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The Jan-May 2021 spam attack was already resolved by a combination of frontier scanning bug fixes & balance + "least-recently-used" prioritization. The spring 2022 node dos/spam was mitigated by the unchecked memory table, vote hinting tweaks, magic byte + network byte checks, and a few other bugfixes/optimizations from 23.1 (unchecked table insert checks, better memory management, improved vote request processing, etc). Plus improved vote hinting now in V24. Can never say for sure that spam is "fixed" since it's more of a sliding scale imo, but I don't think it's fair to call Nano vulnerable to spam at this point.