kennytv

Signed chat

This gist intends on clearing up some of the misinformation surrounding signed chat/the reporting feature Mojang has added to Minecraft 1.19.1. Here you can find both technical information as well as a general explanation of how these work.

Profile keys

After joining a server, clients now send a profile key used for verifying a message's authenticity. This key and thus the whole signing process is optional, but by default, servers enforce secure profiles for clients to send chat messages. Whenever the player sends a chat message and has a key associated, the message will be signed using their own private key, which the server then verifies using the public key sent after join. Assuming signature, timestamp, and message contents line up, the message goes through.

On the other end, clients can also require all broadcasted player messages to be signed, disregarding the ones without sender verified signatures.

Message signatures

HeathLoganCampbell

SkyPaper

Uploading and download Minecraft worlds from mysql

The idea was to be able to upload worlds to a database so that we could have multiple servers upload and download them at will to enable load balancing for servers such as skyblock as the demands of scalable 1.17 servers grow while the performance falls version to version.

The important idea here was to see if it was possible to upload worlds to a database, which the answer is yes :D. but this even works better for skyblock servers as they are mostly air, which allowed us to do a small optimization. which is when a chunk is empty, we don't have it, as generating empty chunks is cheap as chips, but storing them has about 500B of overhead. so it ends up taking longer to fetch them from the database, then just generate them.