In this chapter, we will start where most people start when encountering the Lightning Network for the first time - choosing software. We will examine the choices of two users who represent a common use-case for the Lightning Network and learn by example. Alice, a coffee shop customer, will be using a LN wallet on her mobile device to buy coffee from Bob's Cafe. Bob, a merchant, will be using a LN node and wallet to run a point-of-sale system at his cafe so he can accept payment over the Lightning Network.
In this chapter, we will begin where most people start when encountering the Lightning Network for the first time - choosing software. We will examine the choices of two users who represent a common use-case for the Lightning Network and learn by example. Alice, a coffee shop customer, will be using a LN wallet on her mobile device to buy coffee from Bob's Cafe. Bob, a merchant, will be using a LN node and wallet to run a point-of-sale system at his cafe so he can accept payment over the Lightning Network.
=== Lightning Nodes
@ -68,11 +68,11 @@ In <<lnwallet-examples>> we see some examples of currently popular LN node and w
=== Balancing complexity and control
Lightning wallets have to strike a careful balance between complexity and user control. Those that give the user the most control over their funds, the highest degree of privacy and the greatest independence from third party services are necessarily more complex and difficult to operate. As the technology advances, some of these trade-offs will become less stark and users may be able to get more control without more complexity. However, for now, different companies and projects are exploring different positions along this control-complexity spectrum and hoping to find the "sweet spot" for the users they are targeting.
Lightning wallets have to strike a careful balance between complexity and user control. Those that give the user the most control over their funds, the highest degree of privacy, and the greatest independence from third party services are necessarily more complex and difficult to operate. As the technology advances, some of these trade-offs will become less stark, and users may be able to get more control without more complexity. However, for now, different companies and projects are exploring different positions along this control-complexity spectrum and hoping to find the "sweet spot" for the users they are targeting.
When selecting a wallet keep in mind that even if you don't see these trade-offs they still exist. For example, many wallets are attempting to remove the burden of channel management from users. To do so, they are introducing central "hub" nodes that their wallets all connect to automatically. While this trade-off simplifies the user interface and user experience, it introduces a Single Point of Failure (SPoF) and a potential privacy compromise, as these "hub nodes" become both indispensable and can see all the user's transactions.
When selecting a wallet, keep in mind that even if you don't see these trade-offs, they still exist. For example, many wallets will attempt to remove the burden of channel management from its users. To do so, they introduce central "hub" nodes that their wallets all connect to automatically. While this trade-off simplifies the user interface and user experience, it introduces a Single Point of Failure (SPoF) and a potential privacy compromise, as these "hub nodes" become indispensable and can see all the user's transactions.
In the next section we will introduce our first user and walk through their first LN wallet setup. We have chosen a wallet that not the easier to use custodial wallet model. This is because we want to show some of the underlying complexity and introduce some of the inner workings of the wallet during our example. You may find that your first ideal wallet is further towards "ease of use", by accepting some of the control and privacy trade-offs. Or perhaps you are more of a "power user" and want to run your own LN and Bitcoin nodes as part of your wallet solution.
In the next section, we will introduce our first user and walk through their first LN wallet setup. We have chosen a wallet that is more sophisticated than the easier custodial wallets. This is because we want to show some of the underlying complexity and introduce some of the inner workings of the wallet during our example. You may find that your first ideal wallet is further towards "ease of use", by accepting some of the control and privacy trade-offs. Or perhaps you are more of a "power user" and want to run your own LN and Bitcoin nodes as part of your wallet solution.
=== Alice's First LN Wallet
@ -84,9 +84,9 @@ Alice does not want to entrust custody of her bitcoin to third parties. She has
When looking for a new cryptocurrency wallet, you must be very careful to select a secure source for the software.
Unfortunately, there are many fake wallet applications that will steal your money, and some of these even find their way onto reputable and supposedly vetted software sites, like the Apple and Google application stores. Whether you are installing your first or your tenth wallet, always exercise extreme caution. A rogue app can not only steal money any money you entrust it with, it might also be able to steal keys and passwords from other applications by compromising your mobile device operating system.
Unfortunately, many fake wallet applications will steal your money, and some of these even find their way onto reputable and supposedly vetted software sites, like the Apple and Google application stores. Whether you are installing your first or your tenth wallet, always exercise extreme caution. A rogue app can not only steal money any money you entrust it with, it might also be able to steal keys and passwords from other applications by compromising your mobile device operating system.
