Attesters issue attestations from claims aboutgroup membership that are made by users. Groups must be available to the attester.
Group membership claims
Technically, a user claim consist of:
A targeted available group identifier ("I own an account that's part of the 'ENS DAO voters' group")
A claimed value ("My account has a value of >3; I voted more than 3 times")
(Optional) Some arbitrary data ("The group of 'ENS DAO voters' was generated on June 12th, 2022")
Sismo has built an off-chain infrastructure that periodically generates off-chain groups. Groups are bi-dimensional. These off-chain groups are reusable, they can be used to make available groups for several attesters.
The off-chain group of ENS DAO Voters can be made available to several on-chain attesters
Every off-chain group has a name and a generation timestamp.
Groups can be combined by creating unions, intersections, and more complex operations. More on groups.