/**
 * External signer interface
 *
 * For integrating with external signing services (Ledger, Fireblocks, etc.)
 */
import type { Signer } from './signer-types.js';
/**
 * Create external signer
 *
 * Implements HTTP-based external signing service protocol.
 * The public key is fetched from the signer service at initialization time
 * via a GET request to the same endpoint. If the service does not support
 * key retrieval, the caller must provide it separately.
 */
export declare function createExternalSigner(externalSignerUrl: string): Promise<Signer>;
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