diff --git a/cmd/stindex/idxck.go b/cmd/stindex/idxck.go
index cf752820e..6f5011a08 100644
--- a/cmd/stindex/idxck.go
+++ b/cmd/stindex/idxck.go
@@ -43,7 +43,9 @@ func idxck(ldb backend.Backend) (success bool) {
 	sequences := make(map[sequenceKey]string)
 	needs := make(map[globalKey]struct{})
 	blocklists := make(map[string]struct{})
+	versions := make(map[string]protocol.Vector)
 	usedBlocklists := make(map[string]struct{})
+	usedVersions := make(map[string]struct{})
 	var localDeviceKey uint32
 	success = true
 
@@ -106,6 +108,16 @@ func idxck(ldb backend.Backend) (success bool) {
 		case db.KeyTypeBlockList:
 			hash := string(key[1:])
 			blocklists[hash] = struct{}{}
+
+		case db.KeyTypeVersion:
+			hash := string(key[1:])
+			var v protocol.Vector
+			if err := v.Unmarshal(it.Value()); err != nil {
+				fmt.Println("Unable to unmarshal Vector:", err)
+				success = false
+				continue
+			}
+			versions[hash] = v
 		}
 	}
 
@@ -157,6 +169,23 @@ func idxck(ldb backend.Backend) (success bool) {
 				usedBlocklists[key] = struct{}{}
 			}
 		}
+
+		if fi.VersionHash != nil {
+			key := string(fi.VersionHash)
+			if _, ok := versions[key]; !ok {
+				fmt.Printf("Missing version vector for file %q, version hash %x\n", fi.Name, fi.VersionHash)
+				success = false
+			} else {
+				usedVersions[key] = struct{}{}
+			}
+		}
+
+		_, ok := globals[globalKey{fk.folder, fk.name}]
+		if !ok {
+			fmt.Printf("Missing global for file %q\n", fi.Name)
+			success = false
+			continue
+		}
 	}
 
 	// Aggregate the ranges of missing sequence entries, print them
@@ -201,7 +230,12 @@ func idxck(ldb backend.Backend) (success bool) {
 				fmt.Printf("VersionList %q, folder %q, entry %d refers to unknown FileInfo\n", gk.name, folder, i)
 				success = false
 			}
-			if !fi.Version.Equal(fv.Version) {
+
+			fiv := fi.Version
+			if fi.VersionHash != nil {
+				fiv = versions[string(fi.VersionHash)]
+			}
+			if !fiv.Equal(fv.Version) {
 				fmt.Printf("VersionList %q, folder %q, entry %d, FileInfo version mismatch, %v (VersionList) != %v (FileInfo)\n", gk.name, folder, i, fv.Version, fi.Version)
 				success = false
 			}
@@ -277,6 +311,9 @@ func idxck(ldb backend.Backend) (success bool) {
 	if d := len(blocklists) - len(usedBlocklists); d > 0 {
 		fmt.Printf("%d block list entries out of %d needs GC\n", d, len(blocklists))
 	}
+	if d := len(versions) - len(usedVersions); d > 0 {
+		fmt.Printf("%d version entries out of %d needs GC\n", d, len(versions))
+	}
 
 	return
 }
diff --git a/lib/db/keyer.go b/lib/db/keyer.go
index 88103eb07..f3e15feff 100644
--- a/lib/db/keyer.go
+++ b/lib/db/keyer.go
@@ -65,6 +65,9 @@ const (
 
 	// KeyTypeBlockListMap <int32 folder ID> <block list hash> <file name> = <nothing>
 	KeyTypeBlockListMap = 14
+
+	// KeyTypeVersion <version hash> = Vector
+	KeyTypeVersion = 15
 )
 
 type keyer interface {
@@ -104,6 +107,9 @@ type keyer interface {
 
 	// Block lists
 	GenerateBlockListKey(key []byte, hash []byte) blockListKey
+
+	// Version vectors
+	GenerateVersionKey(key []byte, hash []byte) versionKey
 }
 
 // defaultKeyer implements our key scheme. It needs folder and device
@@ -328,7 +334,20 @@ func (k defaultKeyer) GenerateBlockListKey(key []byte, hash []byte) blockListKey
 	return key
 }
 
-func (k blockListKey) BlocksHash() []byte {
+func (k blockListKey) Hash() []byte {
+	return k[keyPrefixLen:]
+}
+
+type versionKey []byte
+
+func (k defaultKeyer) GenerateVersionKey(key []byte, hash []byte) versionKey {
+	key = resize(key, keyPrefixLen+len(hash))
+	key[0] = KeyTypeVersion
+	copy(key[keyPrefixLen:], hash)
+	return key
+}
+
+func (k versionKey) Hash() []byte {
 	return k[keyPrefixLen:]
 }
 
diff --git a/lib/db/lowlevel.go b/lib/db/lowlevel.go
index 985aa29eb..5bcfe3ba5 100644
--- a/lib/db/lowlevel.go
+++ b/lib/db/lowlevel.go
@@ -15,6 +15,7 @@ import (
 	"github.com/greatroar/blobloom"
 	"github.com/syncthing/syncthing/lib/db/backend"
 	"github.com/syncthing/syncthing/lib/protocol"
+	"github.com/syncthing/syncthing/lib/sha256"
 	"github.com/syncthing/syncthing/lib/sync"
 	"github.com/syncthing/syncthing/lib/util"
 	"github.com/thejerf/suture"
@@ -34,6 +35,8 @@ const (
 
 	// Use indirection for the block list when it exceeds this many entries
 	blocksIndirectionCutoff = 3
+	// Use indirection for the version vector when it exceeds this many entries
+	versionIndirectionCutoff = 10
 
 	recheckDefaultInterval = 30 * 24 * time.Hour
 )
@@ -630,11 +633,8 @@ func (db *Lowlevel) gcIndirect(ctx context.Context) error {
 	if db.gcKeyCount > capacity {
 		capacity = db.gcKeyCount
 	}
-	blockFilter := blobloom.NewOptimized(blobloom.Config{
-		Capacity: uint64(capacity),
-		FPRate:   indirectGCBloomFalsePositiveRate,
-		MaxBits:  8 * indirectGCBloomMaxBytes,
-	})
+	blockFilter := newBloomFilter(capacity)
+	versionFilter := newBloomFilter(capacity)
 
 	// Iterate the FileInfos, unmarshal the block and version hashes and
 	// add them to the filter.
@@ -651,12 +651,15 @@ func (db *Lowlevel) gcIndirect(ctx context.Context) error {
 		default:
 		}
 
