Bitcoin was originally designed primarily as a decentralized digital currency.
But over the years, developers have found new ways to use Bitcoin’s blockchain for more than simply transferring BTC.
One of the more recent developments is Bitcoin Runes.
The Runes Protocol is a system for creating and managing fungible tokens on the Bitcoin blockchain.
That might sound complicated, but the basic idea is simple.
A fungible token is a digital asset where each unit is interchangeable with another unit of the same token.
For example:
1 BTC = 1 BTC
If you have one bitcoin and I have one bitcoin, the two units are functionally interchangeable.
Bitcoin Runes use a similar concept to allow different fungible tokens to exist within Bitcoin’s transaction system.
This makes Runes different from Bitcoin Ordinals, which are primarily associated with individual satoshis and unique inscriptions.
The Runes Protocol was created by Casey Rodarmor, the same developer behind the Ordinals protocol, and officially launched on Bitcoin at the fourth Bitcoin halving in April 2024.
Since then, Runes have become an important part of the discussion around Bitcoin-based tokens and applications.
But what exactly are they?
How do they work?
Why were they created?
And how are they different from Ethereum’s ERC-20 tokens or Bitcoin Ordinals?
This guide explains Bitcoin Runes from the ground up.
What Is a Bitcoin Rune?
A Bitcoin Rune is a fungible token created and managed using the Runes Protocol on the Bitcoin blockchain.
Unlike BTC itself, a Rune is not a native Bitcoin asset.
Instead, it is a token whose rules and balances are represented through Bitcoin transaction data.
For example, imagine someone creates a Rune called:
TOKEN
They might issue:
1,000,000 TOKEN
Those tokens can then be transferred between users using Bitcoin transactions.
The important distinction is:
BTC is Bitcoin’s native currency.
Runes are token assets built using Bitcoin’s blockchain.
This is similar to how Ethereum supports tokens that are separate from ETH.
However, Runes use a very different technical architecture from Ethereum’s ERC-20 standard.
What Does “Fungible” Mean?
The word fungible is essential to understanding Runes.
Something is fungible when individual units are interchangeable.
Money is a common example.
If you have a $10 banknote and I have another $10 banknote, neither is normally considered more valuable simply because it is a particular physical note.
Both represent $10.
The same principle applies to fungible cryptocurrency tokens.
If a Rune has:
1,000 units
then each unit is generally intended to be equivalent to another unit of that same Rune.
This is different from a unique collectible.
For example, imagine an artist creates:
Artwork #1
and:
Artwork #2
Even if both are from the same collection, each can be individually identified.
That is closer to the concept behind NFTs and Ordinal inscriptions.
So a simple comparison is:
Runes → fungible
Ordinals → commonly used for unique inscriptions
Bitcoin Runes vs. Bitcoin Ordinals
If you’ve just read our guide to Bitcoin Ordinals, this distinction is particularly important.
Both protocols operate on Bitcoin.
Both were created by Casey Rodarmor.
And both use Bitcoin’s existing transaction infrastructure.
But their purposes are different.
Bitcoin Ordinals
Ordinals provide a system for identifying individual satoshis.
They are commonly used for inscriptions containing:
- Images
- Text
- Audio
- Video
- Other digital data
Bitcoin Runes
Runes are designed for fungible tokens.
They can represent token balances that are transferred between Bitcoin transaction outputs.
The simplest way to remember the difference is:
Ordinals = unique digital artifacts associated with satoshis
Runes = fungible tokens represented through Bitcoin transactions
Our previous article, What Are Bitcoin Ordinals? A Beginner’s Guide to Ordinals and Inscriptions, goes deeper into the first system.
Why Were Bitcoin Runes Created?
Before Runes, Bitcoin already had several token-related protocols.
Some of them relied heavily on inscriptions and large amounts of transaction data.
The Runes Protocol was designed as a more specialized system for fungible tokens.
Its design focuses on using Bitcoin’s existing UTXO model rather than creating a completely separate account-based token system.
This can provide a more Bitcoin-native approach to fungible assets.
The protocol was also designed with efficiency and reduced unnecessary blockchain data in mind compared with some earlier token approaches.
However, “more efficient” doesn’t mean that Runes use no block space.
They still require Bitcoin transactions.
And because Bitcoin block space is limited, Rune activity can still compete with ordinary Bitcoin transactions.
When Did Bitcoin Runes Launch?
The Runes Protocol launched in April 2024, around Bitcoin’s fourth halving.
The timing was deliberate.
The launch occurred at approximately block 840,000, the block associated with Bitcoin’s fourth halving.
At that point, the Bitcoin block subsidy fell from:
6.25 BTC → 3.125 BTC
The launch attracted substantial attention because it combined two major Bitcoin events:
Bitcoin Halving + Runes launch
This produced significant interest from developers, traders, collectors, and the broader cryptocurrency community.
However, the launch also generated a major increase in Bitcoin transaction activity and fees.
Why Was the Bitcoin Halving Important to Runes?
The halving itself did not create the Runes Protocol.
The Runes Protocol was already designed and scheduled to launch around that block.
However, launching at the halving created a major event for the Bitcoin ecosystem.
The fourth halving was already expected to attract significant attention.
Adding a new Bitcoin token protocol to the same moment created additional demand for block space.
As users rushed to interact with newly launched Runes-related projects, Bitcoin transaction activity increased.
This demonstrated an important characteristic of Bitcoin:
Block space is scarce.
When many people want to use the network simultaneously, they compete for that limited space through transaction fees.
How Do Bitcoin Runes Work?
The Runes Protocol uses Bitcoin transactions to record information about fungible tokens.
At a high level, the system works through two important concepts:
Rune definitions
These describe the properties of a particular Rune.
Rune balances
These determine how many units of a particular Rune are associated with Bitcoin transaction outputs.
Instead of maintaining a separate centralized database, the protocol interprets specific Bitcoin transaction data to determine how Rune balances change.
This means the Bitcoin blockchain provides the underlying record.
Runes and Bitcoin’s UTXO Model
One of the most important technical differences between Runes and many Ethereum tokens is their relationship with UTXOs.
