Use ed25519 by default for network keys (#2290)

substrate/core/cli/src/params.rs

@@ -189,7 +189,7 @@ pub struct NodeKeyParams {
 		raw(
 			possible_values = "&NodeKeyType::variants()",
 			case_insensitive = "true",
-			default_value = r#""Secp256k1""#
+			default_value = r#""Ed25519""#
 		)
 	)]
 	pub node_key_type: NodeKeyType,

substrate/core/network-libp2p/src/config.rs

@@ -61,7 +61,7 @@ impl Default for NetworkConfiguration {
 			listen_addresses: Vec::new(),
 			public_addresses: Vec::new(),
 			boot_nodes: Vec::new(),
-			node_key: NodeKeyConfig::Secp256k1(Secret::New),
+			node_key: NodeKeyConfig::Ed25519(Secret::New),
 			in_peers: 25,
 			out_peers: 75,
 			reserved_nodes: Vec::new(),