From 2967b24d2d1fb6067edfcc5cafcf859a220d6153 Mon Sep 17 00:00:00 2001
From: Nathan Iheanyi <Niheanyi404@gmail.com>
Date: Sat, 28 Mar 2026 21:40:24 +0100
Subject: [PATCH] feat: implement Network::passphrase() for Stellar network
 passphrases

---
 crates/core/src/network/config.rs |  2 +-
 crates/core/src/types/config.rs   | 58 +++++++++++++++++++++++++++++++
 2 files changed, 59 insertions(+), 1 deletion(-)

diff --git a/crates/core/src/network/config.rs b/crates/core/src/network/config.rs
index 1203fc4e..e644cfc2 100644
--- a/crates/core/src/network/config.rs
+++ b/crates/core/src/network/config.rs
@@ -3,7 +3,7 @@
 //! Manages RPC endpoints, archive URLs, network passphrases for
 //! mainnet/testnet/futurenet/standalone networks.
 
-use crate::types::config::{Network, NetworkConfig};
+use crate::types::config::NetworkConfig;
 
 /// Resolve a network name string to a `NetworkConfig`.
 ///
diff --git a/crates/core/src/types/config.rs b/crates/core/src/types/config.rs
index 08635185..ae9a2b12 100644
--- a/crates/core/src/types/config.rs
+++ b/crates/core/src/types/config.rs
@@ -19,6 +19,64 @@ impl Default for Network {
     }
 }
 
+impl Network {
+    /// Return the canonical network passphrase for this network.
+    ///
+    /// These strings are used when signing and verifying Stellar transactions —
+    /// they must match exactly what the network nodes expect.
+    pub fn passphrase(&self) -> &'static str {
+        match self {
+            Self::Mainnet => "Public Global Stellar Network ; September 2015",
+            Self::Testnet => "Test SDF Network ; September 2015",
+            Self::Futurenet => "Test SDF Future Network ; October 2022",
+            Self::Standalone => "Standalone Network ; February 2017",
+            Self::Custom => "",
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn passphrase_mainnet() {
+        assert_eq!(
+            Network::Mainnet.passphrase(),
+            "Public Global Stellar Network ; September 2015"
+        );
+    }
+
+    #[test]
+    fn passphrase_testnet() {
+        assert_eq!(
+            Network::Testnet.passphrase(),
+            "Test SDF Network ; September 2015"
+        );
+    }
+
+    #[test]
+    fn passphrase_futurenet() {
+        assert_eq!(
+            Network::Futurenet.passphrase(),
+            "Test SDF Future Network ; October 2022"
+        );
+    }
+
+    #[test]
+    fn passphrase_standalone() {
+        assert_eq!(
+            Network::Standalone.passphrase(),
+            "Standalone Network ; February 2017"
+        );
+    }
+
+    #[test]
+    fn passphrase_custom_is_empty() {
+        assert_eq!(Network::Custom.passphrase(), "");
+    }
+}
+
 /// Configuration for connecting to a Stellar network.
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct NetworkConfig {