I think Nitrogen sport give a deposit bonus also.
This is not true Nitrogen dont offer any deposit bonus but you can earn a freebet by joining from their mma promo. I recommend fortunejack. They give 100% deposit bonus every first week of the month. And you can use immediately your bonus. But you cant withdraw it. Only the profit and capital that you invest. I hope it helps OP. 
Fortunejack isnt a sportsbook as far as i know we are talking about sportsbook here not bitcoin betting site with bonus. I don't know how possible is to use this bonus on sports book, usually bonus is for casino games only. For sure bonus can't be used on poker, but for sports I don't know at all.
I see you are talking about deposit bonuses, but did anyone really used this bonus on sports betting?
I have used no deposit bonus once from coinbet they had a thread on games and round requirements are the same with any kind of bonus from bitcoin casinos you need to rollover the bonus for X times.I see you are talking about deposit bonuses, but did anyone really used this bonus on sports betting?