import { type PrivateKeyAccount } from 'viem/accounts';
import { type Address } from 'viem';
export interface WalletInfo {
    address: Address;
    hasPrivateKey: boolean;
}
/**
 * Save encrypted private key to file
 * SECURITY: Never logs private key, only address
 */
export declare function saveWallet(privateKey: string, password: string): {
    success: boolean;
    address?: Address;
    error?: string;
};
/**
 * Load wallet from encrypted file
 */
export declare function loadWallet(password: string): {
    success: boolean;
    address?: Address;
    error?: string;
};
/**
 * Delete wallet file securely
 * SECURITY: Overwrites file with random data before deletion
 */
export declare function deleteWallet(): {
    success: boolean;
    error?: string;
};
/**
 * Check if wallet exists
 */
export declare function walletExists(): boolean;
/**
 * Get current wallet info (without exposing private key)
 */
export declare function getWalletInfo(): WalletInfo | null;
/**
 * Get current account
 */
export declare function getCurrentAccount(): PrivateKeyAccount | null;
/**
 * Get current private key (internal use only)
 * SECURITY: This should only be called by blockchain client
 */
export declare function getCurrentPrivateKey(): string | null;
/**
 * Check if wallet is loaded
 */
export declare function isWalletLoaded(): boolean;
/**
 * Update wallet with new private key
 */
export declare function updateWallet(newPrivateKey: string, password: string): {
    success: boolean;
    address?: Address;
    error?: string;
};
/**
 * Change wallet password
 */
export declare function changePassword(oldPassword: string, newPassword: string): {
    success: boolean;
    error?: string;
};
/**
 * Get wallet storage path (for info purposes)
 */
export declare function getWalletStoragePath(): string;
/**
 * Clear wallet from memory (for logout/security)
 */
export declare function clearWalletFromMemory(): void;
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