Alice uses an Android device, and will use the Google Play Store to download and install the Eclair wallet. Searching on Google Play, she finds an entry for "Eclair Mobile", as shown in <<eclair-playstore>>.
Alice uses an Android device and will use the Google Play Store to download and install the Eclair wallet. Searching on Google Play, she finds an entry for "Eclair Mobile", as shown in <<eclair-playstore>>.
[[eclair-playstore]]
.Eclair Mobile in the Google Play Store
@ -105,16 +105,16 @@ When Alice opens the Eclair Mobile app for the first time, she is presented with
==== Responsibility with Key Custody
As we mentioned in the beginning of this section, Eclair is a _non-custodial_ wallet, meaning that Alice has sole custody of the keys used to control her bitcoin. This also means that Alice is responsible for protecting and backing up those keys. If Alice loses the keys, no one can help her recover the bitcoin and it will be lost forever.
As we mentioned in the beginning of this section, Eclair is a _non-custodial_ wallet, meaning that Alice has sole custody of the keys used to control her bitcoin. This also means that Alice is responsible for protecting and backing up those keys. If Alice loses the keys, no one can help her recover the bitcoin, and it will be lost forever.
[WARNING]
====
With the Eclair Mobile wallet, Alice has custody and control of the keys and therefore full responsibility to keep the keys safe and backed up. If she loses the keys, she loses the bitcoin and no one can help her recover from that loss!
With the Eclair Mobile wallet, Alice has custody and control of the keys and, therefore, full responsibility to keep the keys safe and backed up. If she loses the keys, she loses the bitcoin, and no one can help her recover from that loss!
====
==== Mnemonic Words
Similar to most Bitcoin wallets, Eclair Mobile provides a _mnemonic phrase_ for Alice to back up. The mnemonic phrase consists of 24 English words, selected randomly by the software, and used as the basis for the keys that are generated by the wallet. The mnemonic phrase can be used by Alice to restore all the transactions and funds in the Eclair Mobile wallet in the case of a loss, for example because of a lost mobile device, software bug, or memory corruption.
Similar to most Bitcoin wallets, Eclair Mobile provides a _mnemonic phrase_ for Alice to back up. The mnemonic phrase consists of 24 English words, selected randomly by the software, and used as the basis for the keys that are generated by the wallet. The mnemonic phrase can be used by Alice to restore all the transactions and funds in the Eclair Mobile wallet in the case of a loss, for example, because of a lost mobile device, software bug, or memory corruption.
[TIP]
====
@ -127,23 +127,23 @@ When Alice chooses to "Create a New Wallet", she will be shown a screen with her
In <<eclair-mnemonic>> we have purposely obscured part of the mnemonic phrase to prevent readers of this book from reusing the mnemonic.
In <<eclair-mnemonic>>, we have purposely obscured part of the mnemonic phrase to prevent readers of this book from reusing the mnemonic.
[[mnemonic-storage]]
==== Storing the Mnemonic Safely
Alice needs to be careful to store the mnemonic phrase in a way that balances the need to prevent theft and accidental loss. The recommended way to properly balance these risks is to write two copies of the mnemonic phrase on paper, with each of the words numbered (the order matters!).
Once Alice has recorded the mnemonic phrase, after touching "OK GOT IT" on her screen she will be presented with a _quiz_ to make sure that she correctly recorded the mnemonic. The quiz will ask for three or four of the words at random. Alice wasn't expecting a quiz, but since she recorded the mnemonic correctly she passes without any difficulty.
Once Alice has recorded the mnemonic phrase, after touching "OK GOT IT" on her screen, she will be presented with a _quiz_ to make sure that she correctly recorded the mnemonic. The quiz will ask for three or four of the words at random. Alice wasn't expecting a quiz, but since she recorded the mnemonic correctly, she passes without any difficulty.
Once Alice has recorded the mnemonic phrase, and passed the quiz, she should store each copy in a separate secure location such as a locked desk drawer, or a fireproof safe.
Once Alice has recorded the mnemonic phrase and passed the quiz, she should store each copy in a separate secure location such as a locked desk drawer, or a fireproof safe.
[WARNING]
====
Never attempt a "DIY" security scheme that deviates in any way from the best practice recommendation in <<mnemonic-storage>>. Do not cut your mnemonic in half, make screenshots, store on USB drives or cloud drives, encrypt it, or try any other non-standard method. You will tip the balance in such a way as to risk permanent loss or theft. Many people have lost funds, not from theft, but because they tried a non-standard solution without having the expertise to balance the risks involved. The best practice recommendation is carefully balanced by experts and suitable for the vast majority of users.
