diff --git a/SecretAgentKitTests/StubStore.swift b/SecretAgentKitTests/StubStore.swift
index 7f4fb38..42db26a 100644
--- a/SecretAgentKitTests/StubStore.swift
+++ b/SecretAgentKitTests/StubStore.swift
@@ -48,7 +48,7 @@ extension Stub {
             print("Public Key OpenSSH: \(OpenSSHKeyWriter().openSSHString(secret: secret))")
         }
 
-        public func sign(data: Data, with secret: Secret, for provenance: SigningRequestProvenance) throws -> Data {
+        public func sign(data: Data, with secret: Secret, for provenance: SigningRequestProvenance) throws -> SignedData {
             guard !shouldThrow else {
                 throw NSError(domain: "test", code: 0, userInfo: nil)
             }
@@ -67,7 +67,10 @@ extension Stub {
             default:
                 fatalError()
             }
-            return SecKeyCreateSignature(privateKey, signatureAlgorithm, data as CFData, nil)! as Data
+            return SignedData(data: SecKeyCreateSignature(privateKey, signatureAlgorithm, data as CFData, nil)! as Data, requiredAuthentication: false)
+        }
+
+        public func persistAuthentication(secret: Stub.Secret, forDuration duration: TimeInterval) throws {
         }
 
     }
diff --git a/SecretAgentKitTests/StubWitness.swift b/SecretAgentKitTests/StubWitness.swift
index 230c009..965ce5f 100644
--- a/SecretAgentKitTests/StubWitness.swift
+++ b/SecretAgentKitTests/StubWitness.swift
@@ -10,14 +10,14 @@ struct StubWitness {
 
 extension StubWitness: SigningWitness {
 
-    func speakNowOrForeverHoldYourPeace(forAccessTo secret: AnySecret, by provenance: SigningRequestProvenance) throws {
+func speakNowOrForeverHoldYourPeace(forAccessTo secret: AnySecret, from store: AnySecretStore, by provenance: SigningRequestProvenance) throws {
         let objection = speakNow(secret, provenance)
         if objection {
             throw TheresMyChance()
         }
     }
 
-    func witness(accessTo secret: AnySecret, by provenance: SigningRequestProvenance) throws {
+func witness(accessTo secret: AnySecret, from store: AnySecretStore, by provenance: SigningRequestProvenance, requiredAuthentication: Bool) throws {
         witness(secret, provenance)
     }
 
diff --git a/SecretKit/Common/Types/SignedData.swift b/SecretKit/Common/Types/SignedData.swift
index 14b529c..bcaf171 100644
--- a/SecretKit/Common/Types/SignedData.swift
+++ b/SecretKit/Common/Types/SignedData.swift
@@ -1,6 +1,13 @@
 import Foundation
 
 public struct SignedData {
+
     public let data: Data
     public let requiredAuthentication: Bool
+
+    public init(data: Data, requiredAuthentication: Bool) {
+        self.data = data
+        self.requiredAuthentication = requiredAuthentication
+    }
+
 }
diff --git a/Secretive/Preview Content/PreviewStore.swift b/Secretive/Preview Content/PreviewStore.swift
index dc5e6cb..4d4fbdb 100644
--- a/Secretive/Preview Content/PreviewStore.swift	
+++ b/Secretive/Preview Content/PreviewStore.swift	
@@ -35,8 +35,11 @@ extension Preview {
             self.secrets.append(contentsOf: new)
         }
 
-        func sign(data: Data, with secret: Preview.Secret, for provenance: SigningRequestProvenance) throws -> Data {
-            return data
+        func sign(data: Data, with secret: Preview.Secret, for provenance: SigningRequestProvenance) throws -> SignedData {
+            return SignedData(data: data, requiredAuthentication: false)
+        }
+
+        func persistAuthentication(secret: Preview.Secret, forDuration duration: TimeInterval) throws {
         }
 
     }