-		var bl BlocksHashOnly
-		if err := bl.Unmarshal(it.Value()); err != nil {
+		var hashes IndirectionHashesOnly
+		if err := hashes.Unmarshal(it.Value()); err != nil {
 			return err
 		}
-		if len(bl.BlocksHash) > 0 {
-			blockFilter.Add(bloomHash(bl.BlocksHash))
+		if len(hashes.BlocksHash) > 0 {
+			blockFilter.Add(bloomHash(hashes.BlocksHash))
+		}
+		if len(hashes.VersionHash) > 0 {
+			versionFilter.Add(bloomHash(hashes.VersionHash))
 		}
 	}
 	it.Release()
@@ -681,7 +684,7 @@ func (db *Lowlevel) gcIndirect(ctx context.Context) error {
 		}
 
 		key := blockListKey(it.Key())
-		if blockFilter.Has(bloomHash(key.BlocksHash())) {
+		if blockFilter.Has(bloomHash(key.Hash())) {
 			matchedBlocks++
 			continue
 		}
@@ -694,8 +697,40 @@ func (db *Lowlevel) gcIndirect(ctx context.Context) error {
 		return err
 	}
 
+	// Iterate over version lists, removing keys with hashes that don't match
+	// the filter.
+
+	it, err = db.NewPrefixIterator([]byte{KeyTypeVersion})
+	if err != nil {
+		return err
+	}
+	matchedVersions := 0
+	for it.Next() {
+		select {
+		case <-ctx.Done():
+			return ctx.Err()
+		default:
+		}
+
+		key := versionKey(it.Key())
+		if versionFilter.Has(bloomHash(key.Hash())) {
+			matchedVersions++
+			continue
+		}
+		if err := t.Delete(key); err != nil {
+			return err
+		}
+	}
+	it.Release()
+	if err := it.Error(); err != nil {
+		return err
+	}
+
 	// Remember the number of unique keys we kept until the next pass.
 	db.gcKeyCount = matchedBlocks
+	if matchedVersions > matchedBlocks {
+		db.gcKeyCount = matchedVersions
+	}
 
 	if err := t.Commit(); err != nil {
 		return err
@@ -704,9 +739,20 @@ func (db *Lowlevel) gcIndirect(ctx context.Context) error {
 	return db.Compact()
 }
 
+func newBloomFilter(capacity int) *blobloom.Filter {
+	return blobloom.NewOptimized(blobloom.Config{
+		Capacity: uint64(capacity),
+		FPRate:   indirectGCBloomFalsePositiveRate,
+		MaxBits:  8 * indirectGCBloomMaxBytes,
+	})
+}
+
 // Hash function for the bloomfilter: first eight bytes of the SHA-256.
 // Big or little-endian makes no difference, as long as we're consistent.
 func bloomHash(key []byte) uint64 {
+	if len(key) != sha256.Size {
+		panic("bug: bloomHash passed something not a SHA256 hash")
+	}
 	return binary.BigEndian.Uint64(key)
 }
 
diff --git a/lib/db/schemaupdater.go b/lib/db/schemaupdater.go
index f973b2f9f..b2d6f1f86 100644
--- a/lib/db/schemaupdater.go
+++ b/lib/db/schemaupdater.go
@@ -23,9 +23,10 @@ import (
 //   7: v0.14.53
 //   8-9: v1.4.0
 //   10-11: v1.6.0
+//   12: v1.7.0
 const (
-	dbVersion             = 11
-	dbMinSyncthingVersion = "v1.6.0"
+	dbVersion             = 12
+	dbMinSyncthingVersion = "v1.7.0"
 )
 
 type databaseDowngradeError struct {
@@ -88,6 +89,7 @@ func (db *schemaUpdater) updateSchema() error {
 		{9, db.updateSchemaTo9},
 		{10, db.updateSchemaTo10},
 		{11, db.updateSchemaTo11},
+		{12, db.updateSchemaTo12},
 	}
 
 	for _, m := range migrations {
@@ -453,7 +455,6 @@ func (db *schemaUpdater) updateSchema6to7(_ int) error {
 
 func (db *schemaUpdater) updateSchemaTo9(prev int) error {
 	// Loads and rewrites all files with blocks, to deduplicate block lists.
-	// Checks for missing or incorrect sequence entries and rewrites those.
 
 	t, err := db.newReadWriteTransaction()
 	if err != nil {
@@ -461,6 +462,16 @@ func (db *schemaUpdater) updateSchemaTo9(prev int) error {
 	}
 	defer t.close()
 
+	if err := db.rewriteFiles(t); err != nil {
+		return err
+	}
+
+	db.recordTime(indirectGCTimeKey)
+
+	return t.Commit()
+}
+
+func (db *schemaUpdater) rewriteFiles(t readWriteTransaction) error {
 	it, err := t.NewPrefixIterator([]byte{KeyTypeDevice})
 	if err != nil {
 		return err
@@ -491,13 +502,7 @@ func (db *schemaUpdater) updateSchemaTo9(prev int) error {
 		}
 	}
 	it.Release()
-	if err := it.Error(); err != nil {
-		return err
-	}
-
-	db.recordTime(indirectGCTimeKey)
-
-	return t.Commit()
+	return it.Error()
 }
 
 func (db *schemaUpdater) updateSchemaTo10(_ int) error {
@@ -610,3 +615,19 @@ func (db *schemaUpdater) updateSchemaTo11(_ int) error {
 	}
 	return t.Commit()
 }
+
+func (db *schemaUpdater) updateSchemaTo12(_ int) error {
+	// Loads and rewrites all files, to deduplicate version vectors.
+
+	t, err := db.newReadWriteTransaction()
+	if err != nil {
+		return err
+	}
+	defer t.close()
+
+	if err := db.rewriteFiles(t); err != nil {
+		return err
+	}
+
+	return t.Commit()
+}
diff --git a/lib/db/structs.pb.go b/lib/db/structs.pb.go
index 7b829d188..d343c80e6 100644
--- a/lib/db/structs.pb.go
+++ b/lib/db/structs.pb.go
@@ -118,6 +118,7 @@ type FileInfoTruncated struct {
 	RawBlockSize  int32                 `protobuf:"varint,13,opt,name=block_size,json=blockSize,proto3" json:"block_size,omitempty"`
 	// see bep.proto
 	LocalFlags    uint32 `protobuf:"varint,1000,opt,name=local_flags,json=localFlags,proto3" json:"local_flags,omitempty"`
+	VersionHash   []byte `protobuf:"bytes,1001,opt,name=version_hash,json=versionHash,proto3" json:"version_hash,omitempty"`
 	Deleted       bool   `protobuf:"varint,6,opt,name=deleted,proto3" json:"deleted,omitempty"`
 	RawInvalid    bool   `protobuf:"varint,7,opt,name=invalid,proto3" json:"invalid,omitempty"`
 	NoPermissions bool   `protobuf:"varint,8,opt,name=no_permissions,json=noPermissions,proto3" json:"no_permissions,omitempty"`
@@ -193,23 +194,25 @@ func (m *BlockList) XXX_DiscardUnknown() {
 
 var xxx_messageInfo_BlockList proto.InternalMessageInfo
 
-// BlocksHashOnly is used to only unmarshal the block list hash from a FileInfo
-type BlocksHashOnly struct {
-	BlocksHash []byte `protobuf:"bytes,18,opt,name=blocks_hash,json=blocksHash,proto3" json:"blocks_hash,omitempty"`
+// IndirectionHashesOnly is used to only unmarshal the indirection hashes
+// from a FileInfo
+type IndirectionHashesOnly struct {
+	BlocksHash  []byte `protobuf:"bytes,18,opt,name=blocks_hash,json=blocksHash,proto3" json:"blocks_hash,omitempty"`
+	VersionHash []byte `protobuf:"bytes,1001,opt,name=version_hash,json=versionHash,proto3" json:"version_hash,omitempty"`
 }
 
