diff --git a/_ucoinpy_test/api/bma/test_blockchain.py b/_ucoinpy_test/api/bma/test_blockchain.py
index 73955d7344a0f9295a576f821ef7de77666f80a9..241cf8c1d673600db9f785e209a22968c4808f34 100644
--- a/_ucoinpy_test/api/bma/test_blockchain.py
+++ b/_ucoinpy_test/api/bma/test_blockchain.py
@@ -193,14 +193,16 @@ class Test_BMA_Blockchain(WebFunctionalSetupMixin, unittest.TestCase):
                     "currency": "meta_brouzouf",
                     "membership": "IN",
                     "blockNumber": 0,
-                    "blockHash": "DA39A3EE5E6B4B0D3255BFEF95601890AFD80709"
+                    "blockHash": "DA39A3EE5E6B4B0D3255BFEF95601890AFD80709",
+                    "written": 10005
                 },
                 {
                     "version": 1,
                     "currency": "meta_brouzouf",
                     "membership": "IN",
                     "blockNumber": 31658,
-                    "blockHash": "0000C5336F0B64BFB87FF4BC858AE25726B88175"
+                    "blockHash": "0000C5336F0B64BFB87FF4BC858AE25726B88175",
+                    "written": 43222
                 },
             ]
         }
diff --git a/ucoinpy/api/bma/blockchain/__init__.py b/ucoinpy/api/bma/blockchain/__init__.py
index 62920a1a18f5cd5745c0df43756bb25f35169e08..c4e3829bd0f87e1349e537a67e8da7f6aea99398 100644
--- a/ucoinpy/api/bma/blockchain/__init__.py
+++ b/ucoinpy/api/bma/blockchain/__init__.py
@@ -119,11 +119,11 @@ class Membership(Blockchain):
                         "blockNumber": {
                             "type": "number"
                         },
-                        "blockHash": {
-                            "type": "string"
+                        "written": {
+                            "type": "number"
                         }
                     },
-                    "required": ["version", "currency", "membership", "blockNumber", "blockHash"]
+                    "required": ["version", "currency", "membership", "blockNumber", "blockHash", "written"]
                 }
             }
         },