Bitcoin uses the Unspent Transaction Output (UTXO) model.
A Bitcoin transaction consumes existing outputs and creates new outputs.
For example:
Alice’s UTXO
↓
Bitcoin transaction
↓
Bob’s UTXO
Runes can use this same transaction structure to represent token transfers.
A Rune balance can therefore be associated with a Bitcoin transaction output.
This is one reason the protocol is considered relatively Bitcoin-native.
If you’re unfamiliar with UTXOs, our guide on What Is a Bitcoin UTXO? is worth reading before going deeper into Runes.
How Is a Rune Created?
Creating a new Rune is called etching.
The person creating the Rune establishes its basic properties through an etching transaction.
These properties can include things such as:
- Rune name
- Symbol
- Divisibility
- Premine
- Minting conditions
- Supply-related information
Once etched, the Rune becomes a defined token within the Runes Protocol.
The creator can then distribute or mint units according to the rules established for that Rune.
What Is Rune Etching?
Etching is the process of defining a new Rune.
Think of it as creating the token’s basic specification.
A creator can define characteristics such as:
Name
The Rune’s identifier.
Symbol
A symbol used to represent the Rune.
Divisibility
How many decimal places the Rune can support.
Premine
Whether the creator receives a specified amount of the Rune before public minting.
Mint terms
Rules describing whether additional units can be minted.
The exact protocol rules are more technical, but the basic idea is straightforward:
Etching establishes the Rune.
What Is Rune Minting?
After a Rune has been etched, its creator may establish a minting process.
Minting creates additional units of that Rune according to the rules defined by the protocol.
For example, imagine a Rune has a mint limit of:
1,000 tokens per mint
and allows:
10,000 mints
The total supply generated through open minting could theoretically reach:
10,000,000 tokens
assuming all mint conditions are satisfied.
Minting rules can therefore determine how a Rune’s supply is distributed.
Not every Rune necessarily uses open minting.
A Rune can also have a premine or other supply arrangements.
What Is a Rune Premine?
A premine is an amount of a Rune allocated to the creator during the etching process.
For example, a creator might establish:
Total supply: 1,000,000 RUNE
and allocate:
100,000 RUNE
as a premine.
The remaining supply might then be available through a minting process.
A premine can therefore influence how token ownership is initially distributed.
Users should pay attention to premine information when evaluating any Rune project because a large allocation controlled by a small number of wallets can create significant concentration.
What Is Rune Divisibility?
Divisibility determines whether a Rune can be divided into smaller units.
For example, imagine a Rune has:
Divisibility = 2
A holder could potentially own:
10.50 units
rather than only whole units.
This is conceptually similar to how Bitcoin can be divided into satoshis.
However, Rune divisibility is determined by the Rune’s protocol settings.
Not every Rune necessarily has the same divisibility.
How Are Runes Transferred?
Rune transfers occur through Bitcoin transactions.
A simplified example looks like this:
Alice owns 1,000 Rune units
↓
Alice creates a Bitcoin transaction
↓
Rune allocation is specified
↓
Output is assigned 600 Rune units to Bob
↓
400 Rune units remain with Alice
The exact transaction structure is more technical than this simplified example, but the basic idea is that Rune balances can move between Bitcoin transaction outputs.
This is fundamentally different from simply sending BTC.
The Bitcoin transaction contains the information needed by Rune-aware software to interpret the token transfer.
What Is a Rune Transfer Edict?
The Runes Protocol uses a concept called an edict to describe how Rune balances are distributed within a transaction.
An edict can specify things such as:
- Which Rune is being transferred
- How many units are being transferred
- Which output receives them
- How many times a mint operation occurs
This allows a single Bitcoin transaction to define how Rune balances should be distributed across outputs.
It is one of the mechanisms that makes the protocol work without requiring a separate blockchain.
What Happens to Runes When You Spend Bitcoin?
This is where Runes become particularly interesting.
A Bitcoin UTXO can contain both:
BTC value
and:
Rune balances
When the UTXO is spent, Rune-aware software needs to determine where those Rune balances should go.
The protocol interprets the transaction according to the Runes rules.
This allows Rune balances to move between Bitcoin outputs while the underlying Bitcoin transaction system remains unchanged.
It also means that wallets need to understand the protocol if they want to manage Runes properly.
What Happens If a Rune Transaction Is Invalid?
The Runes Protocol includes rules for handling transactions that don’t correctly follow its instructions.
One important concept is a cenotaph.
A cenotaph is essentially a malformed or invalid Rune protocol message.
The protocol has specific rules for handling these situations.
This is useful because a decentralized system needs deterministic rules for interpreting malformed transactions.
Without such rules, different software implementations could potentially interpret the same transaction differently.
What Is a Cenotaph?
A cenotaph is a transaction or protocol message that fails to follow certain Runes rules.
Rather than allowing different applications to interpret the mistake differently, the protocol defines how the invalid message should be handled.
This helps preserve consistent interpretation across Rune-aware software.
For beginners, you don’t need to memorize the technical details.
The important point is:
Runes have explicit rules for handling malformed protocol messages.
Do Runes Exist Outside Bitcoin?
The Runes Protocol operates on Bitcoin.
However, a Rune itself is not BTC.
This distinction is important.
Think of it like this:
Bitcoin blockchain
→ BTC
→ Runes
→ Ordinals
These are different types of assets or systems operating within the broader Bitcoin ecosystem.
BTC is Bitcoin’s native currency.
Runes are token assets represented through the Runes Protocol.
Ordinals provide a system for identifying satoshis and associating inscriptions with them.
Are Bitcoin Runes Smart Contracts?
No.
Runes aren’t equivalent to Ethereum smart contracts.
Ethereum allows developers to deploy general-purpose smart contracts through the Ethereum Virtual Machine (EVM).
Those contracts can contain programmable logic that manages tokens, applications, exchanges, lending protocols, and many other systems.
Runes are much more narrowly focused.