-func (m *BlocksHashOnly) Reset()         { *m = BlocksHashOnly{} }
-func (m *BlocksHashOnly) String() string { return proto.CompactTextString(m) }
-func (*BlocksHashOnly) ProtoMessage()    {}
-func (*BlocksHashOnly) Descriptor() ([]byte, []int) {
+func (m *IndirectionHashesOnly) Reset()         { *m = IndirectionHashesOnly{} }
+func (m *IndirectionHashesOnly) String() string { return proto.CompactTextString(m) }
+func (*IndirectionHashesOnly) ProtoMessage()    {}
+func (*IndirectionHashesOnly) Descriptor() ([]byte, []int) {
 	return fileDescriptor_e774e8f5f348d14d, []int{4}
 }
-func (m *BlocksHashOnly) XXX_Unmarshal(b []byte) error {
+func (m *IndirectionHashesOnly) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
 }
-func (m *BlocksHashOnly) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+func (m *IndirectionHashesOnly) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
 	if deterministic {
-		return xxx_messageInfo_BlocksHashOnly.Marshal(b, m, deterministic)
+		return xxx_messageInfo_IndirectionHashesOnly.Marshal(b, m, deterministic)
 	} else {
 		b = b[:cap(b)]
 		n, err := m.MarshalToSizedBuffer(b)
@@ -219,17 +222,17 @@ func (m *BlocksHashOnly) XXX_Marshal(b []byte, deterministic bool) ([]byte, erro
 		return b[:n], nil
 	}
 }
-func (m *BlocksHashOnly) XXX_Merge(src proto.Message) {
-	xxx_messageInfo_BlocksHashOnly.Merge(m, src)
+func (m *IndirectionHashesOnly) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_IndirectionHashesOnly.Merge(m, src)
 }
-func (m *BlocksHashOnly) XXX_Size() int {
+func (m *IndirectionHashesOnly) XXX_Size() int {
 	return m.ProtoSize()
 }
-func (m *BlocksHashOnly) XXX_DiscardUnknown() {
-	xxx_messageInfo_BlocksHashOnly.DiscardUnknown(m)
+func (m *IndirectionHashesOnly) XXX_DiscardUnknown() {
+	xxx_messageInfo_IndirectionHashesOnly.DiscardUnknown(m)
 }
 
-var xxx_messageInfo_BlocksHashOnly proto.InternalMessageInfo
+var xxx_messageInfo_IndirectionHashesOnly proto.InternalMessageInfo
 
 // For each folder and device we keep one of these to track the current
 // counts and sequence. We also keep one for the global state of the folder.
@@ -320,7 +323,7 @@ func init() {
 	proto.RegisterType((*VersionList)(nil), "db.VersionList")
 	proto.RegisterType((*FileInfoTruncated)(nil), "db.FileInfoTruncated")
 	proto.RegisterType((*BlockList)(nil), "db.BlockList")
-	proto.RegisterType((*BlocksHashOnly)(nil), "db.BlocksHashOnly")
+	proto.RegisterType((*IndirectionHashesOnly)(nil), "db.IndirectionHashesOnly")
 	proto.RegisterType((*Counts)(nil), "db.Counts")
 	proto.RegisterType((*CountsSet)(nil), "db.CountsSet")
 }
@@ -328,54 +331,56 @@ func init() {
 func init() { proto.RegisterFile("structs.proto", fileDescriptor_e774e8f5f348d14d) }
 
