A tutorial where you prove things without revealing things, and yes, the math actually maths. Here's something the internet doesn't want you to know: you overshare every single time you prove something. Prove you're over 21 at a bar? You hand over a card with your name, your address, your height, and your terrible 2019 haircut. Prove your income to a landlord? Here's every transaction I've made since college, please don't judge the 3am food delivery. We built the entire digital world...