- Alternative non-monetary uses of blockchains, primarily for friend-groups or niche cultures - I've heard of private blockchains being used to broadcast locati

- Alternative non-monetary uses of blockchains, primarily for friend-groups or niche cultures - I've heard of private blockchains being used to broadcast locations of secret just-in-time-announced underground raves (in Berlin), so police can't just find out about it on facebook or something like that; this sort of replaces friend-of-friend word-of-mouth invitations and I guess you could implement fine-grained privacy/invitation rules this way Isn't it computer costly apart from monetary purposes