 var fileDescriptor_e774e8f5f348d14d = []byte{
-	// 747 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x8c, 0x54, 0xbf, 0x8f, 0xe2, 0x46,
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-	0xca, 0x94, 0xfb, 0xe7, 0x6c, 0xb9, 0x65, 0x94, 0x02, 0x25, 0x90, 0x22, 0x7f, 0x46, 0x34, 0x33,
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-	0x5d, 0x3c, 0x9f, 0x94, 0xbf, 0x9a, 0x7c, 0x20, 0x91, 0x60, 0x99, 0xdf, 0xba, 0xdf, 0x8f, 0x1a,
-	0xb8, 0x2c, 0x43, 0xe7, 0xd0, 0x8e, 0xc9, 0x35, 0x8d, 0x88, 0xfd, 0xcc, 0x35, 0xbc, 0x1e, 0x2e,
-	0x10, 0xb2, 0xe1, 0x8c, 0xa6, 0xd7, 0x41, 0x42, 0x63, 0xbb, 0xe9, 0x1a, 0x5e, 0x07, 0x97, 0x50,
-	0x66, 0x62, 0x92, 0x10, 0x41, 0x62, 0xbb, 0xa5, 0x33, 0x05, 0x1c, 0x5f, 0x82, 0x55, 0x0c, 0xf2,
-	0x3d, 0xe5, 0x02, 0xbd, 0x86, 0x4e, 0xd1, 0x85, 0xdb, 0x86, 0xdb, 0xf4, 0xac, 0x8b, 0x4f, 0x26,
-	0x71, 0x38, 0xa9, 0xcd, 0x5b, 0x0c, 0x53, 0x95, 0x7d, 0xd5, 0xfa, 0xfd, 0x6e, 0xd4, 0x18, 0xff,
-	0x62, 0xc2, 0x0b, 0x59, 0x35, 0x4b, 0x97, 0xec, 0x7d, 0xb6, 0x4b, 0xa3, 0x40, 0x90, 0x18, 0x21,
-	0x68, 0xa5, 0xc1, 0x86, 0xa8, 0xc5, 0xba, 0x58, 0xc5, 0x92, 0xe3, 0xf4, 0x96, 0xa8, 0x11, 0x9b,
-	0x58, 0xc5, 0xe8, 0x33, 0x80, 0x0d, 0x8b, 0xe9, 0x92, 0x92, 0x78, 0xc1, 0x6d, 0x53, 0x65, 0xba,
-	0x25, 0x33, 0x47, 0x3f, 0x81, 0x55, 0xa5, 0xc3, 0xdc, 0xee, 0xb9, 0x86, 0xd7, 0xf2, 0xbf, 0x96,
-	0x73, 0xfc, 0xb9, 0x1f, 0xbd, 0x59, 0x51, 0xb1, 0xde, 0x85, 0x93, 0x88, 0x6d, 0xa6, 0x3c, 0x4f,
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-	0x78, 0x22, 0x0b, 0x0f, 0x7e, 0x03, 0x5d, 0x35, 0x6a, 0xe1, 0xe4, 0xb6, 0x02, 0xa5, 0x8f, 0x3f,
-	0x3d, 0x5d, 0x50, 0xf1, 0xf2, 0x84, 0x85, 0xae, 0x45, 0xe1, 0xf8, 0x35, 0x0c, 0xfc, 0x4a, 0x80,
-	0x77, 0x69, 0x92, 0xff, 0xaf, 0x4a, 0xe3, 0x7f, 0x0c, 0x68, 0x7f, 0xcb, 0x76, 0xa9, 0xe0, 0xe8,
-	0x25, 0x98, 0x4b, 0x9a, 0x10, 0xae, 0xcc, 0x6e, 0x62, 0x0d, 0xe4, 0x99, 0x62, 0x9a, 0x29, 0x17,
-	0x51, 0xc2, 0x95, 0x9a, 0x26, 0xae, 0x53, 0xca, 0x4c, 0xda, 0x1a, 0x5c, 0x7d, 0x13, 0x26, 0xae,
-	0xf0, 0xd3, 0xef, 0xd6, 0x3c, 0x9d, 0xf0, 0x25, 0x98, 0x61, 0x2e, 0x48, 0xf9, 0xb1, 0x68, 0xf0,
-	0xc8, 0x98, 0xed, 0x27, 0xc6, 0x1c, 0x42, 0x47, 0xbf, 0x13, 0xb3, 0xb7, 0xca, 0x92, 0x3d, 0x5c,
-	0x61, 0xe4, 0x40, 0x4d, 0x38, 0xb5, 0xe6, 0x23, 0x29, 0xc7, 0xef, 0xa0, 0xab, 0xb7, 0x9c, 0x13,
-	0x81, 0x3c, 0x68, 0x47, 0x0a, 0x14, 0x97, 0x05, 0xf9, 0x42, 0xe8, 0x74, 0x79, 0x50, 0x9d, 0x97,
-	0xe3, 0x47, 0x19, 0x91, 0x2f, 0x81, 0x5a, 0xbc, 0x89, 0x4b, 0xe8, 0xbb, 0xf7, 0x7f, 0x3b, 0x8d,
-	0xfb, 0x83, 0x63, 0x3c, 0x1c, 0x1c, 0xe3, 0xaf, 0x83, 0xd3, 0xf8, 0xed, 0xe8, 0x34, 0xee, 0x8e,
-	0x8e, 0xf1, 0x70, 0x74, 0x1a, 0x7f, 0x1c, 0x9d, 0x46, 0xd8, 0x56, 0x72, 0xbd, 0xf9, 0x2f, 0x00,
-	0x00, 0xff, 0xff, 0x8a, 0x67, 0x08, 0x85, 0x7f, 0x05, 0x00, 0x00,
+	// 774 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x8c, 0x54, 0x4d, 0x8f, 0xe3, 0x44,
+	0x10, 0x8d, 0x37, 0x71, 0x3e, 0xca, 0x49, 0xd8, 0x6d, 0x96, 0x91, 0x15, 0x09, 0xc7, 0x0a, 0x5a,
+	0xc9, 0xe2, 0x90, 0xc0, 0xec, 0x0d, 0x24, 0x0e, 0x61, 0x35, 0x22, 0x12, 0x62, 0x51, 0x67, 0xb5,
+	0xa7, 0x95, 0x22, 0x7f, 0x74, 0x92, 0xd6, 0x38, 0xee, 0xe0, 0xee, 0xcc, 0xc8, 0xf3, 0x17, 0xb8,
+	0x70, 0xe4, 0x38, 0x17, 0xfe, 0xcb, 0x1c, 0xe7, 0x88, 0x38, 0x44, 0x90, 0x70, 0x80, 0x7f, 0x81,
+	0xba, 0xdb, 0x76, 0x3c, 0x73, 0x61, 0x6e, 0x55, 0xaf, 0x2a, 0xa9, 0xaa, 0xf7, 0x9e, 0x1b, 0x7a,
+	0x5c, 0xa4, 0xbb, 0x50, 0xf0, 0xf1, 0x36, 0x65, 0x82, 0xa1, 0x67, 0x51, 0x30, 0xf8, 0x2c, 0x25,
+	0x5b, 0xc6, 0x27, 0x0a, 0x08, 0x76, 0xcb, 0xc9, 0x8a, 0xad, 0x98, 0x4a, 0x54, 0xa4, 0x1b, 0x07,
+	0x67, 0x31, 0x0d, 0x74, 0x4b, 0xc8, 0xe2, 0x49, 0x40, 0xb6, 0x1a, 0x1f, 0xfd, 0x6c, 0x80, 0x75,
+	0x41, 0x63, 0xf2, 0x9e, 0xa4, 0x9c, 0xb2, 0x04, 0x7d, 0x01, 0xad, 0x2b, 0x1d, 0xda, 0x86, 0x6b,
