diff --git a/ExampleApp/ExampleApp.xcodeproj/project.pbxproj b/ExampleApp/ExampleApp.xcodeproj/project.pbxproj
index da6d0e9..d45a648 100644
--- a/ExampleApp/ExampleApp.xcodeproj/project.pbxproj
+++ b/ExampleApp/ExampleApp.xcodeproj/project.pbxproj
@@ -282,7 +282,7 @@
 				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
 				CODE_SIGN_ENTITLEMENTS = ExampleApp/ExampleApp.entitlements;
 				CODE_SIGN_STYLE = Automatic;
-				CURRENT_PROJECT_VERSION = 2;
+				CURRENT_PROJECT_VERSION = 3;
 				DEVELOPMENT_TEAM = CMQ8K8AVJB;
 				ENABLE_PREVIEWS = YES;
 				GENERATE_INFOPLIST_FILE = YES;
@@ -299,7 +299,7 @@
 					"$(inherited)",
 					"@executable_path/Frameworks",
 				);
-				MARKETING_VERSION = 1.0;
+				MARKETING_VERSION = 1.1;
 				PRODUCT_BUNDLE_IDENTIFIER = io.signedshot.capture;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SUPPORTED_PLATFORMS = "iphoneos iphonesimulator";
@@ -319,7 +319,7 @@
 				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
 				CODE_SIGN_ENTITLEMENTS = ExampleApp/ExampleApp.entitlements;
 				CODE_SIGN_STYLE = Automatic;
-				CURRENT_PROJECT_VERSION = 2;
+				CURRENT_PROJECT_VERSION = 3;
 				DEVELOPMENT_TEAM = CMQ8K8AVJB;
 				ENABLE_PREVIEWS = YES;
 				GENERATE_INFOPLIST_FILE = YES;
@@ -336,7 +336,7 @@
 					"$(inherited)",
 					"@executable_path/Frameworks",
 				);
-				MARKETING_VERSION = 1.0;
+				MARKETING_VERSION = 1.1;
 				PRODUCT_BUNDLE_IDENTIFIER = io.signedshot.capture;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SUPPORTED_PLATFORMS = "iphoneos iphonesimulator";
diff --git a/ExampleApp/ExampleApp/ContentView.swift b/ExampleApp/ExampleApp/ContentView.swift
index bd9d135..cde9a91 100644
--- a/ExampleApp/ExampleApp/ContentView.swift
+++ b/ExampleApp/ExampleApp/ContentView.swift
@@ -66,7 +66,7 @@ struct ContentView: View {
             publisherId: "8f6b5d94-af3b-4f57-be68-e93eedd772fc"
         )!
         #endif
-        client = SignedShotClient(configuration: config)
+        client = SignedShotClient(configuration: config, enclaveService: enclaveService)
         integrityService = MediaIntegrityService(enclaveService: enclaveService)
     }
 
diff --git a/Sources/SignedShotSDK/APIModels.swift b/Sources/SignedShotSDK/APIModels.swift
index 8babef7..2cea810 100644
--- a/Sources/SignedShotSDK/APIModels.swift
+++ b/Sources/SignedShotSDK/APIModels.swift
@@ -7,12 +7,18 @@ public struct DeviceCreateRequest: Codable, Sendable {
     /// Unique identifier for the device (e.g., hardware ID, app installation ID)
     public let externalId: String
 
-    public init(externalId: String) {
+    /// Base64-encoded uncompressed EC public key (65 bytes: 0x04 + X + Y)
+    /// from the device's content-signing key pair (Secure Enclave)
+    public let publicKey: String
+
+    public init(externalId: String, publicKey: String) {
         self.externalId = externalId
+        self.publicKey = publicKey
     }
 
     private enum CodingKeys: String, CodingKey {
         case externalId = "external_id"
+        case publicKey = "public_key"
     }
 }
 
diff --git a/Sources/SignedShotSDK/SignedShotClient.swift b/Sources/SignedShotSDK/SignedShotClient.swift
index 3472ab9..8a52b9e 100644
--- a/Sources/SignedShotSDK/SignedShotClient.swift
+++ b/Sources/SignedShotSDK/SignedShotClient.swift
@@ -38,6 +38,7 @@ public actor SignedShotClient {
     private let configuration: SignedShotConfiguration
     private let session: URLSession
     private let keychain: KeychainStorage
+    private let enclaveService: SecureEnclaveService
     private let decoder: JSONDecoder
     private let encoder: JSONEncoder
 
