<center>Part 3 of a series on using L2s with the <a href="https://apps.apple.com/app/apple-store/id6443944476?pt=123625782&ct=Scaling-Summer-Polygon&mt=8">Uniswap wallet</a></center>

This summer, Ethereum [scaling solutions](https://blog.uniswap.org/uniswap-scaling-summer) have exploded in popularity. After years of research and development, Ethereum has a thriving ecosystem of Layer 2 (L2) networks, applications, and users. The Uniswap Protocol is deployed across a number of these L2s and the [Uniswap wallet](https://apps.apple.com/app/apple-store/id6443944476?pt=123625782&ct=Scaling-Summer-Optimism&mt=8) currently supports 4 of them, in addition to mainnet, with more coming.

Last month, we dug into [Arbitrum](https://blog.uniswap.org/scaling-summer-arbitrum) and [Optimism](https://blog.uniswap.org/scaling-summer-optimism). Today, we're checking out Polygon. Polygon's original Proof-of-Stake (PoS) chain was launched in 2017 and has over [350,000](https://tokenterminal.com/terminal/metrics/user-dau) daily active users (DAU) transacting over 2 million times every day. This puts Polygon PoS as the most popular scaling solution on Ethereum today.

Uniswap [launched on Polygon PoS](https://twitter.com/Uniswap/status/1473754630173638663) in December 2021 as the fourth chain after Ethereum mainnet, Optimism, and Arbitrum. Uniswap started 2022 with just $2 billion in cumulative trading volume on Polygon PoS and ended with over $28B by the [end](https://twitter.com/0xPolygonLabs/status/1610683710008852481). This year, that number stands at $47.35B, making Uniswap the [leading liquidity protocol](https://defillama.com/dexs/chains/polygon) on Polygon PoS, processing over $215M in trading volume over the past 7 days.

Because swaps cost only [1 cent](https://tokentool.bitbond.com/gas-price/polygon), Polygon PoS is a popular destination for inexpensive onchain activity. The Uniswap wallet [fiat-on-ramp](https://blog.uniswap.org/web-fiat-on-ramp) makes it easier for swappers to fund their [wallets](https://apps.apple.com/app/apple-store/id6443944476?pt=123625782&ct=Scaling-Summer-Polygon&mt=8) directly on Polygon PoS.

![image1](//images.ctfassets.net/oc3ca6rftwdu/7gdTKzhf73Rspxq1cO9v6h/ebef7afdd30c364210e8c6f3ad399023/image1.png)
<center><a href="https://defillama.com/dexs/uniswap">Daily Uniswap volume on Polygon</a></center>

Most L2 networks focus on a single chain but Polygon refers to a family of interconnected chains that address specific needs within the broader Ethereum ecosystem. Polygon PoS is the most popular chain, but there is also [Polygon Miden](https://polygon.technology/polygon-miden) and [Polygon zkEVM](https://polygon.technology/polygon-zkevm). Both are zero-knowledge (ZK) rollups that use cryptography to secure transactions as opposed to Optimism, Arbitrum, and Base, which use crypto-economic incentives. In general, ZK rollups offer greater security guarantees and much faster finality than optimistic rollups, though their increased complexity requires careful development and powerful hardware.

A few months ago, Polygon announced its plans for [Polygon 2.0](https://polygon.technology/roadmap) to unify Polygon PoS, zkEVM, and Miden with ZK technology. This will be the first experiment of its kind in crypto and a major undertaking to navigate challenges around centralization, interoperability, and security.

Multi-chain ecosystems are difficult to navigate; users have to fiat onramp, bridge between networks, and manage their funds. A successful migration to Polygon 2.0 would ease many of the UX problems that Polygon users currently face, but users still need a feature-rich wallet to interact onchain. At Uniswap Labs, we've built our [self-custodial wallet](https://apps.apple.com/app/apple-store/id6443944476?pt=123625782&ct=Scaling-Summer-Polygon&mt=8) as a friendly gateway into the Polygon ecosystem and other L2s with a direct fiat-on-ramp, seamless switching between mainnet and L2s, and WalletConnect for any app on Polygon.

---

*Uniswap is encouraging users to go onchain and explore L2s as part of #ScalingSummer. To join our educational quests, click [here](https://layer3.xyz/quests/swap-on-polygon-using-uniswap-wallet).*

Learn more about Uniswap's activity on Polygon as part of our ongoing series on the Uniswap wallet and L2s.

Scaling Summer: Spotlight on Polygon

<center>Part 2 of a series on using L2s with the <a href="https://apps.apple.com/app/apple-store/id6443944476?pt=123625782&ct=Scaling-Summer-Optimism&mt=8">Uniswap wallet</a></center>

This summer, Ethereum [scaling solutions](https://blog.uniswap.org/uniswap-scaling-summer) have exploded in popularity. After years of research and development, Ethereum has a thriving ecosystem of Layer 2 (L2) networks, applications, and users. The Uniswap Protocol is deployed across a number of these L2 and the [Uniswap wallet](https://apps.apple.com/app/apple-store/id6443944476?pt=123625782&ct=Scaling-Summer-Optimism&mt=8) currently supports 4 of them, in addition to mainnet, with more coming.

