Lightning Network
The Lightning Network is a layer-2 payment network built on Bitcoin. Users open payment channels anchored on the blockchain and then send bitcoin through them almost instantly and at very low cost, settling on-chain only when channels open or close.
Bitcoin's base layer adds a block about every ten minutes, and fees rise when it's busy — fine for large transfers, awkward for buying a coffee. The Lightning Network moves most payments off the main chain into a web of payment channels. This entry explains how channels work, why payments are fast and cheap, and the trade-offs.
- Category
- Cryptocurrency and Blockchain
- Reading time
- 3 min
- Also called
- Bitcoin Lightning Network, Lightning, LN
- Updated
Lightning in plain words
The Lightning Network is a peer-to-peer payment network that uses payment channels anchored on the Bitcoin blockchain for near-instant, low-cost bitcoin payments.1
Channels are chained together so payments can reach anyone in the network without trusting the participants in between.1
Because transactions are settled off the blockchain, fees can be very low, enabling uses such as instant micropayments.2
How a Lightning payment works, step by step
Open a channel
Lock bitcoin in an on-chain transaction. See Blockchain.
Both sides sign
Spending needs both parties' approval. See Multisig Wallet.
Create an invoice
The recipient sets the amount.
Route the payment
Through connected channels.
Balances update off-chain
No new block needed.
Close when done
Final balances settle on-chain.
Worked examples
Example 1 — Fees compared
Micropayments workSending $5 worth of bitcoin. On-chain fee $2; Lightning fee $0.002.
| On-chain fee share | $2 ÷ $5 = 40% |
| Lightning fee share | $0.002 ÷ $5 = 0.04% |
Settling off-chain allows exceptionally low fees, which makes small payments practical.2
Example 2 — Channel balance
3 payments, 0 blocksAlice opens a channel with 0.01 BTC and pays Bob 0.002 BTC three times.
| Alice's balance | 0.01 − 3 × 0.002 = 0.004 BTC |
| Bob's balance | 0.006 BTC |
Payments update the channel's balance off-chain; only opening and closing touch the blockchain.1
Example 3 — Routing
Trustless routingAlice has a channel to Carol, and Carol to Dave. Alice pays Dave without a direct channel.
| Route | Alice → Carol → Dave |
| Trust in Carol needed? | No |
Chained channels deliver payments across the network without requiring trust in intermediaries.1
Lightning vs on-chain bitcoin
| Aspect | Lightning | On-chain |
|---|---|---|
| Speed | Near instant | About 10 minutes per block |
| Fees | Very low | Varies, can be high |
| Best for | Small, frequent payments | Large, final settlement |
| See also | Payment channels | Block Time and Block Height |
What Lightning is used for
Everyday payments
Paying merchants in bitcoin. See Paying with Crypto.
Micropayments
Tiny payments for content or services.
Exchange transfers
Moving bitcoin cheaply between platforms.
Cross-border transfers
Low-cost international payments.
Advantages and disadvantages
Advantages
- Near-instant payments.
- Very low fees.
- Reduces load on the main chain.
Disadvantages
- Channels need liquidity to route payments.
- Usually requires an online wallet.
- More complex than on-chain transfers.
Going deeper
Read as far as you need. Each level builds on the one before it.
Layer 2
Beginner
Lightning depends on the underlying blockchain for security; it adds a faster payment layer on top. See Layer 1 and Layer 2.
Bidirectional channels
Intermediate
Two participants create a ledger entry on the blockchain that requires both to sign off on spending the funds.2
Cross-chain swaps
Advanced
Lightning can support atomic swaps across blockchains that share the same hash function, without trusting custodians.2
Common mistakes
Expecting it for huge transfers
Large payments may fail to route.
Ignoring channel liquidity
You can only send what your channels hold.
Using custodial wallets unknowingly
Check who controls the keys. See Custodial Wallet and Self-Custody.
Confusing it with a separate coin
It moves real bitcoin.
Check your understanding
Test yourself before moving on. Each answer comes with an explanation.
Key points to remember
- Lightning is a layer-2 payment network for bitcoin.
- It uses payment channels anchored on the blockchain.
- Payments are near instant with tiny fees.
- Channels route payments without trusting intermediaries.
- It suits small, frequent payments best.
Frequently asked questions
Is Lightning a different cryptocurrency?
Is Lightning safe?
Do I need to run a node?
Further learning
- Layer 1 and Layer 2
Where Lightning fits.
- Bitcoin (BTC)
The base network.
- Crypto Wallet
Wallets that support Lightning.
Sources
This article is written in our own words. The sources below support the specific facts, rules and figures marked with a number in the text. Links open the original publisher’s page.
- Lightning Labs. The Lightning Network: Overview (opens in a new tab) Checked .
- Lightning Network. Lightning Network: Scalable, Instant Bitcoin/Blockchain Transactions (opens in a new tab) Checked .
Educational content, not financial advice. Examples use hypothetical prices and simplified costs; actual fees, margin rules and regulations vary by broker, market and country. We are not affiliated with any publisher linked above. Last reviewed . Report an error or request a source credit.