finally a proper use case for Blockchain
Having a distributed ledger that proves that the hash of the archived page has not been modified since collection could certainly add such trust. Of course it can only prove that WBM faithfully kept a copy of the same thing that was delivered to them originally. It cannot prove whether or not:
* WBM was served a custom version of the page different to what another visitor would see
* Whether any doctoring occurred between what was served and when that block was added to the chain