diff --git a/chains/chains.json b/chains/chains.json
index 252cc18..197a238 100644
--- a/chains/chains.json
+++ b/chains/chains.json
@@ -6655,50 +6655,6 @@
     "icon": "https://raw.githubusercontent.com/novasamatech/nova-utils/master/icons/chains/gradient/Aventus.svg",
     "addressPrefix": 42
   },
-  {
-    "chainId": "eip155:2109",
-    "name": "Exosama",
-    "assets": [
-      {
-        "assetId": 0,
-        "symbol": "SAMA",
-        "priceId": "exosama-network",
-        "type": "evmNative",
-        "icon": "SAMA.svg",
-        "precision": 18
-      }
-    ],
-    "nodes": [
-      {
-        "url": "wss://rpc.exosama.com",
-        "name": "Exosama node"
-      }
-    ],
-    "explorers": [
-      {
-        "name": "Exosama explorer",
-        "extrinsic": "https://explorer.exosama.com/tx/{hash}",
-        "account": "https://explorer.exosama.com/address/{address}"
-      }
-    ],
-    "externalApi": {
-      "history": [
-        {
-          "type": "etherscan",
-          "url": "https://explorer.exosama.com/api",
-          "parameters": {
-            "assetType": "evm"
-          }
-        }
-      ]
-    },
-    "icon": "https://raw.githubusercontent.com/novasamatech/nova-utils/master/icons/chains/gradient/Exosama.svg",
-    "addressPrefix": 2109,
-    "options": [
-      "ethereumBased",
-      "noSubstrateRuntime"
-    ]
-  },
   {
     "chainId": "2f0555cc76fc2840a25a6ea3b9637146806f1f44b090c175ffde2a7e5ab36c03",
     "name": "Bittensor",
@@ -6874,57 +6830,6 @@
       "ethereumBased"
     ]
   },
-  {
-    "chainId": "86e49c195aeae7c5c4a86ced251f1a28c67b3c35d8289c387ede1776cdd88b24",
-    "parentId": "b0a8d493285c2df73290dfb7e61f870f17b41801197a149ca93654499ea3dafe",
-    "name": "Crab",
-    "assets": [
-      {
-        "assetId": 0,
-        "symbol": "CRAB",
-        "precision": 18,
-        "priceId": "darwinia-network-native-token",
-        "icon": "CRAB.svg"
-      },
-      {
-        "assetId": 1,
-        "symbol": "CKTON",
-        "precision": 18,
-        "type": "statemine",
-        "icon": "CKTON.svg",
-        "typeExtras": {
-          "assetId": "1026",
-          "isSufficient": true
-        }
-      }
-    ],
-    "nodes": [
-      {
-        "url": "wss://crab-rpc.darwinia.network/",
-        "name": "Darwinia node"
-      }
-    ],
-    "explorers": [
-      {
-        "name": "Subscan",
-        "extrinsic": "https://crab.subscan.io/extrinsic/{hash}",
-        "account": "https://crab.subscan.io/account/{address}"
-      }
-    ],
-    "externalApi": {
-      "history": [
-        {
-          "type": "subquery",
-          "url": "https://subquery-history-crab-prod.novasama-tech.org"
-        }
-      ]
-    },
-    "icon": "https://raw.githubusercontent.com/novasamatech/nova-utils/master/icons/chains/gradient/Crab.svg",
-    "addressPrefix": 42,
-    "options": [
-      "ethereumBased"
-    ]
-  },
   {
     "chainId": "4a587bf17a404e3572747add7aab7bbe56e805a5479c6c436f07f36fcc8d3ae1",
     "parentId": "91b171bb158e2d3848fa23a9f1c25182fb8e20313b2c1eb49219da7a70ce90c3",
@@ -8136,34 +8041,6 @@
     "icon": "https://raw.githubusercontent.com/novasamatech/nova-utils/master/icons/chains/gradient/Humanode.svg",
