Or just call it views. Could be. Parameterized replaceable event that appends all pubkeys that view it. Who would would sign it? Not the viewer. Maybe the client needs a key pair or it's a randomly generated key pair but then it would be rejected by whitelisted relays. Idk brainstorming.
Wait this sounds dope
nostr:nprofile1qqs8eseg5zxak2hal8umuaa7laxgxjyll9uhyxp86c522shn9gj8crspz9mhxue69uhkummnw3ezuamfdejj7qgjwaehxw309ahx7um5wgerztnrdakj7qgwwaehxw309ahx7uewd3hkctc58hv2s what u think about impressionable nips?
Discussion
Fuck yeah just call it views. Who's funding this
Though I think to mitigate network traffic you might need to filter down to when a client views the note exclusively as opposed to just viewing everything in the feed. Generally if I care about a post I will also check out the replies. To me this defines a view. But others may disagree