import type NDK from "@nostr-dev-kit/ndk";
import { type NDKUser } from "@nostr-dev-kit/ndk";
/**
 * Extract hash from a Blossom URL
 *
 * @param url URL to extract hash from
 * @returns SHA-256 hash or undefined if not found
 */
export declare function extractHashFromUrl(url: string): string | undefined;
/**
 * Fix a Blossom URL by finding an alternative server with the same blob
 *
 * @param ndk NDK instance
 * @param user NDK user
 * @param url URL to fix
 * @returns Fixed URL or original if not fixable
 */
export declare function fixUrl(ndk: NDK, user: NDKUser, url: string): Promise<string>;
/**
 * Get a blob by its hash from one of a user's servers
 *
 * @param ndk NDK instance
 * @param user NDK user
 * @param hash SHA-256 hash of the blob
 * @returns URL to the blob if found
 */
export declare function getBlobUrlByHash(ndk: NDK, user: NDKUser, hash: string): Promise<string>;
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