Sort:  

I think combined.
Steem distribution: 75 percent proof of brain (the rewards), 10 percent proof of stake (interests on Steem Power) and 15 percent rewards of the witnesses (not exactly delegated proof of stake but similar).
Maybe I didn't give enough options.

Voting system with the elected witnesses is clearly a delegated proof of stake method.

deleted

Coin Marketplace

STEEM 0.18
TRX 0.16
JST 0.030
BTC 68180.36
ETH 2642.05
USDT 1.00
SBD 2.70