/**
 * Secure HD wallet key storage using IndexedDB + WebCrypto AES-GCM.
 *
 * Stores encrypted mnemonic phrases. All derived keys are re-derived on unlock.
 * Plaintext metadata (xpub, peerId) is stored for quick identity lookups
 * without decryption.
 */
export interface WalletMetadata {
    id: string;
    account: number;
    xpub: string;
    peerId: string;
    method: 'pin' | 'passkey' | 'password';
    createdAt: number;
}
export declare class HDKeyStore {
    private db;
    /**
     * Open the key store database.
     */
    static open(dbName?: string): Promise<HDKeyStore>;
    /**
     * Store an encrypted mnemonic.
     * Returns the wallet ID.
     */
    store(mnemonic: string, pin: string, account: number, xpub: string, peerId: string, method?: 'pin' | 'passkey' | 'password'): Promise<string>;
    /**
     * Retrieve and decrypt a mnemonic.
     */
    retrieve(id: string, pin: string): Promise<string>;
    /**
     * Check if any stored wallet exists.
     */
    hasStored(): Promise<boolean>;
    /**
     * List all stored wallet metadata (without decryption).
     */
    listMetadata(): Promise<WalletMetadata[]>;
    /**
     * Get metadata for a specific wallet without decryption.
     */
    getMetadata(id: string): Promise<WalletMetadata | null>;
    /**
     * Delete a stored wallet.
     */
    delete(id: string): Promise<void>;
    /**
     * Close the database.
     */
    close(): Promise<void>;
}
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