There are a few things you can do to properly protect yourself against Unicoin-related scams
Verify the Seller
Of course, you should always buy your Unicoins directly from Stack Exchange, but there will always be a market for such things from people who have already bought everything they want, so to protect yourself, you should first verify the person selling the Unicoins
Look into their reputation, both in the Stack Exchange sense, and in the general sense. Look into their history as well; a seller who has only just recently started selling, and has nothing but positive comments on their sales, is likely engaging in sockpuppetry. Their account will likely be swiftly deleted, and they are just trying to hook as many people as they can before their accounts get banned. This is especially likely to be true if their offer is time-sensitive; they are trying to get you to buy before a ban gives them away.
Verify the coins
Unicoins have a number of anti-counterfeiting features you can use to tell the real ones from the fake:
- Verify the material. Unicoins, being digital, should be made from a tightly-interwoven series of tubes.
- Inspect the horn on the Unicorn; real Unicorn horns grow out of the Unicorn's head, and in an effort to glue fake horns onto their fake Unicoins' fake Unicorns, counterfeiters often leave traces of glue visible.
- Check the date stamped on the coin; real Unicorns are only present at certain times of year, and these are the only dates the coins can be mined. Time zone issues can result in some coins having a date of the day before or after, but beyond that range, the coin is likely fake.