A few weeks ago, we dug into the [Arbitrum](https://blog.uniswap.org/scaling-summer-arbitrum) with the Uniswap wallet. Today, we're checking out Optimism. Optimism Mainnet is an Optimistic rollup with over [100,000](https://dune.com/queries/469990/890729) daily active users (DAU) transacting over [600,000](https://dune.com/queries/347720/662079) times every day. Many of these DAUs are active in the DeFi and NFT ecosystems -- not just on Uniswap, but on projects like Synthetix and Zora.

Before Optimism was ready for mainnet, Uniswap worked with their team in 2019 (then called the Plasma Group), on a project called [Unipig](https://twitter.com/unipigexchange) -- a custom-built rollup for Uniswap that highlighted the UX benefits of L2s. Unipig was an optimistic rollup experiment designed to speed up L2 development with a proof-of-concept of a lightning-fast and cheap dapp on a rollup. Unipig was successful in showing what the future of UX could be. Two years later, Uniswap [launched](https://blog.uniswap.org/uniswap-optimism-alpha) on Optimism Mainnet.

Uniswap is now the [leading liquidity protocol](https://defillama.com/dexs/chains/optimism) on Optimism, processing over 75% of all swapping volume in the past 7 days at $128M. These swaps are [5-10%](https://www.growthepie.xyz/fundamentals/transaction-costs) of the cost of mainnet swaps, making Optimism a popular destination for inexpensive onchain activity. The Uniswap wallet makes it easy for swappers to fund their wallets directly on Optimism with our fiat-on-ramp.

![image1](//images.ctfassets.net/oc3ca6rftwdu/3HlrbvTjmmZuhiZWx0KYBv/1e8e548b629a4201f17ad2e4595e242e/image1.png)
<center><a href="https://defillama.com/dexs/uniswap">Daily Uniswap volume on Optimism</a></center>

Optimism Mainnet is built using the [OP Stack](https://stack.optimism.io/), a combination of open-source technologies that power the Optimism mainnet. Developers can use the OP Stack to securely create new L2 blockchains that are interoperable with any other blockchains deployed with the OP Stack. This is Optimism's future vision of the [Superchain](https://app.optimism.io/superchain), a horizontally scalable network of chains that share security, a communication layer, and an open-source development stack.

The Superchain is Optimism's solution to an increasingly fragmented L2 ecosystem. The OP Stack standardizes L2s, making it easier to communicate across them. This standardization has downstream benefits too. Apps that are deployed on Optimism can quickly deploy onto any OP Stack chain. For example, Coinbase's Base chain was [built](https://base.mirror.xyz/H_KPwV31M7OJT-THUnU7wYjOF16Sy7aWvaEr5cgHi8I) using the OP Stack. Because Uniswap was already on Optimism, which used the OP Stack, we could quickly [deploy](https://twitter.com/Uniswap/status/1688581784609435648) on Base. This quick deployment meant swappers could reliably swap on a battle-tested and efficient market, making Uniswap the number one [liquidity protocol](https://defillama.com/dexs/chains/base) on Base.

Of course, this tech -- like much of web3 -- is still evolving. Centralized operations that create a better UX face questions about decentralization. Bridging technologies on every L2 face security risks that are still being addressed. And while more experimentation can lead to better outcomes, it also risks ecosystem fragmentation. But across all of DeFi, we must continue to iterate to improve the experience for both new and long-time users.

---

*Uniswap is encouraging users to go onchain and explore L2s as part of #ScalingSummer. To join our educational quests, click [here](https://layer3.xyz/quests/swap-on-optimism-using-uniswap-wallet).*

Learn more about Uniswap's activity on Optimism as part of our ongoing series on the Uniswap wallet and L2s.

Scaling Summer: Spotlight on Optimism

<center>Part 1 of a series on using L2s with the <a href="https://apps.apple.com/app/apple-store/id6443944476?pt=123625782&ct=Scaling-Summer-Arbitrum&mt=8">Uniswap wallet</a></center>

Scalability is an important property of blockchains. It measures how many transactions a blockchain can process, how quickly, and how cheaply. You've likely experienced scaling limitations --- paying high gas fees or waiting for your swap to execute.

Years of hard work researching different scaling solutions have laid the foundation for a thriving ecosystem of applications, users, and activity on these networks. This summer, Ethereum scaling solutions have exploded in popularity and usage. After years of research and development, Ethereum has a thriving ecosystem of Layer 2 (L2) networks, applications, and users.

