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June 3, 2021
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Public vs. Private Blockchain: What’s the Difference?

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Permission
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When Bitcoin launched as the first implementation of the blockchain in 2009, distributed ledger technology (DLT) disrupted multiple industries.

From finance and banking to supply chain management and healthcare, organizations have been leveraging blockchain technology’s benefits to innovate, create more efficient services, as well as provide viable solutions to long-known issues.

That said, if you hear the phrase “blockchain,” probably the first thing that comes to your mind is a highly decentralized, open, community-governed DLT network like Ethereum or Bitcoin.

However, in addition to public blockchains, there is another form of the technology called private blockchains tailored for enterprise usage.

But what is the difference between public and private blockchains, how do they work, and what are their core features?

Let’s find out in this article!

What Blockchain Types Are Out There?

The blockchain refers to a digital ledger that is duplicated and distributed across the devices of all participants in the network in a way that everyone stores the same records and sees related changes in real-time.

But, did you know that there are four types of blockchain networks currently available?

That’s right.

Below, you can find all DLT variations with a small description for each:

  1. Public blockchains: Appeared with the launch of Bitcoin, public blockchains are open for anyone to join and use solutions within the network. Since DLT networks are transparent in nature, everyone can audit and monitor records on public blockchains. For this blockchain type, the read access is open.
  2. Private blockchains: Unlike their public counterparts, private blockchains restrict access for users, only allowing those within a specific organization or who have passed Know Your Customer (KYC) checks and have been approved by the system administrator into the network. For this blockchain type, the read access is closed.
  3. Permissionless blockchains: In a permissionless blockchain, anyone can participate in the consensus mechanism to validate blocks and transactions. Since there are no access controls in place for validators, the write access is open for this blockchain type.
  4. Permissioned blockchains: To achieve higher throughput and tailor DLT networks for enterprise usage, permissioned blockchains limit the number of validators while having access controls in place to select who can participate in the consensus mechanism. For that reason, the write access is closed for this blockchain type.

Since they are similar concepts, the terms private and permissioned, as well as public and permissionless, are often used interchangeably in the cryptocurrency industry.

However, they don’t exactly refer to the same thing.

While the public and private terms focus on whether a DLT network restricts read access for standard users, permissioned and permissionless refer to the presence of access controls for validators (write access).

Generally, all permissionless blockchains are public (open read and write access), and all private blockchains are permissioned (closed read and write access).

On the other hand, not all public blockchains are permissionless, as there are permissioned public DLT networks out there that allow anyone to join and audit the data on the chain but that restrict who can validate blocks.

In the next sections, we will focus on the differences between public and private blockchain networks.

Public vs. Private Blockchains: What Is the Difference Between the Two?

Both public and private blockchains leverage the benefits of DLT technology.

However, the core difference between the two is how they manage user access and whether they control who can validate blocks within the network.

What Is a Public Blockchain?

Examples: Bitcoin, Ethereum, Litecoin,

Most of the blockchain networks on the market are public, meaning that anyone with a working internet connection and a compatible device can access them along with the products, services, and apps in the ecosystem.

At the same time – since everyone keeps the same records on their devices and all modifications are transparently recorded on the digital ledger, users can inspect the data recorded on the public blockchain, trace transactions, and view other information.

Also, as there are no controls in place to restrict access for standard users (thus, no need for KYC), a higher degree of privacy can be achieved in the network.

When a public blockchain is also permissionless, it means that the network is not only free to access for standard users, but it lacks restrictions for validators as well.

As a result, everyone can participate in the consensus mechanism by operating a full node or mining or staking the platform’s native cryptocurrency.

Since the number of validators is high and there’s no central authority that selects them in public DLT networks, it allows for a great level of decentralization.

At the same time, this architecture provides enhanced security against attackers as they would need to take over the majority of the network to succeed.

What Are the Most Important Features of Public Blockchains?

Now that you know what public blockchains are, let’s see their most important features.

