diff --git a/core/filtermaps/filtermaps.go b/core/filtermaps/filtermaps.go
index e42c9e6199..09f4f84220 100644
--- a/core/filtermaps/filtermaps.go
+++ b/core/filtermaps/filtermaps.go
@@ -50,6 +50,7 @@ var (
 )
 
 const (
+	databaseVersion       = 1    // reindexed if database version does not match
 	cachedLastBlocks      = 1000 // last block of map pointers
 	cachedLvPointers      = 1000 // first log value pointer of block pointers
 	cachedBaseRows        = 100  // groups of base layer filter row data
@@ -138,13 +139,25 @@ type FilterMaps struct {
 // as transparent (uncached/unchanged).
 type filterMap []FilterRow
 
-// copy returns a copy of the given filter map. Note that the row slices are
-// copied but their contents are not. This permits extending the rows further
+// fastCopy returns a copy of the given filter map. Note that the row slices are
+// copied but their contents are not. This permits appending to the rows further
 // (which happens during map rendering) without affecting the validity of
 // copies made for snapshots during rendering.
-func (fm filterMap) copy() filterMap {
+// Appending to the rows of both the original map and the fast copy, or two fast
+// copies of the same map would result in data corruption, therefore a fast copy
+// should always be used in a read only way.
+func (fm filterMap) fastCopy() filterMap {
+	return slices.Clone(fm)
+}
+
+// fullCopy returns a copy of the given filter map, also making a copy of each
+// individual filter row, ensuring that a modification to either one will never
+// affect the other.
+func (fm filterMap) fullCopy() filterMap {
 	c := make(filterMap, len(fm))
-	copy(c, fm)
+	for i, row := range fm {
+		c[i] = slices.Clone(row)
+	}
 	return c
 }
 
@@ -207,8 +220,9 @@ type Config struct {
 // NewFilterMaps creates a new FilterMaps and starts the indexer.
 func NewFilterMaps(db ctxcdb.KeyValueStore, initView *ChainView, historyCutoff, finalBlock uint64, params Params, config Config) *FilterMaps {
 	rs, initialized, err := rawdb.ReadFilterMapsRange(db)
-	if err != nil {
-		log.Error("Error reading log index range", "error", err)
+	if err != nil || rs.Version != databaseVersion {
+		rs, initialized = rawdb.FilterMapsRange{}, false
+		log.Warn("Invalid log index database version; resetting log index")
 	}
 	params.deriveFields()
 	f := &FilterMaps{
@@ -437,6 +451,7 @@ func (f *FilterMaps) setRange(batch ctxcdb.KeyValueWriter, newView *ChainView, n
 	f.updateMatchersValidRange()
 	if newRange.initialized {
 		rs := rawdb.FilterMapsRange{
+			Version:          databaseVersion,
 			HeadIndexed:      newRange.headIndexed,
 			HeadDelimiter:    newRange.headDelimiter,
 			BlocksFirst:      newRange.blocks.First(),
diff --git a/core/filtermaps/map_renderer.go b/core/filtermaps/map_renderer.go
index 310ea0401c..de4d80d8e5 100644
--- a/core/filtermaps/map_renderer.go
+++ b/core/filtermaps/map_renderer.go
@@ -84,7 +84,7 @@ func (f *FilterMaps) renderMapsBefore(renderBefore uint32) (*mapRenderer, error)
 	if err != nil {
 		return nil, err
 	}
-	if snapshot := f.lastCanonicalSnapshotBefore(renderBefore); snapshot != nil && snapshot.mapIndex >= nextMap {
+	if snapshot := f.lastCanonicalSnapshotOfMap(nextMap); snapshot != nil {
 		return f.renderMapsFromSnapshot(snapshot)
 	}
 	if nextMap >= renderBefore {
@@ -97,14 +97,14 @@ func (f *FilterMaps) renderMapsBefore(renderBefore uint32) (*mapRenderer, error)
 // snapshot made at a block boundary.
 func (f *FilterMaps) renderMapsFromSnapshot(cp *renderedMap) (*mapRenderer, error) {
 	f.testSnapshotUsed = true
-	iter, err := f.newLogIteratorFromBlockDelimiter(cp.lastBlock)
+	iter, err := f.newLogIteratorFromBlockDelimiter(cp.lastBlock, cp.headDelimiter)
 	if err != nil {
 		return nil, fmt.Errorf("failed to create log iterator from block delimiter %d: %v", cp.lastBlock, err)
 	}
 	return &mapRenderer{
 		f: f,
 		currentMap: &renderedMap{
-			filterMap:   cp.filterMap.copy(),
+			filterMap:   cp.filterMap.fullCopy(),
 			mapIndex:    cp.mapIndex,
 			lastBlock:   cp.lastBlock,
 			blockLvPtrs: cp.blockLvPtrs,
@@ -137,14 +137,14 @@ func (f *FilterMaps) renderMapsFromMapBoundary(firstMap, renderBefore uint32, st
 	}, nil
 }
 
