they change player seeds on one large bet and i know this as a fact as i changed the seed before hand because it was a big bet
also 1btc is a lot of bets and many more bets placed all pretty good volume
its about house edge and lies they say
How can you verify this? I am playing with for long time and until this day but never have face any cheating problem on their seeds because every bet on their site can be verified and every bets is free of cheating. So if you just lose big amount like you said then you might bet small amount again and again to get your winning. Just because you are losing, does not mean bitvest has done anything wrong with your seeds