Yes, betting is off-chain, what do you mean by "betting will be so low" ?
Thanks for your input
I said because you said the seeds will be on the other server. So in every bet user will make a HTTP request to remote server to get his seed? This should slowed the betting.
We have developed a specific solution to this issue : a stand-alone roll server, to be deployed on a machine managed by large investors, or an highly trusted third party.
The server seed is hash is retrieved when the account is created and every time a player chooses to refresh it.
The lucky number on the other hand, is retrieved on every roll via HTTP request, so this might cause an overhead, however we did not experience a degradation of performances in our testing.