diff --git a/src/pcd.rs b/src/pcd.rs
index 1cc64fa..ff93483 100644
--- a/src/pcd.rs
+++ b/src/pcd.rs
@@ -6,7 +6,7 @@ use log::debug;
 use rand::thread_rng;
 use serde::{Deserialize, Serialize};
 use serde_json::{Map, Value};
-use sp_client::{bitcoin::{hashes::{sha256t_hash_newtype, Hash, HashEngine}, hex::{DisplayHex, FromHex}, Txid}, silentpayments::utils::SilentPaymentAddress};
+use sp_client::{bitcoin::{hashes::{sha256t_hash_newtype, Hash, HashEngine}, hex::{DisplayHex, FromHex}, XOnlyPublicKey}, silentpayments::utils::SilentPaymentAddress};
 use tsify::Tsify;
 
 use crate::crypto::AAD;
@@ -44,6 +44,13 @@ impl Member {
     pub fn get_addresses(&self) -> Vec<String> {
         self.sp_addresses.clone()
     }
+
+    pub fn key_is_part_of_member(&self, key: &XOnlyPublicKey) -> bool {
+        self.sp_addresses.iter().any(|a| {
+            let addr = SilentPaymentAddress::try_from(a.as_str()).unwrap();
+            addr.get_spend_key().x_only_public_key().0 == *key
+        })
+    }
 }
 
 sha256t_hash_newtype! {