import { Signature, Arrayish } from "ethers/utils";
import { Wallet } from "ethers";
import { TransactionRequest } from "ethers/providers";
/**
 * Verifies a signed message using the secp256k1 library. It is an optimisied library for signature verification
 * and it is faster than etherj's elliptic.
 * @param message Message
 * @param signature Signature
 */
export declare function verifyMessageSecp256k1(message: Arrayish | string, signature: Signature | string): string;
/**
 * Sign a transaction using secp256k1
 * Based on https://github.com/ethers-io/ethers.js/blob/v4-legacy/src.ts/wallet.ts#L69
 * @param tx A full and unsigned transaction without the from field
 * @param wallet Signer of transaction
 */
export declare function signSecp256k1(tx: Omit<TransactionRequest, "from">, wallet: Wallet): Promise<string>;
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