Verifiable attributes #2280
Description
Is your feature request related to a problem? Please describe.
Any node operator can set any attribute for their node on the network. We can't have some controlled group that uses an attribute no one else can use, while this might be useful.
Describe the solution you'd like
One simple approach is just to have a public group key and some signature derived from the corresponding private key, similar to the way NEP-15 groups are designed (https://github.com/neo-project/proposals/blob/master/nep-15.mediawiki#user-content-Group). It may be not the most convenient one at the same time.
Describe alternatives you've considered
Another approach could be reusing NNS with some special key/address entries for nodes. Maybe there are some other ones.