The Uniswap Protocol is deployed across a variety of different chains and the [Uniswap wallet](https://apps.apple.com/app/apple-store/id6443944476?pt=123625782&ct=Scaling-Summer-Arbitrum&mt=8) currently supports 4 chains in addition to mainnet with more coming. Today we're going to dig into Arbitrum -- which was launched in 2021 by the Offchain Labs team and was the first L2 to deploy the Uniswap Protocol.

Uniswap is the [leading liquidity protocol](https://defillama.com/dexs/chains/arbitrum) on Arbitrum, processing over 50% of all swapping volume in the past 7 days at $675M. These swaps can be up to 22x [cheaper](https://l2fees.info/) on Arbitrum than mainnet, making Arbitrum a popular destination for inexpensive onchain activity. The Uniswap wallet makes it easy for swappers to fund their wallets directly on Arbitrum with our fiat-on-ramp.

![image1](//images.ctfassets.net/oc3ca6rftwdu/2lSlQeLwWVC6s3z7V2RYHb/783c03249c87b5d58e3a02940ff835df/image1.png)
<center><a href="https://defillama.com/dexs/uniswap">Daily Uniswap volume on Arbitrum</a></center>

[Arbitrum One](https://portal.arbitrum.io/?chains=arbitrum-one) is an Optimistic rollup and is the Arbitrum crypto ecosystem's flagship chain with over [150,000 daily active users](https://tokenterminal.com/terminal/projects/arbitrum) (DAUs) -- a 5x increase between 2022 and 2023. It derives its execution finality from the Ethereum mainnet by posting data to the Ethereum mainnet. This data is used to verify that the transactions on Arbitrum have been processed correctly.

Offchain Labs has also shipped [Arbitrum Nova](https://portal.arbitrum.io/?chains=arbitrum-nova), the first AnyTrust chain on mainnet that shares the same codebase as Arbitrum One, but does not rely on Ethereum for execution finality and allows for higher throughput and lower transaction fees. This makes it a powerful technology for social and gaming use cases. [Arbitrum Orbit](https://arbitrum.foundation/orbit) is a permissionless solution to deploy a fully customized Layer 3 chain that settles to one of Arbitrum's public L2 chains, like Arbitrum One or Nova.

While Arbitrum has seen significant user growth, it's still far less than the[ 313,000 DAUs on mainnet](https://tokenterminal.com/terminal/projects/ethereum) -- underscoring one of the biggest hurdles facing Arbitrum and all L2s is adoption. To help developers to integrate with L2s on the back end, the Offchain Labs team is working on [Stylus](https://offchain.medium.com/hello-stylus-6b18fecc3a22) to let developers deploy programs in their preferred languages, like Rust, C, and C++, alongside Solidity on Arbitrum.

But the backend is only half the battle. We need a better UX, like the Uniswap wallet. The wallet's fiat-on-ramp will onboard new users directly to various L2s including Arbitrum, skipping the confusing process of onramping to a CEX and then bridging to Arbitrum. Once they're on Arbitrum, the Uniswap wallet's WalletConnect feature will let them connect and swap on Arbitrum without having to switch networks. With the [Uniswap wallet](https://apps.apple.com/app/apple-store/id6443944476?pt=123625782&ct=Scaling-Summer-Arbitrum&mt=8), users have the perfect tool to explore the Arbitrum ecosystem.

---

*Uniswap is encouraging users to go onchain and explore L2s as part of #ScalingSummer. To join our educational quests, click [here](https://twitter.com/Uniswap/status/1691175948186701824).*

Learn more about Uniswap activity on Arbitrum as part of our ongoing series on the Uniswap wallet and L2s.

Scaling Summer: Spotlight on Arbitrum

Ethereum's scaling solutions have captured everyone's attention this summer. Optimism's Bedrock update lays the groundwork for custom scaling networks. Polygon 2.0 unifies all Polygon protocols. The Boojum upgrade lowers the hardware barrier to help secure zkSync. And, of course, Base launched! Around the world, developers, hackers, and researchers are pouring hundreds of hours into the same problem: What's the best way to scale Ethereum?

Projects and developers are preparing crypto for the next wave of user adoption. Now that we have cheap transactions and the speed to compete with traditional financial rails, the crypto-curious will spend more time on Optimism, Arbitrum, Base, and Polygon than Ethereum itself.

For the next few weeks, we'll explore each of these chains, including some onchain activities and prizes. We'll learn about the technology, popular applications, and community using the [Uniswap wallet.](https://apps.apple.com/app/apple-store/id6443944476?pt=123625782&ct=Scaling-Summer&mt=8)

# How scaling solutions help Ethereum
Scalability is an important property of blockchains. It measures how many transactions a blockchain can process, how quickly, and how cheaply. You've likely experienced scaling limitations --- paying high gas fees or waiting for your swap to execute.

Years of hard work researching different [scaling solutions](https://ethereum.org/en/developers/docs/scaling/) have laid the foundation for a thriving ecosystem of applications, users, and activity on these networks. Together, Ethereum scaling solutions have made the crypto UX much [cheaper](https://l2fees.info/) and [faster](https://l2beat.com/scaling/activity), processing hundreds of millions in [daily volume](https://defillama.com/chains).

