import { BridgeId, NetworkId } from './types';
interface FetchSignatureParams {
    chainId: NetworkId;
    txHash: string;
    bridge: BridgeId.cctp | BridgeId.cctpV2;
    maxRetries?: number;
    pollInterval?: number;
}
interface SignatureResult {
    messageBytes: string;
    attestationSignature: string;
}
export declare const fetchSignature: (params: FetchSignatureParams) => Promise<SignatureResult>;
export {};