/**
 * Browser-compatible secure key storage
 * For Node.js environment variable initialization, use the version in brightchain-api-lib
 */
export declare class SecureKeyStorage {
    private static instance;
    private readonly secureHeap;
    private readonly systemKeyring;
    private constructor();
    static getInstance(): SecureKeyStorage;
    /**
     * Store a mnemonic directly (browser-compatible)
     * @param mnemonic The mnemonic to store
     */
    storeMnemonic(mnemonic: string): Promise<void>;
    withMnemonic<T>(operation: (mnemonic: string) => Promise<T>): Promise<T>;
}
//# sourceMappingURL=secureKeyStorage.d.ts.map