How Does the Bitcoin Blockchain Work? | Ep. 25 — Sat Chats Short Stacks

In this Sat Chats Short Stack, Chris and Stewart break down one of the most confusing parts of Bitcoin: the blockchain. This is your crash course in the foundation of Bitcoin, built for beginners but juicy enough for veterans. They compare it to a spreadsheet with tabs — each tab is a block of Bitcoin transactions, locked in and time-stamped. Each new tab connects to the one before it, creating a secure, unbreakable chain. Chapters 00:00 Intro: What the heck is a blockchain? 01:05 What is a block? (Spreadsheet tab analogy) 03:02 What goes inside a block (transactions, timestamps, nonce) 04:45 How blocks get “chained” together 06:33 Why you can’t go back and change past blocks 08:01 Sat Chats analogy: Faking a past episode 09:15 Why chaining blocks makes Bitcoin secure 10:32 What decentralization really means (21,000+ nodes) 12:03 Why it’s not “just a Google Sheet in the sky” 13:15 Final thoughts We cover: ✅ What is a block and what’s inside it ✅ How blocks get “chained” together ✅ Why tampering with Bitcoin is basically impossible ✅ What decentralization really means (and why it's not Google Sheets) ✅ Why you don’t need to trust banks anymore They explain why you can’t rewrite the past, why faking a Sat Chats episode would be just as impossible, and how 21,000+ independent nodes around the world keep the whole system honest — no central server, no spreadsheet in the sky, just unstoppable code.