Bitcoin produces a block on average every 10 minutes, and on-chain space is limited, making it inconvenient for buying a cup of coffee. The idea behind the Lightning Network is that most small payments don’t need to be recorded on-chain individually. They can be settled quickly off-chain, with only the opening and closing transactions recorded on-chain.

The Lightning Network also uses $BTC , but most payments don’t need to be recorded on-chain individually. Current price: 78,060.01 (24h +0.6%).

— How to open a payment channel —

The Lightning Network white paper was proposed by Joseph Poon and Thaddeus Dryja in 2015. Its basic unit is the payment channel: two users first lock bitcoin into a 2-of-2 multisig address jointly controlled by both parties using an on-chain transaction, and the channel is open.

After that, each payment between the two parties is simply an exchange of a newly signed balance record. There’s no need to put it on-chain, and payments are almost instant. When the channel is closed, the latest balance is settled back to the Bitcoin main chain in an on-chain transaction.

— How to pay without a direct channel —

You don’t necessarily need a channel with the recipient. You can make a payment along a path formed by connecting other nodes. Each hop along the path is locked using a hash time-locked contract (HTLC): the funds are released hop by hop only when the recipient provides the correct “secret.” If it times out, the funds are returned along the original route, so intermediate nodes can’t keep the money. Nodes along the route may charge a small routing fee.

— How cheating is prevented —

If one party tries to close the channel using an old balance record—for example, one showing that they had more money—the other party can submit a penalty transaction within a specified time and claim all the funds in the channel. This makes cheating unprofitable, provided the victimized party detects it in time. That’s why nodes need to stay online or delegate monitoring to a watchtower service.

Segregated Witness also fixed the transaction malleability problem, one of the key prerequisites for the Lightning Network to operate securely.

— Limitations and things to keep in mind —

How much you can pay through a channel depends on how the balance is distributed between its two sides. Large payments may fail if no route has enough capacity. Opening and closing a channel also incur on-chain fees.

When depositing to an exchange, make sure you select either on-chain or Lightning Network, as the two use different receiving formats. Lightning wallets are better suited to everyday small payments, while bitcoin held long term is safer in an on-chain wallet where you control the private keys.

— In closing —

The Lightning Network doesn’t change Bitcoin itself. It adds a fast lane on top of it: small, frequent payments go through channels, while large, long-term settlements stay on the main chain. Don’t trade with borrowed money; it can cloud your judgment and lead to bad decisions.

If you found this useful, save it to look at again later.