  1. Decentralization: In public blockchains, every user is equal without anyone having more authority than others. For that reason, and since nodes and validators are scattered all over the world, this DLT type is highly decentralized. Also, instead of a centralized company, most public blockchains are governed by the community who uses the chains’ native tokens to vote on upgrades and other important matters related to the network’s future.
  2. Privacy: In public blockchains, no KYC or any other forms of identity checks are needed to enter the network and use solutions within the ecosystem. As a result, users can achieve a higher level of privacy.
  3. Transparency: Since anyone can view and audit data on the blockchain, public DLT networks operate transparently. For that reason, it’s much easier to spot malicious, dishonest, and illicit activities in the ecosystem.
  4. Immutability: Due to the nature of the blockchain, once a transaction is recorded on the ledger, it can’t be altered in any way unless the majority of the validators agree to do so. Since public blockchains feature a massive number of validators, it’s almost impossible to tamper with data recorded on the ledger, making public DLT networks immutable.
  5. Censorship-resistance: DLT networks operated by centralized companies are often subject to regulations in some jurisdictions that could lead to some forms of censorship within the ecosystem. On the other hand, public blockchains leverage the power of decentralization to become entirely resistant to censorship.
  6. High Security: In addition to eliminating all risks of a single point of failure, the large-scale participation in the consensus mechanism makes it hard for attackers to take over the network. For example, they have to acquire 51% of the hash rate (the total computing power of devices connected to the network) to gain control of chains using the Proof-of-Work (PoW) consensus algorithm. However, if many miners are maintaining the network, it could effectively prevent such scenarios due to the potential costs of the attack. To achieve such against Bitcoin, an attacker would need to purchase 1.75 million of a popular mining rig that is priced at $10,000 each and feature a hash power of 100 TH/s (the current BTC hash rate is around 175 million TH/s). As a result, malicious parties would have to spend a whopping $17.5 billion to buy the hardware capable of taking over 51% of the network (and we didn’t even take electricity fees into account).

What Is a Private Blockchain?

Examples: Hyperledger Fabric, ConsenSys Quorum

While public DLT networks are meant to be used by the general public for all kinds of purposes, private blockchains are instead tailored for enterprise usage.

For that reason, private DLT solutions have access controls in place both for writing and reading.

This means only users authorized by the system admin can enter the network while the enterprise managing the ecosystem selects the validators that can participate in the consensus mechanism.

As a result, the organization can leverage the benefits of DLT technology while effectively safeguarding sensitive data recorded on the ledger.

To achieve that, everyone seeking to join the network must confirm their identities by submitting to KYC checks.

Upon the approval of the documents, the system administrator will assign different roles with various levels of access to participants in the ecosystem.

For example, while the enterprise may allow all its employees to view standard records, it may give only executives and top managers authorization to access sensitive data.As a result, the enterprise could keep everything under control by setting its own rules in the network.

Furthermore, enterprises not only choose who can validate blocks but also limit the number of validators that can generate blocks and verify transactions.

This gives private blockchains a significant advantage over their public counterparts in terms of scalability and throughput.

While it comes with increased centralization, the fewer the participants are present in the consensus process, the more efficient the network becomes, and the quicker transactions can be processed.

What Are the Most Important Features of Private Blockchains?
  1. Enhanced Scalability: By centralizing the consensus process, private blockchains limit the number of validators, making the network more efficient. As a result, high scalability and transaction throughput can be achieved at much better speeds than with public DLT solutions.
  2. The Ability to Prevent Unauthorized Access: Since only authorized users can use the network with different roles assigned to every participant, sensitive data recorded on private blockchains can be effectively safeguarded by restricting access for the general public, competitors, and malicious parties. Also, with an effective KYC process, enterprises can significantly minimize (or completely eliminate) the presence of illicit activities within the ecosystem.
  3. Cost-Efficiency: As the number of nodes is significantly limited (e.g., 20-30 vs. 10,000+ for public chains), it substantially reduces the costs of maintaining the network.
  4. Regulatory Compliance: Since most private blockchains are operated by businesses, they have to comply with regulations in multiple jurisdictions. While it may be hard to achieve that in a public DLT network, a private blockchain allows the enterprise to set and enforce rules according to regulators’ laws, frameworks, and policies.
  5. Enterprise Customizability: Since they have increased control over the network, enterprises can easily customize private blockchains to fit their needs.

