I have recently begun using Folding@Home and I am curious how people are prevented from cheating the system. It seems to me that unless the final result is easily verifiable users could submit bogus folds in order to quickly gain credits. Is it in fact the case that the final results of calculating a protein fold are easily verifiable?
Besides duplication as verification there are numerous other computational methods to ensure that the result is valid. Proprietary software is used for folding at home so one can safely assume that they check hashes on processors and files regularly. If integrity is broken (by a crash, memory corruption or God forbid injection) the software client side and server side trashes the result. One can imagine that faulty hardware or other problems can result in a ban from the servers.