diff --git a/pkg/core/blockchain.go b/pkg/core/blockchain.go
index 878261691..d6a33f9d8 100644
--- a/pkg/core/blockchain.go
+++ b/pkg/core/blockchain.go
@@ -531,7 +531,7 @@ func (bc *Blockchain) addHeaders(verify bool, headers ...*block.Header) error {
 			return buf.Err
 		}
 
-		key := storage.AppendPrefix(storage.DataBlock, h.Hash().BytesLE())
+		key := storage.AppendPrefix(storage.DataBlock, h.Hash().BytesBE())
 		batch.Put(key, buf.Bytes())
 		buf.Reset()
 		lastHeader = h
diff --git a/pkg/core/blockchain_test.go b/pkg/core/blockchain_test.go
index d9dfa0e85..bb30d48c0 100644
--- a/pkg/core/blockchain_test.go
+++ b/pkg/core/blockchain_test.go
@@ -114,7 +114,7 @@ func TestAddBlock(t *testing.T) {
 	require.NoError(t, bc.persist())
 
 	for _, block := range blocks {
-		key := storage.AppendPrefix(storage.DataBlock, block.Hash().BytesLE())
+		key := storage.AppendPrefix(storage.DataBlock, block.Hash().BytesBE())
 		_, err := bc.dao.Store.Get(key)
 		require.NoErrorf(t, err, "block %s not persisted", block.Hash())
 	}
diff --git a/pkg/core/dao/dao.go b/pkg/core/dao/dao.go
index 78ff94153..bdbb70a25 100644
--- a/pkg/core/dao/dao.go
+++ b/pkg/core/dao/dao.go
@@ -510,7 +510,7 @@ func makeStorageItemKey(id int32, key []byte) []byte {
 
 // GetBlock returns Block by the given hash if it exists in the store.
 func (dao *Simple) GetBlock(hash util.Uint256) (*block.Block, error) {
-	key := storage.AppendPrefix(storage.DataBlock, hash.BytesLE())
+	key := storage.AppendPrefix(storage.DataBlock, hash.BytesBE())
 	b, err := dao.Store.Get(key)
 	if err != nil {
 		return nil, err
@@ -586,7 +586,7 @@ func (dao *Simple) GetHeaderHashes() ([]util.Uint256, error) {
 // GetTransaction returns Transaction and its height by the given hash
 // if it exists in the store. It does not return dummy transactions.
 func (dao *Simple) GetTransaction(hash util.Uint256) (*transaction.Transaction, uint32, error) {
-	key := storage.AppendPrefix(storage.DataTransaction, hash.BytesLE())
+	key := storage.AppendPrefix(storage.DataTransaction, hash.BytesBE())
 	b, err := dao.Store.Get(key)
 	if err != nil {
 		return nil, 0, err
@@ -637,7 +637,7 @@ func read2000Uint256Hashes(b []byte) ([]util.Uint256, error) {
 // Transaction hash. It returns an error in case if transaction is in chain
 // or in the list of conflicting transactions.
 func (dao *Simple) HasTransaction(hash util.Uint256) error {
-	key := storage.AppendPrefix(storage.DataTransaction, hash.BytesLE())
+	key := storage.AppendPrefix(storage.DataTransaction, hash.BytesBE())
 	bytes, err := dao.Store.Get(key)
 	if err != nil {
 		return nil
@@ -656,7 +656,7 @@ func (dao *Simple) HasTransaction(hash util.Uint256) error {
 // the purpose of value serialization.
 func (dao *Simple) StoreAsBlock(block *block.Block, buf *io.BufBinWriter) error {
 	var (
-		key = storage.AppendPrefix(storage.DataBlock, block.Hash().BytesLE())
+		key = storage.AppendPrefix(storage.DataBlock, block.Hash().BytesBE())
 	)
 	if buf == nil {
 		buf = io.NewBufBinWriter()
@@ -688,7 +688,7 @@ func (dao *Simple) StoreAsCurrentBlock(block *block.Block, buf *io.BufBinWriter)
 // StoreAsTransaction stores given TX as DataTransaction. It can reuse given
 // buffer for the purpose of value serialization.
 func (dao *Simple) StoreAsTransaction(tx *transaction.Transaction, index uint32, buf *io.BufBinWriter) error {
-	key := storage.AppendPrefix(storage.DataTransaction, tx.Hash().BytesLE())
+	key := storage.AppendPrefix(storage.DataTransaction, tx.Hash().BytesBE())
 	if buf == nil {
 		buf = io.NewBufBinWriter()
 	}