Bitcoin Lightning Network: what it is and how it works
The Lightning Network is a Bitcoin payment layer, not a separate coin. It moves bitcoin through payment channels for fast, low-cost payments.
Vahe HakobyanEditor-in-chief
Updated Oct 6, 20263 min readFact-checked
On this page
- Lightning spends bitcoin; it has no separate coin.
- It uses payment channels off the main chain.
- Payments settle fast and usually cost less.
Bitcoin's main chain can process only so many payments at once. Lightning adds a second layer for sending bitcoin off the main chain.
What is the Lightning Network?
The Lightning Network is a system built on top of Bitcoin. It is not a separate cryptocurrency or its own blockchain.
How do Lightning payments work?
Two users open a payment channel by locking bitcoin in a shared transaction on Bitcoin's main chain. They update the balance without writing each update to the blockchain, and the final balance settles on-chain when the channel closes.
How do people use it today?
Support for Lightning is not fixed. SegWit, a Bitcoin upgrade activated in August 2017, was intended to support the Lightning Network. Wallets, exchanges and the networks they use change over time.
- Paying merchants that accept bitcoin over Lightning.
- Sending small tips or payments to friends.
- Moving bitcoin between services that support Lightning.
What are the risks and limits?
Lightning adds failure points. A payment can fail if the route lacks enough balance, which is called liquidity. A Lightning wallet often stays online and may hold keys on a connected device.
- Channel liquidity: a route may not carry enough bitcoin.
- Online custody: a connected wallet can be lost or drained.
- Fewer protections: payments are usually irreversible.
What US rules apply to Lightning?
The IRS treats bitcoin as property, so Lightning payments can have tax results. Buying bitcoin with US dollars is not taxable, but paying with bitcoin or trading one crypto for another can trigger capital gains or losses. Businesses that send bitcoin for customers can face federal and state money-transmission rules.
Bitcoin price todayLive price, charts and market data live in our Coins section.Frequently asked questions
No. Lightning uses bitcoin and has no separate coin. You need a wallet that supports Lightning, not a new cryptocurrency.
Yes. If your device or wallet is unavailable and you lack a working backup, channel funds may be lost or stuck.
No. The Bitcoin blockchain records final transactions, while Lightning is a layer built on top of it. Lightning settles to the blockchain when channels close.
Support changes over time, so there is no fixed list. Check a wallet's current features before you rely on it. Some exchanges and wallets have added or removed Lightning support since August 2017.
