Ok fair enough, just to be clear before the fix you released could XDN have been attacked the same way as XMR. We know XDN was not attacked but it has been widely spread that all cryptonotes had the same flaw.
I will be brief as usual D< :
1. This vulnerability is a double spend vulnerability.
2. This vulnerability is possible only if blockchain split occurs. Can call it fork.
3. Split or fork is possible with long attack preparation and that preparation is visible to those who watch the blockchain.
4. XDN devs watch blockchain 24/7 to avoid that kind of issues.
5. 1->2->3->4-> XDN IS and WAS invulnerable
P.S. XDN devs fixed any related issues, and were first team who did that.
https://github.com/ducknote/ducknote/commit/e9dcc9825601f5a7b209c78e3a61169ba4f31fbc
Thank you, That should clear it up