Three cryptocurrency users face different operational demands. One manages Lightning Network payments and small Bitcoin transactions through a desktop browser, another holds Solana tokens and interacts with decentralized exchanges across multiple networks, and a third moves between DeFi protocols while minimizing exposure of transaction history to external observers. Each could reasonably choose Alby, Coin98, or Fastset—but the choice matters because these wallets distribute data visibility, permission requests, and recovery risks in fundamentally different ways.
Privacy in a browser wallet is not a single property. It involves protecting the recovery phrase from keyboard loggers and clipboard malware, controlling which blockchain data the wallet’s infrastructure observes, limiting third-party access to transaction history, and preventing the browser extension itself from leaking connection patterns to advertisers or analytics services. Understanding where each platform protects and where it exposes the user is the foundation for responsible deployment. The wrong choice can create false confidence, while the right one depends on the specific user’s network, threat model, and operating practices.
A browser wallet does not manage keys on a remote server the way a custodial exchange does. Instead, it runs cryptographic operations inside the browser extension or window itself, keeping the private key material on the device. That is a major structural advantage for custody, but it does not automatically make the wallet “private.” The extension can still communicate with backend servers, collect analytics, request blockchain data from third parties, and expose the user’s behavior through HTTP headers, DNS queries, and connection timing.
Alby, Coin98, and Fastset differ significantly in how they handle that communication layer. Alby operates primarily as a Lightning Network interface with some Bitcoin on-chain capability. Its architecture connects to Lightning nodes and relies on third-party providers for blockchain state queries. Coin98 is a multi-chain wallet supporting Ethereum, Solana, Polygon, Arbitrum, and dozens of other networks. It maintains its own node infrastructure and uses a combination of custom and public APIs. Fastset is designed as a Starknet-native wallet with encrypted key storage and a focus on permissionless, non-custodial interaction with Starknet contracts.
The distinction matters because different architectures create different leakage surfaces. A Lightning-focused wallet learns which nodes the user connects to and at what frequency. A multi-chain wallet learns which networks the user visits and which contract interactions they perform. A Starknet-native wallet can reduce chain-specific tracking by keeping interactions within a single privacy-enhanced environment. None of these eliminate surveillance entirely, but each concentrates the vulnerability in different places, which changes the practical risk depending on the user’s threat model.
The node connection question is one specific example. If Alby connects to a Lightning node operated by the wallet provider, the provider learns which invoices the user requests payment for. If the user points Alby to a personal Lightning node, that risk moves to their own infrastructure and network configuration. Similarly, Coin98’s approach to blockchain queries determines whether transaction lookups go through Coin98’s servers, public RPC endpoints, or the user’s own node. Fastset’s Starknet focus means less exposure to multi-chain data collection but less flexibility for users who need to operate across many networks.
All three wallets share a critical vulnerability: the browser extension can be counterfeited. A phishing site can serve a fake Alby, Coin98, or Fastset extension that appears identical but stores recovery phrases on attacker servers. This is not a theoretical risk. Phishing wallets account for a significant portion of cryptocurrency theft from extension-based users. The mitigation requires verifying the official publisher, confirming the correct installation source, and testing the wallet’s behavior before moving substantial funds.
Alby publishes through the Chrome Web Store and Firefox Add-ons under the publisher name “Alby.” The official repository is at alby.com, not a lookalike domain. Coin98 operates under publisher “Coin98 Inc” in official stores. Fastset is available through official Starknet channels. Before installation, a user should visit the wallet’s official website, locate the download link, and open it directly. Copying the download link and pasting it elsewhere can introduce a phishing vector. Bookmarking the official site and using the bookmark every time is a stronger habit.
After installation, the wallet should be tested with a small transaction or token balance before committing to it as the primary storage location. This test does not require spending money; it means creating a new wallet, receiving a small amount, sending it to a test address, and confirming the transaction completed correctly. That step also trains the user to observe the wallet’s UI, permission requests, and behavior. If the interface changes unexpectedly, or if the extension requests permissions it did not request before, the wallet may have been compromised or replaced.