Public vs. Private Blockchains: The Verdict

Both public and private blockchains have an important role in the industry.

While public DLT networks are more suited to fulfill the needs of the general public, private chains are tailored for enterprise usage.

Via an open, decentralized, transparent, and community-governed network, participants of public blockchains can benefit from increased privacy, censorship resistance, and enhanced security.

On the other hand, this DLT type lacks the level of customization for enterprises while suffering limited scalability and network efficiency.

Private blockchains seek to solve these issues by sacrificing decentralization and privacy to achieve better throughput at lower fees by limiting the number of validators.

At the same time, by performing KYC checks and setting their own rules and policies, enterprises can easily customize private chains to fit their preferences, comply with regulations, and prevent unauthorized access.

—

Frequently Asked Questions (FAQ)

1. Is Bitcoin a public or private blockchain network?

Bitcoin is a public blockchain that allows anyone to access the network as well as solutions within the ecosystem without any restrictions. Furthermore, you can also audit transactions, addresses, and other data recorded on the distributed ledger.

All you need is a compatible device and a working internet connection to do so.

In addition to being public, Bitcoin’s blockchain is also permissionless, which means that everyone is free to participate in the consensus process by running a full node or mining BTC.

2. Is a private blockchain centralized?

Since private blockchains have access controls in place for both validators and standard users – who have to be approved by the system administrator (a centralized authority) based on KYC documents –, private blockchains are increasingly centralized.

3. What is the use-case of private blockchains?

Private blockchains are tailored to fit the needs and preferences of enterprises, governments, non-profits, and other organizations.

Some example use-cases of private blockchains for businesses include supply chain management, digital identity, finance, B2B, healthcare, and food tracking solutions.

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Is Muse Family Friendly?

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Haven't downloaded Meta's new AI agent?
Even if it's a hard pass for you, Muse still keeps a file on you, according to its own operating instructions.

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Muse launched September 8 and reached an estimated 10.9 million downloads worldwide by October 20, according to Sensor Tower. People connect it to their email, calendar, and messages, even to their bank accounts and health data. WIRED reported that independent AI researcher Karan Joshi got Muse to reveal that it was instructed to keep "a page for every person in the user's life." Family. Friends. Partners. Coworkers.

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Those people don't use Muse, and as researchers wrote, they "have no say in being profiled." Their information still ends up working for Meta. Meta has to know the people around you to be useful, and Muse works from public information and what users choose to share. But it wouldn't be the first time Meta kept tabs on people who never signed up. In 2018, Mark Zuckerberg told Congress that Facebook collects data on non-users.

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What you tell Meta's AI

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Since December 2025, what people say to Meta AI has shaped the ads they see across Meta's apps, and in most countries there's no way to opt out. That's a billion monthly users whose questions, worries, and plans can become ad signals. Help with a budget, a gift for a partner, a job they want to quit: every question reveals what someone needs, fears, or wants to buy. You produce it. Meta sells access to it.

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Meta says Muse isn't connected to its ad system. But Muse is designed to know your inbox, your calendar, your bank account, and the people in your life, and the line between Muse and Meta's ads is a company policy. Policies can change.

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‍Follow the money

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In the third quarter of 2026, Meta earned $63 billion from advertising. That's nearly 98 cents of every dollar it brought in, and an average of $17.72 per person in just three months.

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It's also why Meta put 39 percent of its October ad spending into promoting Muse, according to Sensor Tower. An agent inside your inbox, calendar, and bank account is the richest data source Meta has ever built. And even Muse's "forget" command, TIME found, doesn't necessarily erase the message that contained the secret.

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What families are up against

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Muse is adults-only, but the people in a user's life get a page, too, kids included. The nonprofit Fairplay says Muse's cuddly mascot, Jolly, is built to appeal to young children. Its striking resemblance to Disney Pixar's Baymax is deceptive. And in December, Meta plans to ship Muse Charm, a Tamagotchi-style gadget with a camera and microphones.

