See https://en.wikipedia.org/wiki/SYN_cookies https://en.wikipedia.org/wiki/SYN_cookies The author seems to have remembered that hashes are involved and assume

See https://en.wikipedia.org/wiki/SYN_cookies https://en.wikipedia.org/wiki/SYN_cookies The author seems to have remembered that hashes are involved and assumed that it works as a proof of work, but this is nonsense.