Recovery phrase handling is the most consequential security decision. A user should never photograph a recovery phrase, store it in cloud notes, send it to anyone claiming to provide support, or type it into a form on any website. Not even the wallet’s official website should ask for the recovery phrase during setup. The wallet generates the phrase once, and the user writes it on paper or stores it offline. If the recovery phrase is lost, the funds are lost; if it is stolen, the funds are stolen. This irreversibility requires treating the recovery phrase as though it were the actual money.
Alby’s privacy posture is built around Lightning Network transactions, which are inherently more private than on-chain Bitcoin transfers. Lightning payments do not create a public record linked to a user’s address or the receiving address. The transaction occurs between two nodes on the network, and the payment path may be routed through intermediaries. However, Alby still observes which invoices are generated, how often payments occur, and potentially which services the user interacts with through Lightning. If the user’s Alby node is hosted by the provider rather than run locally, the provider has visibility into these patterns.
Coin98 spans multiple blockchains, which means the wallet can see the user’s activity across Ethereum, Solana, Polygon, and other networks. Multi-chain wallets offer greater flexibility and liquidity, but they create a single point of observation. If Coin98 logs which addresses interact with which contracts on which networks, it can build a comprehensive activity profile of the user. The wallet does not control the underlying blockchains, which remain transparent by design. Coin98 controls the interface layer, node selection, and potentially which queries it logs or shares with analytics partners. Users evaluating Coin98 should examine its privacy policy, node infrastructure details, and whether it uses analytics services that can associate transactions with identifiable data.
Fastset’s Starknet focus changes the structure. Starknet is itself designed with privacy improvements, including transaction privacy through the protocol itself. Fastset does not need to prevent Starknet from being transparent because Starknet’s architecture handles that. However, this also means Fastset is only useful for Starknet-specific operations. A user who needs to bridge assets from Ethereum to Starknet, or who wants to use DeFi across multiple networks, cannot accomplish that entirely within Fastset. The privacy benefit is concentrated but narrow.
The practical choice depends on the user’s primary activity. A user who sends small Lightning Network payments for services should prioritize Alby’s lightning-specific features and verify whether they run their own node. A user who actively trades across networks and interacts with multiple DeFi protocols needs Coin98’s multi-chain support, but should expect less privacy and configure it accordingly, such as pointing to custom RPC endpoints. A user focused exclusively on Starknet applications can benefit from Fastset’s streamlined design and Starknet’s privacy mechanisms.
Browser wallets request permissions to read and modify web page content, access the user’s browsing history indirectly, and communicate with external servers. These permissions are necessary for the wallet to function—the extension must inject code into decentralized applications so that the page can request wallet interactions. However, broad permissions also create an opportunity for the wallet to observe more than it strictly needs to.
Alby requests permission to read content on all websites where the user might access Lightning services. This includes Strikk, BTCPAY, and other payment processors. The permission is necessary, but it means Alby’s extension can theoretically observe which websites the user visits. In practice, legitimate wallets do not log this, but a user cannot verify this without examining the source code or using browser developer tools to monitor network traffic.
Coin98 requests permissions across all websites because the user may interact with DeFi protocols on any network. The extension must be ready to service any decentralized application. This broader permission scope means that Coin98’s extension has visibility into a wider range of user activity, which increases the importance of trusting Coin98’s privacy practices and verifying that the extension itself is not leaking data through analytics services.
Fastset requests more limited permissions because it is optimized for Starknet. Fewer permission requests can mean fewer opportunities for data leakage, but it also reflects the wallet’s narrower scope. A user who needs the extension on many websites should expect to authorize it on each relevant domain, creating more decision points and reducing the risk of overly broad permissions.
To verify permission scope, a user can right-click the extension icon, select “Manage Extension,” and review the site access settings. Some browsers allow extensions to run only on specific sites rather than all sites. Setting the wallet to “Run on click” or restricting it to specific domains reduces the extension’s persistent visibility and is a stronger privacy practice than allowing it full access to all pages.
When a user interacts with a smart contract through a browser wallet, the wallet must communicate with a blockchain node to read contract state, simulate the transaction, and broadcast the signed transaction. That communication happens outside the wallet’s direct control. The node can see the user’s address, the contract being called, and the function parameters, even if the user’s identity is not directly revealed.
