Part 8: Using Bitcoin — Payments and Lightning Network
Bitcoin on its own is like gold — great for storing value, but awkward for buying coffee. The Lightning Network turns it into cash — instant, cheap, and usable anywhere.
By now you know how to buy Bitcoin (Part 6) and how to store it safely (Part 7). But the whole point of Bitcoin — going back to Satoshi’s white paper — was electronic cash. Money you can spend.
In this part, we’ll cover what happens when you actually try to spend Bitcoin, why the base layer isn’t ideal for everyday payments, and how the Lightning Network fixes that. We’ll also look at real-world adoption, the wallets you need, and the weird future of streaming money.
The Problem: Bitcoin’s Base Layer Is Too Slow for Coffee
Bitcoin’s base layer (the blockchain) is designed for one thing above all else: security and decentralization. Every transaction gets permanently recorded in a block, verified by thousands of nodes worldwide, and guarded by an enormous amount of computational power.
That’s amazing for a settlement layer — the financial equivalent of a bank vault. But it’s terrible for buying a coffee.
Here’s why:
| Problem | Details |
|---|---|
| Limited throughput | Bitcoin processes roughly 7 transactions per second. Visa handles 24,000. |
| Confirmation time | A transaction takes ~10 minutes on average (and you typically wait for multiple confirmations). |
| Fee volatility | During congestion, fees can spike from cents to tens of dollars per transaction. |
| Irreversibility | Great for security, but no “undo” button if you fat-finger the wrong amount at a counter. |
A 8 in transaction fees is not a viable payment system. For years, critics said Bitcoin couldn’t scale.
Then came the Lightning Network.
The Bar Tab Analogy: Understanding Lightning
The simplest way to understand Lightning is with a bar tab analogy.
Without Lightning (on-chain): Every time you buy a drink, you pull out your wallet, hand over cash, and get change. Each transaction is individually recorded. If you buy 10 drinks, that’s 10 separate blockchain transactions — slow, expensive, and wasteful.
With Lightning: You open a tab. The bartender notes your name, and every drink just gets added to your running total. At the end of the night, you settle the total in one single payment. Nobody recorded every individual drink on the blockchain — just the opening and closing of the tab.
That’s Lightning. It’s a second-layer protocol (often called Layer 2) built on top of Bitcoin. You open a payment channel by making an on-chain transaction. Inside that channel, you can send thousands of tiny, instant, near-free payments back and forth. When you’re done, you close the channel with a single on-chain transaction that reflects the net result.
This means:
- Only two transactions hit the blockchain — opening and closing the channel
- Everything in between is instant — milliseconds, not minutes
- Fees are fractions of a cent — no matter how many payments you make
- You can route through other people’s channels — you don’t need a direct channel with every merchant
How Lightning Actually Works
Step 1: Open a Channel
Alice wants to spend Bitcoin on Lightning. She creates a payment channel with Bob (or with a node on the network). This requires an on-chain Bitcoin transaction that locks some amount of BTC into a multi-signature address — think of it as “funding” the tab. Both parties sign the opening transaction.
Step 2: Transact Inside the Channel
Now Alice and Bob can send payments back and forth instantly. Each payment updates a balance sheet that both parties hold. The key innovation: if Alice tries to cheat by broadcasting an old (outdated) balance state, Bob can punish her by claiming all the funds. This mutual deterrence makes the channel trustless — you don’t need to trust Bob, you just need the cryptographic rules.
Every time Alice sends 10,000 satoshis to Bob, they both update their private copy of the latest balance. No blockchain involved. No miners. No fees (beyond routing fees, which are negligible).
Step 3: Close the Channel
When Alice is done, she or Bob broadcasts the final balance state to the blockchain. The channel closes, and each party receives their net balance. Only the opening and closing transactions ever touch the blockchain.
Routing: The Secret Sauce
You don’t need a direct channel with every merchant. Lightning uses multi-hop routing — payments find a path through the network of interconnected channels, like how an email finds its way through the internet. The protocol uses Hash Time-Locked Contracts (HTLCs) to ensure that either the entire payment succeeds, or nothing happens. Every hop along the path gets a tiny routing fee (typically a few satoshis).
