diff --git a/justfile b/justfile
index 6ca869e..68988da 100644
--- a/justfile
+++ b/justfile
@@ -1,9 +1,32 @@
+default: check test
+
+# Development
+
 check:
   cargo clippy
 
+test:
+  cargo test
+
 run-localnode profile="--alice":
   cargo xtask run local {{profile}}
 
+# Specs
+
+base_spec_path := "node/specs/base.json"
+
+gen-base-spec:
+  cargo run -p torus-node -- build-spec --chain dev > "{{base_spec_path}}"
+
+gen-spec-file env: gen-base-spec
+  mkdir -p tmp/spec
+  scripts/adjust-spec-file.py "{{env}}" "{{base_spec_path}}" \
+    --balances-file data/torus-genesis-balances.json \
+    --merge-balances \
+    > tmp/spec/{{env}}.json
+
+# Github Actions
+
 run-workflows:
   act --secret-file .env \
     -P 'ubuntu-24.04-8core-bakunin=ghcr.io/catthehacker/act-ubuntu:24.04' \
diff --git a/scripts/adjust-spec-file.py b/scripts/adjust-spec-file.py
new file mode 100755
index 0000000..551763f
--- /dev/null
+++ b/scripts/adjust-spec-file.py
@@ -0,0 +1,80 @@
+#!/usr/bin/env python3
+
+import argparse
+import json
+
+ALICE = "5GrwvaEF5zXb26Fz9rcQpDWS57CtERHpNehXCPcNoHGKutQY"
+
+parser = argparse.ArgumentParser(
+    description='Adjust chain spec file with node configuration')
+parser.add_argument(
+    'node_env', help='Node environment (e.g. mainnet, testnet)', type=str)
+parser.add_argument(
+    'spec_file', help='Path to the input chain spec file', type=str)
+parser.add_argument(
+    "--aura-list-file", help="Path to the aura list file (JSON)", type=str)
+parser.add_argument(
+    "--gran-list-file", help="Path to the gran list file (JSON)", type=str)
+parser.add_argument(
+    "--balances-file", help="Path to the balances file (JSON)", type=str)
+parser.add_argument(
+    "--merge-balances", help="Merge external balances with the spec file balances", action="store_true")
+parser.add_argument(
+    "--sudo-key", help="Sudo key to use", type=str)
+
+args = parser.parse_args()
+
+node_env = args.node_env
+base_spec_file = args.spec_file
+aura_list_path = args.aura_list_file
+gran_list_path = args.gran_list_file
+
+
+def load_json(path: str):
+    with open(path, 'r') as f:
+        return json.load(f)
+
+
+spec_data = load_json(base_spec_file)
+
+if node_env == "mainnet":
+    spec_data['chainType'] = "Live"
+    spec_data['id'] = "torus"
+else:
+    spec_data['chainType'] = "Development"
+    spec_data['id'] = f"torus-{node_env}"
+
+patch_obj = spec_data['genesis']['runtimeGenesis']['patch']
+
+if aura_list_path:
+    # Inject AURA authority pub key list
+    aura_list = load_json(aura_list_path)
+    patch_obj['aura']['authorities'] = aura_list
+
+if gran_list_path:
+    # Inject GRANDPA authority pub key list
+    gran_list = load_json(gran_list_path)
+    patch_obj['grandpa']['authorities'] = gran_list
+
+# Check sudo key is correct
+spec_sudo_key = patch_obj['sudo']['key']
+if args.sudo_key:
+    patch_obj['sudo']['key'] = args.sudo_key
+elif node_env != "mainnet":
+    assert spec_sudo_key == ALICE
+
+# # Inject EVM chain id
+# patch_obj['evmChainId']['chainId'] = 69420
+
+if args.balances_file:
+    balances = load_json(args.balances_file)
+    if args.merge_balances:
+        if node_env == "mainnet":
+            raise RuntimeError("Cannot merge balances on mainnet")
+        patch_obj['balances']['balances'] += balances
+    else:
+        patch_obj['balances']['balances'] = balances
+
+
+json_txt = json.dumps(spec_data, indent=2)
+print(json_txt)