Secrets designed to be divulged and other payment oddities

About this episode

Patrick McKenzie explores the complexities of payment systems and the balance between security and user experience.

Patrick McKenzie (patio11) deconstructs the "original sin" of payments: building a global financial substrate on shared secrets that were distributed promiscuously to function. He examines the multi-decade game of Whack-a-Mole played by the industry to balance the "optimal amount of fraud" against the catastrophic conversion hit of high-friction security. From the physical failure of terminal buttons to the smartphone finally solving the lifecycle problem of cryptographic tokens, Patrick explores the technical and social reasons why we’ve moved from "something you know" to the "continuity of access" provided by the device in your pocket. – Full transcript available here: www.complexsystemspodcast.com/secondary-auth/ – Presenting Sponsors: Mercury & Granola If you have more interesting hobbies than managing your money, Mercury Personal is built for you. It allows you to automate movement between accounts—allocating paychecks and tax prep the moment they hit—with a sensible permissions model for partners or accountants. It works the way tech people expect banking to work. Go to mercury.com/personal to experience banking built by the same folks Patrick trusts for his business…

People in this episode

Host: Patrick McKenzie

Topics covered

• payments
• fraud
• security
• cryptography
• technology
• finance

Keywords

• payments
• fraud
• security
• cryptographic tokens
• financial systems
• technology

Sponsors

Mercury, Granola

Mentioned in this episode

Books & works: Bits about Money

More episodes of Complex Systems with Patrick McKenzie (patio11)

• How brokerage transfers actually work · June 4, 2026 · 44 min
• Wrong numbers and why they survive, with Aaron Brown · May 14, 2026 · 56 min
• Defendant, Censor, Politico, Spy · May 8, 2026 · 1h 5m
• How the SPLC became financial infrastructure · May 1, 2026 · 51 min
• The honey badger of payments · April 23, 2026 · 30 min
• Cash received is not revenue earned · April 16, 2026 · 33 min