
-	// for scopes that reported a non-zero number of external addresses in
+	// scopes that reported a non-zero number of addresses in this block.
-	// this block.
+	for index := range filterResp.FoundAddresses {
-	for scope, indexes := range filterResp.FoundExternalAddrs {
+		scopedMgr := scopedMgrs[index.Scope]
-		// First, report all external child indexes found for this
+		// First, report all child indexes found for this scope. This
-		// scope. This ensures that the external last-found index will
+		// ensures that the last-found index will be updated to include
-		// be updated to include the maximum child index seen thus far.
+		// the maximum child index seen thus far.
-		scopeState := recoveryState.StateForScope(scope)
+		scopeState := recoveryState.StateForScope(index.Scope)
-		for index := range indexes {
+		branchState := scopeState[index.Account][index.Branch]
-			scopeState.ExternalBranch.ReportFound(index)
+		branchState.ReportFound(index.Index)
-		}
-
-		scopedMgr := scopedMgrs[scope]
-
 		// Now, with all found addresses reported, derive and extend all
 		// external addresses up to and including the current last found
 		// index for this scope.
-		exNextUnfound := scopeState.ExternalBranch.NextUnfound()
+		nextFound := branchState.NextUnfound()
 
-		exLastFound := exNextUnfound
+		lastFound := nextFound
-		if exLastFound > 0 {
+		if lastFound > 0 {
-			exLastFound--
+			lastFound--
 		}
 
-		err := scopedMgr.ExtendExternalAddresses(
+		err := scopedMgr.ExtendAddresses(
-			ns, waddrmgr.DefaultAccountNum, exLastFound,
+			ns, index.Account, index.Branch, lastFound,
 		)
 		if err != nil {
 			return err
 		}
 
 		// Finally, with the scope's addresses extended, we mark used
-		// the external addresses that were found in the block and
+		// the addresses that were found in the block and belong to
-		// belong to this scope.
+		// this scope.
-		for index := range indexes {
+		addr := branchState.GetAddr(index.Index)
-			addr := scopeState.ExternalBranch.GetAddr(index)
+		err = scopedMgr.MarkUsed(ns, addr)
-			err := scopedMgr.MarkUsed(ns, addr)
 		if err != nil {
 			return err
 		}
 	}
-	}
 
-	// Mark all recovered internal addresses as used. This will be done only
+	var lastAccount uint32
-	// for scopes that reported a non-zero number of internal addresses in
+	for _, scopedMgr := range scopedMgrs {
-	// this block.
+		account, err := scopedMgr.LastAccount(ns)
-	for scope, indexes := range filterResp.FoundInternalAddrs {
-		// First, report all internal child indexes found for this
-		// scope. This ensures that the internal last-found index will
-		// be updated to include the maximum child index seen thus far.
-		scopeState := recoveryState.StateForScope(scope)
-		for index := range indexes {
-			scopeState.InternalBranch.ReportFound(index)
-		}
-
-		scopedMgr := scopedMgrs[scope]
-
-		// Now, with all found addresses reported, derive and extend all
-		// internal addresses up to and including the current last found
-		// index for this scope.
-		inNextUnfound := scopeState.InternalBranch.NextUnfound()
-
-		inLastFound := inNextUnfound
-		if inLastFound > 0 {
-			inLastFound--
-		}
-		err := scopedMgr.ExtendInternalAddresses(
-			ns, waddrmgr.DefaultAccountNum, inLastFound,
-		)
 		if err != nil {
 			return err
 		}
+		if lastAccount < account {
+			lastAccount = account
+		}
+	}
 
-		// Finally, with the scope's addresses extended, we mark used
+	// Make sure all scopes are extended to the same account.
-		// the internal addresses that were found in the blockand belong
+	for _, s := range scopedMgrs {
-		// to this scope.
+		for gapAccount := lastAccount; gapAccount >= 0; gapAccount-- {
-		for index := range indexes {
+			_, err := s.AccountProperties(ns, gapAccount)
-			addr := scopeState.InternalBranch.GetAddr(index)
+			// If the account exists, we can stop extending.
-			err := scopedMgr.MarkUsed(ns, addr)
+			if err == nil {
+				break
+			}
+			err = s.NewRawAccount(ns, gapAccount)
 			if err != nil {
 				return err
 			}