1 files changed, 11 insertions, 0 deletions
diff --git a/core/error.go b/core/error.go
index 09eea22d6..ff58d69d6 100644
--- a/core/error.go
+++ b/core/error.go
@@ -177,3 +177,14 @@ func IsValueTransferErr(e error) bool {
 	_, ok := e.(*ValueTransferError)
 	return ok
 }
+
+type BadHashError common.Hash
+
+func (h BadHashError) Error() string {
+	return fmt.Sprintf("Found known bad hash in chain %x", h)
+}
+
+func IsBadHashError(err error) bool {
+	_, ok := err.(BadHashError)
+	return ok
+}