2023-09-24 UTC
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angelo i'm just wading in but it appears peertube also requires it: https://github.com/snarfed/bridgy-fed/blob/49df75b73a6d14166426d3ecb00fe41019ff3bfa/activitypub.py#L462-L463 and https://docs.joinpeertube.org/contribute/architecture#communications-between-instances