====
After Alice initializes her Eclair Mobile wallet, she will see a brief tutorial which highlights the various elements of the user interface. We won't replicate the tutorial here, but we will explore all of those elements as we follow Alice's attempt to buy a cup of coffee!
After Alice initializes her Eclair Mobile wallet, she will see a brief tutorial that highlights the various elements of the user interface. We won't replicate the tutorial here, but we will explore all of those elements as we follow Alice's attempt to buy a cup of coffee!
=== Loading Bitcoin Into the Wallet
@ -154,13 +154,13 @@ Alice now has an LN wallet. But, it's empty! She now faces one of the more chall
There are several ways Alice can acquire bitcoin:
* She can exchange some of her national currency (eg. USD) at a crypto-currency exchange
* She can exchange some of her national currency (e.g. USD) at a crypto-currency exchange
* She can buy some from a friend, or an acquaintance from a Bitcoin Meetup, in exchange for cash
* She can find a _Bitcoin ATM_ in her area, which acts as a vending machine, selling bitcoin for cash
* She can offer her skills or a product she sells and accept payment in bitcoin
* She can ask her employer or clients to pay her in bitcoin
All of these methods have varying degrees of difficulty and many will involve paying a fee. Some will also require Alice to provide identification documents to comply with local banking regulations. However, with all these methods, Alice will be able to receive bitcoin directly into her Eclair wallet.
All of these methods have varying degrees of difficulty, and many will involve paying a fee. Some will also require Alice to provide identification documents to comply with local banking regulations. However, with all these methods, Alice will be able to receive bitcoin directly into her Eclair wallet.
==== Receiving Bitcoin
@ -172,7 +172,7 @@ image:images/bitcoin-atm.png[]
To receive the bitcoin in her Eclair LN wallet, Alice will need to present a _Bitcoin Address_ from the Eclair LN wallet to the ATM. The ATM can then send Alice's newly acquired bitcoin to this bitcoin address.
On the Eclair wallet, to see a Bitcoin Address Alice must swipe to the left column titled "YOUR BITCOIN ADDRESS" (see <<eclair-receive>>), where she will see a square bardcode (called a _QR code_) and a string of letters and numbers below.
To see a Bitcoin Address on the Eclair wallet, Alice must swipe to the left column titled "YOUR BITCOIN ADDRESS" (see <<eclair-receive>>), where she will see a square bardcode (called a _QR code_) and a string of letters and numbers below.
[[eclair-receive]]
.Alice's bitcoin address, shown in Eclair
@ -188,44 +188,44 @@ Both Bitcoin addresses and QR codes contain error detection information that pre
Alice can take her mobile device to the ATM and show it to the built-in camera, as shown in <<bitcoin-atm-receive>>. After inserting some cash into the slot, she will receive bitcoin in Eclair!
[[bitcoin-atm-receive]]
.Bitcoin ATM scans the QR code
.Bitcoin ATM scans the QR code.
image:images/bitcoin-atm-receive.png[]
Alice will see the transaction from the ATM in the "TRANSACTION HISTORY" tab of the Eclair wallet. While the bitcoin transaction will be detected by Eclair in just a few seconds, it will take approximately one hour for the bitcoin transaction to be "confirmed" on the Bitcoin Blockchain. As you can see in <<eclair-tx1>>, Alice's Eclair wallet shows "6+ conf" below the transaction, indicating that the transaction has received the required six confirmations and her funds are ready to use.
Alice will see the transaction from the ATM in the "TRANSACTION HISTORY" tab of the Eclair wallet. While Eclair will detect the bitcoin transaction in just a few seconds, it will take approximately one hour for the bitcoin transaction to be "confirmed" on the Bitcoin Blockchain. As you can see in <<eclair-tx1>>, Alice's Eclair wallet shows "6+ conf" below the transaction, indicating that the transaction has received the required six confirmations, and her funds are ready to use.
[[eclair-tx1]]
.Alice receives bitcoin
image:images/eclair-tx1-btc.png[]
While in this example Alice used an ATM to acquire her first bitcoin, the same basic concepts would apply even if she used one of the other methods in <<acquiring-bitcoin>>. For example, if Alice wanted to sell a product or provide a professional service in exchange for bitcoin, her customers could scan the Bitcoin Address with their own wallets and pay her in bitcoin.
