Block Changed Ack

Play 0x04, server → client.

play · 0x04 · clientbound (server → client)

Acknowledges block changes made by the client up to the given sequenceId. The server sends it after processing serverbound PlayerAction or UseItemOn packets that carried a sequence number. The client uses it to drop its client-side block predictions up to that sequence and accept the server’s authoritative state.

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

Fields

Send it

await client.sendPacket("BlockChangedAck", {
  sequenceId: /* VarInt */,
});

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

Source: src/Core/Versions/776/Packets/play/clientbound/BlockChangedAck.ts