In the last section, we learned how to use a wallet to carry out transactions on the blockchain. But if you were paying close attention, you’ll see a problem here for everyday use:
Technically speaking, the Bitcoin blockchain can only handle about 7 transactions per second, and a new block takes an average of 10 minutes to be added. If billions of people worldwide wanted to use it to pay for their daily coffee or groceries, the system would immediately become congested and fees would skyrocket.
So how can Bitcoin become the global currency for everyone? The answer is: the Lightning Network.
Think of the Lightning Network as a digital fast lane that sits on top of the actual Bitcoin blockchain (a so-called Layer 2 network).
To understand how brilliantly this works, consider the beer coaster metaphor:
1. The beer coaster at the bar 🍻
When you go to your favorite bar and drink 5 beers throughout the evening, do you pay for each beer individually right then and there with your card and wait for the receipt every time? No. The bartender opens a beer mat for you and makes a mark for each beer.
You don’t settle the bill until the end of the evening: You pay the total amount, the mat is torn up, and there was only a single payment transaction in total.
2. That’s exactly how Lightning works 🧠
Two users (or you and a business) open what’s called a “payment channel.” That’s the beer mat. You can now send millions of transactions back and forth between yourselves—in milliseconds and virtually for free.
These individual transactions aren’t recorded on the main blockchain. Only when one of the two parties wants to permanently close the channel is the final “account balance” sent to the main Bitcoin blockchain and recorded there permanently.
3. A global network of channels 🌐
The best part: You don’t have to have a separate channel open with every business in the world. If you have a channel with Person A, and Person A has a channel with Business B, then your money can be “routed” from you to Business B via Person A in a flash, without you even noticing. The network connects to form a gigantic, global spider web.
💡 Takeaway for Part 6:
The main blockchain (Layer 1) is the secure, immutable foundation—essentially the central bank level for large, irrevocable amounts. The Lightning Network (Layer 2) is the lightning-fast, everyday layer for gum, coffee, and instant global payments. Together, they make Bitcoin unbeatable.
Right now, the system is running securely in the background and scaling to serve billions of people. But who actually decides how the software evolves? Who writes the code?
That’s exactly what we’ll cover in the next post. Part 7/8 focuses on the evolution of the code: Who programs Bitcoin? 💻
Have you ever tried the Lightning Network yourself, or was this new to you? Let us know in the comments and be sure to follow us! 👇
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