The Runes Protocol defines rules for creating, minting, and transferring fungible tokens using Bitcoin transaction data.
This is a key difference between Bitcoin’s approach and Ethereum’s approach.
If you want to understand Ethereum’s model, see our existing guides:
What Are Smart Contracts? A Guide to Self-Executing Agreements
and
What Is the Ethereum Virtual Machine (EVM)? A Complete Guide
Bitcoin Runes vs. Ethereum ERC-20 Tokens
Runes and ERC-20 tokens can serve a similar broad purpose:
creating fungible digital tokens.
But their underlying technology is very different.
Bitcoin Runes
- Operate on Bitcoin
- Use Bitcoin transactions
- Use the UTXO model
- Do not require general-purpose smart contracts
- Are interpreted through the Runes Protocol
Ethereum ERC-20
- Operate on Ethereum
- Use Ethereum smart contracts
- Use Ethereum’s account-based model
- Follow the ERC-20 token standard
- Depend on Ethereum’s smart-contract environment
Both approaches allow fungible tokens to exist.
But they reflect very different blockchain designs.
A Simple Example
Imagine Alice owns:
500 units of a Rune
She wants to send:
100 units to Bob
With a Rune-based system, the transaction can specify how the Rune balance should be allocated between outputs.
The Bitcoin transaction provides the underlying mechanism.
By contrast, with a typical ERC-20 token, Alice interacts with the token’s smart contract on Ethereum.
The contract updates the token balances according to its programmed rules.
The end result can look similar:
Alice → Bob: 100 tokens
But the underlying technology is fundamentally different.
How Do Rune Transactions Actually Work?
To understand Bitcoin Runes properly, it helps to look at what happens when someone creates or transfers them.
A Rune transaction is still a Bitcoin transaction.
There isn’t a separate Runes blockchain processing these transactions.
Instead, the Runes Protocol interprets specific information contained within Bitcoin transactions and uses it to determine what should happen to Rune balances.
A simplified process looks like this:
Bitcoin transaction
↓
Rune protocol information
↓
Rune-aware software interprets the transaction
↓
Rune balances are created, transferred, or assigned
The Bitcoin blockchain provides the permanent transaction history, while the Runes Protocol provides the rules for interpreting the token-related information.
This is similar to how Bitcoin Ordinals add another layer of interpretation to Bitcoin’s transaction history.
How Does a Rune Transfer Work?
Suppose Alice owns 1,000 units of a Rune called EXAMPLE.
She wants to send 250 units to Bob.
At a simplified level, the transaction could be understood as:
Alice’s Bitcoin UTXO
→ Bitcoin transaction
→ 250 EXAMPLE to Bob
→ 750 EXAMPLE remains with Alice
The exact mechanics are handled by the Runes Protocol and the transaction’s outputs.
The important part is that the Rune balance isn’t being transferred through a separate blockchain.
It is being transferred using Bitcoin’s existing transaction system.
This is one of the fundamental ideas behind Runes.
Why Do Runes Use UTXOs?
Bitcoin’s UTXO model provides a natural way to track ownership of Bitcoin outputs.
Instead of maintaining an account balance such as:
Alice = 2.5 BTC
Bitcoin tracks spendable outputs.
For example:
UTXO A = 1 BTC
UTXO B = 1.5 BTC
The owner controls these outputs through their private keys.
Runes build on this model.
Rune balances can be associated with Bitcoin transaction outputs, allowing the protocol to determine where those token balances should move when the outputs are spent.
This approach is different from Ethereum’s account-based system.
For a deeper explanation of Bitcoin’s architecture, see our guide:
How Does Bitcoin Work? A Beginner’s Guide to the Technology Behind Bitcoin
What Is the Runes Protocol Message?
Rune-related instructions are encoded in Bitcoin transactions.
These instructions tell Rune-aware software how to interpret the transaction.
For example, protocol information can describe:
- A new Rune being created
- A Rune being minted
- Rune balances being transferred
- Rune-specific properties
The transaction itself remains a Bitcoin transaction.
The Runes Protocol simply gives certain transaction data a specific meaning.
This separation is important.
Bitcoin’s consensus rules don’t suddenly become a general-purpose token platform because Runes exist.
Instead, Runes are a protocol operating within Bitcoin’s existing environment.
What Are Rune Names?
Each Rune needs an identifier.
This identifier is its Rune name.
Names are important because they distinguish one Rune from another.
Imagine two projects both create tokens with similar branding.
A proper Rune identifier helps software distinguish the actual protocol asset from unrelated tokens.
Rune names therefore function as an important part of the protocol’s identity system.
Why Are Rune Names Special?
The Runes Protocol uses specific rules around Rune names.
Names aren’t simply arbitrary strings with unlimited length.
The protocol introduced a minimum name length that has changed over time through the project’s rules.
This was partly designed to make short, desirable names scarce.
As a result, Rune names can themselves become an object of interest within the ecosystem.
This has similarities to domain names.
A short and memorable name can be more desirable because there are fewer of them.
However, name scarcity doesn’t automatically mean a Rune is valuable.
Market demand still determines whether people actually care about a particular name.
Can Anyone Create a Rune?
The Runes Protocol is permissionless.
In principle, anyone who understands the protocol and is willing to pay the required Bitcoin transaction fees can etch a Rune.
This is one of the important characteristics of decentralized blockchain systems.
There isn’t a central company that needs to approve every Rune.
However, permissionless creation comes with an obvious consequence:
Anyone can create something.
That means not every Rune is legitimate, useful, or valuable.
A person can create a Rune with an impressive-looking name and marketing campaign without having a meaningful project behind it.
This makes research extremely important.
What Is an Open Mint?
An open mint allows users to create units of a Rune according to predefined minting rules.
For example, imagine a Rune has:
Mint amount: 100 units
and:
Mint cap: 10,000 mints
If all mint operations occur successfully, the open mint could produce up to:
1,000,000 units
The important part is that the minting rules are established when the Rune is created.
Users can then interact with the mint according to those rules.
What Is a Mint Cap?
A mint cap determines how many times an open mint can be executed.