Alby avoids much of this problem by limiting integration to Lightning Network and simple Bitcoin payments. Lightning transactions do not involve smart contract interaction, and Bitcoin payments are relatively simple from a data perspective. The wallet’s main privacy vulnerability is the Lightning node connection and the observability of payment patterns, not complex contract surveillance.
Coin98 supports thousands of smart contracts across many networks, which multiplies the integration complexity. Every contract interaction requires communication with a blockchain node, and depending on which node Coin98 uses, different parties can observe the interaction. Coin98 users who prioritize privacy should consider configuring a custom RPC endpoint that they control or using a privacy-focused RPC service. However, this configuration is rarely the default, which means most users accept the privacy trade-off without explicitly choosing it.
Fastset’s Starknet integration is simpler by design, but it does not eliminate the problem. Starknet nodes can still see contract interactions, and the wallet must communicate with a node to broadcast transactions. However, Starknet’s architecture and smaller user base may provide some privacy benefit compared to broadcasting transactions on Ethereum, where transaction analysis is more mature.
Users can review browser wallet guides official resources for specific guidance on configuring custom RPC endpoints and testing which node a wallet is connecting to. Browser developer tools can also show the wallet’s network requests. Opening the developer console (F12 on most browsers), switching to the Network tab, and performing a transaction reveals which servers the wallet contacts and what data it transmits.
Browser wallets are non-custodial, which means the user holds the recovery phrase and is fully responsible for its security. However, non-custodial also means there is no customer service that can reverse a mistake. If a user sends funds to the wrong address, approves a malicious contract to spend their tokens, or loses their recovery phrase, the loss is permanent.
Alby’s main recovery risk involves losing the recovery phrase or the browser profile containing the wallet extension’s data. If the user does not back up the recovery phrase on paper or another offline storage, and the browser is uninstalled or the computer fails, access to the wallet is lost. Alby does not have a “forgot password” feature because there is no central server holding credentials. The recovery phrase is the only recovery mechanism.
Coin98 faces the same recovery exposure, compounded by the fact that it manages addresses on multiple networks. A user who loses the recovery phrase loses access to all balances on all supported networks simultaneously. Coin98 does not have an account recovery service because it is not an account service. The wallet is a cryptographic tool, not a service with backup capabilities.
Fastset’s recovery model is similar. The recovery phrase is the sole recovery mechanism. Fastset does provide encrypted backup functionality within the extension, but this is a convenience feature and should not be confused with recovery. Encrypted backups are only useful if the user can access the same Fastset installation or has recorded the backup access credentials separately.
The responsible recovery practice is to test the recovery phrase before relying on it. A user should create the wallet, write down the recovery phrase, then delete the wallet from the browser. Next, reinstall the wallet and import the recovery phrase, confirming that the addresses and balances are identical. This test confirms that the recovery phrase is usable and that the user can execute a recovery under pressure. Testing should happen before moving substantial funds, not after losing access.
Alby is the strongest choice for a user whose primary activity is Lightning Network payments, personal Bitcoin management, and avoiding frequent multi-chain interaction. The wallet’s limited scope reduces data exposure surfaces, and Lightning’s protocol design provides inherent privacy advantages over on-chain transactions. A user running a personal Lightning node can point Alby to that node, eliminating the wallet provider’s visibility into payment patterns. The trade-off is limited functionality for users who need to interact with decentralized applications on multiple blockchains.
Coin98 is appropriate for a user who actively engages with DeFi across multiple networks, trades frequently, or uses bridging services. The multi-chain support is comprehensive, and the wallet is actively developed. The privacy trade-off is substantial because Coin98 observes activity across all networks. Users choosing Coin98 should plan to configure a custom RPC endpoint or use privacy-focused services, understand that their activity is more observable, and adjust their threat model accordingly. Coin98 is a powerful wallet for active traders and developers; it is not the best choice for users prioritizing privacy above all else.
Fastset is the strongest choice for a user who exclusively or primarily interacts with Starknet applications and values the privacy benefits of Starknet’s architecture. The wallet’s streamlined design and Starknet-specific optimization mean less bloat and fewer unnecessary permissions. However, a user who needs to bridge from other networks, trade on multi-chain DEXs, or interact with Ethereum-based services should use a different primary wallet.