-// lastCanonicalSnapshotBefore returns the latest cached snapshot that matches
-// the current targetView.
-func (f *FilterMaps) lastCanonicalSnapshotBefore(renderBefore uint32) *renderedMap {
+// lastCanonicalSnapshotOfMap returns the latest cached snapshot of the given map
+// that is also consistent with the current targetView.
+func (f *FilterMaps) lastCanonicalSnapshotOfMap(mapIndex uint32) *renderedMap {
 	var best *renderedMap
 	for _, blockNumber := range f.renderSnapshots.Keys() {
 		if cp, _ := f.renderSnapshots.Get(blockNumber); cp != nil && blockNumber < f.indexedRange.blocks.AfterLast() &&
 			blockNumber <= f.targetView.headNumber && f.targetView.getBlockId(blockNumber) == cp.lastBlockId &&
-			cp.mapIndex < renderBefore && (best == nil || blockNumber > best.lastBlock) {
+			cp.mapIndex == mapIndex && (best == nil || blockNumber > best.lastBlock) {
 			best = cp
 		}
 	}
@@ -171,10 +171,9 @@ func (f *FilterMaps) lastCanonicalMapBoundaryBefore(renderBefore uint32) (nextMa
 		if err != nil {
 			return 0, 0, 0, fmt.Errorf("failed to retrieve last block of reverse iterated map %d: %v", mapIndex, err)
 		}
-		if lastBlock >= f.indexedView.headNumber || lastBlock >= f.targetView.headNumber ||
-			lastBlockId != f.targetView.getBlockId(lastBlock) {
-			// map is not full or inconsistent with targetView; roll back
-			continue
+		if (f.indexedRange.headIndexed && mapIndex >= f.indexedRange.maps.Last()) ||
+			lastBlock >= f.targetView.headNumber || lastBlockId != f.targetView.getBlockId(lastBlock) {
+			continue // map is not full or inconsistent with targetView; roll back
 		}
 		lvPtr, err := f.getBlockLvPointer(lastBlock)
 		if err != nil {
@@ -257,11 +256,14 @@ func (f *FilterMaps) loadHeadSnapshot() error {
 
