Many other altcoin rising above 50% but blk down to 100% I bought above 5000sat when btc price at 4700 usd now I am double loss with this shit!
Well then I guess you made a stupid decision.
The worst part about Cryptos is now every stupid idiot who thinks they're expert investors come and blame the investment for their loss

I don't like to call people stupid because they are beginners..This is all part of learning.
Stupid decision is to sell! Once when you already made a decision and bought it, wait! You are not loser if you hold. Maybe your funds are frozen but this is how investment functions. BLK is very good coin and from time to time price go over 10k and you only need to wait. I wont mention segwit and what can happen in near future, this kind of talk is held in speculations.
This falling is caused by BTC, and you can see BLK slowly recovers.