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According to Pew Research Center, 64 percent of U.S. teens use AI chatbots, but only about half of parents say their own teen does. When a kid confides in a chatbot, that conversation may become data. Our kids are growing up generating value they'll never see, for companies they never chose.

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Own Your Data®

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Giving up on AI isn't the answer. The problem isn't that an assistant knows you. It's who owns that knowledge, and who profits from it.

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With data ownership, an AI assistant can still remember your plumber, plan your week, and help with your budget, without a company keeping a copy of your life to sell. You decide what gets shared, with whom, and for how long. And when your data creates value, you share in it.

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That matters more as the Agentic Web arrives, where AI agents will shop, book, compare, and negotiate on our behalf. Whoever owns that data will own the value it creates. If that's Meta, the Agentic Web becomes the most complete surveillance system ever built. If it's you, you get the full benefit of AI and keep control of the information that makes it work.

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The question isn't whether to use AI. 

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Your data has value. It should be yours.

The Algorithm Is Working

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At six years old, she started watching YouTube and graduated to Instagram at nine. She spent more than 16 hours on Instagram in a single day.
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‍When Instagram chief Adam Mosseri was asked about this usage on the witness stand, he called it "problematic use."
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A jury in Los Angeles decided differently. In March, Meta and YouTube were found negligent, and the girl, a 20-year-old woman at the time of settlement, was awarded $6 million in damages. TikTok and Snap settled before the trial began. Meta and Google representatives disagree with the verdict.
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‍Look at what was on trial. Not a video. Not a post. Not a bad actor. It was target-designed algorithms. That's the argument here. Your child isn't failing a willpower test. They're up against one of the most sophisticated persuasion machines ever built, and it is working exactly as intended.

How the hook works

‍What will keep this person here? This is the directive every recommendation algorithm runs on. It learns from every pause, replay, and skip. It never gets tired, and it never cares about your kid’s bedtime.
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At YouTube, that machine drives more than 70 percent of everything people watch, according to Neal Mohan, the company’s product chief in 2018. Mohan said YouTube’s algorithm for mobile sessions hooked people in for an hour on average. A YouTube memo shown at the trial stated that to win teens, you bring them in as tweens.

In the same trial, state attorneys pointed out that TikTok internal research found that a user forms a habit after watching 260 videos. With clips as short as eight seconds playing automatically, that's roughly 35 minutes. The same findings say TikTok's researchers tied compulsive use to anxiety and weaker memory and analytical skills.
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‍At Instagram, a 2019 study found teens felt "hooked despite how it makes them feel." One employee wrote that people were binging so hard they could no longer feel the reward. Others, in messages revealed in court, called themselves "basically pushers." And a 2017 executive email said Mark Zuckerberg had made teens the company's top priority.
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In gaming, Roblox averaged 132 million daily players in early 2026. Among those, about three in four are under 18. The company reports hours engaged to investors every quarter, right next to its user counts.
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And, in 2025, a Pew Research Center study found that “roughly one in five U.S. teens say they're on TikTok and YouTube almost constantly.” 

Follow the incentive

‍Why build it this way? Because these apps are free, so kids aren't the customer. Their attention is. More screen time means more ads, more captured data, and more reasons for kids to open the app tomorrow. A product that makes a kid feel good and then logs off is a product that loses. And here’s what happens when safety collides with that math.
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“Roblox left the front door unlocked, and discord handed predators a private room,” said Arkansas Attorney General Tim Griffin when he filed suit against the gaming company alleging that Roblox rejected employee proposals to warn kids and parents about grooming. “Children paid the price. That stops now.”
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‍Then came August. Meta agreed to pay about $17 billion to settle claims brought by 51 attorneys general who accused the company of designing Instagram to hook kids. They pointed to infinite scroll, algorithmic recommendations, and constant notifications. The attorneys called it the largest state settlement with a single defendant in history. Meta said they’d done nothing wrong, arguing teen mental health is too complex to pin on one app.
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Again, the goal, or incentive, is for Roblox, TikTok, and Instagram to continue to evolve algorithms to “hook” kids and then deny their own documentation. 

