This.
Cooerce changes.
There used to be Macy's and Sears catalog stores.
You'd walk in, look at a paper catalog and page through to buy the thing you want, write down a code on a piece of paper and then give a lady money and your code behind the counter. You would trust them and wait for your item to come in, then go pick it up at the same store.
NOSTR via DM is no different.