CrossmintDeviceWalletSigner - Crossmint Docs

Final Class Hardware-backed approval signer — keys live in Secure Enclave (iOS) or Android Keystore, never in Dart memory.

final class CrossmintDeviceWalletSigner implements CrossmintWalletApprovalSigner

Device signers are the SDK’s default delegated signer: low-friction, used for day-to-day transaction approvals. They are supported on EVM and Stellar wallets. On Solana, device signer support depends on the wallet type and is validated server-side. The locator must follow the device:<publicKeyBase64> format. Use CrossmintWalletsClient.createDeviceSigner to register a new device signer and get a valid locator.

Constructors

CrossmintDeviceWalletSigner

CrossmintDeviceWalletSigner({
  required this.address,
  required this.locator,
  DeviceSignerKeyStorage? storage,
})

Creates a device wallet signer bound to an existing hardware key.

Properties

address

final String address

The wallet address associated with this signer.

locator

final String locator

type

String get type

storage

DeviceSignerKeyStorage get storage

The key-storage adapter. Defaults to the platform-native Secure Enclave / Android Keystore implementation when not overridden.

publicKeyBase64

String get publicKeyBase64

The base64-encoded public key parsed from locator.

Methods

signMessage

Future<Object> signMessage(String message)

signTransaction

Future<Object> signTransaction(String transaction)

getMappedKey

Future<String?> getMappedKey()

hasLocalKey

Future<bool> hasLocalKey()

mapCurrentKeyToAddress

Future<void> mapCurrentKeyToAddress()

CrossmintDeserializationException CrossmintEmailOtpDialog