I am not an attorney, so I refrain from offering legal advice. I can say that if I didn’t know what I owned, I would check the title and verify my interests, but I have the means to do so readily available to me.
I can also say that I have seen plenty of others that signed OGL’s on a speculative basis and there were no meaningful repercussions, just make sure there is either a stricken the warranty clause or no warranty clause in the lease. Be aware that in the event that you do not own an interest that you could be asked to repay the bonus monies.
In your case, at $50 per NMA it is not likely to be worth hiring a landman to verify your interests at this time. If the well hits, then you may need to do so later or obtain a copy of the title opinion that the operator will likely do on the well.
In lieu of running title yourself, ask from those making the offers to see the pertinent portion of the ownership report showing your interest and any title requirements that may be attached to your ownership.
OR
You could wait till pooling and elect under the pooling. This is generally the safest option and the most risk adverse while still ensuring you obtain a fair market value for the lease and providing you some basic protections that a blank non-negotiated lease will not give you. The major downside is if they back out of drilling the property before they make it to pooling, you will miss out on the bonus monies.