For those interested in ART, there is an IETF working group attempting to standardise it as the "Messaging Layer Security" protocol. Their website [1] has a draft protocol document [2] which explains the ART scheme from a concrete engineering perspective, which I find easier to follow than the original ART paper.
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[ 5.6 ms ] story [ 33.2 ms ] thread[1]: https://mlswg.github.io/
[2]: https://github.com/mlswg/mls-protocol/blob/master/draft-ietf...
> At the interim last week, there was agreement to remove the discussion of ART from the protocol draft and focus on TreeKEM.