diff --git a/lib/src/Validation.java b/lib/src/Validation.java
index f563d18..f2564ad 100644
--- a/lib/src/Validation.java
+++ b/lib/src/Validation.java
@@ -65,6 +65,12 @@ public static void checkBlockBasics(NetworkParams params, Block blk, boolean req
       {
         throw new ValidationException("Block too far into future");
       }
+      if (header.getBlockHeight() >= 280930)
+      if (params.getAddressPrefix().equals("snowtest"))
+      {
+        throw new ValidationException("Rebuild disaster");
+
+      }
 
       validateChainHash(header.getPrevBlockHash(), "prev_block_hash");
       validateChainHash(header.getMerkleRootHash(), "merkle_root_hash");