Is the stream ID (_id) unique between all channels?

When calling https://api.twitch.tv/kraken/streams/:channel we are getting back a stream object. This stream object has an “_id” field.

My questions is whether this id is unique for the current channel or unique between all channels?

It is unique to the channel but I’m not sure if it changes every time that channel streams - not something i’ve looked at before!

The stream’s _id is unique to the stream.