diff --git a/code/go/0chain.net/blobbercore/allocation/renamefilechange_test.go b/code/go/0chain.net/blobbercore/allocation/renamefilechange_test.go
index 099be443d..b7a135aaa 100644
--- a/code/go/0chain.net/blobbercore/allocation/renamefilechange_test.go
+++ b/code/go/0chain.net/blobbercore/allocation/renamefilechange_test.go
@@ -21,6 +21,7 @@ import (
 	coreNetwork "github.com/0chain/gosdk/core/conf"
 	"github.com/0chain/gosdk/core/zcncrypto"
 	zencryption "github.com/0chain/gosdk/zboxcore/encryption"
+	"github.com/0chain/gosdk/zboxcore/fileref"
 	"github.com/0chain/gosdk/zcncore"
 	"github.com/DATA-DOG/go-sqlmock"
 	mocket "github.com/selvatico/go-mocket"
@@ -37,13 +38,19 @@ func resetMockFileBlock() {
 
 var encscheme zencryption.EncryptionScheme
 
+// getLookupHash generates a deterministic lookup hash for testing
+func getLookupHash() string {
+	return fileref.GetReferenceLookup("test-allocation-id", "/test/file/path")
+}
+
 func setupEncryptionScheme() {
 	encscheme = zencryption.NewEncryptionScheme()
 	mnemonic := client.GetClient().Mnemonic
 	if _, err := encscheme.Initialize(mnemonic); err != nil {
 		panic("initialize encscheme")
 	}
-	encscheme.InitForEncryption("filetype:audio")
+	lookupHash := getLookupHash()
+	encscheme.InitForEncryption(lookupHash)
 }
 
 func setup(t *testing.T) {
diff --git a/code/go/0chain.net/blobbercore/handler/chunk_encoder.go b/code/go/0chain.net/blobbercore/handler/chunk_encoder.go
index 6665b9dac..c51958b87 100644
--- a/code/go/0chain.net/blobbercore/handler/chunk_encoder.go
+++ b/code/go/0chain.net/blobbercore/handler/chunk_encoder.go
@@ -27,6 +27,7 @@ type PREChunkEncoder struct {
 	EncryptedKey              string
 	ReEncryptionKey           string
 	ClientEncryptionPublicKey string
+	LookupHash                string
 }
 
 // Encode encode chunk data with PREEncryptionScheme for subscriber to download it
@@ -36,7 +37,7 @@ func (r *PREChunkEncoder) Encode(chunkSize int, data []byte) ([]byte, error) {
 		return nil, err
 	}
 
-	if err := encscheme.InitForDecryption("filetype:audio", r.EncryptedKey); err != nil {
+	if err := encscheme.InitForDecryption(r.LookupHash, r.EncryptedKey); err != nil {
 		return nil, err
 	}
 
diff --git a/code/go/0chain.net/blobbercore/handler/handler_download_test.go b/code/go/0chain.net/blobbercore/handler/handler_download_test.go
index 7449e1ada..ffeadd565 100644
--- a/code/go/0chain.net/blobbercore/handler/handler_download_test.go
+++ b/code/go/0chain.net/blobbercore/handler/handler_download_test.go
@@ -45,12 +45,18 @@ func setupDownloadHandlers() (*mux.Router, map[string]string) {
 	}
 }
 
+// getLookupHash generates a deterministic lookup hash for testing
+func getLookupHash() string {
+	return fileref.GetReferenceLookup("test-allocation-id", "/test/file/path")
+}
+
 func getEncryptionScheme(mnemonic string) (zencryption.EncryptionScheme, error) {
 	encscheme := zencryption.NewEncryptionScheme()
 	if _, err := encscheme.Initialize(mnemonic); err != nil {
 		return nil, err
 	}
-	encscheme.InitForEncryption("filetype:audio")
+	lookupHash := getLookupHash()
+	encscheme.InitForEncryption(lookupHash)
 	return encscheme, nil
 }
 
@@ -623,7 +629,8 @@ func TestHandlers_Download(t *testing.T) {
 				if err != nil {
 					t.Fatal(err)
 				}
-				reEncryptionKey, err := ownerScheme.GetReGenKey(guestPublicEncryptedKey, "filetype:audio")
+				lookupHash := getLookupHash()
+				reEncryptionKey, err := ownerScheme.GetReGenKey(guestPublicEncryptedKey, lookupHash)
 
 				if err != nil {
 					t.Fatal(err)
@@ -746,7 +753,8 @@ func TestHandlers_Download(t *testing.T) {
 					t.Fatal(err)
 				}
 
-				reEncryptionKey, _ := ownerScheme.GetReGenKey(gpbk, "filetype:audio")
+				lookupHash := getLookupHash()
+				reEncryptionKey, _ := ownerScheme.GetReGenKey(gpbk, lookupHash)
 				mock.ExpectQuery(regexp.QuoteMeta(`SELECT * FROM "marketplace_share_info" WHERE`)).
 					WithArgs(guestClient.ClientID, rootPathHash).
 					WillReturnRows(
@@ -866,7 +874,8 @@ func TestHandlers_Download(t *testing.T) {
 					t.Fatal(err)
 				}
 
-				reEncryptionKey, _ := ownerScheme.GetReGenKey(gpbk, "filetype:audio")
+				lookupHash := getLookupHash()
+				reEncryptionKey, _ := ownerScheme.GetReGenKey(gpbk, lookupHash)
 				mock.ExpectQuery(regexp.QuoteMeta(`SELECT * FROM "marketplace_share_info" WHERE`)).
 					WithArgs(guestClient.ClientID, rootPathHash).
 					WillReturnRows(
diff --git a/code/go/0chain.net/blobbercore/handler/object_operation_handler.go b/code/go/0chain.net/blobbercore/handler/object_operation_handler.go
index 29afc3bc5..829af574d 100644
--- a/code/go/0chain.net/blobbercore/handler/object_operation_handler.go
+++ b/code/go/0chain.net/blobbercore/handler/object_operation_handler.go
@@ -526,6 +526,7 @@ func (fsh *StorageHandler) DownloadFile(ctx context.Context, r *http.Request) (i
 			EncryptedKey:              fileref.EncryptedKey,
 			ReEncryptionKey:           shareInfo.ReEncryptionKey,
 			ClientEncryptionPublicKey: shareInfo.ClientEncryptionPublicKey,
+			LookupHash:                fileref.LookupHash,
 		}
 	} else {
 		chunkEncoder = &RawChunkEncoder{}
diff --git a/code/go/0chain.net/blobbercore/readmarker/authticket.go b/code/go/0chain.net/blobbercore/readmarker/authticket.go
index f97842584..5f692d1a6 100644
--- a/code/go/0chain.net/blobbercore/readmarker/authticket.go
+++ b/code/go/0chain.net/blobbercore/readmarker/authticket.go
@@ -19,7 +19,6 @@ type AuthTicket struct {
 	OwnerID             string           `json:"owner_id"`
 	AllocationID        string           `json:"allocation_id"`
 	FilePathHash        string           `json:"file_path_hash"`
-	ActualFileHash      string           `json:"actual_file_hash"`
 	FileName            string           `json:"file_name"`
 	RefType             string           `json:"reference_type"`
 	Expiration          common.Timestamp `json:"expiration"`
@@ -41,7 +40,6 @@ func (rm *AuthTicket) GetHashData() string {
 		rm.ReEncryptionKey,
 		rm.Expiration,
 		rm.Timestamp,
-		rm.ActualFileHash,
 		rm.Encrypted,
 	)
 	return hashData