MetaMask Snaps Explained

Summary: MetaMask Snaps are JavaScript plugins that extend your MetaMask wallet's functionalities, enabling interactions with not just Ethereum but also other non-EVM blockchains. They run in a secure, isolated environment to ensure safety. However, since Snaps can be third-party creations, it's crucial to install only from reputable sources. The supported chains are diverse, from Aptos to Bitcoin, with many more applications launched daily.

What is MetaMask Snaps?

MetaMask Snaps serve as plugins that enhance your MetaMask wallet with specialized functions, developed by external programmers. They're not just limited to the Ethereum network, Snaps can also interact with non-EVM (Ethereum Virtual Machine) chains, broadening the range of blockchain ecosystems you can access directly from MetaMask. 

This means you can manage assets, execute transactions, or even utilize smart contracts on various blockchains, all while maintaining a secure and isolated environment within your MetaMask wallet. Snaps are designed to run in a secure, sandboxed environment, ensuring they do not compromise the safety of your MetaMask account.

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How do Snaps Work?

MetaMask Snaps are JavaScript modules that run in secure, isolated iframes to extend the wallet's capabilities. They interact with MetaMask's Snap API, introducing new RPC methods, managing custom assets, and integrating seamlessly into the MetaMask UI. This secure sandboxing ensures that Snaps can only access specific data and features approved by the user.

Once a Snap is installed, it communicates with MetaMask through JSON-RPC calls, which are routed by MetaMask's internal controller architecture. This enables Snaps to provide diverse features like supporting new blockchains or offering decentralized identity services, all while maintaining a unified user experience within the MetaMask environment.

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What Chains Support MetaMask Snaps?

MetaMask Snaps supports a wide range of blockchains and protocols, giving users the flexibility to interact with various ecosystems. Some of the notable chains supported include:

• Mina Protocol via MinaPortal Snap
• NEAR Protocol via @near-snap/plugin
• Cosmos via @leapwallet/metamask-cosmos-snap and @cosmsnap/snap
• Algorand via @algorandfoundation/algorand-metamask-snap
• Bitcoin and other chains like Dogecoin, Litecoin, etc., via ShapeShift Multichain Snap

Additionally, some Snaps focus on decentralized identity, password management, and zero-knowledge-proof technology, such as Masca, EthSign Keychain, and RariMe. For a full list, we recommend checking out the MetaMask Snaps App Store to continue exploring the range of plugins and extensions. 

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How to Deploy a MetaMask Snap

To deploy a MetaMask Snap, you'll need to set up a development environment, write the Snap using JavaScript and MetaMask's SDK, and then test it locally. Once it's working as expected, you'll bundle your Snap into a JavaScript file, upload it to a public server, and configure MetaMask for user installations. 

For a detailed step-by-step guide, developers should refer to the official MetaMask Snaps documentation for instructions

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Are Snaps Safe?

The safety of MetaMask Snaps largely depends on the code quality and intentions of the developers who created them. MetaMask itself takes security seriously and offers a platform designed with security measures, but Snaps are third-party extensions and could potentially introduce vulnerabilities or malicious behavior. Therefore, it's important to only install Snaps from reputable sources and to be cautious when granting them permissions.

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Bottom Line

In conclusion, MetaMask Snaps are powerful plugins that amplify the capabilities of your MetaMask wallet, allowing for interactions across multiple blockchains and expanding the range of decentralized applications accessible. These extensions, written in JavaScript, operate in a protected environment to prioritize user safety. While MetaMask is dedicated to security, it's essential for users to exercise caution by installing Snaps only from trustworthy sources and being vigilant about permissions, ensuring a secure and versatile crypto experience.