“Instead of using notification transactions to exchange payment codes between merchants and customers, payment codes could be exchanged via Nostr. As opposed to other communication methods, Nostr is suitable for the exchange of BIP47 payment codes as no central authority exists to potentially censor the exchange of messages. At the same time, all direct messages on Nostr are encrypted by default, eliminating the need to compute shared secrets. By making use of BIP47 via Nostr, users can avoid the creation of UTXO set bloat via unspendable outputs and eliminate the correlation of recurring versus non-recurring payments as well as the publication of customer bases through the avoidance of toxic change and the re-use of notification addresses.”