There are always two most important things that crypto companies ignore: contact details mentioning and team introduction. To contact someone at CombiCoin you should send them an email and... There's no guarantee someone will reply. Because it's not something effective. It would be nice if they told more about their company: where it's located, who stands behind it, its history and so on. It's always interesting to know, moreover, it's necessary. A lack o it may ruin anyone's reputation no matter how hard they try to show they are legit... Some companies are so mysterious for no reason.