/**
 * Bitcoin Cash transaction signing and address derivation.
 * @internal
 */
import type { UtxoNetworkParams } from '../../../ChainGate/networks/types';
/**
 * Derives the 20-byte public key hash from a compressed public key.
 *
 * @param publicKey - Compressed (33-byte) public key.
 */
export declare function publicKeyToHash160(publicKey: Uint8Array): Uint8Array;
/** A single UTXO input for BCH transaction signing. */
export interface BchInput {
    txid: string;
    n: number;
    script: Uint8Array;
    amount: bigint;
}
/** A single output for BCH transaction signing. */
export interface BchOutput {
    address: string;
    amount: bigint;
}
/**
 * Signs a Bitcoin Cash transaction.
 *
 * @param inputs - UTXOs to spend.
 * @param outputs - Destinations and amounts.
 * @param privateKey - 32-byte private key.
 * @param networkParams - Network parameters for address decoding.
 * @returns Serialized raw transaction bytes.
 */
export declare function signBchTransaction(inputs: BchInput[], outputs: BchOutput[], privateKey: Uint8Array, networkParams: UtxoNetworkParams): Uint8Array;