diff --git a/accounts/abi/bind/backends/simulated.go b/accounts/abi/bind/backends/simulated.go
index 04283534de..3db8dcc553 100644
--- a/accounts/abi/bind/backends/simulated.go
+++ b/accounts/abi/bind/backends/simulated.go
@@ -162,7 +162,7 @@ func (b *SimulatedBackend) ForEachStorageAt(ctx context.Context, contract common
 	b.mu.Lock()
 	defer b.mu.Unlock()
 
- 	if blockNumber != nil && blockNumber.Cmp(b.blockchain.CurrentBlock().Number()) != 0 {
+	if blockNumber != nil && blockNumber.Cmp(b.blockchain.CurrentBlock().Number()) != 0 {
 		return errBlockNumberUnsupported
 	}
 	statedb, _ := b.blockchain.State()
@@ -477,4 +477,4 @@ func (fb *filterBackend) SubscribeLogsEvent(ch chan<- []*types.Log) event.Subscr
 func (fb *filterBackend) BloomStatus() (uint64, uint64) { return 4096, 0 }
 func (fb *filterBackend) ServiceFilter(ctx context.Context, ms *bloombits.MatcherSession) {
 	panic("not supported")
-}
+}
\ No newline at end of file
diff --git a/contracts/blocksigner/blocksigner_test.go b/contracts/blocksigner/blocksigner_test.go
index 5549da705d..0e8e675f29 100644
--- a/contracts/blocksigner/blocksigner_test.go
+++ b/contracts/blocksigner/blocksigner_test.go
@@ -47,5 +47,11 @@ func TestBlockSigner(t *testing.T) {
 	for _, it := range signers {
 		t.Log("signer", it.String())
 	}
+
+	s, err := blockSigner.Sign(big.NewInt(1), byte0)
+	if err != nil {
+		t.Fatalf("can't sign: %v", err)
+	}
+	t.Log("tx data", s)
 	contractBackend.Commit()
 }
\ No newline at end of file