+	0x78, 0xd6, 0xf9, 0xf3, 0x71, 0xf1, 0xab, 0xf1, 0x7b, 0x12, 0x0a, 0x96, 0x4e, 0x1b, 0x77, 0xfb,
+	0x61, 0x0d, 0x17, 0x6d, 0xe8, 0x0c, 0x9a, 0x11, 0xb9, 0xa2, 0x21, 0xb1, 0x9f, 0xb9, 0x86, 0xd7,
+	0xc5, 0x79, 0x86, 0x6c, 0x68, 0xd1, 0xe4, 0xca, 0x8f, 0x69, 0x64, 0xd7, 0x5d, 0xc3, 0x6b, 0xe3,
+	0x22, 0x95, 0x95, 0x88, 0xc4, 0x44, 0x90, 0xc8, 0x6e, 0xe8, 0x4a, 0x9e, 0x8e, 0x2e, 0xc0, 0xca,
+	0x17, 0xf9, 0x9e, 0x72, 0x81, 0xbe, 0x84, 0x76, 0x3e, 0x85, 0xdb, 0x86, 0x5b, 0xf7, 0xac, 0xf3,
+	0x8f, 0xc6, 0x51, 0x30, 0xae, 0xec, 0x9b, 0x2f, 0x53, 0xb6, 0x7d, 0xd5, 0xf8, 0xf5, 0x76, 0x58,
+	0x1b, 0xfd, 0x66, 0xc2, 0x0b, 0xd9, 0x35, 0x4b, 0x96, 0xec, 0x5d, 0xba, 0x4b, 0x42, 0x5f, 0x90,
+	0x08, 0x21, 0x68, 0x24, 0xfe, 0x86, 0xa8, 0xc3, 0x3a, 0x58, 0xc5, 0x12, 0xe3, 0xf4, 0x86, 0xa8,
+	0x15, 0xeb, 0x58, 0xc5, 0xe8, 0x53, 0x80, 0x0d, 0x8b, 0xe8, 0x92, 0x92, 0x68, 0xc1, 0x6d, 0x53,
+	0x55, 0x3a, 0x05, 0x32, 0x47, 0x1f, 0xc0, 0x2a, 0xcb, 0x41, 0x66, 0x77, 0x5d, 0xc3, 0x6b, 0x4c,
+	0xbf, 0x96, 0x7b, 0xfc, 0xb1, 0x1f, 0xbe, 0x5e, 0x51, 0xb1, 0xde, 0x05, 0xe3, 0x90, 0x6d, 0x26,
+	0x3c, 0x4b, 0x42, 0xb1, 0xa6, 0xc9, 0xaa, 0x12, 0x55, 0x65, 0x18, 0xcf, 0xd7, 0x2c, 0x15, 0xb3,
+	0x37, 0xb8, 0x1c, 0x37, 0xcd, 0xaa, 0x02, 0x74, 0x9e, 0x26, 0xc0, 0x00, 0xda, 0x9c, 0xfc, 0xb4,
+	0x23, 0x49, 0x48, 0x6c, 0x50, 0xcb, 0x96, 0x39, 0x7a, 0x05, 0x7d, 0x9e, 0x6d, 0x62, 0x9a, 0x5c,
+	0x2e, 0x84, 0x9f, 0xae, 0x88, 0xb0, 0x5f, 0xa8, 0xe3, 0x7b, 0x39, 0xfa, 0x4e, 0x81, 0x68, 0x08,
+	0x56, 0x10, 0xb3, 0xf0, 0x92, 0x2f, 0xd6, 0x3e, 0x5f, 0xdb, 0x48, 0x09, 0x09, 0x1a, 0xfa, 0xce,
+	0xe7, 0x6b, 0xf4, 0x39, 0x34, 0x44, 0xb6, 0xd5, 0x12, 0xf7, 0xcf, 0xcf, 0x4e, 0x2b, 0x95, 0x2c,
+	0x67, 0x5b, 0x82, 0x55, 0x0f, 0x72, 0xc1, 0xda, 0x92, 0x74, 0x43, 0xb9, 0x16, 0x4e, 0x4a, 0xdc,
+	0xc3, 0x55, 0x48, 0x8e, 0x2b, 0x19, 0x4c, 0xb8, 0x6d, 0xb9, 0x86, 0x67, 0x9e, 0x48, 0xf8, 0x81,
+	0xa3, 0x09, 0xe8, 0xe1, 0x0b, 0xa5, 0x4d, 0x4f, 0xd6, 0xa7, 0xcf, 0x0f, 0xfb, 0x61, 0x17, 0xfb,
+	0xd7, 0x53, 0x59, 0x98, 0xd3, 0x1b, 0x82, 0x3b, 0x41, 0x11, 0xca, 0x99, 0x31, 0x0b, 0xfd, 0x78,
+	0xb1, 0x8c, 0xfd, 0x15, 0xb7, 0xff, 0x69, 0xa9, 0xa1, 0xa0, 0xb0, 0x0b, 0x09, 0xa1, 0x11, 0x74,
+	0x73, 0xc2, 0xf4, 0x8d, 0xff, 0xb6, 0xd4, 0x91, 0x56, 0x0e, 0xaa, 0x2b, 0x2b, 0xc6, 0x6c, 0x3e,
+	0x30, 0x26, 0xf2, 0x4e, 0x66, 0x96, 0xbf, 0x6b, 0x4f, 0xfb, 0x87, 0xfd, 0x10, 0xb0, 0x7f, 0x3d,
+	0xd3, 0xe8, 0xc9, 0xdc, 0xaf, 0xa0, 0x9f, 0xb0, 0x45, 0x95, 0x80, 0xb6, 0xfa, 0xab, 0x5e, 0xc2,
+	0x7e, 0x3c, 0x81, 0xb9, 0x4f, 0xbf, 0x81, 0x8e, 0x3a, 0x27, 0x77, 0x7b, 0x53, 0x25, 0x85, 0xd7,
+	0x3f, 0x3e, 0xb1, 0xac, 0x70, 0x49, 0x73, 0xae, 0x7d, 0xde, 0x38, 0xfa, 0x00, 0x9f, 0xcc, 0x92,
+	0x88, 0xa6, 0x24, 0x14, 0xf9, 0x0d, 0x84, 0xbf, 0x4d, 0xe2, 0xec, 0xff, 0x05, 0x7d, 0x02, 0x1d,
+	0xa3, 0xbf, 0x0d, 0x68, 0x7e, 0xcb, 0x76, 0x89, 0xe0, 0xe8, 0x25, 0x98, 0x4b, 0x1a, 0x13, 0xae,
+	0xbe, 0x1d, 0x13, 0xeb, 0x44, 0xb2, 0xae, 0x87, 0xb3, 0x94, 0x12, 0xae, 0xcc, 0x61, 0xe2, 0x2a,
+	0xa4, 0xbc, 0xa9, 0x9d, 0xc6, 0xd5, 0x27, 0x66, 0xe2, 0x32, 0x7f, 0xfc, 0x0c, 0x98, 0x27, 0xb6,
+	0x5f, 0x82, 0x19, 0x64, 0x82, 0x14, 0xdf, 0x9e, 0x4e, 0x1e, 0xf8, 0xbc, 0xf9, 0xc8, 0xe7, 0x03,
+	0x68, 0xeb, 0x67, 0x67, 0xf6, 0x46, 0x39, 0xbc, 0x8b, 0xcb, 0x1c, 0x39, 0x50, 0xf1, 0x81, 0xa2,
+	0xe2, 0x81, 0x33, 0x46, 0x6f, 0xa1, 0xa3, 0xaf, 0x9c, 0x13, 0x81, 0x3c, 0x68, 0x86, 0x2a, 0xc9,
+	0x45, 0x00, 0xf9, 0xe0, 0xe8, 0x72, 0xc1, 0xbd, 0xae, 0xcb, 0xf5, 0xc3, 0x94, 0xc8, 0x87, 0x45,
+	0x1d, 0x5e, 0xc7, 0x45, 0x3a, 0x75, 0xef, 0xfe, 0x72, 0x6a, 0x77, 0x07, 0xc7, 0xb8, 0x3f, 0x38,
+	0xc6, 0x9f, 0x07, 0xa7, 0xf6, 0xcb, 0xd1, 0xa9, 0xdd, 0x1e, 0x1d, 0xe3, 0xfe, 0xe8, 0xd4, 0x7e,
+	0x3f, 0x3a, 0xb5, 0xa0, 0xa9, 0x94, 0x7d, 0xfd, 0x5f, 0x00, 0x00, 0x00, 0xff, 0xff, 0x3a, 0x45,
+	0x1c, 0xc5, 0xce, 0x05, 0x00, 0x00,
 }
 
