To not share how you secure anonymity is to rely on security by obscurity. Now I think it’s better to lay out the playbook using Kerchkoff’s principle so k will become far larger than 150. Remember… to improve anonymity, at some point you have to publish your private keys. And where better than Hacker News?
The playbook is yours. Improve it!
Step 1: try to break it. Post how you’d defeat the anonymization scheme. The threat model is that you’re all state level actors combined. I’d love to see what you come up with.