Technology
What Is the Lightning Network?
The Lightning Network is a second layer on top of Bitcoin built for fast, small payments. Here is how payment channels work and where the trade-offs are.
Topic
Lightning
The Lightning Network explained: a payment layer on top of Bitcoin for fast, low-value payments, and the trade-offs that come with it.
The Lightning Network is a payment layer built on top of Bitcoin for quick, low-value payments. Two people open a payment channel, update their balances off-chain, and only the opening and closing are recorded on the blockchain. What Is the Lightning Network? explains payment channels, routing and the trade-offs in plain terms.
Lightning is not a separate coin; it moves bitcoin. The guide reads best after How Does Bitcoin Work?, because Lightning depends on the base layer. The article is candid about liquidity limits, custody choices and added complexity, and it notes that apps and fees change quickly, so anything you read about specific wallets should be checked against current sources. More background is in the Technology category, and Start Here lays out the basics in order.
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Frequently asked questions about Lightning
What is the Lightning Network in simple terms?
The Lightning Network is a payment layer on top of Bitcoin that lets people make fast, low-cost payments by updating balances off-chain. Think of the blockchain as the final court record and Lightning as a running tab settled up later. It is not a separate coin, it moves bitcoin. See What Is the Lightning Network?.
How do Lightning payment channels work?
Two people lock bitcoin into a shared wallet that needs both signatures, which is an ordinary on-chain transaction. Each payment is then a newly signed balance sheet exchanged off-chain, and the final one is broadcast to close the channel. Penalty mechanisms discourage cheating with old balances. See the Lightning guide.
Do I need a direct channel with the person I want to pay?
No, payments can hop across connected channels, so you can pay someone through intermediary nodes. Each hop only receives its funds if the next hop is paid, and intermediaries may charge a small routing fee. Large payments can fail if no route has enough liquidity. See What Is the Lightning Network?.
What are the risks of using Lightning?
Lightning has real trade-offs: limited channel liquidity, the need for your node or a service to watch the chain, and hot wallet risk because funds sit in internet-connected software. Custodial Lightning wallets add counterparty risk, much like an exchange. Keeping only spending-sized amounts there is the sensible approach. See the Lightning guide.
Should I keep my long-term savings on Lightning?
Generally no, because Lightning is better suited to small, fast payments than to large long-term balances. Channel funds live in software connected to the internet, and closing channels costs on-chain fees. Most people focused on long-term holdings keep them on-chain in their own wallet. See What Is the Lightning Network? and consider a professional's advice.
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