>Perhaps this is one use of a blockchain which could add credibility to reviews. Amazon offers the option to only view reviews from confirmed purchasers. The

>Perhaps this is one use of a blockchain which could add credibility to reviews. Amazon offers the option to only view reviews from confirmed purchasers. The problem is that people often receive free products in exchange for the review. "The blockchain" would show that the buyer sent BTC to the seller, but it does nothing to address the fact the seller can put more things into a box and ship them after the review is posted.