Technically speaking, there are two sliders, one for the default average score and one for the degree of certainly which is a number between 0 and 100 percent. Every attestation also must come with a “certainty” in that attestation, although in my proof of concept I set it to a fixed 80 percent to keep things simple. When the Grapevine calculates an average score, it also calculates a certainty in the average score: low if the average is generated from a small number of attestations from users with low influence, high if it’s from a lot of users with high influence.

I know this sounds complicated, and it is complicated from a dev perspective, but it is NOT complicated for the user. Most of this functionality is hidden from the user at first, unveiled only when the user needs it to solve attacks by bad actors, which WILL happen eventually, but not until the grapevine catches on.