@@ -52,9 +53,15 @@ public actor SignedShotClient {
     /// - Parameters:
     ///   - configuration: Client configuration
     ///   - keychain: Keychain storage (defaults to standard)
-    public init(configuration: SignedShotConfiguration, keychain: KeychainStorage = KeychainStorage()) {
+    ///   - enclaveService: Secure Enclave service for key management (defaults to standard)
+    public init(
+        configuration: SignedShotConfiguration,
+        keychain: KeychainStorage = KeychainStorage(),
+        enclaveService: SecureEnclaveService = SecureEnclaveService()
+    ) {
         self.configuration = configuration
         self.keychain = keychain
+        self.enclaveService = enclaveService
         self.session = URLSession.shared
 
         self.decoder = JSONDecoder()
@@ -116,13 +123,10 @@ public actor SignedShotClient {
         return newId
     }
 
-    private func performRegistration(
+    private func buildRegistrationRequest(
         externalId: String,
-        attestationToken: String? = nil,
-        isRetry: Bool
-    ) async throws -> DeviceCreateResponse {
-        SignedShotLogger.api.info("Registering device with externalId: \(externalId.prefix(8))...")
-
+        attestationToken: String?
+    ) throws -> URLRequest {
         let url = configuration.baseURL.appendingPathComponent("devices")
         SignedShotLogger.api.debug("POST \(url.absoluteString)")
 
@@ -131,14 +135,25 @@ public actor SignedShotClient {
         request.setValue("application/json", forHTTPHeaderField: "Content-Type")
         request.setValue(configuration.publisherId, forHTTPHeaderField: "X-Publisher-ID")
 
-        // Add attestation token header if provided
         if let token = attestationToken {
             request.setValue(token, forHTTPHeaderField: "X-Attestation-Token")
             SignedShotLogger.api.debug("Including attestation token in request")
         }
 
-        let body = DeviceCreateRequest(externalId: externalId)
+        let publicKeyBase64 = try enclaveService.getPublicKeyBase64()
+        let body = DeviceCreateRequest(externalId: externalId, publicKey: publicKeyBase64)
         request.httpBody = try encoder.encode(body)
+        return request
+    }
+
+    private func performRegistration(
+        externalId: String,
+        attestationToken: String? = nil,
+        isRetry: Bool
+    ) async throws -> DeviceCreateResponse {
+        SignedShotLogger.api.info("Registering device with externalId: \(externalId.prefix(8))...")
+
+        let request = try buildRegistrationRequest(externalId: externalId, attestationToken: attestationToken)
 
         let (data, response) = try await performRequest(request)
 
diff --git a/Tests/SignedShotSDKTests/APIModelsTests.swift b/Tests/SignedShotSDKTests/APIModelsTests.swift
index 39e5ebb..21b035e 100644
--- a/Tests/SignedShotSDKTests/APIModelsTests.swift
+++ b/Tests/SignedShotSDKTests/APIModelsTests.swift
@@ -6,24 +6,26 @@ final class APIModelsTests: XCTestCase {
     // MARK: - DeviceCreateRequest Tests
 
     func testDeviceCreateRequestEncoding() throws {
-        let request = DeviceCreateRequest(externalId: "test-device-123")
+        let request = DeviceCreateRequest(externalId: "test-device-123", publicKey: "dGVzdHB1YmxpY2tleQ==")
 
         let encoder = JSONEncoder()
         let data = try encoder.encode(request)
         let json = try JSONSerialization.jsonObject(with: data) as? [String: Any]
 
         XCTAssertEqual(json?["external_id"] as? String, "test-device-123")
+        XCTAssertEqual(json?["public_key"] as? String, "dGVzdHB1YmxpY2tleQ==")
     }
 
     func testDeviceCreateRequestDecoding() throws {
         let json = """
-        {"external_id": "my-device-id"}
+        {"external_id": "my-device-id", "public_key": "dGVzdHB1YmxpY2tleQ=="}
         """
 
         let decoder = JSONDecoder()
         let request = try decoder.decode(DeviceCreateRequest.self, from: json.data(using: .utf8)!)
 
         XCTAssertEqual(request.externalId, "my-device-id")
+        XCTAssertEqual(request.publicKey, "dGVzdHB1YmxpY2tleQ==")
     }
 
     // MARK: - DeviceCreateResponse Tests