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PolyMC
A custom launcher for Minecraft that allows you to easily manage multiple installations of Minecraft at once (Fork of MultiMC)
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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
it works using private-public key cryptography, messages you send in the new versions have an additional field, the signature which confirms that you were the sender of the message. older versions are safe because they don't have that bs. no, you cannot fake other people's signature, yes there is a mod to disable sending the signature in newer versions: https://www.curseforge.com/minecraft/mc-mods/no-chat-reports on hypixel the messages will not be sent to the clients with the signature, at least not to the older ones for sure. they would have to give up rank display in chat to support the encrypted messages, which - let's face it - will not happen
Woah PolyMC has updated a lot. It looks like they made Mojang accounts work (as you implied) and it seems like they've also made a lot of improvements over MultiMC. I tried it several months ago when it didn't seem that different from MutliMC, but I'll try it again when I get the chance.