Example:

I bought soap from nostr:nprofile1qy28wumn8ghj7ctvvahjuat50phjummwv5hszrnhwden5te0dehhxtnvdakz7qpqzzmxvr9sw49lhzfx236aweurt8h5tmzjw7x3gfsazlgd8j64ql0sx6f08g. It's great. It's one thing for me to say it's great. It's another for me to sign a note that can be verified (I'm lose on the details here) by soapminer as being from a real customer.

Enough of these collected, and you end up with a product view that shows all those in my wot who've also bought and "trust" the product. Binary trust or don't, recommend or don't, or a 5-star thing. I don't know.