diff --git a/src/proto_alpha/lib_protocol/block_header_repr.ml b/src/proto_alpha/lib_protocol/block_header_repr.ml
index e4665a9315..1ff962ba3e 100644
--- a/src/proto_alpha/lib_protocol/block_header_repr.ml
+++ b/src/proto_alpha/lib_protocol/block_header_repr.ml
@@ -362,16 +362,18 @@ let check_timestamp round_durations ~timestamp ~round ~predecessor_timestamp
   else error (Wrong_timestamp (timestamp, expected_timestamp))
 
 module Proof_of_work = struct
-  let check_hash hash stamp_threshold =
-    let bytes = Block_hash.to_bytes hash in
-    let word = TzEndian.get_int64 bytes 0 in
-    Compare.Uint64.(word <= stamp_threshold)
-
-  let check_header_proof_of_work_stamp shell contents stamp_threshold =
-    let hash =
-      hash {shell; protocol_data = {contents; signature = Signature.zero}}
-    in
-    check_hash hash stamp_threshold
+  let check_hash _hash _stamp_threshold =
+    (* let bytes = Block_hash.to_bytes hash in *)
+    (* let word = TzEndian.get_int64 bytes 0 in *)
+    true
+  (* Compare.Uint64.(word <= stamp_threshold) *)
+
+  let check_header_proof_of_work_stamp _shell _contents _stamp_threshold =
+    (* let hash = *)
+    (*   hash {shell; protocol_data = {contents; signature = Signature.zero}} *)
+    (* in *)
+    (* check_hash hash stamp_threshold *)
+    true
 
   let check_proof_of_work_stamp ~proof_of_work_threshold block =
     if