Currently, most scaling solutions are implemented as [rollups](https://www.coindesk.com/learn/what-are-rollups-zk-rollups-and-optimistic-rollups-explained/). These rollups increase transaction throughput by producing faster blocks, bundling these transactions, and then sharing them with the Ethereum mainnet -- all while sharing Ethereum's security properties.

You can think of rollups like opening a tab. Instead of paying for items you order individually, you can bundle your purchases and pay for them all at once when you close out your tab. A rollup is like a tab. It bundles multiple transactions at once. When it's time to close out, you settle your bill with the restaurant's payment processor, just like rollups settle their transactions on the Ethereum network. Optimism, Arbitrum, Base, and Polygon 2.0 are examples of rollups.

# Exploring Polygon, Optimism, Base, and Arbitrum
Scaling solutions are a key part of Ethereum's [future](https://ethereum-magicians.org/t/a-rollup-centric-ethereum-roadmap/4698). Getting familiar with them will upskill your onchain experience --- and we can help. This summer, we'll deep dive into Arbitrum, Polygon, Base, and Optimism and partner with these projects to help you better understand and navigate this space. We'll see how easy it is to use the Uniswap wallet and play with these scaling networks at low costs with the simplicity you've come to expect from Uniswap.

To get started, download the [Uniswap wallet](https://apps.apple.com/app/apple-store/id6443944476?pt=123625782&ct=Scaling-Summer&mt=8) and follow us on [Twitter](https://twitter.com/uniswap) for more updates!

It’s Scaling Summer at Uniswap. Join us as we go onchain with Polygon, Arbitrumn, Optimism, and Base.

What Scaling Ethereum Means For you

A few weeks ago, we [announced](https://blog.uniswap.org/uniswap-mobile-wallet-early-access) the Uniswap [mobile wallet](https://apps.apple.com/app/apple-store/id6443944476?pt=123625782&ct=Announcement%20Blog&mt=8) --- the safest and simplest self-custody wallet in Web3. The Uniswap wallet has [grown](https://twitter.com/haydenzadams/status/1653807959024054277) to tens of thousands of swappers as a top wallet in the iOS app store. Feedback has been overwhelmingly positive as people appreciate the friendly design, security, and swap UI.

You need a wallet to do just about anything onchain --- [swap](https://app.uniswap.org/#/swap), [buy NFTs](https://blog.uniswap.org/uniswap-nft-aggregator-announcement), and [purchase crypto](https://blog.uniswap.org/web-fiat-on-ramp). So we wanted to share a few reasons why you'll love using the Uniswap wallet to trade tokens, collect NFTs, and navigate Web3.

# 1. The best swap experience
When it comes to swapping, Uniswap is the [gold standard](https://twitter.com/dhadrien_/status/1646617605124558848). The iOS wallet brings our swap experience to a native mobile app that feels fast and fresh.

You can trade any token available on Uniswap across multiple chains: Ethereum, Polygon, Optimism, Arbitrum. To trade on an L2 network, simply select an L2 token and the swap form will instantly fetch a quote on that network. The wallet will authorize the transaction using Face ID or Touch ID and then, once the swap settles onchain, you’ll receive a real-time push notification for the completed swap.

<Video source="//videos.ctfassets.net/oc3ca6rftwdu/62Bv8LZVhW3Dadb9lsQFet/aa60908e17e8f6592bb14743fe4036bc/Swapping_-_Compressed.mp4" description="Swapping on the Uniswap mobile wallet." />

# 2. Search Web3
You can search for any token, NFT collection, ENS name, or wallet address. It’s the easiest way to discover new wallets and assets. 

Token search displays important information like swapping volume, market cap, and historical price activity. NFT search reveals floor prices, trading volume, and collection details to help you find the perfect NFT. Wallet search lets you explore the activity and assets of another wallet. 

When you find yourself frequently checking a token or wallet, you can favorite it for easy access. The Uniswap wallet is a great tool for exploring Web3 on the go.

![image2](//images.ctfassets.net/oc3ca6rftwdu/36vXUIcKh3uM8J9knxf9OS/ae99567fd83c01ed2b694785f56a00da/image2.png)

# 3. Explore NFT collections
Uniswap wallet is the best way to find the perfect NFT.

Not only can you search for NFTs – you can browse every item in a collection. You’ll find the artwork, floor price, and 24hr volume on the collection page. If an NFT catches your eye, you can click in to see the last sale price and current owner. From there you can hop into the owner’s profile to see what other NFTs they own. 

![Untitled (1) (1)](//images.ctfassets.net/oc3ca6rftwdu/7yFDPDhfTiaWH6IPnj5w4H/28a2c42102fa3cf7a6cf06a6ec2ea6cd/Untitled__1___1_.png)

# 4. WalletConnect to multiple apps simultaneously
WalletConnect allows you to connect with other web3 apps in a browser. What makes the Uniswap wallet unique is that you can connect to multiple apps on different chains at the same time.

