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Fix border condition in Snowbridge free consensus Updates (#5671)
# Description A fix for a border condition introduced with new feature #5201. A malicious relayer could spam the Ethereum client with sync committee updates that have already been imported for the period. This PR adds a storage item to track the last imported sync committee period, so that subsequent irrelevant updates are not free. Original PR: Snowfork#172 ## Integration Downstream projects are not affected. Relayers will not be able to spam the Ethereum client with irrelevant sync committee updates for free. ## Review Notes Adds a storage item to track the last free sync committee update period, so that duplicate imports are not free. --------- Co-authored-by: Adrian Catangiu <adrian@parity.io>
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