Bitcoin Lightning Network Explained

You want to pay for a coffee with an on-chain Bitcoin transaction. The merchant shows a payment request, you scan it and send. Then you wait for confirmation. It might arrive quickly, or the wait might outlast the coffee. Bitcoin targets an average of ten minutes between blocks; that is not a minimum or a promised confirmation time.

On-chain fees depend on transaction size and competition for block space. During congestion, the fee can rival the price of a coffee. During quiet periods, it can be much lower. The case for Lightning is fast payment completion and sharing on-chain costs across many payments, even when the base layer is cheap.

Bitcoin's base layer was built for something else: secure, final, irreversible settlement. Think international wire transfer, not tap-and-go. That is the correct trade-off for a layer that anchors billions of dollars of value with no single point of failure.

You also need small, fast, cheap payments. The Lightning Network exists to deliver them. It runs on top of Bitcoin and can complete payments in seconds. Costs depend on the route and wallet, including any service or liquidity fees. Same Bitcoin. No new coin. No separate blockchain is required by Lightning itself.

How Lightning Actually Works

The building block of Lightning is the payment channel. The idea is simpler than the name.

Picture two people, Lena and Marco, who pay each other often. Instead of writing every payment to the blockchain, they open a payment channel secured by both their signatures. One or both can supply its Bitcoin funding. The opening transaction goes on-chain.

After that, they transact privately. Every payment updates a signed record of who owns which share of the channel funds. Those balance updates do not need a new on-chain transaction or a miner fee.

When they agree to close the channel, one closing transaction pays out the final balances on-chain. An uncomplicated channel can therefore serve many payments with just an opening and a cooperative closing transaction. Splicing or a disputed closure can require more on-chain transactions. Lightning Labs describes the channel lifecycle.

If one party publishes a revoked, older balance, the other can claim the offending party's channel funds as a penalty. That protection requires detecting the attempt and responding within the channel's time limit. Your node, or a watchtower acting on its behalf, must monitor the chain. Cryptography supplies the enforcement mechanism; reliable monitoring and backups remain part of the security model.

This works for two people who transact often. You do not have a channel with every coffee shop in Zurich. Lightning fixes this with routing.

If Lena wants to pay a café she has never visited, her wallet finds a path through connected channels. Hash Time-Lock Contracts (HTLCs) link the hops: forwarding nodes obtain the secret needed to claim their incoming funds when the recipient accepts the payment. Timeouts provide a way to recover funds if the payment does not complete. A payment can nevertheless stay pending while a timeout or on-chain resolution runs its course. Wait for the wallet's final status before retrying a pending payment. Lightning Labs explains these payment states.

From your side, a successful payment can be simple: scan a QR code, check the amount and fee, and confirm. Completion often takes seconds, but routing, connectivity and liquidity can cause delays or failures.

The Network in Numbers

Lightning is not a concept under development. It is a live network moving real payments around the world.

The mempool.space Lightning API, checked on 13 September 2026, returned a snapshot dated 30 August 2026 at 00:00 UTC: 16,242 nodes, 32,678 channels and about 3,795 BTC of capacity. These are public-graph observations at a point in time, not September totals, payment volume or a count of users. Private channels are outside this measurement. Explorers also differ in which nodes and channels they count; compare observations from the same source and date.

A routing fee can include both a base charge and a charge proportional to the amount forwarded, at each hop. A median advertised base fee is therefore not the median total fee paid by a user. Wallet service charges, swaps and channel funding can add further costs. Check the complete quote before confirming. Lightning Labs explains the routing-fee components.

Large, well-connected nodes can provide useful routes, but public connectivity does not reveal how much payment traffic each node carries. A wallet can try another path when a node is offline, provided a suitable route and enough liquidity exist. Dependence on a particular wallet provider can still interrupt your payments even when the wider network is working.

What You Can Do With Lightning Right Now

Lightning delivers what Bitcoin's base layer cannot: everyday spending.

If you are buying something small (a coffee, a meal, a piece of software, a tip to a creator), Lightning can make checkout quick. Merchants accept it through a compatible wallet, payment processor or point-of-sale. You scan their payment request and check the quote before sending.