While in this example Alice used an ATM to acquire her first bitcoin, the same basic concepts would apply even if she used one of the other methods in <<acquiring-bitcoin>>. For example, if Alice wanted to sell a product or provide a professional service in exchange for bitcoin, her customers could scan the Bitcoin Address with their wallets and pay her in bitcoin.
Similarly, if she billed a client for a service offered over the Internet, Alice could send an email or instant message with the Bitcoin Address or the QR code (or both) to her client and they could scan or paste the information into a Bitcoin wallet to pay her.
Similarly, if she billed a client for a service offered over the Internet, Alice could send an email or instant message with the Bitcoin Address or the QR code to her client, and they could paste or scan the information into a Bitcoin wallet to pay her.
Alice could even print the QR code and affix it to a sign and display it to receive tips. A singer who receives bitcoin tips has a QR code printed and affixed to their guitar while performing!
Alice could even print the QR code and affix it to a sign and display it to receive tips. For example, she could have a QR code affixed to her guitar and receive tips while performing!
Finally, if Alice bought bitcoin from a crypto-currency exchange, she could (and should!) then "withdraw" the bitcoin by pasting her Bitcoin Address into the exchange website. The exchange will then send the bitcoin to her address directly.
=== From Bitcoin to Lightning Network
Alice's bitcoin is now controlled by her Eclair wallet and has been recorded on the Bitcoin Blockchain. At this point, Alice's bitcoin is "on-chain", meaning that she has completed a regular Bitcoin transaction, broadcast to the entire Bitcoin network, verified by all Bitcoin nodes and "mined" (recorded) onto the Bitcoin blockchain.
Alice's bitcoin is now controlled by her Eclair wallet and has been recorded on the Bitcoin Blockchain. At this point, Alice's bitcoin is "on-chain," meaning that the transaction has been broadcast to the entire Bitcoin network, verified by all Bitcoin nodes, and "mined" (recorded) onto the Bitcoin blockchain.
So far, the Eclair Mobile wallet has behaved only as a Bitcoin wallet and Alice hasn't used the Lightning Network features of Eclair. As is the case with many LN wallets, Eclair bridges Bitcoin and the Lightning Network by acting as both a Bitcoin wallet and a Lightning wallet.
So far, the Eclair Mobile wallet has behaved only as a Bitcoin wallet, and Alice hasn't used the Lightning Network features of Eclair. As is the case with many LN wallets, Eclair bridges Bitcoin and the Lightning Network by acting as both a Bitcoin wallet and a Lightning wallet.
Now, Alice is ready to start using the Lightning Network by taking her bitcoin "off-chain", so she can take advantage of the fast, cheap and private payments that LN offers.
Now, Alice is ready to start using the Lightning Network by taking her bitcoin "off-chain," so she can take advantage of the fast, cheap, and private payments that the Lightning Network offers.
==== Lightning Network Channels
Swiping right, Alice accesses the "LIGHTNING CHANNELS" section of Eclair. Here she can manage the LN channels that will connect her wallet to the Lightning Network.
Let's review the definition of a "Lightning Network Channel" at this point, to make things a bit more clear. Firstly, the word "channel" is a metaphor for a _financial relationship_ between Alice's LN wallet and another LN wallet. We call it a channel because it is a means for Alice's wallet and this other wallet to exchange many payments with each other on the Lightning Network (off-chain), without committing transactions to the Bitcoin Blockchain (on-chain).
Let's review the definition of a "Lightning Network Channel" at this point, to make things a bit clearer. Firstly, the word "channel" is a metaphor for a _financial relationship_ between Alice's LN wallet and another LN wallet. We call it a channel because it is a means for Alice's wallet and this other wallet to exchange many payments with each other on the Lightning Network (off-chain), without committing transactions to the Bitcoin Blockchain (on-chain).
The wallet or _node_ that Alice opens a channel to, is called her _channel peer_. Once "opened", a channel can be used to send many payments back and forth between Alice's wallet and her channel peer.
The wallet or _node_ that Alice opens a channel to is called her _channel peer_. Once "opened," a channel can be used to send many payments back and forth between Alice's wallet and her channel peer.
Furthermore, Alice's channel peer can _forward_ payments via other channels further into the Lightning Network. This way, Alice can _route_ a payment to any wallet (eg. Bob's LN wallet) as long as Alice's wallet can find a _path_ made by hoping from channel to channel, all the way to Bob's wallet.
