/// <summary>
/// create tx
/// </summary>
/// <param name="chain"></param>
/// <param name="signer"></param>
/// <param name="to"></param>
/// <param name="value"></param>
/// <param name="gas"></param>
/// <param name="nonce"></param>
/// <param name="id"></param>
/// <returns></returns>
public async Task <(Tx tx, string error)> CreateTxAsync(byte chain, string signer, string to, ulong value, ulong gas = 0, ulong?nonce = null, int id = 0)
{
return(await Cyprus.CreateTxAsync(chain, signer, to, value, gas, nonce, id));
}