✏️🏞️
The full spread of equipment as adapted from Guild use. They come as a set - you keep your sigil badge on your person somewhere at all times, because it's keyed to you. You get a set of cards to hand out to everyone you want to be able to contact you, and a card frame for use with cards you receive; placing someone's card in the frame will cause their badge to vibrate and glow, and if they touch it to their frame you begin a two-way conversation. The picture on the card even animates. (cont.)
The stamp is for private communication. Write something on paper as normal, and then lay the recipient's card on the page. Stamp onto the card, and the mark passes through it onto the page, rendering the text invisible. The only way to make it visible (temporarily) is for the recipient to touch their badge to it. You can also stamp through your own badge, leaving a page only someone with your card can read.
The New World has no centralized Guild. When the migration happened, the people inside the Guild who knew the secrets of how to make the badges and frames and such decided it wasn't worth keeping secret - everyone would need a way to keep in touch with their old friends and companions, and the frame is a reliable way to do that. How and why the migration happened is another story entirely.
@bj .hg This sounds a lot like asymmetric cryp—aha. X3
So is there an equivalent of signing too?
There should be. Maybe just stamping a document without anything in the way does this - leaves a mark keyed to you the same way your badge is, so anyone with your card can touch it to the mark and it will glow to indicate the match.
Thanks! It was inspired by cryptography (the private key is your badge, the public key is your set of face cards to hand out), but there was a little more equipment needed to make it make sense in-world.
You can also do authentication this way; if you have someone's card and they're standing in front of you, stick the card in your frame and their badge should buzz.