diff --git a/skynet/dgpu.py b/skynet/dgpu.py
index 763fdd1..209dbc3 100644
--- a/skynet/dgpu.py
+++ b/skynet/dgpu.py
@@ -174,7 +174,10 @@ async def open_dgpu_node(
                 lower_bound=int(time.time()) - 3600
             )
 
-        except asks.errors.RequestTimeout:
+        except (
+            asks.errors.RequestTimeout,
+            json.JSONDecodeError
+        ):
             return []
 
     async def get_status_by_request_id(request_id: int):
@@ -201,16 +204,6 @@ async def open_dgpu_node(
         else:
             return None
 
-    async def get_user_nonce(user: str):
-        logging.info('get_user_nonce')
-        return (await cleos.aget_table(
-            'telos.gpu', 'telos.gpu', 'users',
-            index_position=1,
-            key_type='name',
-            lower_bound=user,
-            upper_bound=user
-        ))[0]['nonce']
-
     async def begin_work(request_id: int):
         logging.info('begin_work')
         return await cleos.a_push_action(
@@ -218,7 +211,8 @@ async def open_dgpu_node(
             'workbegin',
             {
                 'worker': Name(account),
-                'request_id': request_id
+                'request_id': request_id,
+                'max_workers': 2
             },
             account, key,
             permission=permission
@@ -328,7 +322,7 @@ async def open_dgpu_node(
                     if rid not in my_results:
                         statuses = await get_status_by_request_id(rid)
 
-                        if len(statuses) < config['verification_amount']:
+                        if len(statuses) < req['min_verification']:
 
                             # parse request
                             body = json.loads(req['body'])
diff --git a/skynet/frontend/telegram/__init__.py b/skynet/frontend/telegram/__init__.py
index ecd66fd..f417842 100644
--- a/skynet/frontend/telegram/__init__.py
+++ b/skynet/frontend/telegram/__init__.py
@@ -148,7 +148,8 @@ class SkynetTelegramFrontend:
                 'user': Name(self.account),
                 'request_body': body,
                 'binary_data': binary_data,
-                'reward': asset_from_str(reward)
+                'reward': asset_from_str(reward),
+                'min_verification': 1
             },
             self.account, self.key, permission=self.permission
         )
diff --git a/skynet/nodeos.py b/skynet/nodeos.py
index b853208..dddc935 100644
--- a/skynet/nodeos.py
+++ b/skynet/nodeos.py
@@ -145,7 +145,7 @@ def open_nodeos(cleanup: bool = True):
         ec, out = cleos.push_action(
             'telos.gpu',
             'config',
-            [1, 'eosio.token', '4,GPU'],
+            ['eosio.token', '4,GPU'],
             f'telos.gpu@active'
         )
         assert ec == 0
diff --git a/tests/contracts/telos.gpu/telos.gpu.abi b/tests/contracts/telos.gpu/telos.gpu.abi
index 406c268..f3708bf 100644
--- a/tests/contracts/telos.gpu/telos.gpu.abi
+++ b/tests/contracts/telos.gpu/telos.gpu.abi
@@ -21,6 +21,40 @@
                 }
             ]
         },
+        {
+            "name": "card",
+            "base": "",
+            "fields": [
+                {
+                    "name": "id",
+                    "type": "uint64"
+                },
+                {
+                    "name": "owner",
+                    "type": "name"
+                },
+                {
+                    "name": "card_name",
+                    "type": "string"
+                },
+                {
+                    "name": "version",
+                    "type": "string"
+                },
+                {
+                    "name": "total_memory",
+                    "type": "uint64"
+                },
+                {
+                    "name": "mp_count",
+                    "type": "uint32"
+                },
+                {
+                    "name": "extra",
+                    "type": "string"
+                }
+            ]
+        },
         {
             "name": "clean",
             "base": "",
@@ -30,10 +64,6 @@
             "name": "config",
             "base": "",
             "fields": [
-                {
-                    "name": "verification_amount",
-                    "type": "uint8"
-                },
                 {
                     "name": "token_contract",
                     "type": "name"
@@ -72,11 +102,15 @@
                 },
                 {
                     "name": "binary_data",
-                    "type": "bytes"
+                    "type": "string"
                 },
                 {
                     "name": "reward",
                     "type": "asset"
+                },
+                {
+                    "name": "min_verification",
+                    "type": "uint32"
                 }
             ]
         },
@@ -84,10 +118,6 @@
             "name": "global_configuration_struct",
             "base": "",
             "fields": [
-                {
-                    "name": "verification_amount",
-                    "type": "uint8"
-                },
                 {
                     "name": "token_contract",
                     "type": "name"
@@ -154,13 +184,21 @@
                     "name": "reward",
                     "type": "asset"
                 },
+                {
+                    "name": "min_verification",
+                    "type": "uint32"
+                },
+                {
+                    "name": "nonce",
+                    "type": "uint64"
+                },
                 {
                     "name": "body",
                     "type": "string"
                 },
                 {
                     "name": "binary_data",
-                    "type": "bytes"
+                    "type": "string"
                 },
                 {
                     "name": "timestamp",
@@ -213,6 +251,10 @@
                 {
                     "name": "request_id",
                     "type": "uint64"
+                },
+                {
+                    "name": "max_workers",
+                    "type": "uint32"
                 }
             ]
         },
@@ -234,6 +276,28 @@
                 }
             ]
         },
+        {
+            "name": "worker",
+            "base": "",
+            "fields": [
+                {
+                    "name": "account",
+                    "type": "name"
+                },
+                {
+                    "name": "joined",
+                    "type": "time_point_sec"
+                },
+                {
+                    "name": "left",
+                    "type": "time_point_sec"
+                },
+                {
+                    "name": "url",
+                    "type": "string"
+                }
+            ]
+        },
         {
             "name": "worker_status_struct",
             "base": "",
@@ -296,6 +360,13 @@
         }
     ],
     "tables": [
+        {
+            "name": "cards",
+            "type": "card",
+            "index_type": "i64",
+            "key_names": [],
+            "key_types": []
+        },
         {
             "name": "config",
             "type": "global_configuration_struct",
@@ -330,6 +401,13 @@
             "index_type": "i64",
             "key_names": [],
             "key_types": []
+        },
+        {
+            "name": "workers",
+            "type": "worker",
+            "index_type": "i64",
+            "key_names": [],
+            "key_types": []
         }
     ],
     "ricardian_clauses": [],
diff --git a/tests/contracts/telos.gpu/telos.gpu.wasm b/tests/contracts/telos.gpu/telos.gpu.wasm
index 18dc265..6881852 100755
Binary files a/tests/contracts/telos.gpu/telos.gpu.wasm and b/tests/contracts/telos.gpu/telos.gpu.wasm differ