diff --git a/access/grpc/grpc.go b/access/grpc/grpc.go
index 1d0aed61f..fea0d35bf 100644
--- a/access/grpc/grpc.go
+++ b/access/grpc/grpc.go
@@ -1408,9 +1408,14 @@ func (c *BaseClient) SubscribeBlockDigestsFromStartHeight(
 	blockStatus flow.BlockStatus,
 	opts ...grpc.CallOption,
 ) (<-chan flow.BlockDigest, <-chan error, error) {
+	status := convert.BlockStatusToEntity(blockStatus)
+	if status == entities.BlockStatus_BLOCK_UNKNOWN {
+		return nil, nil, newRPCError(errors.New("unknown block status"))
+	}
+
 	request := &access.SubscribeBlockDigestsFromStartHeightRequest{
 		StartBlockHeight: startHeight,
-		BlockStatus:      convert.BlockStatusToEntity(blockStatus),
+		BlockStatus:      status,
 	}
 
 	subscribeClient, err := c.rpcClient.SubscribeBlockDigestsFromStartHeight(ctx, request, opts...)
@@ -1435,8 +1440,13 @@ func (c *BaseClient) SubscribeBlockDigestsFromLatest(
 	blockStatus flow.BlockStatus,
 	opts ...grpc.CallOption,
 ) (<-chan flow.BlockDigest, <-chan error, error) {
+	status := convert.BlockStatusToEntity(blockStatus)
+	if status == entities.BlockStatus_BLOCK_UNKNOWN {
+		return nil, nil, newRPCError(errors.New("unknown block status"))
+	}
+
 	request := &access.SubscribeBlockDigestsFromLatestRequest{
-		BlockStatus: convert.BlockStatusToEntity(blockStatus),
+		BlockStatus: status,
 	}
 
 	subscribeClient, err := c.rpcClient.SubscribeBlockDigestsFromLatest(ctx, request, opts...)
diff --git a/access/grpc/grpc_test.go b/access/grpc/grpc_test.go
index 975a0d4f2..09e5534a3 100644
--- a/access/grpc/grpc_test.go
+++ b/access/grpc/grpc_test.go
@@ -2571,7 +2571,7 @@ func TestClient_SubscribeBlockDigest(t *testing.T) {
 			On("SubscribeBlockDigestsFromStartHeight", ctx, mock.Anything).
 			Return(stream, nil)
 
-		blockDigestsCh, errCh, err := c.SubscribeBlockDigestsFromStartHeight(ctx, startHeight, flow.BlockStatusUnknown)
+		blockDigestsCh, errCh, err := c.SubscribeBlockDigestsFromStartHeight(ctx, startHeight, flow.BlockStatusSealed)
 		require.NoError(t, err)
 
 		wg := sync.WaitGroup{}
@@ -2602,7 +2602,7 @@ func TestClient_SubscribeBlockDigest(t *testing.T) {
 			Return(stream, nil)
 
 		startBlockID := convert.MessageToIdentifier(stream.responses[0].BlockId)
-		blockDigestsCh, errCh, err := c.SubscribeBlockDigestsFromStartBlockID(ctx, startBlockID, flow.BlockStatusUnknown)
+		blockDigestsCh, errCh, err := c.SubscribeBlockDigestsFromStartBlockID(ctx, startBlockID, flow.BlockStatusSealed)
 		require.NoError(t, err)
 
 		wg := sync.WaitGroup{}
@@ -2632,7 +2632,7 @@ func TestClient_SubscribeBlockDigest(t *testing.T) {
 			On("SubscribeBlockDigestsFromLatest", ctx, mock.Anything).
 			Return(stream, nil)
 
-		blockDigestsCh, errCh, err := c.SubscribeBlockDigestsFromLatest(ctx, flow.BlockStatusUnknown)
+		blockDigestsCh, errCh, err := c.SubscribeBlockDigestsFromLatest(ctx, flow.BlockStatusSealed)
 		require.NoError(t, err)
 
 		wg := sync.WaitGroup{}
@@ -2660,7 +2660,7 @@ func TestClient_SubscribeBlockDigest(t *testing.T) {
 			On("SubscribeBlockDigestsFromLatest", ctx, mock.Anything).
 			Return(stream, nil)
 
-		blockDigestsCh, errCh, err := c.SubscribeBlockDigestsFromLatest(ctx, flow.BlockStatusUnknown)
+		blockDigestsCh, errCh, err := c.SubscribeBlockDigestsFromLatest(ctx, flow.BlockStatusSealed)
 		require.NoError(t, err)
 
 		wg := sync.WaitGroup{}