When I hear the description of the “mailbox” I just think of a Nostr Relay. The relay doesn’t need to know that it is hosting a private Bitcoin transaction. It just needs to host a few bytes of data for someone else to retrieve. 🤔

https://fountain.fm/clip/Gj5BkZrsisVxcLGQmdaT

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too bad nostr has no metadata privacy

The IP address of the sender of the note as well as the exact date and time are logged 🤔.

This could be solved by a Nostr-Dandelion setup which doesn’t exist yet to my knowledge 😂