This got buried in two other threads ( https://mailarchive.ietf.org/arch/msg/dmarc/E9fOn8dIEiFqQJBz1GyFUimWVcM, https://mailarchive.ietf.org/arch/msg/dmarc/Bv55cS12p41j3XhWzuu5RybvzTA) so I'm just raising it to the top level.
Algorithm rotation is clearly more complex in ARC where you only have a single chain than with DKIM where you can just affix multiple signatures. That said, section 10 of the current draft ( https://tools.ietf.org/html/draft-ietf-dmarc-arc-protocol-10#section-10) feels clunky and itself says it needs more work. Assuming we're proceeding as an Experiment, I propose we address rotation in a separate draft.
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