     "addressPrefix": 5234
   },
-  {
-    "chainId": "03aa6b475a03f8baf7f83e448513b00eaab03aefa4ed64bd1d31160dce028add",
-    "name": "DeepBrain",
-    "assets": [
-      {
-        "assetId": 0,
-        "symbol": "DBC",
-        "precision": 15,
-        "priceId": "deepbrain-chain",
-        "icon": "DBC.svg"
-      }
-    ],
-    "nodes": [
-      {
-        "url": "wss://info.dbcwallet.io",
-        "name": "DBC node"
-      }
-    ],
-    "explorers": [
-      {
-        "name": "Subscan",
-        "extrinsic": "https://dbc.subscan.io/extrinsic/{hash}",
-        "account": "https://dbc.subscan.io/account/{address}"
-      }
-    ],
-    "icon": "https://raw.githubusercontent.com/novasamatech/nova-utils/master/icons/chains/gradient/DeepBrain.svg",
-    "addressPrefix": 42
-  },
   {
     "chainId": "d2a5d385932d1f650dae03ef8e2748983779ee342c614f80854d32b8cd8fa48c",
     "parentId": "91b171bb158e2d3848fa23a9f1c25182fb8e20313b2c1eb49219da7a70ce90c3",
diff --git a/chains/v22/android/chains.json b/chains/v22/android/chains.json
index 252cc18..197a238 100644
--- a/chains/v22/android/chains.json
+++ b/chains/v22/android/chains.json
@@ -6655,50 +6655,6 @@
     "icon": "https://raw.githubusercontent.com/novasamatech/nova-utils/master/icons/chains/gradient/Aventus.svg",
     "addressPrefix": 42
   },
-  {
-    "chainId": "eip155:2109",
-    "name": "Exosama",
-    "assets": [
-      {
-        "assetId": 0,
-        "symbol": "SAMA",
-        "priceId": "exosama-network",
-        "type": "evmNative",
-        "icon": "SAMA.svg",
-        "precision": 18
-      }
-    ],
-    "nodes": [
-      {
-        "url": "wss://rpc.exosama.com",
-        "name": "Exosama node"
-      }
-    ],
-    "explorers": [
-      {
-        "name": "Exosama explorer",
-        "extrinsic": "https://explorer.exosama.com/tx/{hash}",
-        "account": "https://explorer.exosama.com/address/{address}"
-      }
-    ],
-    "externalApi": {
-      "history": [
-        {
-          "type": "etherscan",
-          "url": "https://explorer.exosama.com/api",
-          "parameters": {
-            "assetType": "evm"
-          }
-        }
-      ]
-    },
-    "icon": "https://raw.githubusercontent.com/novasamatech/nova-utils/master/icons/chains/gradient/Exosama.svg",
-    "addressPrefix": 2109,
-    "options": [
-      "ethereumBased",
-      "noSubstrateRuntime"
-    ]
-  },
   {
     "chainId": "2f0555cc76fc2840a25a6ea3b9637146806f1f44b090c175ffde2a7e5ab36c03",
     "name": "Bittensor",
@@ -6874,57 +6830,6 @@
       "ethereumBased"
     ]
   },
-  {
-    "chainId": "86e49c195aeae7c5c4a86ced251f1a28c67b3c35d8289c387ede1776cdd88b24",
-    "parentId": "b0a8d493285c2df73290dfb7e61f870f17b41801197a149ca93654499ea3dafe",
-    "name": "Crab",
-    "assets": [
-      {
-        "assetId": 0,
-        "symbol": "CRAB",
-        "precision": 18,
-        "priceId": "darwinia-network-native-token",
-        "icon": "CRAB.svg"
-      },
-      {
-        "assetId": 1,
-        "symbol": "CKTON",
-        "precision": 18,
-        "type": "statemine",
-        "icon": "CKTON.svg",
-        "typeExtras": {
-          "assetId": "1026",
-          "isSufficient": true
-        }
-      }
