export interface UTXO {
    txid: string;
    vout: number;
    value: number;
    address: string;
    derivationPath?: string;
}
export declare const dustThreshold: (feeRate: bigint) => bigint;
export declare const dualFees: (feeRate: bigint, numInputs: number, numContracts: number) => bigint;
/**
 * Selects UTXOs for dual funding
 * @param utxos - UTXOs to select from
 * @param collaterals - Collaterals to fund (just one for non-batch tx)
 * @param feeRate - Fee rate in satoshis per byte
 * @returns Inputs and fee
 * @description
 * Add inputs until we reach or surpass the target value (or deplete)
 * Worst-case: O(n)
 */
export declare const dualFundingCoinSelect: (utxos: UTXO[], collaterals: bigint[], feeRate: bigint) => {
    inputs: UTXO[];
    fee: bigint;
};