diff --git a/src/key_binding_jwt_claims.rs b/src/key_binding_jwt_claims.rs
index e83acda..e8dcdf5 100644
--- a/src/key_binding_jwt_claims.rs
+++ b/src/key_binding_jwt_claims.rs
@@ -24,6 +24,8 @@ pub struct KeyBindingJwtClaims {
 }
 
 impl KeyBindingJwtClaims {
+  pub const KB_JWT_HEADER_TYP: &'static str = " kb+jwt";
+
   /// Creates a new [`KeyBindingJwtClaims`].
   /// When `issued_at` is left as None, it will automatically default to the current time
   ///
diff --git a/src/sd_jwt.rs b/src/sd_jwt.rs
index f17ad50..a0682ec 100644
--- a/src/sd_jwt.rs
+++ b/src/sd_jwt.rs
@@ -6,10 +6,12 @@ use std::fmt::Display;
 use crate::Error;
 use crate::Result;
 use itertools::Itertools;
+use serde::Deserialize;
+use serde::Serialize;
 
 /// Representation of an SD-JWT of the format
 /// `<Issuer-signed JWT>~<Disclosure 1>~<Disclosure 2>~...~<Disclosure N>~<optional KB-JWT>`.
-#[derive(Debug, Clone, Eq, PartialEq)]
+#[derive(Debug, Clone, Eq, PartialEq, Serialize, Deserialize)]
 pub struct SdJwt {
   /// The JWT part.
   pub jwt: String,