On-Chain vs Lightning: The Comparison
Here’s the practical difference between spending Bitcoin on-chain vs. over Lightning:
| On-Chain (Base Layer) | Lightning Network | |
|---|---|---|
| Speed | 10-60 minutes (plus confirmations) | Milliseconds |
| Fee range | 50+ (congestion dependent) | 0.1 - 10 satoshis (~0.01) |
| Finality | After ~6 confirmations (~1 hour) | Instant (for small payments) |
| Best for | Large transfers, cold storage, settlement | Small payments, everyday spending |
| Privacy | Pseudonymous (public ledger) | Better (routed through multiple nodes) |
| Capacity | ~7 TPS globally | Millions of TPS (theoretically) |
| Requires | Only a wallet address | Lightning wallet + inbound liquidity |
Key insight: These aren’t competing technologies. They’re complementary. On-chain is your savings account. Lightning is your checking account. You move money between them as needed.
Real-World Adoption
El Salvador
In September 2021, El Salvador became the first country to adopt Bitcoin as legal tender. The government launched Chivo Wallet, a Lightning-enabled wallet, and gave every citizen $30 in Bitcoin to start. While the rollout was controversial — technical glitches, protests, and International Monetary Fund criticism — it was the first real-world test of Bitcoin as national currency.
By 2024, adoption had stabilized. Remittance payments ($7B/year flows into El Salvador) became cheaper via Lightning than traditional wire transfers. Small businesses, street vendors, and restaurants across the country accept Bitcoin payments through Lightning.
(Note: In early 2025, El Salvador amended its Bitcoin Law, making Bitcoin acceptance optional rather than mandatory for businesses, but the infrastructure and adoption remain.)
Merchant Adoption
A growing number of merchants accept Bitcoin via Lightning:
- Strike — A payments app that lets you send Bitcoin instantly (or convert to fiat on the other end). Used for remittances and payroll in Latin America.
- BitPay — Payment processor allowing merchants to accept Bitcoin/Lightning, settle in fiat.
- OpenNode — Stripe-like processing for Lightning payments, used by Shopify stores, news sites, and charities.
- Fold — Earn Bitcoin rewards on everyday purchases (Starbucks, Uber, Amazon) through Lightning.
- BTCPay Server — Open-source, self-hosted payment processor. No middleman. Popular with privacy-conscious merchants.
Where You Can Spend Bitcoin Today
- El Salvador — Thousands of businesses
- Switzerland — The town of Lugano accepts Bitcoin for taxes and services (via Plan ₿)
- Online — Thousands of Shopify stores via BitPay/OpenNode
- Gift cards — Bitrefill lets you buy gift cards for 1,700+ brands using Lightning
- VPNs, hosting, domains — ProtonVPN, Mullvad, Namecheap, and others
- Charities — Red Cross, UNICEF, The Water Project accept Bitcoin
Lightning Wallets: Your Options
To use Lightning, you need a Lightning wallet. Here are the most popular options for beginners:
Phoenix Wallet
Best for: General users who want a balance of convenience and self-custody
Phoenix is a non-custodial wallet (you control the keys) that manages Lightning channels automatically. It handles channel opening, closing, and liquidity in the background — you just send and receive like a regular wallet.
- Platform: iOS, Android
- Self-custodial: Yes (you hold the keys)
- Channel management: Automatic
- Fees: On-chain fees for opening/closing channels + routing fees
- Good for: Beginners who want real Lightning without manual channel babysitting
Muun Wallet
Best for: People who want one wallet for both on-chain and Lightning
Muun is unique — it handles on-chain and Lightning in a single wallet with automatic conversion. You can receive Lightning payments even if you’re offline later. It uses a clever protocol (Turbo Channels) to make receiving Lightning easy for beginners.
- Platform: iOS, Android
- Self-custodial: Yes
- Channel management: Automatic (Turbo Channels)
- Fees: Dynamic (uses Submarine Swaps internally)
- Good for: Absolute beginners who want one wallet for everything
Zeus Wallet
Best for: Users who already run their own Lightning node (advanced)
Zeus connects to your own LND (Lightning Network Daemon) node — either on your home server, a cloud VPS, or a device like Umbrel/Start9. It’s the most powerful and most technically demanding option.
