These headers simply contain the key that the payload message is encrypted with, and they are seperately encrypted using the session corresponding to the counterpart device. An encrypted header is added to the message for each device that is supposed to receive it.
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The Device ID is a randomly generated integer between 1 and 2^31 - 1.
The Identity Key is a Curve25519 public/private Key pair.
In this scheme, each message is encrypted with a fresh, randomly generated encryption key.
The general idea behind this protocol is to maintain separate, long-standing axolotl-encrypted sessions with each device of each contact (as well as with each of our other devices), which are used as secure key transport channels.
As OTR sessions exist between exactly two clients, the chat history will not be synchronized across other clients of the involved parties.