Original text:
transcript of group operations, using the transcript hash from the provisional GroupState object: <del> [[ OPEN ISSUE: The confirmation data and signature data should probably cover the same data as the one we cover with the GroupState. ]] </del> HMAC RFC2104 uses the Hash algorithm for the ciphersuite in use. Sign uses the signature algorithm indicated by the signer's credential in the roster. <del> [[ OPEN ISSUE: The Add and Remove operations create a "double-join" situation, where a member's leaf key is also known to another client. When a member A is double-joined to another B, deleting A will not remove them from the conversation, since they will still hold the leaf key for B.  These situations are resolved by updates, but since operations are asynchronous and members may be offline for a long time, the group will need to be able to maintain security in the presence of double-joins. ]] </del> [[ OPEN ISSUE: It is not possible for the recipient of an handshake message to verify that ratchet tree information in the message is accurate, because each node can only compute the secret and private Application secret is used to bind the Application messages with the next key and add some freshness. <del> [[OPEN ISSUE: The HKDF context field is left empty for now.  A proper security study is needed to make sure that we do not need more </del>  information in the context to achieve the security goals.]] [[ OPEN ISSUE: At the moment there is no contributivity of

Reviewer comments:
Clean up some OPEN ISSUES that aren't open any more Make the welcome/add diagram clearer
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Revised text:
transcript of group operations, using the transcript hash from the provisional GroupState object:  HMAC RFC2104 uses the Hash algorithm for the ciphersuite in use. Sign uses the signature algorithm indicated by the signer's credential in the roster.  [[ OPEN ISSUE: It is not possible for the recipient of an handshake message to verify that ratchet tree information in the message is accurate, because each node can only compute the secret and private Application secret is used to bind the Application messages with the next key and add some freshness.  <ins> [[ OPEN ISSUE: The HKDF context field is left empty for now.  A proper security study is needed to make sure that we do not need more </ins> information in the context to achieve the security goals.]] [[ OPEN ISSUE: At the moment there is no contributivity of