A token can be issued for a machine's tunnel key, and it joins through the tunnel

token issue --overlay-key records the key the machine made, binds the
token to it, gives the machine its address and makes it a peer of the
hub, pushing the hub before the token is shown. The token carries the
hub's tunnel and the bus at its address on the private network, and
enrolment refuses any other key (novox/hq ADR 0169). Tokens without a
key enrol as before until the bus is closed. Also a token verb.

internal/inventory/migrations/0055-a-token-is-issued-for-a-tunnel-key.sql

@@ -0,0 +1,7 @@
+-- A token issued for a tunnel key (novox/hq ADR 0169).
+--
+-- A machine that joins through the tunnel makes its key first, and the token is issued for it: the
+-- hub is told the key before the token is shown. So enrolment must take that key and no other — a
+-- different one is a machine the hub does not know, offering a tunnel that would never answer. Null
+-- for a token issued without one, which enrols as before.
+alter table enrolment_token add column overlay_key text;