In other words, you can use Lido on Ethereum mainnet, Aave on Polygon, and Uniswap on Arbitrum without switching between networks or disconnecting. If you want to disconnect, you can manage all your app connections in the settings page.

<Video source="//videos.ctfassets.net/oc3ca6rftwdu/5Q8IdS7WOFBvu5EybDfbSy/6161d2459cebd18b612bf121c2980879/WalletConnect_Compressed.mp4" description="WalletConnect in the Uniswap wallet." />

# 5. Spam filtering and safety warnings
There are a lot of tokens out there, but they're not equally reputable or safe. The Uniswap wallet protects you through spam filters and safety warnings.

By default, Uniswap wallet applies a spam filter to 'hide' unknown tokens in your portfolio. This is useful to declutter spam airdrops that you didn't purchase and let you focus on the tokens you chose to buy. Don't worry though, you're still in full control and can see every token in your wallet, including spam,  in the 'Hidden' section. You can un-hide those tokens by turning off the 'Unknown tokens' toggle in Settings.

Token [warning labels](https://support.uniswap.org/hc/en-us/articles/8723118437133-What-are-token-warnings-) also help you make safe and informed decisions while trading or browsing tokens. The Uniswap wallet will label lesser-known tokens with a yellow or red label when appropriate. This is a sign for you to research before trading a token.

***

These five features are just the tip of the iceberg that is the Uniswap mobile wallet. There's so much left to discover, like the fiat onramp, iCloud backup, [open source repo](https://github.com/Uniswap/wallet), and more.

Get Uniswap in your pocket by downloading it from the [app store](https://apps.apple.com/app/apple-store/id6443944476?pt=123625782&ct=Announcement%20Blog&mt=8), and share your feedback on [Discord](https://discord.gg/FCfyBSbCU5).

People love the Uniswap wallet. Learn about their favorite features, from the smooth swap experience to NFT collections.

Five Reasons You’ll Love the Uniswap Wallet

We're excited to announce that you can now go directly to DeFi with the Uniswap mobile wallet! You can [download it here](https://apps.apple.com/app/apple-store/id6443944476?pt=123625782&ct=Announcement%20Blog&mt=8) in the iOS App Store.

<Video source="//videos.ctfassets.net/oc3ca6rftwdu/2KBRzdKFKccWggi2xBlO4H/a82234fea0770e5e910179ed0bb64e4f/MW__1_.mp4" description="Uniswap Wallet GA Release Video" />

The Uniswap mobile wallet is the easiest way to trade tokens on the go. Our thousands of early access users love it. Starting today anyone can:
- Seamlessly swap on Mainnet, Polygon, Arbitrum, and Optimism
- Discover top tokens by market cap, price charts, and volume
- Favorite tokens and wallet addresses to stay up to date on trends and activity
- Connect to any app on Mainnet or L2s with WalletConnect
- See NFT details like floor price, owner, and collection description
- Choose your security method with manual or encrypted iCloud backups
- Get notified of any onchain activity with push notifications
- [Buy crypto](https://support.uniswap.org/hc/en-us/categories/11302011603341-Buying-Crypto) using fiat with fees as low as 2.55%, vs. 5% on other popular wallets

![Mobile FOR](//images.ctfassets.net/oc3ca6rftwdu/6OvJvSO5WoYHCncQhIq0DN/83f44584d7067d75955044852c3d9e0c/FOR__1_.png)

# Safe, simple swapping & self-custody
You need a self custodial wallet to do just about anything onchain --- [swap tokens](https://app.uniswap.org/), [buy NFTs](https://uniswap.org/blog/uniswap-nft-aggregator-announcement), [purchase crypto](https://uniswap.org/blog/web-fiat-on-ramp), or use apps. Self-custody makes DeFi safer and ensures your crypto can't be misused by a centralized party. But too many people get stuck at the starting line. We get thousands of user support tickets from Uniswap Web App users confused by wallets. So, we're proud to bring you a self-custodial wallet that is simple, safe, and easy to use.

As the most trusted team in DeFi, we're obsessed with security. After a thorough [security audit](https://github.com/trailofbits/publications/blob/master/reviews/UniswapMobileWallet-securityreview.pdf) from Trail of Bits, we [open-sourced](https://github.com/Uniswap/wallet) the mobile wallet so you can review the code yourself.

Creating your wallet should be as easy as creating an email address - now it is with Uniswap mobile wallet.

# How do I get my wallet?
Apple approved the wallet for use globally.

Our early access TestFlight users can head to the [iOS App Store](https://apps.apple.com/app/apple-store/id6443944476?pt=123625782&ct=Announcement%20Blog&mt=8) to download the app --- all the information and wallets you've loaded to the TestFlight version will automatically migrate.

