Portable reputation: how can it work without a central judge?

The manifesto mentions portable reputation. Technically I see this shape:

• A buyer and a seller both sign a small receipt record after a completed deal (what, when, outcome).
• Records are stored with the owner, not in a single database.
• A profile can present any subset, and anyone can verify the signatures.

Open issues: fake transactions between friends to pump scores, and retaliation reviews. Possible mitigations: weight records by counterpart diversity, allow reply notes, and keep disputes visible.

It is a research topic, not a solved one, and I would prefer to say so out loud than ship false confidence.

Fully agree on honesty. One more issue: privacy. A reputation history can reveal who you trade with. Allow selective disclosure from day one.

As a seller: please let me hide the sums but show the count and the satisfaction. My customers should not see each other.

I can prototype the receipt format as signed JSON and write test vectors, same as for the registry. Anyone with an opinion about fields?

Wine producers need batch and vintage in the receipt. Otherwise 'excellent wine' means nothing in three years.

Great field. An optional free-form tag list with a few standard keys like batch, vintage, lot.