diff --git a/defs/bitcoin/crown.json b/defs/bitcoin/crown.json
index 71c36b31f1..07cfbc2885 100644
--- a/defs/bitcoin/crown.json
+++ b/defs/bitcoin/crown.json
@@ -32,9 +32,7 @@
   "uri_prefix": "crown",
   "min_address_length": 27,
   "max_address_length": 34,
-  "bitcore": [
-    "https://crw-bitcore.crown.tech"
-  ],
+  "bitcore": [],
   "blockbook": [],
   "cooldown": 100
 }
diff --git a/defs/bitcoin/komodo.json b/defs/bitcoin/komodo.json
index 0846160884..b81d7fee65 100644
--- a/defs/bitcoin/komodo.json
+++ b/defs/bitcoin/komodo.json
@@ -32,10 +32,7 @@
   "uri_prefix": "komodo",
   "min_address_length": 27,
   "max_address_length": 34,
-  "bitcore": [
-    "https://www.kmdexplorer.io",
-    "https://kmdexplorer.ru"
-  ],
+  "bitcore": [],
   "blockbook": [],
   "cooldown": 100
 }
diff --git a/defs/bitcoin/nix.json b/defs/bitcoin/nix.json
index 28c1a18fae..e094ab2c16 100644
--- a/defs/bitcoin/nix.json
+++ b/defs/bitcoin/nix.json
@@ -32,10 +32,7 @@
   "uri_prefix": "nix",
   "min_address_length": 27,
   "max_address_length": 34,
-  "bitcore": [
-    "https://blockchain.nixplatform.io"
-  ],
-  "blockbook": [
-  ],
+  "bitcore": [],
+  "blockbook": [],
   "cooldown": 100
 }