Check out our Help Center content if you have questions: 

- [How to create a wallet, import recovery phrases, add new wallets, and more](https://support.uniswap.org/hc/en-us/sections/11302111085709)
- [How to protect my recovery phrase, recover from iCloud, and more](https://support.uniswap.org/hc/en-us/sections/11302223905677)
- [How to swap, bridge to L2s, connect via WalletConnect, and more](https://support.uniswap.org/hc/en-us/sections/11302165059213)

As always, share your feedback with us on [Discord](https://discord.gg/FCfyBSbCU5)!

The Uniswap mobile wallet is live on the iOS App Store! Download our self-custodial wallet and experience Web3 with simplicity, safety, and security.

Uniswap Wallet is available now

The [Uniswap mobile wallet](https://blog.uniswap.org/uniswap-mobile-wallet-release) is a self-custodial wallet that is simple, safe, and easy to use. Now that it's out, we wanted to give you a behind-the-scenes look at our design principles, why we [open sourced](https://github.com/Uniswap/wallet) it, and how we think about security and privacy.

# Open Source
We open sourced the [Uniswap mobile wallet](https://github.com/Uniswap/wallet) for a few reasons:
- **Open Source is User Aligned:** Users have a right to choose the product that is best for them. Instead of trusting our claims about security, privacy, and data retention, users should be able to validate these claims by directly viewing the source code. Open source products allow users to evaluate their options to the greatest extent possible.
- **Open Source Builds Trust:** The Uniswap mobile wallet has been audited by multiple parties, including [Trail of Bits](https://github.com/trailofbits/publications/blob/master/reviews/UniswapMobileWallet-securityreview.pdf). These security reviews build trust in the safety of our products. Open sourcing takes this [one step further](https://dwheeler.com/secure-programs/Secure-Programs-HOWTO/open-source-security.html). By exposing our codebase to the public forum, security researchers can further vet our wallet.
- **Open Source is Collaborative:** When we started building the wallet, there weren't many open sourced wallets to learn from. By publishing our code, the Uniswap mobile wallet becomes a reference for other builders.

We've open sourced the entire wallet, including code that touches private keys, seed phrases, and on-chain data. You can inspect our repo, but some noteworthy code includes [key management](https://github.com/Uniswap/wallet/blob/main/ios/RNEthersRS.swift), [iCloud backup](https://github.com/Uniswap/wallet/blob/main/ios/RNICloudBackupsManager.swift), arbitrary transaction signing using [WalletConnect](https://github.com/Uniswap/wallet/blob/main/src/features/walletConnect/saga.ts#L289), [token swaps](https://github.com/Uniswap/wallet/blob/main/src/features/transactions/swap/swapSaga.ts) on multiple chains, viewing [NFTs](https://github.com/Uniswap/wallet/blob/main/src/components/images/NFTViewer.tsx), and various [UI components](https://github.com/Uniswap/wallet/tree/main/src/components).

# Security
We had two goals that informed the mobile wallet design principles:
1. Protect the user's wallet from being drained by securely storing and accessing the seed phrase
2. Protect the user from losing wallet access with backup options

### Seed Phrase Storage
Seed phrases and private keys stored on local devices use a combination of [iOS Keychain](https://support.apple.com/guide/security/keychain-data-protection-secb0694df1a/1/web/1) and [Secure Enclave](https://support.apple.com/guide/security/secure-enclave-sec59b0b31ff/web) to maximize security.

Apple built the iOS Keychain as a SQLite database that securely stores secrets, like passwords, certificates, and private keys. Some unique properties of the Keychain include:
- Items are encrypted using two AES-256-GCM keys: A table key and per-row key
- Items never leave your device
- Items cannot be shared between applications
- Items do not sync to the iCloud keychain

Keychain items are encrypted using 256-bit keys stored in Apple's [Secure Enclave](https://developer.apple.com/documentation/security/certificate_key_and_trust_services/keys/protecting_keys_with_the_secure_enclave), a dedicated hardware-based key manager isolated from the main processor.

Decrypting data within the Keychain requires a round trip through the Secure Enclave adding an extra layer of security. If the iOS keychain or application processor is compromised, Uniswap mobile wallet keychain items remain encrypted because the encryption key is kept in a hardened hardware module separate from the main processor. iOS Keychain and Secure Enclave are Apple implementations and are not specific to our wallet.

![storage](//images.ctfassets.net/oc3ca6rftwdu/2jxQoIK1lsIIKJtUgCkbsJ/1b62682ce2fdd508747debcdfb3a5084/storage.jpeg)

### Accessing Private Keys & Seed Phrases
The Uniswap mobile wallet accesses seed phrases and private keys to
1. Display the seed phrase on-screen
2. Create signatures

To display items on-screen, we use a native [UI component](https://github.com/Uniswap/wallet/blob/main/ios/RNEthersRS.swift) written in Swift to fetch and display the seed phrase from the secure iOS Keychain.

