/**
 * The `publicKeyMultibase` of the Ed25519 update key a seed derives, as it
 * appears in the log's `parameters.updateKeys`.
 *
 * @param options {object}
 * @param options.seed {Uint8Array}   a 32-byte Ed25519 seed
 * @returns {Promise<string>}
 */
export declare function updateKeyMultibase({ seed }: {
    seed: Uint8Array;
}): Promise<string>;
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