Furthermore, Alice's channel peer can _forward_ payments via other channels further into the Lightning Network. This way, Alice can _route_ a payment to any wallet (e.g. Bob's LN wallet) as long as Alice's wallet can find a _path_ made by hopping from channel to channel, all the way to Bob's wallet.
All this to say: Alice needs one or more channels that connect her to one or more other nodes on the Lightning Network. She doesn't need a channel to connect her wallet directly to Bob's Cafe in order to send Bob a payment, though she can choose to open a direct channel too. Any well-connected node in the Lightning Network can be used for Alice's first channel. In this example, since we want to also demonstrate payment routing, we won't have Alice open a channel directly to Bob's wallet. Instead we will have Alice open a channel to a well-connected node and then later use that node to forward her payment, routing it through any other nodes, as necessary to reach Bob.
All this to say: Alice needs one or more channels that connects her to one or more other nodes on the Lightning Network. She doesn't need a channel to connect her wallet directly to Bob's Cafe in order to send Bob a payment, though she can choose to open a direct channel too. Any well-connected node in the Lightning Network can be used for Alice's first channel. In this example, since we want to also demonstrate payment routing, we won't have Alice open a channel directly to Bob's wallet. Instead, we will have Alice open a channel to a well-connected node and then later use that node to forward her payment, routing it through any other nodes as necessary to reach Bob.
At first, there are no open channel, so as we see in <<eclair-tutorial2.png>>, the "LIGHTNING CHANNELS" tab displays an empty list. If you notice, on the bottom right corner there is a plus symbol (+), which is a button to open a new channel.
At first, there are no open channels, so as we see in <<eclair-tutorial2.png>>, the "LIGHTNING CHANNELS" tab displays an empty list. If you notice, on the bottom right corner, there is a plus symbol (+), which is a button to open a new channel.
[[eclair-channels]]
.Lightning Channels Tab
@ -238,7 +238,7 @@ Alice presses the plus symbol and is presented with four possible ways to open a
* Random node
* ACINQ node
A "node URI" is a Universal Resource Identifier (URI) that identifies a specific LN node. Alice can either paste such a URI from her clipboard, or scan a QR code containing that same information. An example of a node URI is shown as a QR code in <<node-URI-QR>> and below it as a text string:
A "node URI" is a Universal Resource Identifier (URI) that identifies a specific LN node. Alice can either paste such a URI from her clipboard or scan a QR code containing that same information. An example of a node URI is shown as a QR code in <<node-URI-QR>> and below it as a text string:
While Alice could select a specific LN node, or use the "Random node" option to have the Eclair wallet select a node at random, she will select the "ACINQ Node" option to connect to one of ACINQ's well-connected LN nodes.
Choosing the ACINQ node will slightly reduce Alice's privacy, as it will give ACINQ the ability to see all of Alice's transactions. It will also create a Single Point of Failure, since Alice will only have one channel and if the ACINQ node is not available, Alice will not be able to make payments. To keep things simple at first, we will accept these trade-offs. In subsequent chapters will gradually learn how to gain more independence and make fewer trade-offs!
Choosing the ACINQ node will slightly reduce Alice's privacy, as it will give ACINQ the ability to see all of Alice's transactions. It will also create a Single Point of Failure, since Alice will only have one channel, and if the ACINQ node is not available, Alice will not be able to make payments. To keep things simple at first, we will accept these trade-offs. In subsequent chapters we will gradually learn how to gain more independence and make fewer trade-offs!
Alice touches "ACINQ Node" and is ready to open her first LN channel.
Alice selects "ACINQ Node" and is ready to open her first LN channel.
==== Opening an LN Channel
When Alice selects a node to open a new channel, she is asked to select how much money she wants allocated to this channel. In subsequent chapters we will discuss the implications of these choices, but for now Alice will allocate almost all her funds to the channel. Since she will have to pay transaction fees to open the channel, she will select an amount a few dollars (or a few thousandths of a bitcoin) less than her total balance.
When Alice selects a node to open a new channel, she is asked to select how much bitcoin she wants to be allocated to this channel. In subsequent chapters, we will discuss the implications of these choices, but for now, Alice will allocate almost all her funds to the channel. Since she will have to pay transaction fees to open the channel, she will select an amount a few dollars (or a few thousandths of a bitcoin) less than her total balance.
Alice allocates 0.018BTC of her 0.020 total to her channel and accepts the default fee rate, as shown in <<eclair-open-channel>>.
Once she clicks "OPEN", her wallet constructs the special Bitcoin transaction that opens an LN channel, known as the _funding transaction_. The funding transaction is sent to the Bitcoin Network for confirmation.
