We've already tackled reputation systems, they were called web site
certificates. You have to submit to a few fairly stringent checks on
who you are, typically provide a D&B id which isn't very expensive or
difficult but not all that easily defrauded w/in some reasonable
parameters (it ain't bank security but it's good enough to be pretty
sure you're giving your credit card info to who you think you are,
damn, you hand your card to strange bartenders right?)
This is accreditation, not reputation.