zlingasdg··on Crypto Crash Course: Bitcoin, the Blockchain, and Proof of WorkSome basics on Bitcoin but also includes a link to a bitcoin wallet brute force to demonstrate the robustness of BTC private keys.
zlingasdg··on Picking the Widevine Locks: Acquiring and Using an L3 CDMA little writeup on Widevine DRM and generating CDMs with Android Studio.