/**
 * Persistent change note store.
 * Stores change notes from partial unshields so they can be spent in subsequent operations.
 *
 * Uses a JSON file in the user's home directory (~/.b402/change-notes.json).
 * Falls back to in-memory if file I/O fails (browser environment).
 */
export interface StoredChangeNote {
    [key: string]: any;
}
export declare function storeChangeNote(walletKey: string, note: StoredChangeNote): void;
export declare function getChangeNotes(walletKey: string): StoredChangeNote[];
/** Alias for getChangeNotes (used by utxo-fetcher) */
export declare const getStoredChangeNotes: typeof getChangeNotes;
export declare function removeChangeNote(walletKey: string, noteHash: string): void;
export declare function clearChangeNotes(walletKey?: string): void;