Anyone can check out the witness page and see that snail and gxt-1080-sc have taken over the mining queue. Looks like
is using the same exploit to mine.
As you can see gxt-1080-sc has to perform a "key_auths" update for each block he/she mined.
And similar to gxt-1080-sc, snail has to do the same for each block he/she has mined.
If this is true it is very sad for the steem community. Because,
is own by one of the top 19 witness. See it for yourself.