 func (m *FileVersion) Marshal() (dAtA []byte, err error) {
@@ -495,6 +500,15 @@ func (m *FileInfoTruncated) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	_ = i
 	var l int
 	_ = l
+	if len(m.VersionHash) > 0 {
+		i -= len(m.VersionHash)
+		copy(dAtA[i:], m.VersionHash)
+		i = encodeVarintStructs(dAtA, i, uint64(len(m.VersionHash)))
+		i--
+		dAtA[i] = 0x3e
+		i--
+		dAtA[i] = 0xca
+	}
 	if m.LocalFlags != 0 {
 		i = encodeVarintStructs(dAtA, i, uint64(m.LocalFlags))
 		i--
@@ -647,7 +661,7 @@ func (m *BlockList) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	return len(dAtA) - i, nil
 }
 
-func (m *BlocksHashOnly) Marshal() (dAtA []byte, err error) {
+func (m *IndirectionHashesOnly) Marshal() (dAtA []byte, err error) {
 	size := m.ProtoSize()
 	dAtA = make([]byte, size)
 	n, err := m.MarshalToSizedBuffer(dAtA[:size])
@@ -657,16 +671,25 @@ func (m *BlocksHashOnly) Marshal() (dAtA []byte, err error) {
 	return dAtA[:n], nil
 }
 
-func (m *BlocksHashOnly) MarshalTo(dAtA []byte) (int, error) {
+func (m *IndirectionHashesOnly) MarshalTo(dAtA []byte) (int, error) {
 	size := m.ProtoSize()
 	return m.MarshalToSizedBuffer(dAtA[:size])
 }
 
-func (m *BlocksHashOnly) MarshalToSizedBuffer(dAtA []byte) (int, error) {
+func (m *IndirectionHashesOnly) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	i := len(dAtA)
 	_ = i
 	var l int
 	_ = l
+	if len(m.VersionHash) > 0 {
+		i -= len(m.VersionHash)
+		copy(dAtA[i:], m.VersionHash)
+		i = encodeVarintStructs(dAtA, i, uint64(len(m.VersionHash)))
+		i--
+		dAtA[i] = 0x3e
+		i--
+		dAtA[i] = 0xca
+	}
 	if len(m.BlocksHash) > 0 {
 		i -= len(m.BlocksHash)
 		copy(dAtA[i:], m.BlocksHash)
@@ -893,6 +916,10 @@ func (m *FileInfoTruncated) ProtoSize() (n int) {
 	if m.LocalFlags != 0 {
 		n += 2 + sovStructs(uint64(m.LocalFlags))
 	}
+	l = len(m.VersionHash)
+	if l > 0 {
+		n += 2 + l + sovStructs(uint64(l))
+	}
 	return n
 }
 
@@ -911,7 +938,7 @@ func (m *BlockList) ProtoSize() (n int) {
 	return n
 }
 
-func (m *BlocksHashOnly) ProtoSize() (n int) {
+func (m *IndirectionHashesOnly) ProtoSize() (n int) {
 	if m == nil {
 		return 0
 	}
@@ -921,6 +948,10 @@ func (m *BlocksHashOnly) ProtoSize() (n int) {
 	if l > 0 {
 		n += 2 + l + sovStructs(uint64(l))
 	}
+	l = len(m.VersionHash)
+	if l > 0 {
+		n += 2 + l + sovStructs(uint64(l))
+	}
 	return n
 }
 
@@ -1620,6 +1651,40 @@ func (m *FileInfoTruncated) Unmarshal(dAtA []byte) error {
 					break
 				}
 			}
+		case 1001:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field VersionHash", wireType)
+			}
+			var byteLen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowStructs
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				byteLen |= int(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if byteLen < 0 {
+				return ErrInvalidLengthStructs
+			}
+			postIndex := iNdEx + byteLen
+			if postIndex < 0 {
+				return ErrInvalidLengthStructs
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.VersionHash = append(m.VersionHash[:0], dAtA[iNdEx:postIndex]...)
+			if m.VersionHash == nil {
+				m.VersionHash = []byte{}
+			}
+			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skipStructs(dAtA[iNdEx:])
@@ -1731,7 +1796,7 @@ func (m *BlockList) Unmarshal(dAtA []byte) error {
 	}
 	return nil
 }
-func (m *BlocksHashOnly) Unmarshal(dAtA []byte) error {
+func (m *IndirectionHashesOnly) Unmarshal(dAtA []byte) error {
 	l := len(dAtA)
 	iNdEx := 0
 	for iNdEx < l {
@@ -1754,10 +1819,10 @@ func (m *BlocksHashOnly) Unmarshal(dAtA []byte) error {
 		fieldNum := int32(wire >> 3)
 		wireType := int(wire & 0x7)
 		if wireType == 4 {
-			return fmt.Errorf("proto: BlocksHashOnly: wiretype end group for non-group")
+			return fmt.Errorf("proto: IndirectionHashesOnly: wiretype end group for non-group")
 		}
 		if fieldNum <= 0 {
-			return fmt.Errorf("proto: BlocksHashOnly: illegal tag %d (wire type %d)", fieldNum, wire)
+			return fmt.Errorf("proto: IndirectionHashesOnly: illegal tag %d (wire type %d)", fieldNum, wire)
 		}
 		switch fieldNum {
 		case 18:
@@ -1794,6 +1859,40 @@ func (m *BlocksHashOnly) Unmarshal(dAtA []byte) error {
 				m.BlocksHash = []byte{}
 			}
 			iNdEx = postIndex
+		case 1001:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field VersionHash", wireType)
+			}
+			var byteLen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowStructs
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				byteLen |= int(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if byteLen < 0 {
+				return ErrInvalidLengthStructs
+			}
+			postIndex := iNdEx + byteLen
+			if postIndex < 0 {
+				return ErrInvalidLengthStructs
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.VersionHash = append(m.VersionHash[:0], dAtA[iNdEx:postIndex]...)
+			if m.VersionHash == nil {
+				m.VersionHash = []byte{}
+			}
+			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skipStructs(dAtA[iNdEx:])
diff --git a/lib/db/structs.proto b/lib/db/structs.proto
index 0f99e70e8..5a488e9a8 100644
--- a/lib/db/structs.proto
+++ b/lib/db/structs.proto
@@ -42,7 +42,8 @@ message FileInfoTruncated {
     int32                 block_size     = 13 [(gogoproto.customname) = "RawBlockSize"];
 
     // see bep.proto
-    uint32 local_flags = 1000;
+    uint32 local_flags  = 1000;
+    bytes  version_hash = 1001;
 
     bool deleted        = 6;
     bool invalid        = 7 [(gogoproto.customname) = "RawInvalid"];
@@ -54,9 +55,11 @@ message BlockList {
     repeated protocol.BlockInfo Blocks = 1 [(gogoproto.nullable) = false];
 }
 
