With regards to your subject, "Re: the cause make BTC price to dump strongly". I think it has something to do with the so many negative news headlines that keeps on popping-out these days. These are the prospect of tougher regulation in China and India, and banks in Britain and the US, in particular, banning people from buying Bitcoin and other cryptocurrencies with credit cards, dreading a dive in their value will leave them unfit to reimburse their obligations.