Sort:  

No, it's not possible for a miner to hijack the steem blockchain as miners don't generate a large enough number of blocks in a round (Steem uses hybrid POS and POW for block creation).

Is the PoS part based on Steem or Steem Power holding?

I see. Thanks for the answer @blocktrades.

Coin Marketplace

STEEM 0.18
TRX 0.16
JST 0.029
BTC 62299.02
ETH 2440.23
USDT 1.00
SBD 2.65