Suppose a Rune has:
Mint amount = 100
Mint cap = 1,000
The maximum number of units created through the open mint would be:
100 × 1,000 = 100,000 units
This gives the creator a way to establish a defined supply mechanism.
Of course, the actual total supply may also include a premine.
What Is a Premine?
A premine is an allocation given to the creator or another designated party when the Rune is etched.
For example:
Open mint supply: 1,000,000
Premine: 200,000
The creator could therefore initially control 200,000 units while the remaining supply may become available through the minting process.
This is important for anyone researching a Rune project.
A large premine can mean that a significant percentage of the supply is concentrated in relatively few hands.
That doesn’t automatically make a project bad.
But it is information users should understand before making decisions.
Why Does Rune Supply Matter?
Supply can influence how a token ecosystem behaves.
Imagine two projects:
Project A
Total supply:
1,000,000
Project B
Total supply:
100,000,000,000
You cannot compare their prices simply by looking at the number attached to one token.
A token priced at $1 doesn’t necessarily have a smaller or larger valuation than a token priced at $0.001.
You need to consider the total supply and circulating supply.
This is why understanding Rune supply is more useful than simply looking at a token’s individual price.
What Is Rune Divisibility?
Rune divisibility determines whether individual units can be divided into smaller amounts.
For example, a Rune with appropriate divisibility could allow someone to hold:
12.5 units
instead of requiring:
12 or 13 units
This can make a token more practical for certain applications.
However, divisibility is established as part of the Rune’s configuration.
It isn’t something users can arbitrarily change later.
Can Rune Properties Be Changed?
Not all Rune characteristics are freely changeable after creation.
The protocol defines which properties are established during etching and how they behave afterward.
This matters because users shouldn’t assume that a Rune creator can simply change every rule whenever they want.
Before interacting with a Rune, users should examine its protocol information and understand:
- Supply
- Divisibility
- Premine
- Mint conditions
- Mint cap
- Name
- Symbol
Understanding these properties can help distinguish the actual protocol configuration from marketing claims.
What Is a Rune Symbol?
A Rune can have a symbol associated with it.
The symbol is a shorthand representation that can make the token easier to recognize.
For example, a project might use a symbol resembling:
$ABC
The symbol itself doesn’t automatically prove that the Rune is legitimate or valuable.
Just like usernames, website domains, and ticker symbols in other markets, similar branding can create confusion.
Always verify the actual Rune identifier rather than relying only on a symbol.
Why Are Rune Names and Symbols Important for Security?
Imagine a popular project called:
BITCOIN TOKEN
A scammer could create another Rune using:
BITCOIN TOKEN 2
and use similar artwork and branding.
A beginner might assume they are the same project.
This is why users should verify the exact Rune identifier and not rely exclusively on:
- Logo
- Name displayed by a marketplace
- Social-media username
- Ticker
- Profile picture
Blockchain assets need to be verified at the protocol level.
Runes vs. Ordinals: A Deeper Comparison
The easiest way to understand the difference is to compare what each protocol is designed to represent.
| Feature | Bitcoin Runes | Bitcoin Ordinals |
|---|---|---|
| Main purpose | Fungible tokens | Individual sats and inscriptions |
| Fungibility | Fungible | Often used for unique assets |
| Underlying blockchain | Bitcoin | Bitcoin |
| UTXO model | Yes | Yes |
| Native BTC required for fees | Yes | Yes |
| Smart contracts required | No | No |
| Common use | Fungible token issuance | Digital artifacts and collectibles |
| Created by Casey Rodarmor | Yes | Yes |
The two protocols can therefore coexist.
Someone could use Bitcoin for:
BTC → monetary transactions
Ordinals → inscriptions
Runes → fungible tokens
These are different uses of the same underlying blockchain.
Runes vs. Ethereum ERC-20 Tokens
Runes are sometimes described as the Bitcoin equivalent of ERC-20 tokens.
That comparison is useful, but it should not be taken literally.
ERC-20 is a token standard implemented through Ethereum smart contracts.
Runes use Bitcoin transactions and the UTXO model.
ERC-20
Ethereum account
↓
Smart contract
↓
Token balance
Runes
Bitcoin UTXO
↓
Rune protocol instructions
↓
Rune balance
The result can be similar from a user’s perspective:
Token A → Token B
But the architecture underneath is very different.
Why Doesn’t Bitcoin Just Use Smart Contracts Like Ethereum?
Bitcoin and Ethereum were designed with different priorities.
Ethereum was built as a general-purpose programmable blockchain.
Its smart-contract environment allows developers to build complex applications.
Bitcoin’s scripting system is intentionally more limited.
That limitation can be viewed as a disadvantage for some applications, but it can also reduce complexity and keep Bitcoin’s base layer focused.
Runes work within Bitcoin’s existing design rather than turning Bitcoin into an Ethereum-style smart-contract platform.
This is one reason the protocol is interesting from a technical perspective.
Do Runes Make Bitcoin Programmable?
Bitcoin was already programmable before Runes.
Bitcoin transactions use Script, a scripting system that defines conditions under which funds can be spent.
Runes don’t replace Bitcoin Script.
Instead, the Runes Protocol interprets specific transaction data to manage fungible token balances.
So it would be inaccurate to say:
“Runes turned Bitcoin into Ethereum.”
They didn’t.
Runes add a specialized token protocol to Bitcoin without transforming Bitcoin into a general-purpose smart-contract platform.
How Do Runes Affect Bitcoin Transaction Fees?
This is one of the most important practical issues.
Every Rune operation ultimately uses Bitcoin block space.
Bitcoin blocks have limited capacity.
When demand for block space increases, transaction fees can rise.
Imagine that only a few people want to use a highway.
Traffic is light.
Now imagine thousands of additional vehicles suddenly arrive.
The road hasn’t become larger.
Everyone is competing for the same available space.
Bitcoin block space works similarly.
If Rune activity increases demand for transactions, users may need to pay higher fees to get their transactions confirmed quickly.
Did Runes Cause High Bitcoin Fees?
