diff --git a/glyph/src/types.rs b/glyph/src/types.rs
index 0b4a2ec..2370176 100644
--- a/glyph/src/types.rs
+++ b/glyph/src/types.rs
@@ -1,5 +1,6 @@
-use anyhow::Result;
+use anyhow::{anyhow, Result};
 use serde::{Deserialize, Serialize};
+use std::default::Default;
 use std::str::FromStr;
 
 #[derive(Serialize, Deserialize, Debug, Clone, PartialEq)]
@@ -104,3 +105,31 @@ pub struct WifiParams {
     pub ssid: String,
     pub password: String,
 }
+
+#[derive(Serialize, Deserialize, Debug, Clone, Copy, PartialEq)]
+pub enum SignerType {
+    ReceiveOnly,
+    ReceiveSend,
+}
+
+impl SignerType {
+    pub fn to_byte(&self) -> u8 {
+        match self {
+            SignerType::ReceiveOnly => 0x5a,
+            SignerType::ReceiveSend => 0x8c,
+        }
+    }
+    pub fn from_byte(b: u8) -> Result<Self> {
+        match b {
+            0x5a => Ok(SignerType::ReceiveOnly),
+            0x8c => Ok(SignerType::ReceiveSend),
+            _ => Err(anyhow!("SignerType byte incorrect: {:x}", b)),
+        }
+    }
+}
+
+impl Default for SignerType {
+    fn default() -> Self {
+        SignerType::ReceiveSend
+    }
+}