diff --git a/SecretAgent/AppDelegate.swift b/SecretAgent/AppDelegate.swift
index 5421581..1791fa9 100644
--- a/SecretAgent/AppDelegate.swift
+++ b/SecretAgent/AppDelegate.swift
@@ -5,7 +5,7 @@ import OSLog
 @NSApplicationMain
 class AppDelegate: NSObject, NSApplicationDelegate {
 
-    let store = SecureEnclave.Store()
+    let store = SmartCard.Store()
     let notifier = Notifier()
     lazy var agent: Agent = {
         Agent(store: store, notifier: notifier)
diff --git a/SecretAgent/SecretAgent.entitlements b/SecretAgent/SecretAgent.entitlements
index 7f8f6ca..6d010b7 100644
--- a/SecretAgent/SecretAgent.entitlements
+++ b/SecretAgent/SecretAgent.entitlements
@@ -4,6 +4,10 @@
 <dict>
 	<key>com.apple.security.app-sandbox</key>
 	<true/>
+	<key>com.apple.security.temporary-exception.mach-lookup.global-name</key>
+	<array>
+		<string>com.apple.ctkd.watcher-client</string>
+	</array>
 	<key>keychain-access-groups</key>
 	<array>
 		<string>$(AppIdentifierPrefix)com.maxgoedjen.Secretive</string>
diff --git a/SecretKit/SmartCard/SmartCardStore.swift b/SecretKit/SmartCard/SmartCardStore.swift
index da243c6..c5e7f02 100644
--- a/SecretKit/SmartCard/SmartCardStore.swift
+++ b/SecretKit/SmartCard/SmartCardStore.swift
@@ -2,6 +2,8 @@ import Foundation
 import Security
 import CryptoTokenKit
 
+// TODO: Might need to split this up into "sub-stores?"
+// ie, each token has its own Store.
 extension SmartCard {
 
     public class Store: SecretStore {
@@ -10,20 +12,102 @@ extension SmartCard {
         public let name = NSLocalizedString("Smart Card", comment: "Smart Card")
         @Published public fileprivate(set) var secrets: [Secret] = []
         fileprivate let watcher = TKTokenWatcher()
+        fileprivate var id: String?
 
         public init() {
-            watcher.setInsertionHandler { (string) in
-                print(string)
+            id = watcher.tokenIDs.filter { !$0.contains("setoken") }.first
+            watcher.setInsertionHandler { string in
+                guard self.id == nil else { return }
+                guard !string.contains("setoken") else { return }
+                self.id = string
+                self.secrets.removeAll()
+                self.loadSecrets()
             }
-            print(watcher.tokenIDs)
+            loadSecrets()
         }
 
-        public func sign(data: Data, with secret: SmartCard.Secret) throws -> Data {
-            fatalError()
+        // MARK: Public API
+
+        public func create(name: String) throws {
+            fatalError("Keys must be created on the smart card.")
         }
 
-        public func delete(secret: SmartCard.Secret) throws {
+        public func delete(secret: Secret) throws {
+            fatalError("Keys must be deleted on the smart card.")
+        }
+
+        public func sign(data: Data, with secret: SecretType) throws -> Data {
+            guard let id = id else { fatalError() }
+            let attributes = [
+                kSecClass: kSecClassKey,
+                kSecAttrKeyClass: kSecAttrKeyClassPrivate,
+                kSecAttrApplicationLabel: secret.id as CFData,
+                kSecAttrTokenID: id,
+                kSecReturnRef: true
+                ] as CFDictionary
+            var untyped: CFTypeRef?
+            let status = SecItemCopyMatching(attributes, &untyped)
+            if status != errSecSuccess {
+                throw KeychainError(statusCode: status)
+            }
+            guard let untypedSafe = untyped else {
+                throw KeychainError(statusCode: errSecSuccess)
+            }
+            let key = untypedSafe as! SecKey
+            var signError: SecurityError?
+            guard let signature = SecKeyCreateSignature(key, .ecdsaSignatureMessageX962SHA256, data as CFData, &signError) else {
+                throw SigningError(error: signError)
+            }
+            return signature as Data
         }
 
     }
+
+}
+
+extension SmartCard.Store {
+
+    fileprivate func loadSecrets() {
+        guard let id = id else { return }
+        let attributes = [
+            kSecClass: kSecClassKey,
+            kSecAttrTokenID: id,
+            kSecReturnRef: true,
+            kSecMatchLimit: kSecMatchLimitAll,
+            kSecReturnAttributes: true
+            ] as CFDictionary
+        var untyped: CFTypeRef?
+        let status = SecItemCopyMatching(attributes, &untyped)
+        print(status)
+        guard let typed = untyped as? [[CFString: Any]] else { return }
+        let wrapped: [SmartCard.Secret] = typed.map {
+            let name = $0[kSecAttrLabel] as? String ?? "Unnamed"
+            let id = $0[kSecAttrApplicationLabel] as! Data
+            let publicKeyRef = $0[kSecValueRef] as! SecKey
+            let publicKeySecRef = SecKeyCopyPublicKey(publicKeyRef)!
+            let publicKeyAttributes = SecKeyCopyAttributes(publicKeySecRef) as! [CFString: Any]
+            let publicKey = publicKeyAttributes[kSecValueData] as! Data
+            return SmartCard.Secret(id: id, name: name, publicKey: publicKey)
+        }
+        secrets.append(contentsOf: wrapped)
+    }
+
+}
+
+extension SmartCard {
+
+    public struct KeychainError: Error {
+        public let statusCode: OSStatus
+    }
+
+    public struct SigningError: Error {
+        public let error: SecurityError?
+    }
+
+}
+
+extension SmartCard {
+
+    public typealias SecurityError = Unmanaged<CFError>
+
 }
diff --git a/Secretive/AppDelegate.swift b/Secretive/AppDelegate.swift
index ee03f86..420f4ae 100644
--- a/Secretive/AppDelegate.swift
+++ b/Secretive/AppDelegate.swift
@@ -12,7 +12,7 @@ class AppDelegate: NSObject, NSApplicationDelegate {
 
     func applicationDidFinishLaunching(_ aNotification: Notification) {
 
-        let contentView = ContentView(store: secureEnclave)
+        let contentView = ContentView(store: yubikey)
         // Create the window and set the content view.
         window = NSWindow(
             contentRect: NSRect(x: 0, y: 0, width: 480, height: 300),
diff --git a/Secretive/Secretive.entitlements b/Secretive/Secretive.entitlements
index 7f8f6ca..6d010b7 100644
--- a/Secretive/Secretive.entitlements
+++ b/Secretive/Secretive.entitlements
@@ -4,6 +4,10 @@
 <dict>
 	<key>com.apple.security.app-sandbox</key>
 	<true/>
+	<key>com.apple.security.temporary-exception.mach-lookup.global-name</key>
+	<array>
+		<string>com.apple.ctkd.watcher-client</string>
+	</array>
 	<key>keychain-access-groups</key>
 	<array>
 		<string>$(AppIdentifierPrefix)com.maxgoedjen.Secretive</string>