There are several cryptocurrencies that were launched on May 31st, but without more information, it's difficult to pinpoint a specific one. However, here are a few examples of coins that were launched on May 31st:
1. BitZeny (ZNY) - launched on May 31, 2018
2. CryptoVerificationCoin (CVCC) - launched on May 31, 2021
3. Drip (DRIP) - launched on May 31, 2022
Please note that
this is not an exhaustive list, and there may be other coins that were launched on the same date. If you have any additional information or context about the coin you're referring to, I'd be happy to try and help you further!