The flow for creating signatures is more extensive. When the wallet has a message or transaction to sign, it is sent from React Native to Swift. The wallet's private key is securely fetched from the iOS keychain, and the `ethers-rs-mobile` [library](https://github.com/Uniswap/ethers-rs-mobile) - written in Rust - generates the signature. The valid signature is passed back through Swift and Javascript to execute transactions.

To further protect these sensitive user flows, you can enable biometric authentication via Face ID or Touch ID. Whenever you attempt to view your seed phrase or sign a transaction, you will be prompted to complete biometric authentication.

We compiled the `ethers-rs` [library](https://github.com/gakonst/ethers-rs) written in Rust to an iOS-compatible [version](https://github.com/Uniswap/ethers-rs-mobile) in C++, `ethers-rs-mobile`, giving us performance and security benefits with key derivation and signing functions. While React Native is fantastic for mobile app development, Javascript is susceptible to supply chain attacks from upstream dependencies. The `ethers-rs-mobile` library ensures that wallet seed phrases and private keys never touch Javascript code.

### Backups
All self-custodial wallets come with manual backups, encouraging users to write down their seed phrase for later recovery. But if a user loses their phone without a manual backup, they will lose access to their wallet. That’s why the Uniswap mobile wallet offers two recovery methods:
1. Manual seed phrase
2. iCloud backup

Users can manually back up their seed phrase by viewing it during the onboarding flow or by revealing it in-app after passing an authentication check. They are encouraged to physically write it down. We strongly recommend Face ID as the strongest authentication treatment.

iCloud recovery is optional but highly recommended for those new to crypto. When a user chooses the iCloud backup,  we require a user password to encrypt the seed phrase before storing it in iCloud. This way, even if a user's iCloud account is compromised their wallet is still protected. 

The seed phrase is locally encrypted using Apple's [AES.GCM](https://developer.apple.com/documentation/cryptokit/aes/gcm) cipher suite with a key derived from the user password using the [Argon2](https://datatracker.ietf.org/doc/rfc9106/) key derivation function. Even in this flow, sensitive data like the encryption key does not touch Javascript.

![store](//images.ctfassets.net/oc3ca6rftwdu/6bRWbgLqIhHFFRUk9dXRjy/451d0b955a2e7769629251bdca3183a0/store.jpeg)

To restore a wallet from iCloud backup, users must be logged into their iCloud account and enter the password they used to encrypt their seed phrase.

![restore](//images.ctfassets.net/oc3ca6rftwdu/IWsfxxt7brLPQWjVrXwQ7/31d50cba7590e0f2e529378dcb4264fe/restore.jpeg)

This additional encryption mechanic maximizes security while still supporting an intuitive and familiar backup experience.

# Privacy
Uniswap Labs **does not** keep any information that allows us to identify individuals. We do not store first name, last name, street address, date of birth, email address, or IP address in any of our products, including our mobile wallet.

Anything we keep is confined to on-chain data and very limited off-chain data like device type and browser version, which allows us to troubleshoot errors and improve products for our users. None of this data is identifiable.

The Uniswap mobile wallet uses APIs like Infura, OpenSea, Covalent, TRM, and more. Many of these APIs help us serve data to the user, like token prices, NFT data, and on-chain activity. Most requests sent to these APIs are proxied through a Uniswap Labs server that removes and deletes IP addresses. A handful of API calls sent to Infura are direct, which includes IP. We are actively working to obfuscate non-proxied API calls.

# Download the mobile wallet!
As of this blog post, the Uniswap mobile wallet is [waiting for App Store approval](https://www.coindesk.com/business/2023/03/03/uniswap-wants-to-launch-crypto-wallet-app-but-apple-says-not-so-fast/). In the meantime, we have released the mobile wallet on TestFlight. We'll periodically release access links on [Twitter](https://twitter.com/uniswap), so please watch our feed. You can also learn more about the wallet features in our [announcement post](https://uniswap.org/blog/uniswap-mobile-wallet-early-access) and dive into the [wallet repo](https://github.com/Uniswap/wallet).

If you have any questions or feedback, please join [Discord](https://discord.gg/FCfyBSbCU5) and ask!

*Update (April 13th, 2023): The Uniswap mobile wallet GA release was cut. Download it from the [App Store](https://apps.apple.com/app/apple-store/id6443944476?pt=123625782&ct=Announcement%20Blog&mt=8).*

Uniswap engineers give a behind the scenes look at how we built the Uniswap mobile wallet, with a focus on security architecture, open source principles, and privacy considerations.

A Technical Overview of the Uniswap Mobile Wallet

You need a wallet to do just about anything on-chain - [swap](https://app.uniswap.org/), [buy NFTs](https://blog.uniswap.org/uniswap-nft-aggregator-announcement), and [purchase crypto](https://blog.uniswap.org/web-fiat-on-ramp). But too many people get stuck at the starting line. We get thousands of user support tickets from Uniswap Web App users that boil down to confusion about self-custody wallets. Self-custody is a core tenet of DeFi and ensures your crypto can't be misused by a centralized party. So, we're proud to bring you a self-custodial wallet that is simple, safe, and easy to use.