-    ],
-    "nodes": [
-      {
-        "url": "wss://crab-rpc.darwinia.network/",
-        "name": "Darwinia node"
-      }
-    ],
-    "explorers": [
-      {
-        "name": "Subscan",
-        "extrinsic": "https://crab.subscan.io/extrinsic/{hash}",
-        "account": "https://crab.subscan.io/account/{address}"
-      }
-    ],
-    "externalApi": {
-      "history": [
-        {
-          "type": "subquery",
-          "url": "https://subquery-history-crab-prod.novasama-tech.org"
-        }
-      ]
-    },
-    "icon": "https://raw.githubusercontent.com/novasamatech/nova-utils/master/icons/chains/gradient/Crab.svg",
-    "addressPrefix": 42,
-    "options": [
-      "ethereumBased"
-    ]
-  },
   {
     "chainId": "4a587bf17a404e3572747add7aab7bbe56e805a5479c6c436f07f36fcc8d3ae1",
     "parentId": "91b171bb158e2d3848fa23a9f1c25182fb8e20313b2c1eb49219da7a70ce90c3",
@@ -8136,34 +8041,6 @@
     "icon": "https://raw.githubusercontent.com/novasamatech/nova-utils/master/icons/chains/gradient/Humanode.svg",
     "addressPrefix": 5234
   },
-  {
-    "chainId": "03aa6b475a03f8baf7f83e448513b00eaab03aefa4ed64bd1d31160dce028add",
-    "name": "DeepBrain",
-    "assets": [
-      {
-        "assetId": 0,
-        "symbol": "DBC",
-        "precision": 15,
-        "priceId": "deepbrain-chain",
-        "icon": "DBC.svg"
-      }
-    ],
-    "nodes": [
-      {
-        "url": "wss://info.dbcwallet.io",
-        "name": "DBC node"
-      }
-    ],
-    "explorers": [
-      {
-        "name": "Subscan",
-        "extrinsic": "https://dbc.subscan.io/extrinsic/{hash}",
-        "account": "https://dbc.subscan.io/account/{address}"
-      }
-    ],
-    "icon": "https://raw.githubusercontent.com/novasamatech/nova-utils/master/icons/chains/gradient/DeepBrain.svg",
-    "addressPrefix": 42
-  },
   {
     "chainId": "d2a5d385932d1f650dae03ef8e2748983779ee342c614f80854d32b8cd8fa48c",
     "parentId": "91b171bb158e2d3848fa23a9f1c25182fb8e20313b2c1eb49219da7a70ce90c3",
diff --git a/chains/v22/chains.json b/chains/v22/chains.json
index 252cc18..197a238 100644
--- a/chains/v22/chains.json
+++ b/chains/v22/chains.json
@@ -6655,50 +6655,6 @@
     "icon": "https://raw.githubusercontent.com/novasamatech/nova-utils/master/icons/chains/gradient/Aventus.svg",
     "addressPrefix": 42
   },
-  {
-    "chainId": "eip155:2109",
-    "name": "Exosama",
-    "assets": [
-      {
-        "assetId": 0,
-        "symbol": "SAMA",
-        "priceId": "exosama-network",
-        "type": "evmNative",
-        "icon": "SAMA.svg",
-        "precision": 18
-      }
-    ],
-    "nodes": [
-      {
-        "url": "wss://rpc.exosama.com",
-        "name": "Exosama node"
-      }
-    ],
-    "explorers": [
-      {
-        "name": "Exosama explorer",
-        "extrinsic": "https://explorer.exosama.com/tx/{hash}",
-        "account": "https://explorer.exosama.com/address/{address}"
-      }
-    ],
-    "externalApi": {
-      "history": [
-        {
-          "type": "etherscan",
-          "url": "https://explorer.exosama.com/api",
-          "parameters": {
-            "assetType": "evm"
-          }
-        }
-      ]
-    },