 // makeSnapshot creates a snapshot of the current state of the rendered map.
 func (r *mapRenderer) makeSnapshot() {
-	r.f.renderSnapshots.Add(r.iterator.blockNumber, &renderedMap{
-		filterMap:     r.currentMap.filterMap.copy(),
+	if r.iterator.blockNumber != r.currentMap.lastBlock || r.iterator.chainView != r.f.targetView {
+		panic("iterator state inconsistent with current rendered map")
+	}
+	r.f.renderSnapshots.Add(r.currentMap.lastBlock, &renderedMap{
+		filterMap:     r.currentMap.filterMap.fastCopy(),
 		mapIndex:      r.currentMap.mapIndex,
-		lastBlock:     r.iterator.blockNumber,
-		lastBlockId:   r.f.targetView.getBlockId(r.currentMap.lastBlock),
+		lastBlock:     r.currentMap.lastBlock,
+		lastBlockId:   r.iterator.chainView.getBlockId(r.currentMap.lastBlock),
 		blockLvPtrs:   r.currentMap.blockLvPtrs,
 		finished:      true,
 		headDelimiter: r.iterator.lvIndex,
@@ -661,24 +663,13 @@ var errUnindexedRange = errors.New("unindexed range")
 // newLogIteratorFromBlockDelimiter creates a logIterator starting at the
 // given block's first log value entry (the block delimiter), according to the
 // current targetView.
-func (f *FilterMaps) newLogIteratorFromBlockDelimiter(blockNumber uint64) (*logIterator, error) {
+func (f *FilterMaps) newLogIteratorFromBlockDelimiter(blockNumber, lvIndex uint64) (*logIterator, error) {
 	if blockNumber > f.targetView.headNumber {
 		return nil, fmt.Errorf("iterator entry point %d after target chain head block %d", blockNumber, f.targetView.headNumber)
 	}
 	if !f.indexedRange.blocks.Includes(blockNumber) {
 		return nil, errUnindexedRange
 	}
-	var lvIndex uint64
-	if f.indexedRange.headIndexed && blockNumber+1 == f.indexedRange.blocks.AfterLast() {
-		lvIndex = f.indexedRange.headDelimiter
-	} else {
-		var err error
-		lvIndex, err = f.getBlockLvPointer(blockNumber + 1)
-		if err != nil {
-			return nil, fmt.Errorf("failed to retrieve log value pointer of block %d after delimiter: %v", blockNumber+1, err)
-		}
-		lvIndex--
-	}
 	finished := blockNumber == f.targetView.headNumber
 	l := &logIterator{
 		chainView:   f.targetView,
diff --git a/core/filtermaps/matcher_backend.go b/core/filtermaps/matcher_backend.go
index 85d61c6f14..7ac7fdf49c 100644
--- a/core/filtermaps/matcher_backend.go
+++ b/core/filtermaps/matcher_backend.go
@@ -75,6 +75,9 @@ func (fm *FilterMapsMatcherBackend) Close() {
 // on write.
 // GetFilterMapRow implements MatcherBackend.
 func (fm *FilterMapsMatcherBackend) GetFilterMapRow(ctx context.Context, mapIndex, rowIndex uint32, baseLayerOnly bool) (FilterRow, error) {
+	fm.f.indexLock.RLock()
+	defer fm.f.indexLock.RUnlock()
+
 	return fm.f.getFilterMapRow(mapIndex, rowIndex, baseLayerOnly)
 }
 
diff --git a/core/rawdb/accessors_indexes.go b/core/rawdb/accessors_indexes.go
index 657abd311b..de8e30a0aa 100644
--- a/core/rawdb/accessors_indexes.go
+++ b/core/rawdb/accessors_indexes.go
@@ -469,6 +469,7 @@ func DeleteBloombits(db ctxcdb.Database, bit uint, from uint64, to uint64) {
 // FilterMapsRange is a storage representation of the block range covered by the
 // filter maps structure and the corresponting log value index range.
 type FilterMapsRange struct {
+	Version                      uint32
 	HeadIndexed                  bool
 	HeadDelimiter                uint64
 	BlocksFirst, BlocksAfterLast uint64
diff --git a/ctxc/backend.go b/ctxc/backend.go
index 67aeec01f5..272e6a5dca 100644
--- a/ctxc/backend.go
+++ b/ctxc/backend.go
@@ -216,7 +216,6 @@ func New(stack *node.Node, config *Config) (*Cortex, error) {
 