It is too simplistic to say that Runes alone determine Bitcoin fees.
Bitcoin transaction fees are affected by many factors, including:
- Overall network activity
- Number of pending transactions
- Transaction sizes
- Fee rates users are willing to pay
- Market conditions
- Mining activity
- Other applications using Bitcoin
However, the launch of Runes around the fourth Bitcoin halving created a major burst of transaction activity.
That event demonstrated how token protocols can compete for Bitcoin block space.
Why Is Bitcoin Block Space Valuable?
Bitcoin blocks are intentionally limited.
This scarcity is fundamental to the network’s design.
Every transaction consumes some amount of block space.
That includes:
- Simple BTC transfers
- Exchange withdrawals
- Multisignature transactions
- Lightning-related transactions
- Ordinal inscriptions
- Rune transactions
When demand exceeds available capacity, users compete through fees.
This is why understanding the Bitcoin mempool is useful when studying Runes.
Our article What Is the Bitcoin Mempool? Everything Beginners Need to Know explains how unconfirmed transactions wait before being included in a block.
Runes and Bitcoin Miners
Higher transaction activity can create additional fee revenue for miners.
Bitcoin miners receive compensation from:
Block subsidy + transaction fees
The block subsidy decreases after each halving.
As a result, transaction fees become increasingly important to Bitcoin’s long-term security model.
Rune transactions are one possible source of fee demand.
This doesn’t mean Runes are guaranteed to remain popular or that they are necessary for Bitcoin’s security.
It simply means they can contribute to the fee market when users are willing to pay for block space.
Why Did Runes Get So Much Attention at Launch?
Several factors came together in April 2024.
Bitcoin was approaching its fourth halving.
The Runes Protocol was scheduled to launch around the same time.
The cryptocurrency community was already paying close attention to Bitcoin.
Then users began creating and minting new Runes.
This resulted in a large amount of activity concentrated around the launch.
The event became an important demonstration of how much demand a new token protocol could generate on Bitcoin.
What Happened to Bitcoin Fees During the Runes Launch?
Transaction activity around the Runes launch contributed to unusually high demand for Bitcoin block space.
Some users paid significant fees to have their transactions included in blocks.
The event showed that people were willing to compete financially for limited Bitcoin block space to interact with a new token protocol.
It also reignited an older debate:
Should Bitcoin’s block space be used for applications beyond monetary transactions?
Supporters saw the activity as evidence of strong demand for Bitcoin’s block space.
Critics saw it as unnecessary congestion that made Bitcoin more expensive to use for ordinary payments.
The Debate Around Bitcoin Runes
The Runes ecosystem has attracted both supporters and critics.
Supporters point to:
- New Bitcoin use cases
- Fungible token experimentation
- Additional fee demand
- Developer activity
- Bitcoin-native applications
Critics point to:
- Block-space competition
- Potentially higher fees
- Speculative token launches
- Scam projects
- Blockchain data growth
- Concerns about Bitcoin’s primary purpose
A balanced understanding requires acknowledging both sides.
Are Runes Good or Bad for Bitcoin?
There isn’t a universally accepted answer.
It depends on what you believe Bitcoin’s primary purpose should be.
If Bitcoin is viewed as a permissionless settlement network where users should decide how to use block space, Runes can be seen as another legitimate application.
If Bitcoin is viewed primarily as a monetary network where block space should be reserved for financial transactions, Runes may seem unnecessary.
The technical system doesn’t answer that philosophical question.
Bitcoin’s economic incentives do.
Users decide what transactions they are willing to pay for, miners decide which transactions to include, and node operators decide which transactions they relay.
Are Bitcoin Runes an Investment?
A Rune is a technology-enabled token, not automatically an investment.
Some Runes may be traded speculatively.
Others may be associated with communities, applications, experiments, or collectibles.
There is no guarantee that a Rune will retain its value.
A token can lose demand, become inactive, or become difficult to trade.
Even a Rune with a recognizable name can fail.
This is why readers should understand the technology before considering any financial involvement.
The same principle applies to cryptocurrencies generally.
Why Are Rune Tokens Risky?
Permissionless token creation has an important downside:
Anyone can create a token.
That makes it easy for scammers to create assets that look legitimate.
Common risks include:
Fake projects
A token may imitate a legitimate project.
Fake websites
A website may claim to provide Rune minting or trading services while actually attempting to steal wallet credentials.
Phishing
Users may receive messages containing links to fake marketplaces or minting websites.
Malicious transactions
A website may ask users to sign transactions they don’t fully understand.
Concentrated ownership
A small number of wallets may control a large percentage of the supply.
Low liquidity
A token may appear valuable because of a quoted price but have very little actual trading activity.
What Is Rune Dust?
The concept of dust is important when discussing Bitcoin-based tokens.
Bitcoin dust generally refers to extremely small amounts of BTC that may be uneconomical to spend because transaction fees can exceed the value of the output.
Rune-related systems can also create situations where token balances are associated with very small Bitcoin outputs.
This creates an important practical consideration:
The token balance may appear valuable, but spending the underlying Bitcoin output may require transaction fees.
Users therefore need to consider both:
Rune balance
and:
Bitcoin transaction costs
Why Do Runes Need Bitcoin for Fees?
Runes are built on Bitcoin.
Therefore, users still need BTC to pay Bitcoin network transaction fees.
Owning a Rune doesn’t remove the need for BTC.
For example, if someone wants to:
- Mint a Rune
- Transfer a Rune
- Interact with a Rune marketplace
the relevant Bitcoin transaction generally requires BTC to pay the network fee.
This is similar to how users of Ethereum-based tokens need ETH to pay Ethereum gas fees.
Our guide What Are Ethereum Gas Fees? A Complete Guide to How Gas Works explains the Ethereum side of this comparison.
Runes and Wallets
Not every Bitcoin wallet is designed to manage Runes.
A traditional Bitcoin wallet may understand:
BTC
but not necessarily:
Rune balances
This means users should verify that their wallet specifically supports Runes before attempting to transfer or receive them.
