Prove Coin Joins actually do something for our Privacy and are have not already been cracked by Authorities yet, which would render them useless.
Here's the research paper proving the coinjoin protocol turns your coins completely anonymous:
https://eprint.iacr.org/2021/206.pdfHere's the open source code implementing that protocol that you can verify yourself:
https://github.com/WalletWasabi/WalletWasabi