opsec guide for privacy coin developers
You can start by reading how people failed at opsec here https://github.com/jermanuts/bad-opsec
Improve your privacy and security by following these guides:
https://www.privacyguides.org/en/
Don't market your project to sanctioned countries/persons, and don't acknowledge its usage in any grey area etc. Because you will be called a "Crime facilitator" and charged with "Money laundering".
It is even worse if you make a profit from it, e.g. in the form of fees/services.
Crypto mixing services:
Samourai Wallet https://www.justice.gov/usao-sdny/pr/founders-and-ceo-cryptocurrency-mixing-service-arrested-and-charged-money-laundering , https://www.justice.gov/usao-sdny/media/1349321/dl
Tornado Cash https://www.justice.gov/opa/pr/tornado-cash-founders-charged-money-laundering-and-sanctions-violations , https://www.eff.org/files/2023/08/25/van_loon_tornado_cash_order.pdf
Bitcoin Fog https://storage.courtlistener.com/recap/gov.uscourts.dcd.230456/gov.uscourts.dcd.230456.1.1_1.pdf
ChipMixer https://www.justice.gov/opa/press-release/file/1574581/download
Stop using cryptocurrency mixing service and start embracing privacy by default cryptocurrency coin like Monero (XMR). But you are still not safe https://www.coindesk.com/markets/2021/08/02/former-monero-maintainer-fluffypony-arrested-and-to-be-extradited-for-non-crypto-crimes/
Make sure to also harden your infrastructure:
https://github.com/monero-project/meta/issues/916
https://discuss.grapheneos.org/d/12122-ddos-protection-improvements-for-grapheneos-servers (https://github.com/GrapheneOS/infrastructure)
https://blog.nihilism.network/servers/endgame/index.html (https://blog.nihilism.network/servers/anon.html)
Sign releases with PGP and ensure your builds are reproducible https://guix.gnu.org/en/blog/2024/identifying-software/ (Full-Source bootstrappable)