> Does it matter if my ssh public key specifies a LAN host

an ssh key does not specify a host.  e.g.

ssh-ed25519 
AAAAC3NzaC1lZDI1NTE5AAAAID9DzOVboz/9daQwQRPkxD/D4PZ4ZVNgMLqd+zc79Gl+ 
[email protected]

the [email protected] is a comment, no semantics

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