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Peer-derived sync state could bypass height validation, request rate limiting, and block-fetch deduplication at boundary conditions. Reject invalid remain counts and overflowed heights, apply sync-chain rate limiting to every request, and size the block ID cache to cover the full valid fetch window.
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Peer-derived sync state could bypass height validation, request rate limiting, and block-fetch deduplication at boundary conditions.
Reject invalid remain counts and overflowed heights, apply sync-chain rate limiting to every request, and size the block ID cache to cover the full valid fetch window.
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