Is it legal to gamble with Bitcoin in the US? Oklahoma? Asking for a friend..... lol
if you are of the age of majority, able to gamble, and have reported the bitcoin and intend to report your winnings, you should be fine. be sure to save records of your transactions within the casino, they usually have a csv you can export if you need to be able to provide a record. this is general for United States citizens; Im not quite sure of the specific laws that govern Oklahoma concerning gambling. alot of it has to do with the casino you used is licensed. if they are unregulated, that comes back on you a bit, but mostly reflects poorly on them. so use a decent casino, not a fly by night, that asks you for identity documentation (if they are legit, they pretty much have to conduct proper aml/kyc if they serve US citizens)
some clarification, did some additional research:
To be more specific, if the state or region you live in prohibits online gambling, it will not matter which form of payment is being used. Gambling is (technically speaking) not illegal on the federal level by any means. However, several US states have made gambling illegal, regardless of whether it occurs in a physical location or on the internet. The method of payment used to fund ones gambling activities, however, is a different matter entirely.