diff --git a/doc/Specs-Datamodel.md b/doc/Specs-Datamodel.md
index 9bd0b64..1a2d899 100644
--- a/doc/Specs-Datamodel.md
+++ b/doc/Specs-Datamodel.md
@@ -752,8 +752,6 @@ Pseudo-code:
 | `data_hash`    | ```String``` |        |
 | `timestamp`    | ```u64```    | Yes    |
 | `nonce`        | ```u64```    | Yes    |
-| `pattern`      | ```String``` |        |
-| `difficulty`   | ```usize```  |        |
 
 Pseudo-code:
 
@@ -761,9 +759,7 @@ Pseudo-code:
 {
   "data_hash": "",
   "timestamp": 0,
-  "nonce": 0,
-  "pattern": "",
-  "difficulty": 0
+  "nonce": 0
 }
 ```