A wallet that doesn’t understand a token protocol may display balances incorrectly or fail to provide the controls needed to manage token-specific outputs.
This is one reason specialized Bitcoin applications have become important within the Runes ecosystem.
Never Trust a Random Rune Website
If a website tells you:
“Connect your wallet to claim free Runes.”
stop and verify it first.
Airdrop and minting scams are common throughout cryptocurrency ecosystems.
A website can look professional while still being malicious.
Before connecting a wallet:
- Verify the project’s official website.
- Check the exact Rune identifier.
- Confirm the project’s official social accounts.
- Avoid links sent through unsolicited messages.
- Read the transaction you’re being asked to sign.
- Never provide your seed phrase.
- Don’t assume a free mint is actually free.
Why Seed Phrases Matter
Your seed phrase can control the private keys associated with your cryptocurrency.
If someone obtains it, they may be able to take control of your assets.
No legitimate Rune marketplace needs your seed phrase.
No legitimate support agent should ask you to send it.
No legitimate “verification” process requires you to reveal it.
Treat your recovery phrase as the master key to your wallet.
For a broader explanation, see our guide:
How to Store Bitcoin Safely: Essential Security Tips for Beginners
How Can Beginners Research a Rune?
Before interacting with a Rune, look at its protocol information rather than relying solely on marketing.
Check:
- Exact Rune name
- Symbol
- Supply
- Premine
- Mint terms
- Mint cap
- Divisibility
- Distribution
- Holder concentration
- Trading activity
- Official project information
This won’t guarantee that a project is legitimate.
But it can help you make a more informed assessment.
How Can You Find Bitcoin Runes?
If you want to explore the Runes ecosystem, the safest place to start is with on-chain information rather than social-media posts or promotional websites.
Rune explorers can help users examine information such as:
- Rune names
- Rune IDs
- Supply
- Minting status
- Etching information
- Transactions
- Holders
- Transfer activity
The exact information available depends on the explorer.
The important principle is to verify the asset you’re looking at rather than relying on a project’s logo, ticker, or social-media account.
A popular name can be copied.
A logo can be copied.
A social-media account can be impersonated.
The underlying Bitcoin transaction history is much harder to fake.
How Do Rune Marketplaces Work?
Rune marketplaces provide interfaces where users can discover and trade Rune tokens.
Behind the interface, however, the actual token activity still relies on Bitcoin transactions.
A marketplace might display:
Rune name
Price
Trading volume
Available listings
Transaction history
But users should remember that the marketplace is an application built around the underlying Bitcoin network.
The marketplace itself doesn’t create Bitcoin.
It provides an interface for interacting with assets recorded through the Runes Protocol.
This distinction becomes important if a marketplace disappears.
A centralized website can shut down even though the underlying Bitcoin blockchain continues operating.
Are Rune Marketplaces Centralized?
It depends on the marketplace.
Some services may provide centralized interfaces or custody services, while others may allow users to interact with trades through their own wallets.
Users should understand which model they’re using.
Custodial service
The platform may control the assets on behalf of the user.
Non-custodial service
The user maintains control of the wallet and signs transactions themselves.
Neither model is automatically perfect.
Custodial services can be convenient but introduce counterparty risk.
Non-custodial systems provide more direct control but place more responsibility on the user.
The basic rule is:
If you don’t control the private keys, you don’t have the same level of direct control over the assets.
How Do You Transfer a Rune Safely?
Rune transfers require more care than simply copying a Bitcoin address and pressing send.
The wallet or application needs to understand how Rune balances are associated with Bitcoin outputs.
Before sending:
1. Confirm wallet compatibility
Make sure both the sending and receiving wallets support Runes.
2. Verify the receiving address
Double-check the destination.
3. Check the exact Rune
Make sure you’re sending the intended Rune rather than another asset with a similar name.
4. Review the amount
Check the Rune quantity and any applicable Bitcoin transaction fee.
5. Review the transaction
Don’t blindly approve transactions you don’t understand.
6. Confirm the transaction
After broadcasting, use a reputable Bitcoin/Rune explorer to verify the transaction.
Why Is UTXO Management Important for Runes?
UTXO management is one of the more technical aspects of using Runes.
A wallet may contain multiple Bitcoin UTXOs.
Some may contain Rune balances.
Others may contain only BTC.
If software doesn’t properly understand the relationship between the Rune balance and the Bitcoin output, users can potentially make mistakes.
This is why Rune-aware wallet software matters.
The underlying issue isn’t that Bitcoin itself is unsafe.
It’s that additional token protocols introduce additional complexity.
The more complex the transaction, the more important it becomes to understand what you’re signing.
Can You Accidentally Lose a Rune?
There is a potential risk if a user sends or spends a Bitcoin output without properly accounting for the Rune balance associated with it.
This is one of the reasons specialized wallets and software are important.
Users should avoid manually constructing Bitcoin transactions involving Rune-bearing outputs unless they fully understand the protocol.
A normal Bitcoin transaction might simply involve:
BTC → recipient
A Rune transaction can involve:
BTC + Rune balance → multiple outputs
The software has to interpret those outputs correctly.
For beginners, the safest approach is to use established Rune-aware tools and carefully review transactions before signing.
Bitcoin Runes vs. Ordinals vs. NFTs vs. ERC-20 Tokens
These terms are often mixed together, but they represent different technologies.
| Feature | Bitcoin Runes | Bitcoin Ordinals | Typical NFT | Ethereum ERC-20 |
|---|---|---|---|---|
| Main purpose | Fungible tokens | Satoshis + inscriptions | Unique digital assets | Fungible tokens |
| Blockchain | Bitcoin | Bitcoin | Varies | Ethereum |
| Fungibility | Yes | Usually associated with unique artifacts | No | Yes |
| Smart contract required | No | No | Often | Yes |
| Uses UTXOs | Yes | Yes | Depends on blockchain | No |
| Common use | Token issuance | Digital collectibles/data | Digital collectibles | Fungible tokens |
| Native fee asset | BTC | BTC | Depends on network | ETH |
The key takeaway is that these systems may produce similar user experiences while being built on very different technical foundations.
