It's true, Bitcoins are used in a very bad way. But that doesn't necessarily mean that the concept of crypto-currency in general is haram. I'm not saying it's halal either, I'm just saying that the first doesn't imply the other.
https://islmcoin.com is created for all our brothers and sisters to give Zakah, eliminates the institutions in-between and ensures that your giving reaches to the needy. It requires the first Islamic cryptocurrency ( $ISLM ) for its transactions. You can purchase $ISLM, add your charity campaigns and donate Zakah to charities. Here is the whitepaper of $ISLM coin: https://drive.google.com/file/d/19_BmDOt5brrutH_R3hsPgxHOGj6GLaBf/view
“There is no compulsion in religion. Verily, the Right Path has become distinct from the wrong path. Whoever disbelieves in Taghut and believes in Allah, then he has grasped the most trustworthy handhold that will never break. And Allah is All-Hearer, All-Knower.” Surah Al-Bacarat 256