<Video source="//videos.ctfassets.net/oc3ca6rftwdu/7jS48sWP4lCCx2YwJvwPMd/9a7151c576e9db420c86855ae0f5f9a0/ML.mp4" description="Mobile Wallet Early Release" />

Starting today, we're sharing early access so you can:

- Trade tokens directly with the most trusted DeFi protocol
- Seamlessly switch between Mainnet, Polygon, Arbitrum, and Optimism
- Discover top tokens by market cap, price charts, and volume
- Favorite tokens and wallet addresses to stay up to date on trends and activity
- WalletConnect to any app on Mainnet or L2s
- Back up your seed phrase on iCloud or manually
- Get notified when transactions complete - on any device - with push notifications
- And, it's completely [open-sourced](https://github.com/Uniswap/wallet)

The swap experience you know and love now fits in your pocket. Creating your wallet should be as easy as creating an email address -- and now it is with Uniswap mobile wallet.

## A self-custody mobile wallet from the most trusted name in DeFi

The Uniswap mobile wallet is the easiest way to trade tokens on the go. You can check price charts, search for any token, and seamlessly swap on L1 or L2 networks without needing to configure or switch networks! When your transaction completes, you'll receive a push notification in real-time.

![swap (1)](//images.ctfassets.net/oc3ca6rftwdu/NW076mWTtorURlMf8R0hE/942c4f9ed2d7b81a652e33a4d64b883c/swap__1_.png)

Navigating your favorite apps has become easier too! The Uniswap mobile wallet is the best way to manage your portfolio across Ethereum, Polygon, Arbitrum, and Optimism. Using WalletConnect, you can manage connections to multiple web apps on different networks simultaneously. For example, you can connect to Lido on Mainnet, Aave on Polygon, and Uniswap on Arbitrum without switching networks.

![connect](//images.ctfassets.net/oc3ca6rftwdu/5nLTOXNvPSqhpCN0a2W6RY/5e7ab98afe125a52345027795cb13cfa/connect.png)

To ensure the highest security standard, we worked with Trail of Bits for our [audit](https://github.com/trailofbits/publications/blob/master/reviews/UniswapMobileWallet-securityreview.pdf). Imported and newly created wallets will have their seed phrases and private keys encrypted and stored on devices using Apple's secure enclave, which is excluded from device backups. You can store your seed phrase manually with a paper copy or encrypt and store it on Apple iCloud so that if you lose your phone, your seed phrase is backed up and protected.

![secure](//images.ctfassets.net/oc3ca6rftwdu/615xYkxM8dDevUHs0jSSlb/1ccd08d11d5c49c07f097663231ba545/secure.png)

## Get early access
We'd love to release the Uniswap mobile wallet for everyone on the App Store, but the best we can offer is early access.

Apple approved our first build in October but rejected the final build just a few days before our December launch. Since then, we've responded to their concerns, answered every question, and reiterated that we are 100% compliant with their [guidelines](https://developer.apple.com/app-store/review/guidelines/). Other self-custody swapping wallets have been approved, but Apple won't green-light our launch and we don't know why. We are stuck in limbo.

So instead of waiting alone, we thought it would be more fun to wait together, with a few thousand [Testflight](https://developer.apple.com/testflight/) users. That means it's functionally the same, safe to use, and can be updated to the App Store version after Apple approves it. We like Apple products -- that's why we built our wallet for iOS. But this experience has reminded us why we got into building open, accessible technology in the first place.

We'll roll out access codes across community channels and time zones over the next two weeks, starting at ETHDenver. If you're here, come find us at our booth! Follow us on [Twitter](https://twitter.com/uniswap) and [Discord](https://discord.gg/FCfyBSbCU5) to never miss a drop.

We have so many exciting features in store. But we can't deliver it to everyone until Apple gives us the green light. Follow us on Twitter to get TestFlight access links and download the wallet.

In the meantime, we're working hard to bring the Uniswap wallet to our users on other platforms. Stay tuned!

***

Helpful links to get started:

- [How to use download via TestFlight](https://support.uniswap.org/hc/en-us/sections/13461737519885)
- [How to create a wallet, import recovery phrases, add new wallets, and more](https://support.uniswap.org/hc/en-us/sections/11302111085709)
- [How to protect my recovery phrase, recover from iCloud, and more](https://support.uniswap.org/hc/en-us/sections/11302223905677)
- [How to swap, bridge to L2s, connect via WalletConnect, and more](https://support.uniswap.org/hc/en-us/sections/11302165059213)

Join our [discord](https://discord.gg/FCfyBSbCU5) to give us your feedback!

The Uniswap mobile wallet - available for early access - is a self-custodial wallet created by Uniswap Labs to simply and safely swap, store, and use crypto on Mainnet, Optimism, Arbitrum, and Polygon.