Are Runes the Same as Bitcoin NFTs?
No.
The confusion mostly comes from the fact that both Runes and Ordinals exist on Bitcoin.
But their purposes are different.
Runes are designed for fungible assets.
Ordinals are associated with individual satoshis and inscriptions.
An inscription could represent a unique digital artifact.
A Rune represents units of a fungible token.
This is similar to the difference between:
A unique collectible
and:
A currency-like token
Can Runes and Ordinals Exist Together?
Yes.
The Bitcoin ecosystem can contain both.
For example:
A project could use an inscription for its artwork while using a Rune for its fungible community token.
This creates an interesting combination:
Ordinals → unique digital content
Runes → fungible token
The two protocols don’t inherently compete for the exact same purpose.
However, both ultimately rely on Bitcoin block space, meaning activity from either can contribute to overall demand for the network.
Advantages of Bitcoin Runes
Runes have several characteristics that make them interesting.
1. Bitcoin-Based
Runes operate directly within the Bitcoin ecosystem.
Projects don’t need to create an entirely separate blockchain.
2. Fungible Token Support
Before Runes, Bitcoin’s ecosystem had fewer straightforward approaches for creating fungible tokens.
Runes provide a dedicated protocol for this purpose.
3. UTXO-Based Design
Runes use Bitcoin’s existing UTXO architecture.
This makes the system more closely aligned with Bitcoin’s underlying transaction model.
4. No General-Purpose Smart Contracts Required
Runes don’t require an Ethereum-style smart-contract platform.
The protocol has a more focused purpose.
5. Permissionless Creation
Anyone capable of interacting with the protocol can potentially create a Rune.
This can encourage experimentation.
However, permissionless creation also creates risks, which we’ll discuss below.
6. Additional Bitcoin Use Cases
Runes demonstrate that Bitcoin can support additional types of digital assets beyond BTC.
This may encourage developers to experiment with Bitcoin-based applications.
Disadvantages and Criticisms of Bitcoin Runes
Runes also have legitimate drawbacks.
1. Block-Space Competition
Rune transactions use Bitcoin block space.
During periods of high demand, this can contribute to congestion and higher fees.
2. Complexity
Runes add another layer of technical complexity to Bitcoin.
Users need to understand wallets, UTXOs, transactions, and token-specific rules.
3. Scam Risk
Because anyone can create a Rune, users can encounter fake projects, impersonations, and speculative tokens.
4. Speculation
Many Rune projects can become heavily driven by speculation rather than actual utility.
A token can attract attention simply because people expect its price to increase.
That doesn’t necessarily mean the underlying project is useful.
5. Concentrated Ownership
Some Runes can have significant premine allocations.
If a small number of wallets control a large portion of the supply, those holders can have substantial influence over the market.
6. Limited Adoption
A protocol can technically work without becoming widely useful.
The long-term success of Runes depends on whether developers, users, and businesses actually find meaningful applications for them.
Are Bitcoin Runes Useful Beyond Speculation?
This is one of the most important questions.
A token protocol doesn’t automatically become useful simply because it exists.
Potential applications could include:
- Community tokens
- Digital rewards
- Bitcoin-based loyalty systems
- Fungible collectibles
- Gaming assets
- Tokenized communities
- Experimental decentralized applications
But potential is not the same as widespread adoption.
Some projects may find useful applications.
Others may remain primarily speculative.
It’s therefore better to evaluate individual projects rather than assuming that every Rune has the same purpose.
Could Runes Be Used for Payments?
Technically, fungible tokens can represent units that are transferred between users.
But that doesn’t mean every Rune is suitable as money.
Bitcoin itself already provides a widely recognized digital monetary asset.
For a Rune to function effectively as a payment token, it would need practical advantages such as:
- Sufficient liquidity
- Stable value
- Broad acceptance
- Reliable wallets
- Low enough transaction costs
- User demand
Most newly created tokens don’t automatically have these characteristics.
Could Runes Be Stablecoins?
A Rune could theoretically be designed as part of an application attempting to represent a stable-value asset.
However, creating a token does not automatically make it a stablecoin.
A genuine stablecoin requires mechanisms designed to maintain its intended value.
Those mechanisms can involve reserves, collateral, algorithms, or other systems depending on the design.
Simply creating a Rune and claiming:
“1 token = $1”
doesn’t guarantee that it will actually remain worth $1.
How Do Runes Compare With Bitcoin Lightning?
Runes and the Lightning Network solve very different problems.
Lightning is designed primarily to enable faster and potentially cheaper Bitcoin payments through a network of payment channels.
Runes are designed for fungible token issuance and transfers on Bitcoin.
So:
Lightning → payment scaling
Runes → fungible token protocol
They can potentially coexist within the broader Bitcoin ecosystem.
Our guide What Is the Bitcoin Lightning Network? Faster and Cheaper Bitcoin Transactions Explained covers Lightning in much more detail.
Are Runes Decentralized?
The underlying Bitcoin blockchain is decentralized.
However, decentralization can mean different things depending on what you’re discussing.
The Bitcoin network has:
- Independent nodes
- Distributed miners
- No central issuer of BTC
A specific Rune project may have:
- A concentrated creator allocation
- Centralized development
- A small group controlling its branding
- Centralized websites or marketplaces
Therefore, you shouldn’t automatically assume:
“It’s on Bitcoin, so the project itself is decentralized.”
The underlying blockchain and the individual token ecosystem are separate things.
What Happens If a Rune Project’s Website Disappears?
This is an important distinction between blockchain data and applications.
If a project website disappears, the Bitcoin blockchain doesn’t disappear with it.
The underlying protocol data can remain on Bitcoin.
However, losing the website can make the project more difficult to use.
For example, users may lose access to:
- Documentation
- Interfaces
- Marketplaces
- Project information
- User-friendly tools
This demonstrates why blockchain permanence doesn’t necessarily mean application permanence.
The blockchain can preserve the underlying data while the surrounding ecosystem changes or disappears.
