diff --git a/chains/chains_mainnet.json b/chains/chains_mainnet.json
index b1e91128..41b876a2 100644
--- a/chains/chains_mainnet.json
+++ b/chains/chains_mainnet.json
@@ -1,22 +1,22 @@
 [
     {
         "id": "0001",
-        "url": "https://bsc-1.stakesquid-db.ml/pokt"
+        "url": "https://${DOMAIN}/pokt"
     },
     {
         "id": "0026",
-        "url": "https://bsc-1.stakesquid-db.ml/goerli"
+        "url": "https://${DOMAIN}/goerli"
     },
     {
         "id": "0025",
-        "url": "https://bsc-1.stakesquid-db.ml/rinkeby"
+        "url": "https://${DOMAIN}/rinkeby"
     },
     {
         "id": "0023",
-        "url": "https://bsc-1.stakesquid-db.ml/ropsten"
+        "url": "https://${DOMAIN}/ropsten"
     },
     {
         "id": "0021",
-        "url": "https://bsc-1.stakesquid-db.ml/geth"
+        "url": "https://${DOMAIN}/geth"
     }
 ]
\ No newline at end of file
diff --git a/chains/chains_testnet.json b/chains/chains_testnet.json
index 281da43c..6d1546f8 100644
--- a/chains/chains_testnet.json
+++ b/chains/chains_testnet.json
@@ -1,18 +1,18 @@
 [
     {
         "id": "0020",
-        "url": "https://bsc-1.stakesquid-db.ml/goerli"
+        "url": "https://${DOMAIN}/goerli"
     },
     {
         "id": "0022",
-        "url": "https://bsc-1.stakesquid-db.ml/rinkeby"
+        "url": "https://${DOMAIN}/rinkeby"
     },
     {
         "id": "0023",
-        "url": "https://bsc-1.stakesquid-db.ml/ropsten"
+        "url": "https://${DOMAIN}/ropsten"
     },
     {
         "id": "0002",
-        "url": "https://bsc-1.stakesquid-db.ml/pokttest"
+        "url": "https://${DOMAIN}/pokttest"
     }
 ]
\ No newline at end of file
diff --git a/util/prepare.sh b/util/prepare.sh
new file mode 100644
index 00000000..6ccf812c
--- /dev/null
+++ b/util/prepare.sh
@@ -0,0 +1,6 @@
+#!/bin/sh
+
+source ../.env
+envsubst < ../chains/chains_mainnet.json > ../chains/chains_mainnet.json
+envsubst < ../chains/chains_testnet.json > ../chains/chains_testnet.json
+chown -R 1005:1001 ../chains ../bootstrap_skript