It's a pitty: There's just until now no reliable* way of going short against the Bitcoin (cash) currency (see for details furthermore https://www.fool.de/2017/10/18/3-wege-um-vom-kommenden-bitcoin-crash-zu-profitieren/). With todays closing rate 13.305,01 €/BTC (see https://www.bitcoin.de/de/chart) this seems to be lucrative. If someone has any other promising idea, please let me know.
*I'm far from being able to open an account at LedgerX ... =;-)