How Long Will Bitcoin Runes Exist?
As long as the Bitcoin blockchain and software capable of interpreting the protocol continue to exist, Rune-related data can remain part of Bitcoin’s historical record.
But that doesn’t guarantee that every Rune project will remain active.
A project can become abandoned.
A marketplace can close.
Developers can stop maintaining software.
Users can lose interest.
Therefore, it’s important to distinguish between:
Protocol persistence
and:
Project success
They are not the same thing.
The Future of Bitcoin Runes
The long-term future of Runes remains uncertain.
The protocol has demonstrated that Bitcoin can support a dedicated fungible-token ecosystem without adopting Ethereum’s smart-contract architecture.
That alone makes Runes an interesting technical development.
But long-term success will depend on actual usage.
The most important question isn’t:
“How many Runes can people create?”
It’s:
“What useful things will people actually build with them?”
If developers discover applications that provide genuine value, the ecosystem could mature.
If activity remains dominated by short-term speculation, interest could decline.
Both outcomes are possible.
Will Runes Replace ERC-20 Tokens?
Probably not.
Runes and ERC-20 tokens exist within different ecosystems.
Ethereum provides a mature smart-contract environment with thousands of applications.
Bitcoin provides a different architecture with different priorities.
There is no technical requirement that one must completely replace the other.
Instead, the cryptocurrency ecosystem can contain multiple approaches to tokenization.
Runes may be useful to developers who specifically want Bitcoin-based fungible tokens.
ERC-20 may remain useful for applications that require Ethereum’s smart-contract environment.
Will Runes Replace Ordinals?
No.
They serve different purposes.
Ordinals are primarily associated with identifying satoshis and inscriptions.
Runes are designed for fungible tokens.
A Bitcoin application could potentially use both.
For example:
Ordinal inscription → unique artwork
Rune → fungible community token
This is one of the reasons it is useful to understand both protocols separately.
Frequently Asked Questions
What are Bitcoin Runes?
Bitcoin Runes are a protocol for creating and transferring fungible tokens on the Bitcoin blockchain.
Who created Bitcoin Runes?
The Runes Protocol was created by Casey Rodarmor, who also created the Ordinals protocol.
When did Bitcoin Runes launch?
The Runes Protocol launched around Bitcoin’s fourth halving in April 2024.
Are Runes cryptocurrencies?
Runes are token assets represented through the Bitcoin blockchain. They are not Bitcoin itself and don’t have the same status as BTC.
Are Runes the same as Bitcoin?
No.
Bitcoin is the native cryptocurrency of the Bitcoin network.
Runes are fungible tokens created using the Runes Protocol.
Are Runes NFTs?
No.
Runes are designed to be fungible.
NFTs are generally designed around unique assets.
Are Runes the same as Ordinals?
No.
Ordinals identify individual satoshis and enable inscriptions.
Runes are designed for fungible tokens.
Do Runes use Bitcoin?
Yes.
Runes use Bitcoin transactions and Bitcoin block space.
Do Runes require BTC?
Users generally need BTC to pay Bitcoin network transaction fees when interacting with Runes.
What is Rune etching?
Etching is the process of creating and defining a new Rune.
What is Rune minting?
Minting creates units of an already etched Rune according to its predefined minting rules.
What is a Rune premine?
A premine is an allocation of Rune units created for the creator or another designated party during etching.
What is Rune divisibility?
Divisibility determines whether a Rune can be divided into smaller units.
Can anyone create a Rune?
The protocol is permissionless, meaning users can create Runes according to the protocol rules and by paying the required Bitcoin transaction fees.
Are Bitcoin Runes safe?
The underlying Bitcoin network is designed to be secure, but individual Rune projects, websites, marketplaces, and wallets can introduce risks.
Can I lose my Runes?
You can potentially lose control of Rune balances through compromised keys, malicious transactions, incompatible wallet software, or incorrect handling of Rune-bearing outputs.
Are Bitcoin Runes a good investment?
There is no universal answer. Rune prices can be highly speculative, and individual projects can lose value or become inactive.
Do Runes increase Bitcoin fees?
Rune activity can contribute to demand for Bitcoin block space, potentially increasing fee pressure during periods of high network activity. However, many factors affect Bitcoin fees.
Do Runes use smart contracts?
No. Runes don’t require Ethereum-style general-purpose smart contracts.
Are Runes built on Ethereum?
No. Runes are built around Bitcoin’s transaction system.
Final Thoughts
Bitcoin Runes represent one of the more interesting developments in Bitcoin’s expanding ecosystem.
The idea behind them is relatively straightforward:
Runes provide a protocol for creating and transferring fungible tokens using Bitcoin’s blockchain.
What makes the technology interesting is how it achieves this without turning Bitcoin into an Ethereum-style smart-contract platform.
Runes use Bitcoin’s existing transaction infrastructure and UTXO model to represent token balances.
That creates a distinctly Bitcoin-native approach to fungible tokens.
But the technology also raises legitimate questions.
Rune transactions compete for Bitcoin block space.
Token creation is permissionless, which makes experimentation possible but also makes scams easy to create.
Some projects may have significant premines or concentrated ownership.
And, as with almost every cryptocurrency token ecosystem, speculation can sometimes overshadow actual utility.
For beginners, the most important thing is not to look at Runes simply as another opportunity to speculate.
Understand the technology first.
Learn how Bitcoin transactions work.
Understand UTXOs.
Learn how transaction fees work.
Understand wallet security.
Then examine individual Rune projects based on their actual design and use case.
The Runes Protocol doesn’t guarantee that a particular token will succeed.
It simply provides a set of rules for creating and managing fungible tokens within Bitcoin.
Whether Runes eventually become an important part of Bitcoin’s long-term ecosystem or remain a niche experiment will depend on what developers and users build with them.
For now, they represent another example of how Bitcoin’s relatively simple foundation can support new ideas without fundamentally changing what Bitcoin itself is.
And that’s perhaps the most interesting part of Runes.
They don’t replace Bitcoin.
They build another layer of functionality around Bitcoin’s existing architecture.
