Is There a Way to Solve This Problem?

Pivotingrofile is a decentralised file-storage system. Users can pay for extra storage space by staking their own tokens on the network. If someone corrupts his files, they don't get paid and if they don't return them fast enough, they lose their token. The idea behind pivotingrofile was to make it cheaper than buying new servers but still give people confidence in each other's work.