I had a couple of conversations with forum members about Antaui's keys. This is all anecdotal since they do not have a website or since no literature from them exists that I have seen; however, all of these coins seem to have been preloaded with 5 WDC. No public keys were issued. So, owners could only peel and redeem using the private key. That's the theory until someone offers up better verified info.
Here's the original [ANN] from the now defunct Worldcoin Forum page, cached on the wayback machine.