diff --git a/Sources/FCL-SDK/AppUtilities/AppUtilities.swift b/Sources/FCL-SDK/AppUtilities/AppUtilities.swift
index 33a21bd..eb1efc2 100644
--- a/Sources/FCL-SDK/AppUtilities/AppUtilities.swift
+++ b/Sources/FCL-SDK/AppUtilities/AppUtilities.swift
@@ -14,7 +14,7 @@ public enum AppUtilities {
 
     public static func verifyAccountProof(
         appIdentifier: String,
-        accountProofData: AccountProofSignatureData,
+        accountProofData: AccountProofVerifiable,
         fclCryptoContract: Address?
     ) async throws -> Bool {
         let verifyMessage = WalletUtilities.encodeAccountProof(
@@ -54,7 +54,7 @@ public enum AppUtilities {
 
     public static func verifyUserSignatures(
         message: String,
-        signatures: [FCLCompositeSignature],
+        signatures: [CompositeSignatureVerifiable],
         fclCryptoContract: Address?
     ) async throws -> Bool {
 
diff --git a/Sources/FCL-SDK/Models/AccountProofData.swift b/Sources/FCL-SDK/Models/AccountProofData.swift
index 6cff8dd..29cf56b 100644
--- a/Sources/FCL-SDK/Models/AccountProofData.swift
+++ b/Sources/FCL-SDK/Models/AccountProofData.swift
@@ -21,11 +21,17 @@ public struct FCLAccountProofData {
 
 }
 
-public struct AccountProofSignatureData {
+public protocol AccountProofVerifiable {
+    var address: Address { get }
+    var nonce: String { get }
+    var signatures: [CompositeSignatureVerifiable] { get }
+}
+
+public struct AccountProofSignatureData: AccountProofVerifiable {
 
-    let address: Address
-    let nonce: String
-    let signatures: [FCLCompositeSignature]
+    public let address: Address
+    public let nonce: String
+    public let signatures: [CompositeSignatureVerifiable]
 
     public init(
         address: Address,
diff --git a/Sources/FCL-SDK/Models/FCLCompositeSignature.swift b/Sources/FCL-SDK/Models/FCLCompositeSignature.swift
index 5a64192..28452b6 100644
--- a/Sources/FCL-SDK/Models/FCLCompositeSignature.swift
+++ b/Sources/FCL-SDK/Models/FCLCompositeSignature.swift
@@ -7,7 +7,13 @@
 
 import Foundation
 
-public struct FCLCompositeSignature: Decodable {
+public protocol CompositeSignatureVerifiable {
+    var address: String { get }
+    var keyId: Int { get }
+    var signature: String { get }
+}
+
+public struct FCLCompositeSignature: CompositeSignatureVerifiable, Decodable {
 
     public let fclType: String
     public let fclVersion: String