Linking wormholes
When a signature is a wormhole, it can be linked to the connection it represents on the map. This ties the in-game signature ID to that connection, so the whole group knows exactly which hole in space leads where.
How a signature gets linked
Linking is deliberate, not automatic — pasting a scan won't guess which hole goes where. A signature is tied to a connection when you record the jump through it: as you map as you fly, you pick the signature you jumped through, and that signature is attached to the new connection.
If a signature stops being a wormhole (for example a re-paste reclassifies it), its connection link is cleared automatically.