From f133751cceeda138dd017fa4dbfd47c8964d5bd7 Mon Sep 17 00:00:00 2001
From: Manu NALEPA <enalepa@offchainlabs.com>
Date: Wed, 2 Jul 2025 11:36:31 +0200
Subject: [PATCH] `--chain-config-file`: Do not use any more mainnet boot
 nodes. (#15460)

---
 changelog/manu-bootnodes.md                    | 2 ++
 config/features/config.go                      | 7 ++++---
 config/params/BUILD.bazel                      | 1 +
 config/params/testnet_custom_network_config.go | 9 +++++++++
 4 files changed, 16 insertions(+), 3 deletions(-)
 create mode 100644 changelog/manu-bootnodes.md
 create mode 100644 config/params/testnet_custom_network_config.go

diff --git a/changelog/manu-bootnodes.md b/changelog/manu-bootnodes.md
new file mode 100644
index 0000000000..5e52d52d58
--- /dev/null
+++ b/changelog/manu-bootnodes.md
@@ -0,0 +1,2 @@
+### Fixed 
+- `--chain-config-file`: Do not use any more mainnet boot nodes.
diff --git a/config/features/config.go b/config/features/config.go
index 9fa377e071..1df69e0fce 100644
--- a/config/features/config.go
+++ b/config/features/config.go
@@ -156,7 +156,8 @@ func configureTestnet(ctx *cli.Context) error {
 		params.UseHoodiNetworkConfig()
 	} else {
 		if ctx.IsSet(cmd.ChainConfigFileFlag.Name) {
-			log.Warn("Running on custom Ethereum network specified in a chain configuration yaml file")
+			log.Warning("Running on custom Ethereum network specified in a chain configuration YAML file")
+			params.UseCustomNetworkConfig()
 		} else {
 			log.Info("Running on Ethereum Mainnet")
 		}
@@ -168,11 +169,11 @@ func configureTestnet(ctx *cli.Context) error {
 }
 
 // Insert feature flags within the function to be enabled for Sepolia testnet.
-func applySepoliaFeatureFlags(ctx *cli.Context) {
+func applySepoliaFeatureFlags(_ *cli.Context) {
 }
 
 // Insert feature flags within the function to be enabled for Holesky testnet.
-func applyHoleskyFeatureFlags(ctx *cli.Context) {
+func applyHoleskyFeatureFlags(_ *cli.Context) {
 }
 
 // ConfigureBeaconChain sets the global config based
diff --git a/config/params/BUILD.bazel b/config/params/BUILD.bazel
index d2d39e5fc7..1a29916c2f 100644
--- a/config/params/BUILD.bazel
+++ b/config/params/BUILD.bazel
@@ -14,6 +14,7 @@ go_library(
         "mainnet_config.go",
         "minimal_config.go",
         "network_config.go",
+        "testnet_custom_network_config.go",
         "testnet_e2e_config.go",
         "testnet_holesky_config.go",
         "testnet_hoodi_config.go",
diff --git a/config/params/testnet_custom_network_config.go b/config/params/testnet_custom_network_config.go
new file mode 100644
index 0000000000..7ce6780fd5
--- /dev/null
+++ b/config/params/testnet_custom_network_config.go
@@ -0,0 +1,9 @@
+package params
+
+func UseCustomNetworkConfig() {
+	cfg := BeaconNetworkConfig().Copy()
+	cfg.ContractDeploymentBlock = 0
+	cfg.BootstrapNodes = []string{}
+
+	OverrideBeaconNetworkConfig(cfg)
+}