I would suggest using the block_id of a pre-selected future block instead of the transaction_id. The block_id can be influenced only by the block producer (witness) that produces that block, so that would require a corrupt witness to influence which would then lead to a loss of witness votes if found out which should provide a certain level of deterrence.
Only a very, very limited level of deterrence, because there is not really any way to tell that the witness is colluding. The rigged winner(s) can be some 'third party' shill that has no visible association with the witness (or lottery operator).
All of these sorts of simple methods of generating randomness from a blockchain are flawed and unsuitable if there is significant money at stake or a high value attached to the service being trusted and not subject to FUD attacks of being rigged (whether or not accurate). There are some decent methods but they are much more complicated.
Yes, you are right, but like you said it also depends on the amount of money at stake. Also if a witness does purposely generate a certain block id, they would have to add some "random" data to the block that might be noticeable if scrutinized. Also you could limit the block used to one produced by a top 20 witness vs a backup witness, as top witnesses (like yourself!) are even further incentivized not to do things like this.
Also if you have some time I would be interested to discuss some of the "decent methods" you mentioned. In any case, thank you for the response!
This can be largely if not entirely avoided. For example, the block producer can make changes to the block that are plausible to happen by accident, for example, simply omitting one or two transactions, changing the order, etc.
I may make a survey post about it when I have time.
I sent 1 sbd for daily, nothing I got back its been 2nd day so I don't know how legit this lotto is, don't invest on daily or weekly. it worked for 1hour I sent 0.1 sbd I got 0.001 sbd. before sending, nothing fair about this lotto. I lost 1.1 sbd so don't send any money for. lotto.
Do you have more information about this? I would like to read into it.