keychat on Nostr: If the re-publisher uses the same receiving address, it seems that two envelopes are ...

If the re-publisher uses the same receiving address, it seems that two envelopes are not necessary. Instead, a single envelope can include two receiving addresses (a feature supported by Nostr). The first receiving address is the re-publisher's receiving address, and the second address is the true recipient's nearly one-time receiving address. The re-publisher receives the message from relay X and then forwards it to relay Y. The recipient retrieves the message from relay Y.