-// BlocksHashOnly is used to only unmarshal the block list hash from a FileInfo
-message BlocksHashOnly {
-    bytes blocks_hash = 18;
+// IndirectionHashesOnly is used to only unmarshal the indirection hashes
+// from a FileInfo
+message IndirectionHashesOnly {
+    bytes blocks_hash  = 18;
+    bytes version_hash = 1001;
 }
 
 // For each folder and device we keep one of these to track the current
diff --git a/lib/db/transactions.go b/lib/db/transactions.go
index 0bb091363..37aedacb3 100644
--- a/lib/db/transactions.go
+++ b/lib/db/transactions.go
@@ -79,6 +79,9 @@ func (t readOnlyTransaction) unmarshalTrunc(bs []byte, trunc bool) (FileIntf, er
 		if err != nil {
 			return nil, err
 		}
+		if err := t.fillTruncated(&tf); err != nil {
+			return nil, err
+		}
 		return tf, nil
 	}
 
@@ -92,7 +95,8 @@ func (t readOnlyTransaction) unmarshalTrunc(bs []byte, trunc bool) (FileIntf, er
 	return fi, nil
 }
 
-// fillFileInfo follows the (possible) indirection of blocks and fills it out.
+// fillFileInfo follows the (possible) indirection of blocks and version
+// vector and fills it out.
 func (t readOnlyTransaction) fillFileInfo(fi *protocol.FileInfo) error {
 	var key []byte
 
@@ -110,6 +114,41 @@ func (t readOnlyTransaction) fillFileInfo(fi *protocol.FileInfo) error {
 		fi.Blocks = bl.Blocks
 	}
 
+	if len(fi.VersionHash) != 0 {
+		key = t.keyer.GenerateVersionKey(key, fi.VersionHash)
+		bs, err := t.Get(key)
+		if err != nil {
+			return err
+		}
+		var v protocol.Vector
+		if err := v.Unmarshal(bs); err != nil {
+			return err
+		}
+		fi.Version = v
+	}
+
+	return nil
+}
+
+// fillTruncated follows the (possible) indirection of version vector and
+// fills it.
+func (t readOnlyTransaction) fillTruncated(fi *FileInfoTruncated) error {
+	var key []byte
+
+	if len(fi.VersionHash) == 0 {
+		return nil
+	}
+
+	key = t.keyer.GenerateVersionKey(key, fi.VersionHash)
+	bs, err := t.Get(key)
+	if err != nil {
+		return err
+	}
+	var v protocol.Vector
+	if err := v.Unmarshal(bs); err != nil {
+		return err
+	}
+	fi.Version = v
 	return nil
 }
 
@@ -511,6 +550,24 @@ func (t readWriteTransaction) putFile(fkey []byte, fi protocol.FileInfo, truncat
 		fi.Blocks = nil
 	}
 
+	// Indirect the version vector if it's large enough.
+	if len(fi.Version.Counters) > versionIndirectionCutoff {
+		fi.VersionHash = protocol.VectorHash(fi.Version)
+		bkey = t.keyer.GenerateVersionKey(bkey, fi.VersionHash)
+		if _, err := t.Get(bkey); backend.IsNotFound(err) {
+			// Marshal the version vector and save it
+			versionBs := mustMarshal(&fi.Version)
+			if err := t.Put(bkey, versionBs); err != nil {
+				return err
+			}
+		} else if err != nil {
+			return err
+		}
+		fi.Version = protocol.Vector{}
+	} else {
+		fi.VersionHash = nil
+	}
+
 	fiBs := mustMarshal(&fi)
 	return t.Put(fkey, fiBs)
 }
diff --git a/lib/model/model.go b/lib/model/model.go
index 27b3180ef..3167de7b5 100644
--- a/lib/model/model.go
+++ b/lib/model/model.go
@@ -924,6 +924,7 @@ func (m *model) handleIndex(deviceID protocol.DeviceID, folder string, fs []prot
 		// The local attributes should never be transmitted over the wire.
 		// Make sure they look like they weren't.
 		fs[i].LocalFlags = 0
+		fs[i].VersionHash = nil
 	}
 	files.Update(deviceID, fs)
 
@@ -1968,7 +1969,10 @@ func (s *indexSender) sendIndexTo(ctx context.Context) error {
 		if f.IsReceiveOnlyChanged() {
 			f.Version = protocol.Vector{}
 		}
-		f.LocalFlags = 0 // never sent externally
+
+		// never sent externally
+		f.LocalFlags = 0
+		f.VersionHash = nil
 
 		previousWasDelete = f.IsDeleted()
 
diff --git a/lib/protocol/bep.pb.go b/lib/protocol/bep.pb.go
index a8d347a5f..a459cfbbe 100644
--- a/lib/protocol/bep.pb.go
+++ b/lib/protocol/bep.pb.go
@@ -506,7 +506,10 @@ type FileInfo struct {
 	// host only. It is not part of the protocol, doesn't get sent or
 	// received (we make sure to zero it), nonetheless we need it on our
 	// struct and to be able to serialize it to/from the database.
-	LocalFlags    uint32 `protobuf:"varint,1000,opt,name=local_flags,json=localFlags,proto3" json:"local_flags,omitempty"`
+	LocalFlags uint32 `protobuf:"varint,1000,opt,name=local_flags,json=localFlags,proto3" json:"local_flags,omitempty"`
+	// The version_hash is an implementation detail and not part of the wire
+	// format.
+	VersionHash   []byte `protobuf:"bytes,1001,opt,name=version_hash,json=versionHash,proto3" json:"version_hash,omitempty"`
 	Deleted       bool   `protobuf:"varint,6,opt,name=deleted,proto3" json:"deleted,omitempty"`
 	RawInvalid    bool   `protobuf:"varint,7,opt,name=invalid,proto3" json:"invalid,omitempty"`
 	NoPermissions bool   `protobuf:"varint,8,opt,name=no_permissions,json=noPermissions,proto3" json:"no_permissions,omitempty"`
@@ -922,122 +925,123 @@ func init() {
 func init() { proto.RegisterFile("bep.proto", fileDescriptor_e3f59eb60afbbc6e) }
 