-    "icon": "https://raw.githubusercontent.com/novasamatech/nova-utils/master/icons/chains/gradient/Exosama.svg",
-    "addressPrefix": 2109,
-    "options": [
-      "ethereumBased",
-      "noSubstrateRuntime"
-    ]
-  },
   {
     "chainId": "2f0555cc76fc2840a25a6ea3b9637146806f1f44b090c175ffde2a7e5ab36c03",
     "name": "Bittensor",
@@ -6874,57 +6830,6 @@
       "ethereumBased"
     ]
   },
-  {
-    "chainId": "86e49c195aeae7c5c4a86ced251f1a28c67b3c35d8289c387ede1776cdd88b24",
-    "parentId": "b0a8d493285c2df73290dfb7e61f870f17b41801197a149ca93654499ea3dafe",
-    "name": "Crab",
-    "assets": [
-      {
-        "assetId": 0,
-        "symbol": "CRAB",
-        "precision": 18,
-        "priceId": "darwinia-network-native-token",
-        "icon": "CRAB.svg"
-      },
-      {
-        "assetId": 1,
-        "symbol": "CKTON",
-        "precision": 18,
-        "type": "statemine",
-        "icon": "CKTON.svg",
-        "typeExtras": {
-          "assetId": "1026",
-          "isSufficient": true
-        }
-      }
-    ],
-    "nodes": [
-      {
-        "url": "wss://crab-rpc.darwinia.network/",
-        "name": "Darwinia node"
-      }
-    ],
-    "explorers": [
-      {
-        "name": "Subscan",
-        "extrinsic": "https://crab.subscan.io/extrinsic/{hash}",
-        "account": "https://crab.subscan.io/account/{address}"
-      }
-    ],
-    "externalApi": {
-      "history": [
-        {
-          "type": "subquery",
-          "url": "https://subquery-history-crab-prod.novasama-tech.org"
-        }
-      ]
-    },
-    "icon": "https://raw.githubusercontent.com/novasamatech/nova-utils/master/icons/chains/gradient/Crab.svg",
-    "addressPrefix": 42,
-    "options": [
-      "ethereumBased"
-    ]
-  },
   {
     "chainId": "4a587bf17a404e3572747add7aab7bbe56e805a5479c6c436f07f36fcc8d3ae1",
     "parentId": "91b171bb158e2d3848fa23a9f1c25182fb8e20313b2c1eb49219da7a70ce90c3",
@@ -8136,34 +8041,6 @@
     "icon": "https://raw.githubusercontent.com/novasamatech/nova-utils/master/icons/chains/gradient/Humanode.svg",
     "addressPrefix": 5234
   },
-  {
-    "chainId": "03aa6b475a03f8baf7f83e448513b00eaab03aefa4ed64bd1d31160dce028add",
-    "name": "DeepBrain",
-    "assets": [
-      {
-        "assetId": 0,
-        "symbol": "DBC",
-        "precision": 15,
-        "priceId": "deepbrain-chain",
-        "icon": "DBC.svg"
-      }
-    ],
-    "nodes": [
-      {
-        "url": "wss://info.dbcwallet.io",
-        "name": "DBC node"
-      }
-    ],
-    "explorers": [
-      {
-        "name": "Subscan",
-        "extrinsic": "https://dbc.subscan.io/extrinsic/{hash}",
-        "account": "https://dbc.subscan.io/account/{address}"
-      }
-    ],
-    "icon": "https://raw.githubusercontent.com/novasamatech/nova-utils/master/icons/chains/gradient/DeepBrain.svg",
-    "addressPrefix": 42
-  },
   {
     "chainId": "d2a5d385932d1f650dae03ef8e2748983779ee342c614f80854d32b8cd8fa48c",
     "parentId": "91b171bb158e2d3848fa23a9f1c25182fb8e20313b2c1eb49219da7a70ce90c3",
diff --git a/pezkuwi-overlay/chains/allowed-chains.json b/pezkuwi-overlay/chains/allowed-chains.json
new file mode 100644
index 0000000..85bd67c
--- /dev/null
+++ b/pezkuwi-overlay/chains/allowed-chains.json
@@ -0,0 +1,41 @@
+{