What parents are really up against

‍For parents, it’s a stopwatch tool vs. a data war. A screen-time total tells you how long. It doesn't tell you what the algorithm fed your kid, which loops they're stuck in, or what's pulling at them at 1 a.m. According to the Pew Research Center, about four in ten parents say they could be doing better at managing screen time.
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Parents themselves can’t out-engineer the algorithm. They need to see it: what their kids are watching, playing, and asking AI. They also need better ways to steer than a flat "no." That’s where Permission, Family Friendly AI™ comes in.

Permission gives parents AI-powered insight into how their kids use AI and the internet, then helps guide healthier habits and reward positive ones.

These companies had years to build the brakes. Parents shouldn't have to wait for the next verdict to help protect their kids.

The Impact of Growing Up Online

Oct 6th, 2026
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As a parent, it’s painful to imagine your child struggling with something you can’t see. And yet, this may be happening more than you realize. 

A 2025 study involving 4,285 young people brings that concern into focus. Those who developed increasingly addictive patterns of social media use had more than twice the risk of suicidal behaviors compared with those whose use was lower.

For your family, that means something far more frightening than another argument about putting the phone away. It means the possibility that the child you love could be hurting enough to put their own life in danger, while you’re planning dinner, reminding them about homework, and assuming they’re having an ordinary day.

You want your child to have a bright future full of friendships, discoveries, and possibilities. Protecting that future starts with understanding what they’re experiencing now, including what makes their online world so difficult to step away from.

You might notice they’ve stopped joining family activities or seem distressed when they can’t check their phone. You might ask questions only to hear “I’m fine” and wonder whether to keep asking. None of these moments alone tells you what is happening, but they can certainly leave you feeling helpless.

Your child may need more than a reminder to log off. They may need help naming what feels overwhelming, stepping away from an unhealthy pattern, or finding support they aren’t sure how to ask for.

A phone can be put in a drawer. Whatever your child is carrying emotionally may still be there. Making room for that conversation means giving them somewhere to bring the difficult parts of their digital life.

How does technology affect kids' development?

Technology is a double-edged sword for children’s development. While it can support learning, research links heavy screen use to difficulties with skills children rely on every day. These include paying attention, managing frustration, and communicating with others.

A 2025 study found that Canadian preschoolers aged 3.5-5.5 who averaged 3-6 hours of daily screen use scored significantly lower on inhibitory control and effortful control at age 5.5 than children in the group averaging less than an hour.

Inhibitory and effortful control help children:

  • Resist impulses
  • Direct their attention
  • Regulate their behavior

These skills are essential when a child needs to wait their turn, listen to instructions, or keep working at a task after something goes wrong. If a child carries these struggles into adulthood, it may be much harder to meet deadlines, manage responsibilities, and navigate disagreements at work or in relationships.

A 2024 study of 220 Australian families also linked more screen time to fewer adult words, child vocalizations, and back-and-forth conversations. That leaves fewer opportunities for children to practice asking questions, explaining how they feel, and telling you what they need. 

As a result, children may be missing out on valuable practice in making themselves understood, which can linger into adulthood. 

Technology, attention, and independent thinking

A 2023 study tracking the smartphones of 203 U.S. children ages 11-17 found that participants got 237 notifications a day on average, and nearly 25% of those arrived during school hours. 

While kids didn’t see or answer every notification immediately, this gives you an idea of how many reasons children have to look up from studying or engaging in their lives on a daily basis.

This and the prevalence of short-form, fast-paced content like TikTok and Instagram Reels may be two reasons attention spans appear to be getting shorter. In fact, according to researcher and author of Attention Span: A Groundbreaking Way to Restore Balance, Happiness and Productivity, Gloria Mark, overall attention spans have decreased from 2.5 minutes to 47 seconds over the past couple of decades.

This doesn’t mean children’s brains have lost the ability to focus for longer periods. However, growing up with fast-moving technology conditions them to read hastily and “skim” text as opposed to reading and comprehending it thoroughly. And it means their brains need to work that much harder to maintain focus. 