Alice now has to wait, again (see <<eclair-channel-waiting>>), for the transaction to be recorded in the Bitcoin Blockchain. As with the initial Bitcoin transaction that she used to acquire her bitcoin, she has to wait for six or more confirmations (approximately one hour).
Alice now has to wait again (see <<eclair-channel-waiting>>) for the transaction to be recorded on the Bitcoin Blockchain. As with the initial Bitcoin transaction that she used to acquire her bitcoin, she has to wait for six or more confirmations (approximately one hour).
[[eclair-channel-waiting]]
.Waiting for the Funding Transaction to Open the Channel
@ -287,19 +287,19 @@ Did you notice that the channel amount seems to have changed? It hasn't: the cha
=== Buying a Cup of Coffee
Alice now has everything ready to start using the Lightning Network. As you can see it took a bit of work and a bit of waiting for confirmations. But now things get very fast and easy. The Lightning Network enables payments with having to wait for confirmations, as funds are settled in seconds.
Alice now has everything ready to start using the Lightning Network. As you can see, it took a bit of work and a bit of time waiting for confirmations. However, now things get very fast and easy. The Lightning Network enables payments without having to wait for confirmations, as funds get settled in seconds.
Alice grabs her mobile device and runs to Bob's Cafe in her neighborhood. She is excited to try her new LN wallet and use it to buy something!
==== Bob's Cafe
Bob has a simple Point-of-Sale (PoS) application for the use of any customer who wants to pay with bitcoin over the Lightning Network. As we will see in the next chapter, Bob uses the popular open source platform _BTCPay Server_ which contains all the necessary components for an e-commerce or retail solution, such as:
Bob has a simple Point-of-Sale (PoS) application for the use of any customer who wants to pay with bitcoin over the Lightning Network. As we will see in the next chapter, Bob uses the popular open source platform _BTCPay Server_, which contains all the necessary components for an e-commerce or retail solution, such as:
* A Bitcoin Node using the Bitcoin Core software
* A Lightning Node using the c-lightning software
* A simple PoS application for a tablet
BTCPay Server makes it very simple to install all the necessary software, upload pictures and product prices and launch a store very quickly.
BTCPay Server makes it very simple to install all the necessary software, upload pictures and product prices, and launch a store very quickly.
On the counter at Bob's Cafe, there is a tablet device showing <<bob-cafe-posapp>>:
@ -315,7 +315,7 @@ Alice selects the "Cafe Latte" option from the screen and is presented with a _L
.LN Invoice for Alice's latte
image:images/bob-cafe-invoice.png[]
To pay the invoice, Alice opens her Eclair wallet and selects the "Send" button (which looks like a rightfacing arrow) under the "TRANSACTION HISTORY" tab, as shown in <<alice-send-start>>.
To pay the invoice, Alice opens her Eclair wallet and selects the "Send" button (which looks like a right-facing arrow) under the "TRANSACTION HISTORY" tab, as shown in <<alice-send-start>>.
[[alice-send-start]]
.Alice Send
@ -327,8 +327,8 @@ Alice selects the option to "scan a payment request" and scans the QR code displ
.Alice's Send Confirmation
image:images/alice-send-detail.png[width=300]
Alice presses "PAY", and a second later, Bob's tablet shows a successful payment. Alice has completed her first Lightning Network payment. It was fast, inexpensive and easy! Now she can enjoy her latte, which was purchased using the most advanced payment technology in the world.
Alice presses "PAY," and a second later, Bob's tablet shows a successful payment. Alice has completed her first Lightning Network payment! It was fast, inexpensive, and easy. Now she can enjoy her latte, which was purchased using the most advanced payment technology in the world.
=== Conclusion
In this chapter, we followed Alice as she downloaded and installed her first LN wallet, acquired and transferred some bitcoin, opened her first LN channel and bought a cup of coffee by making her first payment on the Lightning Network. In the following chapters will we look "under the covers" at how each component in the Lightning Network works, and how Alice's payment reached Bob's Cafe.
In this chapter, we followed Alice as she downloaded and installed her first LN wallet, acquired and transferred some bitcoin, opened her first LN channel, and bought a cup of coffee by making her first payment on the Lightning Network. In the following chapters, we will look "under the covers" at how each component in the Lightning Network works, and how Alice's payment reached Bob's Cafe.
Darius Parvin
4 years ago
committed by
GitHub