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Validate the genesis config downloaded over RPC before accepting it #8474
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This PR replaces #8467, and additionally adds verification of a downloaded genesis.tar.bz2 before accepting it. If an RPC node serves a bad genesis, that node gets blacklisted and the validator tries another.
This should be sufficient to prevent the Chorus One poisoned genesis attack during SLP2 boot from reoccurring. However note that the Certus One bzip2 bomb as described by #8427 is not fixed here.
This also might be a fix for Harden untrusted genesis file consumption #7919, what do you think @ryoqun?- update: no, because it doesn't consider genesis deserialization