In practice, many users employ more than one wallet. A user might use Alby for Lightning payments, Coin98 for active multi-chain trading, and Fastset for Starknet-specific activities. This reduces the privacy concentration risk of using a single multi-chain wallet for all activities. Each wallet is a distinct browser extension, each has its own recovery phrase, and each is separate from the others. This approach is more complex to manage, but it aligns privacy infrastructure with operational separation.
The privacy and security of any browser wallet depends first on the browser and operating system underneath. A compromised browser, a malicious operating system, or system-level malware can intercept the wallet’s operations, capture the recovery phrase, or steal funds before the transaction reaches the blockchain. No wallet extension can provide protection against these foundational threats.
A user should keep their operating system updated with the latest security patches, use antivirus or anti-malware tools, and avoid running untrusted software on the device where the wallet is installed. Using a dedicated browser profile for cryptocurrency wallets, and using a different browser for general web browsing, can reduce the risk of malware from advertisements or phishing pages affecting the wallet. Some users run the wallet on a separate physical device or in a virtual machine, further isolating the wallet from general computing activity.
Password managers should not be used to store cryptocurrency recovery phrases. A password manager is a cloud-connected service designed to be convenient, not secure for high-value secrets. The recovery phrase should be written on paper, stored in a safe, and protected the same way one would protect a physical document containing cash.
Browser security settings also matter. Disabling cookies for wallet-related sites, using privacy-focused browser extensions that block tracking, and avoiding browser extensions that modify page content can reduce the attack surface. However, the wallet extension itself must be allowed to modify page content, so the user must trust the wallet and verify it regularly.
Before selecting between Alby, Coin98, and Fastset, a user should answer three questions. First, what are the primary assets and networks that the wallet must support? If the answer is Bitcoin and Lightning, Alby is sufficient and strongly preferable for privacy. If the answer is multiple networks and frequent DeFi interaction, Coin98 is necessary despite its privacy trade-offs. If the answer is Starknet and related applications, Fastset is the most appropriate.
Second, what is the realistic threat model? If the user is concerned about being tracked by wallet analytics, they should prioritize Alby or configure Coin98 with custom RPC endpoints. If the user is concerned about recovery phrase theft due to browser malware, they should prioritize strong device security, offline phrase storage, and possibly a hardware wallet for larger balances. If the user is concerned about the wallet provider itself having access to their funds, any non-custodial wallet solves that, but they must protect the recovery phrase as though it were the funds themselves.
Third, is the wallet’s current privacy configuration aligned with the user’s expectations? A user selecting Coin98 must understand that the wallet provider and its node infrastructure can observe all activity. A user selecting Alby must understand that they are trading flexibility for privacy and that multi-chain operations are not supported. A user selecting Fastset must understand that the wallet is narrowly focused and that using it does not solve privacy challenges on other networks.
The decision should be made once, with clear documentation, before moving funds. Changing wallets after the fact is possible but requires exporting private keys or using the recovery phrase to import into a different wallet, both of which carry their own risks if executed carelessly. The initial choice deserves careful attention because the wrong choice can create friction that leads to operational mistakes.
You can use multiple wallets simultaneously. Many users maintain Alby for Lightning Network payments, Coin98 for multi-chain DeFi, and Fastset for Starknet-specific applications. This approach reduces the privacy concentration risk of using a single wallet for all activities and aligns each wallet with its strongest use case. Each wallet is a separate browser extension with its own recovery phrase, so they do not interfere with each other.
First, stop using the wallet immediately. Move any remaining funds to a new wallet by importing the recovery phrase into a fresh installation on a clean device. If you do not have the recovery phrase backed up offline, and you believe the phrase has been compromised, the funds should be moved as soon as possible. Never enter the recovery phrase into a form, chat, or website. Use only the official wallet application to import the phrase, and verify that the imported addresses match your expectations before confirming the funds are in the new wallet.
Visit the official wallet website from a bookmark or by typing the URL directly (never through a search engine or link). Locate the download or installation link and follow it to the official browser store. Verify the publisher name, review the number of installations and ratings, and check the installation date to confirm it matches when you installed it. Browser extensions can be counterfeited, so this verification step should happen before creating any wallet or entering the recovery phrase.