import { Transaction } from './transaction.js';
/**
 * computeGroupID returns group ID for a group of transactions
 * @param txns - array of transactions
 * @returns Uint8Array
 */
export declare function computeGroupID(txns: ReadonlyArray<Transaction>): Uint8Array;
/**
 * assignGroupID assigns group id to a given list of unsigned transactions
 * @param txns - array of transactions. The array elements will be modified with the group id
 */
export declare function assignGroupID(txns: Transaction[]): Transaction[];