diff --git a/src/lib.rs b/src/lib.rs
index 8aae093..326d983 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,4 +1,5 @@
 use std::fmt::Debug;
+use std::str::FromStr;
 use std::sync::{Mutex, MutexGuard};
 
 pub use aes_gcm;
@@ -22,6 +23,31 @@ pub mod silentpayments;
 
 pub const MAX_PRD_PAYLOAD_SIZE: usize = u16::MAX as usize; // 64KiB sounds reasonable for now
 
+#[derive(Debug, PartialEq, Eq)]
+pub enum SpecialRoles {
+    DEMIURGE,
+}
+
+impl std::fmt::Display for SpecialRoles {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        let role_str = match self {
+            SpecialRoles::DEMIURGE => "demiurge",
+        };
+        write!(f, "{}", role_str)
+    }
+}
+
+impl FromStr for SpecialRoles {
+    type Err = String;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        match s {
+            "demiurge" => Ok(SpecialRoles::DEMIURGE),
+            _ => Err(format!("Invalid role: {}", s)),
+        }
+    }
+}
+
 pub trait MutexExt<T> {
     fn lock_anyhow(&self) -> Result<MutexGuard<T>, anyhow::Error>;
 }