So it makes sense that, according to the 2023 National Assessment of Educational Progress (NAEP), just 14% of 13-year-olds read for fun almost every day. That number dropped from 27% in 2012. NAEP Long-Term Trend Assessment Results: Reading and Mathematics

Alarmingly, the NAEP’s 2024 report also found that 33% of U.S. eighth graders scored below the Basic reading level–the largest share on record. 

Research has linked reading for pleasure in early life with better attention, memory, academic achievement, and fewer mental health problems in adolescence. If children can’t or won’t read, they miss out on these benefits.

Technology, social media, and children’s mental health

Your child’s emotional health may also be at stake. Numerous studies have linked social media use to higher levels of depression and poor self-perception–especially in early adolescence, when a child’s sense of self is still taking shape.

Problematic social media use can also cut into sleep time. Over time, this can make it significantly harder for a child to regulate their emotions, and may even double their risk of depression. 

What’s more, in another WHO report involving Europe, central Asia, and Canada, 15% of adolescents said they had experienced cyberbullying. This may lead to higher levels of anxiety, and potentially even self-harm and suicidal thoughts or behaviors. 

Of course, this doesn’t guarantee that your child will develop depression or low-self-esteem by using technology. But it does give parents a reason to look beyond time spent online and to understand how digital experiences leave their child feeling.

Stay connected to your child’s online life

You don’t need to know every platform or read every private message to protect your child. Understanding their online habits can help you recognize when they need help and start meaningful conversations.

Permission is a Family Friendly AI app that gives parents insights into their children’s use of AI and the internet, helping families guide healthier behavior and encourage positive habits through parent-controlled rewards.

Children deserve room to explore, and someone to turn to when online life feels difficult. With a clearer picture of their digital world, you can help make sure they have both.

Your ASK Wallet, Now Powered by Coinbase

Sep 22nd, 2026
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We've partnered with Coinbase to bring best-in-class wallet technology to our community.

Today we're updating the technology that powers your ASK wallet. Here's what's changing, what it means for you, and what stays exactly the same.

What's changing

We've moved your Permission wallet to Coinbase's platform. What that means in plain language is this: starting today, you are in full control of your ASK. When you click to send, redeem, or manage your balance, the transaction happens from your account, signed by your login. We no longer hold your wallet keys. Coinbase does, on your behalf, under your authority.

We chose Coinbase's embedded wallet specifically because it brings institutional-grade security to our users without requiring you to manage anything yourself. The infrastructure is Coinbase's. The wallet is yours.

Beyond the custody change, our users now have a wallet that can go wherever they go: exportable, cross-chain ready, and backed by a platform that serves millions of people around the world. We're proud to bring that to our community.

What it means to control your own keys

As Permission has grown, we felt strongly that your funds should be held by a platform built specifically for that purpose, with the security standards and regulatory rigor that come with it. Moving to Coinbase's embedded wallet reflects that commitment.

With today's change, Coinbase secures your private key inside their systems, and only your Permission login can authorize transactions. When you click to send or redeem ASK, the transaction is authorized by you, through your login. We are no longer part of that process.

What this means practically: your wallet operates on its own, independent of Permission. Treat your Permission login like you would a bank password. It is now the key to your wallet. If you ever want to take your wallet entirely outside of Permission, Coinbase supports key export and that option is yours.

What Coinbase sees

Because Coinbase is now part of the infrastructure, your email address, account identifier, and wallet information are shared with them for the purpose of operating the wallet. For details on how Coinbase handles this data, you can review their embedded wallet documentation and their privacy information.

For how Permission handles your data, our Terms of Use and our Privacy Policy govern that relationship, as they always have.

What stays the same

Everything you experience in the app. Earning ASK, redeeming it, transferring it, viewing your balance, managing your family. None of that changes.

And, what does change, we're excited about: key export, cross-chain support, and institutional-grade security. These are capabilities that would have taken years to build in-house and that Coinbase has spent that time perfecting. We chose to partner with the best-in-class, and our product and users will be better for it.

If you have questions, support is always here.

The Permission Team 🤝