We could start out with simpler json. Don’t add all the fields until we need them.

For zap.store, start out with a WoT score derived from follows, maybe calculated the same way coracle or wikifreedia calculate WoT scores. Then introduce an explicit attestation of trust tailored to the zap.store, like:

{
  rater: pk1,
  ratee: pk2,
  ratingType: trustToRateProductsOnTheZapStore,
  category: electronics,
  rating: 100 // 0 = don’t trust, 100 = trust
}

Gradually phase out follows and use the above attestations instead.