 			//StateHistory:         config.StateHistory,
 			//StateScheme:          scheme,
-			//HistoryPruningCutoff: historyPruningCutoff,
 			ChainHistoryMode: config.HistoryMode,
 		}
 	)
diff --git a/go.mod b/go.mod
index 4e7cb84731..500fc02e28 100644
--- a/go.mod
+++ b/go.mod
@@ -6,7 +6,7 @@ require (
 	github.com/Azure/azure-sdk-for-go/sdk/storage/azblob v1.6.0
 	github.com/CortexFoundation/inference v1.0.2-0.20230307032835-9197d586a4e8
 	github.com/CortexFoundation/statik v0.0.0-20210315012922-8bb8a7b5dc66
-	github.com/CortexFoundation/torrentfs v1.0.69-0.20250415134051-0b782fe8b66d
+	github.com/CortexFoundation/torrentfs v1.0.69-0.20250416125950-ceaf4dd388f2
 	github.com/VictoriaMetrics/fastcache v1.12.2
 	github.com/arsham/figurine v1.3.0
 	github.com/aws/aws-sdk-go-v2 v1.36.3
diff --git a/go.sum b/go.sum
index 51726ce023..379e7fcc83 100644
--- a/go.sum
+++ b/go.sum
@@ -70,8 +70,8 @@ github.com/CortexFoundation/statik v0.0.0-20210315012922-8bb8a7b5dc66/go.mod h1:
 github.com/CortexFoundation/torrentfs v1.0.13-0.20200623060705-ce027f43f2f8/go.mod h1:Ma+tGhPPvz4CEZHaqEJQMOEGOfHeQBiAoNd1zyc/w3Q=
 github.com/CortexFoundation/torrentfs v1.0.14-0.20200703071639-3fcabcabf274/go.mod h1:qnb3YlIJmuetVBtC6Lsejr0Xru+1DNmDCdTqnwy7lhk=
 github.com/CortexFoundation/torrentfs v1.0.20-0.20200810031954-d36d26f82fcc/go.mod h1:N5BsicP5ynjXIi/Npl/SRzlJ630n1PJV2sRj0Z0t2HA=
-github.com/CortexFoundation/torrentfs v1.0.69-0.20250415134051-0b782fe8b66d h1:oZk98KwRFZJHPhztM2yGwHobSa0wls6gdJXHRbSTdPs=
-github.com/CortexFoundation/torrentfs v1.0.69-0.20250415134051-0b782fe8b66d/go.mod h1:Lf7iaFiGPvExQiyPufsbQ8hs0XkKUunTLcp0r77/IaY=
+github.com/CortexFoundation/torrentfs v1.0.69-0.20250416125950-ceaf4dd388f2 h1:qvdjsYBKOJRrufSDO+DtpnX7TJdugbhrvL7/xhQBBdw=
+github.com/CortexFoundation/torrentfs v1.0.69-0.20250416125950-ceaf4dd388f2/go.mod h1:Lf7iaFiGPvExQiyPufsbQ8hs0XkKUunTLcp0r77/IaY=
 github.com/CortexFoundation/wormhole v0.0.2-0.20241128010855-a23c88842cfa h1:46VAGWxOwpoLlPNcR9etAhK0NtT215skO9Wl4i14r4o=
 github.com/CortexFoundation/wormhole v0.0.2-0.20241128010855-a23c88842cfa/go.mod h1:ipzmPabDgzYKUbXkGVe2gTkBEp+MsDx6pXGiuYzmP6s=
 github.com/DATA-DOG/go-sqlmock v1.3.3/go.mod h1:f/Ixk793poVmq4qj/V1dPUg2JEAKC73Q5eFN3EC/SaM=
diff --git a/vendor/modules.txt b/vendor/modules.txt
index 56780b71d5..38481c28c1 100644
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@@ -61,7 +61,7 @@ github.com/CortexFoundation/robot/backend
 # github.com/CortexFoundation/statik v0.0.0-20210315012922-8bb8a7b5dc66
 ## explicit; go 1.16
 github.com/CortexFoundation/statik
-# github.com/CortexFoundation/torrentfs v1.0.69-0.20250415134051-0b782fe8b66d
+# github.com/CortexFoundation/torrentfs v1.0.69-0.20250416125950-ceaf4dd388f2
 ## explicit; go 1.23.4
 github.com/CortexFoundation/torrentfs
 github.com/CortexFoundation/torrentfs/backend