This is pretty near:
Detect breaches with Canary credit cards!
TL;DR;
Today we’re releasing a new Canarytoken type: actual credit cards!
1. Head over to canarytokens.org;
2. We give you a valid credit card (number, expiration, and CVC);
3. If anyone ever attempts to use that card you’ll be notified.
https://blog.thinkst.com/2023/01/swipe-right-on-our-new-credit-card-tokens.html
Sometime in the 90's I worked up a proposal for virtual credit credit cards with all of the features of a credit card but backed by actual credit cards which you could keep private.
That meant you could finance both privately and using combinations of credit cards.
There was an additional wrinkle of creating CC numbers just for a specific purpose.
It didn't fly at the time.
I tend to avoid thinking about that.
Lojicholia enshrines triumph
Simon Lucy
Exandra