Problems with Verification
Verification helps solve misconfigs, but relies on the fact that the same misconfig doesn't affect both sources of information (BGP and whatever you are verifying against).
The more automated the process, the more likely this is to occur. (e.g. if you build your router configs from IRR style objects, as indeed does the RA, then any mis-registration there would cause a leak which would in turn be verified as accurate).
Verification helps with 7007, 129/8, and router bugs
Only authentication will really help with the black holes and malicious attacks