export declare function saveToIPFS(params: {
    data: string;
    filename?: string;
    owner?: string;
    days?: number;
    description?: string;
}): Promise<string | undefined>;
export declare function readFromIPFS(params: {
    blobId: string;
}): Promise<string | undefined>;
export declare function getIPFSUrl(params: {
    blobId: string;
}): Promise<string>;