Chat Session Update

Play 0x0A, client → server.

play · 0x0A · serverbound (client → server)

Registers the player’s chat signing session: sessionUUID, key expireTime, the Mojang-issued publicKey, and Mojang’s signature over it. Sent once after joining and again if the key changes. The server verifies the key and shares it with other clients via PlayerInfoUpdate so they can validate signed messages.

Sent by the client, read by the server. Listen for it with client.on("ChatSessionUpdate", (data) => …) on the receiving side.

Fields

Send it

await client.sendPacket("ChatSessionUpdate", {
  sessionUUID: /* UUID */,
  expireTime: /* Long */,
  publicKey: /* Byte[] */,
  signature: /* Byte[] */,
});

Field aliases listed under Notes are accepted as alternative keys when writing.

Source: src/Core/Versions/776/Packets/play/serverbound/ChatSessionUpdate.ts