+  "description": "Only these chains will be included in the final config",
+  "mode": "whitelist",
+  "chains": [
+    {
+      "id": "bb4a61ab0c4b8c12f5eab71d0c86c482e03a275ecdafee678dea712474d33d75",
+      "name": "Pezkuwi",
+      "source": "pezkuwi"
+    },
+    {
+      "id": "96eb58af1bb7288115b5e4ff1590422533e749293f231974536dc6672417d06f",
+      "name": "Zagros Testnet",
+      "source": "pezkuwi"
+    },
+    {
+      "id": "00d0e1d0581c3cd5c5768652d52f4520184018b44f56a2ae1e0dc9d65c00c948",
+      "name": "Pezkuwi Asset Hub",
+      "source": "pezkuwi"
+    },
+    {
+      "id": "4d65bfa31a77bdde8a4fbb1b289c16a6cd3c246793ee8ba2d98a5b3e04ba59ea",
+      "name": "Pezkuwi People",
+      "source": "pezkuwi"
+    },
+    {
+      "id": "91b171bb158e2d3848fa23a9f1c25182fb8e20313b2c1eb49219da7a70ce90c3",
+      "name": "Polkadot",
+      "source": "nova"
+    },
+    {
+      "id": "68d56f15f85d3136970ec16946040bc1752654e906147f7e43e9d539d7c3de2f",
+      "name": "Polkadot Asset Hub",
+      "source": "nova"
+    },
+    {
+      "id": "67fa177a097bfa18f77ea95ab56e9bcdfeb0e5b8a40e46298bb93e16b6fc5f6f",
+      "name": "Polkadot People",
+      "source": "nova"
+    }
+  ]
+}
diff --git a/pezkuwi-overlay/chains/blocked-chains.json b/pezkuwi-overlay/chains/blocked-chains.json
index 68f1dd4..ae57bd5 100644
--- a/pezkuwi-overlay/chains/blocked-chains.json
+++ b/pezkuwi-overlay/chains/blocked-chains.json
@@ -19,12 +19,27 @@
     {
       "name": "Passet Hub Testnet",
       "reason": "testnet-passet-hub-eth-rpc.polkadot.io unreachable"
+    },
+    {
+      "name": "Darwinia Crab",
+      "reason": "crab-rpc.darwinia.network DNS failure"
+    },
+    {
+      "name": "DeepBrain",
+      "reason": "info.dbcwallet.io SSL certificate mismatch"
+    },
+    {
+      "name": "Exosama",
+      "reason": "rpc.exosama.com 403 Forbidden"
     }
   ],
   "chain_ids": [
     "70255b4d28de0fc4e1a193d7e175ad1ccef431598211c55538f1018651a0344e",
     "f6c2c9174aa58c1c5b38d44a7e946c94a38cfd6e0ad9e2e9c5b14a7bc7ee6f44",
     "cd4d732201ebe5d6b014edda071c4203e16867305332f43c2e25ae6c9a1b7e6f",
-    "3d22af97d919611e03bbcbda96f65988758865423e89b2d99547a6bb61452db3"
+    "3d22af97d919611e03bbcbda96f65988758865423e89b2d99547a6bb61452db3",
+    "86e49c195aeae7c5c4a86ced251f1a28c67b3c35d8289c387ede1776cdd88b24",
+    "03aa6b475a03f8baf7f83e448513b00eaab03aefa4ed64bd1d31160dce028add",
+    "eip155:2109"
   ]
 }
diff --git a/scripts/merge-chains.py b/scripts/merge-chains.py
index 5eec371..8d6ada2 100755
--- a/scripts/merge-chains.py
+++ b/scripts/merge-chains.py
@@ -30,6 +30,8 @@ BROKEN_CHAIN_KEYWORDS = [
     'alephzero',
     'quartz',
     'invarch',
+    'exosama',
+    'deepbrain',
 ]
 
 # These chains have broken endpoints or are not useful
@@ -42,6 +44,12 @@ EXCLUDED_CHAIN_IDS = {
     '31a7d8914fb31c249b972f18c115f1e22b4b039abbcb03c73b6774c5642f9efe',
     # Aleph Zero EVM - PAUSED
     'eip155:41455',
+    # Darwinia Crab - DNS failure
+    '86e49c195aeae7c5c4a86ced251f1a28c67b3c35d8289c387ede1776cdd88b24',
+    # DeepBrain - SSL certificate mismatch
+    '03aa6b475a03f8baf7f83e448513b00eaab03aefa4ed64bd1d31160dce028add',
+    # Exosama - 403 Forbidden
+    'eip155:2109',
 }