 var fileDescriptor_e3f59eb60afbbc6e = []byte{
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+	// 1842 bytes of a gzipped FileDescriptorProto
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+	0x97, 0xcf, 0x0f, 0x3b, 0xdd, 0xdf, 0x98, 0x3c, 0x62, 0x5a, 0x7b, 0xb4, 0x58, 0xea, 0xf7, 0x36,
+	0xc0, 0x64, 0xea, 0x93, 0xa1, 0x15, 0x12, 0xbb, 0x2f, 0x9e, 0x7c, 0xe6, 0x2c, 0x48, 0xa8, 0x05,
+	0x3b, 0xf1, 0xd2, 0xf5, 0x66, 0x19, 0xed, 0xe3, 0xc5, 0x52, 0xff, 0xf0, 0x7b, 0xd7, 0xaf, 0x76,
+	0x2f, 0x48, 0xe8, 0x01, 0xe4, 0xa3, 0x20, 0x71, 0x25, 0x25, 0x97, 0x46, 0x0b, 0xf6, 0xfe, 0x2c,
+	0x41, 0x71, 0xa5, 0x66, 0x8c, 0xf0, 0x6e, 0xcf, 0x34, 0x30, 0xee, 0xe1, 0x98, 0x81, 0x95, 0xb3,
+	0x4b, 0xf9, 0x10, 0xdd, 0x83, 0xfc, 0x81, 0xd1, 0x35, 0x70, 0xa7, 0x15, 0x37, 0xc6, 0x0a, 0x72,
+	0x40, 0x3c, 0xe2, 0x3b, 0x43, 0xf4, 0x11, 0x94, 0xbb, 0x3d, 0xb3, 0x7f, 0xdc, 0x7a, 0x16, 0xa7,
+	0xce, 0xf7, 0x4f, 0x84, 0xea, 0xcf, 0x86, 0xa7, 0x9c, 0xcf, 0x3d, 0xd6, 0x43, 0x2f, 0x1a, 0x87,
+	0x9d, 0xb6, 0x80, 0x66, 0x34, 0x75, 0xb1, 0xd4, 0x6f, 0xae, 0xa0, 0xd1, 0x1b, 0xce, 0xb0, 0x7b,
+	0x36, 0x54, 0xbe, 0x5f, 0xb7, 0x90, 0x0e, 0xb9, 0xc6, 0xd1, 0x91, 0xd1, 0x6d, 0xc7, 0xa7, 0x5f,
+	0xfb, 0x1a, 0xd3, 0x29, 0xf1, 0x6c, 0x86, 0xd8, 0xef, 0xe1, 0x03, 0x63, 0x10, 0x1f, 0x7e, 0x8d,
+	0xd8, 0xa7, 0xec, 0x7f, 0xab, 0x59, 0x7f, 0xf3, 0x4d, 0x25, 0xf5, 0xf6, 0x9b, 0x4a, 0xea, 0xcd,
+	0x65, 0x45, 0x7a, 0x7b, 0x59, 0x91, 0xfe, 0x71, 0x59, 0x49, 0x7d, 0x7b, 0x59, 0x91, 0xfe, 0xf8,
+	0xae, 0x92, 0xfa, 0xea, 0x5d, 0x45, 0x7a, 0xfb, 0xae, 0x92, 0xfa, 0xdb, 0xbb, 0x4a, 0xea, 0x24,
+	0xc7, 0x35, 0xef, 0xd3, 0xff, 0x06, 0x00, 0x00, 0xff, 0xff, 0xfb, 0x99, 0x31, 0x0e, 0x75, 0x0f,
+	0x00, 0x00,
 }
 
 func (m *Hello) Marshal() (dAtA []byte, err error) {
@@ -1456,6 +1460,15 @@ func (m *FileInfo) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	_ = i
 	var l int
 	_ = l
+	if len(m.VersionHash) > 0 {
+		i -= len(m.VersionHash)
+		copy(dAtA[i:], m.VersionHash)
+		i = encodeVarintBep(dAtA, i, uint64(len(m.VersionHash)))
+		i--
+		dAtA[i] = 0x3e
+		i--
+		dAtA[i] = 0xca
+	}
 	if m.LocalFlags != 0 {
 		i = encodeVarintBep(dAtA, i, uint64(m.LocalFlags))
 		i--
@@ -2210,6 +2223,10 @@ func (m *FileInfo) ProtoSize() (n int) {
 	if m.LocalFlags != 0 {
 		n += 2 + sovBep(uint64(m.LocalFlags))
 	}
+	l = len(m.VersionHash)
+	if l > 0 {
+		n += 2 + l + sovBep(uint64(l))
+	}
 	return n
 }
 
@@ -3913,6 +3930,40 @@ func (m *FileInfo) Unmarshal(dAtA []byte) error {
 					break
 				}
 			}
+		case 1001:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field VersionHash", wireType)
+			}
+			var byteLen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowBep
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				byteLen |= int(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if byteLen < 0 {
+				return ErrInvalidLengthBep
+			}
+			postIndex := iNdEx + byteLen
+			if postIndex < 0 {
+				return ErrInvalidLengthBep
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.VersionHash = append(m.VersionHash[:0], dAtA[iNdEx:postIndex]...)
+			if m.VersionHash == nil {
+				m.VersionHash = []byte{}
+			}
+			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skipBep(dAtA[iNdEx:])
diff --git a/lib/protocol/bep.proto b/lib/protocol/bep.proto
index 60344e339..f2c222d2c 100644
--- a/lib/protocol/bep.proto
+++ b/lib/protocol/bep.proto
@@ -119,6 +119,9 @@ message FileInfo {
     // received (we make sure to zero it), nonetheless we need it on our
     // struct and to be able to serialize it to/from the database.
     uint32 local_flags = 1000;
+    // The version_hash is an implementation detail and not part of the wire
+    // format.
+    bytes version_hash = 1001;
 
     bool deleted        = 6;
     bool invalid        = 7 [(gogoproto.customname) = "RawInvalid"];
diff --git a/lib/protocol/bep_extensions.go b/lib/protocol/bep_extensions.go
index 62be831ea..d37cd1c5e 100644
--- a/lib/protocol/bep_extensions.go
+++ b/lib/protocol/bep_extensions.go
@@ -360,3 +360,16 @@ func BlocksHash(bs []BlockInfo) []byte {
 	}
 	return h.Sum(nil)
 }
+
+func VectorHash(v Vector) []byte {
+	h := sha256.New()
+	for _, c := range v.Counters {
+		if err := binary.Write(h, binary.BigEndian, c.ID); err != nil {
+			panic("impossible: failed to write c.ID to hash function: " + err.Error())
+		}
+		if err := binary.Write(h, binary.BigEndian, c.Value); err != nil {
+			panic("impossible: failed to write c.Value to hash function: " + err.Error())
+		}
+	}
+	return h.Sum(nil)
+}
diff --git a/lib/sha256/sha256.go b/lib/sha256/sha256.go
index 63dba134c..30f7dc9c8 100644
--- a/lib/sha256/sha256.go
+++ b/lib/sha256/sha256.go
@@ -26,6 +26,7 @@ const (
 	benchmarkingDuration   = 150 * time.Millisecond
 	defaultImpl            = "crypto/sha256"
 	minioImpl              = "minio/sha256-simd"
+	Size                   = cryptoSha256.Size
 )
 
 // May be switched out for another implementation