However, before I randomly send coins off to these addresses, I'd like to establish that they aren't addresses controlled by Nefario.
Does anyone have any suggestions on how that might be accomplished?
I'm thinking if I post the addresses and the holders are forum members we are reasonably confident aren't Nefario, they could somehow demonstrate they do in fact control the address, and then I could send the coins on. I have no idea how that demonstration could be accomplished. I'm a bookkeeper, not a developer.
Thanks for any input.
If this list is about refunding everyone 100%, first thing I'd consider is checking the list in the OP of GLBSE Payment Claims thread to identify those addresses that are still waiting for their remaining 10%.
Yet, the sum of the missing 10% from that list is tiny, compared to still pending refunds (e.g. friedcat alone is still waiting for ~1.7k BTC from GLBSE).
Your best take to verify the remaining addresses would be to post the list here and let forum members confirm via PM which they control. If those who believe their address is missing on the list also PMd you, this will give you already a quite reliable indication of how legit the list is. The only issue hard to resolve are those addresses from people not frequenting the forum or completely left Bitcoin scene. Most former GLBSE asset issuers donate the remaining funds after some wait period.
I did all this recently to repay my former investors and resolve the mess GLBSE left behind. It is a PITA lot of work and I feel sorry for you now being responsible for cleaning up mess you did not cause (alone). Good Luck.