Cross-border payments use the same routing mechanism as local ones. The Lightning transfer itself can be quick and inexpensive, but the total cost also includes buying Bitcoin, wallet charges, currency conversion and any cash-out service. Compare how much local currency the recipient actually receives and when they can use it. A global payment network does not make every provider's account or bank payout available in every country.

Lightning also plugs into Nostr, a decentralized social protocol. Users can send creators small Bitcoin tips called "Zaps" through compatible clients and payment providers. Minimum amounts and fees depend on those services.

A Lightning Address makes some payments easier. It looks like an email address, for example satoshi@walletofsatoshi.com. A compatible wallet uses it to request payment details from the provider. It is a payment identifier, not an ordinary email inbox, and receiving still depends on the wallet and provider supporting the request. Wallet of Satoshi explains its Lightning Addresses.

Which Wallet to Use in Switzerland

Choosing a Lightning wallet comes down to one decision first. Do you want to hold your own keys, or do you want someone else to manage them for you?

Custodial wallets, where the provider controls the underlying keys, are simpler to use but reintroduce the same counterparty risk you adopted Bitcoin to avoid. Your balance lives as a row in their database. They can freeze it. The company can fail. Regulations can lock you out. Custodial Lightning wallets are fine for very small amounts and for getting started. They are not appropriate for meaningful savings.

Self-custodial wallets keep you in control. The trade-off used to be that managing Lightning channels was technically demanding. Modern wallets have stripped most of that complexity out.

Wallet details below were checked on 13 September 2026. Download availability, account eligibility and access to a particular feature are separate questions. Use the provider's official download links and check the terms for your region.

Phoenix, built by ACINQ, runs a Lightning node on your phone and automatically manages channel capacity through splicing. Its current fee table lists 0.4% plus 4 sats for Lightning sends, 1% plus mining fees for Lightning receipts requiring more liquidity, and 1,000 sats for channel creation. Receiving with enough liquidity has no fee. Its Swiss iOS listing is available, and ACINQ also provides Android downloads. The terms include country restrictions, so availability is not universal. Self-custody also leaves operational dependencies: ACINQ routes payments and can see their amounts and destinations, as its trust and privacy FAQ explains.

Muun presents one balance for Bitcoin and Lightning payments. Its submarine swaps connect on-chain funds to Lightning, so on-chain conditions can affect costs even when you pay a Lightning invoice. Muun co-signs ordinary transactions in its 2-of-2 setup; this service dependency is different from giving the provider sole custody. For independent recovery, keep both the Emergency Kit and Recovery Code, which together recover the keys and spending information. A conventional seed phrase alone is not Muun's recovery method. Muun supplies iOS and Android apps, including a Swiss iOS listing. Compare the payment quote with a native Lightning wallet if you plan frequent small payments.

Wallet of Satoshi now has different custody modes. Its disclosure dated 25 August 2026 describes Spark-based self-custody as globally available and custodial service as region-dependent. In custodial mode, the company holds the keys. In Spark mode, you control recovery keys, while transfers and exits depend on Spark's protocol and infrastructure. The 12-word recovery phrase requires compatible Spark recovery software; importing it into an ordinary Bitcoin wallet does not recreate the balance. Check the mode shown in your app and follow the official migration instructions when moving an existing custodial balance.

Zeus supports connecting to a remote Lightning node and running a node on the phone. Its embedded node can obtain channels through a Lightning service provider or open them manually. It offers more control over channels and peers, which also means understanding the selected wallet mode, backups and liquidity costs.

Strike requires an eligible account. Its business-country list explicitly includes Switzerland. The personal-account availability FAQ describes eligible European users without confirming Swiss personal-account eligibility country by country. Check that eligibility with Strike before relying on a personal account; a business listing is insufficient evidence. The ability to send Bitcoin or Lightning payments globally does not establish account availability everywhere, and bank funding, cash balances and payout features vary by region. Strike also moved its European entity to Malta in June 2026.

Breez develops payment infrastructure and still publishes wallet software. Its Misty Breez app, introduced in April 2025 for Android and iOS, is a reference application for its SDK. The Liquid SDK documentation identifies Misty Breez as its reference wallet. That implementation holds L-BTC on Liquid and swaps into or out of Lightning. Breez now recommends its Spark SDK for new integrations. Check which product you are installing: these systems have different asset, fee and recovery assumptions from Phoenix's native Lightning channels.

