import { Network, PsbtOutputExtended } from '@btc-vision/bitcoin';
import { UTXO } from '@btc-vision/transaction';
export declare class TransactionHelper {
    static estimateMiningCost(utxos: readonly UTXO[], extraOutputs: readonly PsbtOutputExtended[], opReturnLen: number, network: Network, feeRate: number): bigint;
    private static varIntLen;
    private static estimateVBytes;
}