- Platform: iOS, Android, Desktop
- Self-custodial: Yes (you run your own node)
- Channel management: Full manual control
- Good for: Power users, node operators
Other Notable Wallets
- Breez — Non-custodial, integrates podcasts and tipping
- Wallet of Satoshi — Custodial (simplest setup, but they control keys)
- Alby — Browser extension for Lightning on the web
- BlueWallet — Supports Lightning with LNDHub backend
Micropayments: The Revolutionary Use Case
Lightning unlocks something fundamentally new: micropayments. Because fees are near-zero, you can send amounts as small as one satoshi (0.00000001 BTC, currently ~$0.0007).
This wasn’t practical before Lightning. A 5 in fees. On Lightning, that same payment costs a fraction of a cent.
What Micropayments Enable
- Pay-per-second streaming — Watch a video and pay only for the seconds you actually watch
- Pay-per-article news — Read a single article for a few satoshis instead of buying a subscription
- API pricing — Pay for API calls by the request, not by the month
- Bandwidth sharing — Sell your unused WiFi by the kilobyte
- Tipping — Tip content creators with a single tap, no minimum
Streaming Money: Satoshis Per Second
The most futuristic concept enabled by Lightning is streaming money. Imagine a Bitcoin payment that doesn’t happen in a lump sum, but trickles continuously — like water from a tap.
The Satoshis Per Second (SPS) model allows you to:
- Stream audio with a payment of 10 sats/second
- Rent a VPN by the minute, automatically billed as you use it
- Pay for compute time on a cloud server by the microsecond
The Lightning Network’s infrastructure can handle these constant tiny updates because each one is just an update to the balance in an already-open channel, not a new transaction.
Real example: Podcasting 2.0 allows you to stream sats to podcasters as you listen. Apps like Breez, Fountain, and Castamatic integrate Lightning to send micropayments in real time — boosting creators per-second as you enjoy their content.
The Practical Steps: How to Make Your First Lightning Payment
Ready to try it? Here’s the simplest route:
- Install Phoenix Wallet (or Muun) from your app store
- Open the app — it will automatically create a channel (this takes a few minutes and costs a small on-chain fee)
- Deposit Bitcoin — send some BTC from your exchange or on-chain wallet to your Phoenix receiving address
- Find something to buy — try Bitrefill (gift cards) or visit a merchant that accepts Lightning
- Scan the merchant’s QR code — it looks like a regular payment QR, but Lightning invoices start with
lightning:orlnbc - Confirm — payment is instant, you’ll see the confirmation in under a second
Cost: a few satoshis in routing fees (literally pennies). Compare that to the $2-10 you’d pay for an on-chain transaction.
Things to Know Before You Start
Inbound Liquidity
To receive Lightning payments, someone needs to have a channel open to you with enough balance on their side. This is called inbound liquidity. It’s like needing room on your side of the bar tab for the bartender to write down your purchases.
Wallets like Phoenix and Muun handle this automatically. But if you’re running your own node, you’ll need to manage inbound liquidity — which is the main pain point for advanced users.
Channel Capacity
A channel can only carry as much value as was locked when it was opened. If you opened a channel with 0.1 BTC, you can’t send more than 0.1 BTC through it (though you can receive unlimited amounts if others route through you). Your wallet handles this for you, but it’s worth understanding.
Routing Failures
Not every payment route succeeds — sometimes a channel along the path runs out of capacity. Wallets retry automatically through different paths, but very large payments or payments to obscure recipients may fail.
Lightning Is Not Private Enough to Assume Anonymity
While Lightning offers better privacy than on-chain (routed payments are harder to trace), it’s not perfectly private. Advanced analysis can still link transactions. For serious privacy, combine Lightning with other techniques.
Summary: What You Need to Know
- On-chain Bitcoin is your settlement layer — slow, secure, and good for large amounts or long-term storage
- Lightning Network is your spending layer — instant, cheap, and good for daily transactions
- Bar tab analogy — open a channel (start a tab), transact freely, settle once
- Micropayments unlock entirely new use cases impossible with traditional finance
- Streaming money (satoshis per second) is the cutting edge — pay continuously for services in real time
- Lightning wallets like Phoenix and Muun make it easy — download, deposit, and spend
- Bitcoin as spendable cash is no longer theoretical. It works today.
The Lightning Network is to Bitcoin what TCP/IP was to the early internet — a protocol layer that turns a promising technology into something usable by everyone.
← Part 7: How to Store Bitcoin Safely | Part 9: Investing in Bitcoin →
Part 8 of the Bitcoin for Beginners series. Next: investing in Bitcoin — dollar-cost averaging, volatility, risk management, and the long-term perspective.