Defines a min channel that was seen in a certain message of a certain chat.
inputChannelFromMessage#5b934f9d peer:InputPeer msg_id:int channel_id:long = InputChannel;
|The chat where the channel was seen
|The message ID in the chat where the channel was seen
|The channel ID
In some situations user and channel constructors have reduced set of fields present (although id is always there) and min flag set.