Change:
might invalidate this, but in the meantime we should go ahead with this!
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Discussion:
Group ID: A value set by the creator <del> Epoch: 0x00000000 </del> <ins> Epoch: 0 </ins> Tree hash: The root hash of the above ratchet tree

The group thus evolves from one cryptographic state to another each time a Commit message is sent and processed.  These states are referred to as "epochs" and are uniquely identified among states of <del> the group by four-octet epoch values.  When a new group is initialized, its initial state epoch 0x00000000.  Each time a state transition occurs, the epoch number is incremented by one. </del> <ins> the group by eight-octet epoch values.  When a new group is initialized, its initial state epoch 0x0000000000000000.  Each time a state transition occurs, the epoch number is incremented by one. </ins> [[ OPEN ISSUE: It would be better to have non-linear epochs, in order <del> to tolerate forks in the history. ]] </del> <ins> to tolerate forks in the history.  There is a need to discuss whether we want to keep lexicographical ordering for the public value we serialize in the common framing, as it influence the ability of the DS to order messages.]] </ins> 10.1.