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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. Solana wallets do not support device signers. The locator must follow the device:<publicKeyBase64> format. Use CrossmintWalletsClient.createDeviceSigner to register a new device signer and get a valid locator.

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Constructors

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CrossmintDeviceWalletSigner

CrossmintDeviceWalletSigner({
  required this.address,
  required this.locator,
  DeviceSignerKeyStorage? storage,
})
Creates a device wallet signer bound to an existing hardware key.

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Properties

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address

final String address
The wallet address associated with this signer.

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locator

final String locator

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type

String get type

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storage

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

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publicKeyBase64

String get publicKeyBase64
The base64-encoded public key parsed from locator.

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Methods

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signMessage

Future<Object> signMessage(String message)

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signTransaction

Future<Object> signTransaction(String transaction)

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getMappedKey

Future<String?> getMappedKey()

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hasLocalKey

Future<bool> hasLocalKey()

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mapCurrentKeyToAddress

Future<void> mapCurrentKeyToAddress()