What Lightning Cannot Do

Lightning has real limitations you should know.

Routing does not always succeed. A payment needs enough spendable liquidity along a suitable path; wallets can sometimes split it across several paths. Larger amounts can be harder to route, but there is no universal CHF cutoff. Compare the wallet's quote and available route with an on-chain transfer for the amount you need to move.

Liquidity is the hidden variable. Sending requires outbound capacity, and receiving requires inbound capacity. Wallets such as Phoenix automate this management, but extra capacity can involve provider charges as well as mining fees. A fee limit can cause an incoming payment to be rejected instead of expanding a channel at an unacceptable cost.

Lightning payments are not all recorded on a public blockchain, but that does not make them anonymous. Public channel announcements reveal connectivity, channel partners know the balance of their shared channel, and wallet providers may learn payment details. Phoenix, for example, says ACINQ can see payment destinations and amounts in its privacy FAQ.

Tor can hide a node's network address without hiding every aspect of its Lightning activity. The 1ML statistics page, checked on 13 September 2026, listed 2,854 Tor onion-service nodes and 5,899 nodes in its main count. Those are that explorer's observations, not a census of all wallets or private channels; its percentage-change columns compare the preceding 30 days. The page supplies no precise observation timestamp, so these figures should not be combined with the dated mempool snapshot above.

Lightning and Swiss Tax

Using Lightning does not by itself change the distinction between private investment gains and earned income. The ESTV cryptocurrency guidance, checked on 16 September 2026, generally exempts gains on privately held payment tokens, while business gains and earnings paid in Bitcoin can be taxable. Bitcoin holdings also belong in the year-end wealth declaration; a Lightning balance is not exempt merely because it is off-chain.

Keep CHF records of commercial payments received over Lightning. Selling personal possessions is not automatically the same as earning business revenue; chapter 15 explains the private-investor and business distinction.

Routing fees compensate a service, rather than a rise in the value of Bitcoin you already own. Applying the general income-tax framework, do not assume those fees qualify for the private capital-gains exemption. This is an application of the general rules, not a claim that the ESTV has issued a Lightning-specific ruling. A Swiss tax adviser or your cantonal authority can clarify the classification, deductible expenses and reporting for your node activity.

To find Lightning-accepting merchants near you in Switzerland, btcmap.org maintains a live, community-updated map of physical businesses that accept Bitcoin and Lightning across the country. The count moves often. Check there rather than any static number this chapter could quote.

Your First Lightning Payment

The most useful thing you can do after reading this chapter is make a real Lightning payment. The concepts land harder once you have felt how different it is from an on-chain transaction.

Choose a wallet after reading its fee and recovery instructions. Set up its backup before funding it with an amount you can afford to lose. Allow for any channel creation or swap costs; the amount sent to the wallet may not all become spendable immediately.

For a test, generate a Lightning invoice in a second wallet you control, or use a Lightning-enabled merchant found through BTC Map. Scan the request with the paying wallet, confirm the amount and full fee, then check both wallets for successful completion. A Lightning Address is optional and must be supported by the receiving provider.

Setup can take longer than the payment itself. Once the wallet is funded and has the required liquidity, a successful Lightning payment can feel much like a contactless card tap.

Chapter Summary

• On-chain fees depend on transaction size and demand for block space. Check mempool.space and the wallet's quote before sending. Ten minutes is the target average block interval, not a minimum confirmation time.

• Lightning uses payment channels to make repeated off-chain payments, with on-chain transactions for funding, resizing or closing channels. Lightning itself creates no new coin.

• Payments can complete in seconds. Fees, routing failures and pending payments remain possible; check the final status before retrying.

• Compare wallet custody, recovery and total costs. Phoenix automates channels; Muun uses swaps and an Emergency Kit; Wallet of Satoshi has Spark self-custody and region-dependent custodial modes. Strike lists Switzerland for business accounts, while the reviewed FAQ does not establish Swiss personal-account eligibility.

• Larger payments can be harder to route. Compare Lightning liquidity and fees with the on-chain option for your transfer.

• Swiss tax treatment is unchanged. Capital gains on Bitcoin held as private assets remain tax-free, whether transacted on Lightning or on-chain. Routing fees from running a node sit in a grey area. Take professional advice if that applies to you.