A developer working from a coffee shop needs to check her Solana wallet balance, approve a transaction, or manage a small SPL token position. Opening the Solflare wallet extension on the laptop connected to the café’s open WiFi feels straightforward—the wallet is non-custodial, the private keys are encrypted locally, and the interface shows a lock icon. Yet the question that should precede this action is not whether Solflare itself is secure, but rather what attack surface exists when a browser extension runs on a compromised or monitored network. Public WiFi creates a specific set of risks that encryption and good design can mitigate but not eliminate entirely.
The perception that a crypto wallet extension is simply “unsafe” on public networks oversimplifies the threat model. A non-custodial architecture means the wallet provider never sees the user’s private keys or seed phrase, even during setup or transactions. Encryption, biometric authentication, and transaction preview screens add real security layers. However, the network path between the device, the Solana blockchain, and any DeFi platform introduces new vulnerabilities that have nothing to do with the wallet’s internal code quality. Understanding which risks are real, which are theoretical, and which are manageable through practical steps is the foundation of sensible operational security.
Why a non-custodial design limits—but does not eliminate—network risk
The Solflare wallet extension maintains full user control of private keys through local encryption and password protection. That architectural choice is significant: the wallet provider’s servers never hold the keys that authorize transactions, so a breach of Solflare’s infrastructure cannot directly steal funds. This is fundamentally different from a custodial exchange, where a network compromise could expose all user assets held in the company’s wallets. The Solflare wallet extension operates on the assumption that the user’s device is the only place where unencrypted key material exists.
Public WiFi does not change that fact, but it does change the threat model. An attacker on the same network cannot simply read encrypted keys stored on the device, assuming the device’s encryption is sound. What the attacker can do is intercept or manipulate communication between the device and external services: the Solana RPC endpoint that the wallet queries for balance and transaction status, the blockchain itself, or any DeFi protocol the user interacts with. If the user approves a transaction without verifying the recipient address and amount on a compromised connection, they may unknowingly send funds to an attacker-controlled address rather than the intended destination.
This is where the wallet’s transaction preview feature and risk alerts provide a meaningful defense. Before a transaction is broadcast, the Solflare wallet extension displays what is about to be signed: the recipient, the amount, the network fee, and the estimated execution cost. If network manipulation has occurred upstream—for example, if a man-in-the-middle (MITM) attack has altered the transaction data—the user should see the wrong address or an unexpected amount and refuse to sign. The critical weakness in this protection is user attention: if the preview is skimmed rather than carefully checked, or if the attacker’s address is visually similar to the intended one, the review fails.
Biometric authentication adds another layer of friction. Approving a transaction requires a fingerprint or face recognition in addition to the wallet’s password, which raises the barrier to casual unauthorized access on a shared or briefly unattended device. However, biometric authentication on a public network does not prevent MITM attacks, address manipulation, or session hijacking. It only protects against someone physically taking the device and attempting to unlock it. A user who is already authenticated to the Solflare wallet extension and browsing DeFi platforms on the same public WiFi network has already passed the biometric checkpoint and is working with an active session.
The actual mechanics of a man-in-the-middle attack on Solflare Extension
For a MITM attack to succeed against the Solflare wallet extension, the attacker must position themselves between the device and the legitimate blockchain or service endpoint. On public WiFi, this is technically straightforward: an attacker can set up a rogue access point with a legitimate-sounding name, or if they are on the same network as the target, they can use ARP spoofing or DNS hijacking to redirect traffic. The question is what they can actually achieve once they control the network path.
HTTPS and SSL/TLS encryption protect the content of most communications, which is why a mere network interception cannot read the private keys in transit—there are no keys being transmitted in plaintext. However, HTTPS protects only the content of the conversation, not the endpoints themselves. An attacker can still redirect traffic to a fraudulent but valid HTTPS-encrypted address. If the attacker controls the network and can intercept DNS queries, they can respond with a fake IP address pointing to a fake service that mimics the Solana blockchain or a DeFi protocol. If the user’s device does not carefully verify the SSL certificate presented by that fake service—which many browsers and wallet extensions do poorly for non-standard hosts—the connection can be accepted.
From the attacker’s perspective, the goal is not to steal the private key (which is still encrypted on the device) but to trick the user into approving a transaction that enriches the attacker. This could involve displaying a fake balance, showing a fraudulent transaction preview, or using social engineering in a carefully crafted error message to convince the user that a high-priority action is needed immediately. The Solflare wallet extension’s transaction preview and risk alerts are designed to catch obvious manipulations, but a sophisticated attacker can make the fake data consistent and visually plausible.
In practice, this attack is difficult to execute at scale because it requires the attacker to be on the specific network, to compromise the DNS or routing for the services the user visits, and to craft a believable fake transaction interface. However, on a public WiFi network, the first condition is automatically met. The attacker need only wait for a user to connect to the coffee shop’s WiFi and begin using their wallet.
Certificate pinning, domain verification, and what the Solflare wallet extension actually protects
One defense against MITM attacks is certificate pinning: the wallet extension can be configured to accept only HTTPS certificates signed by specific trusted authorities for specific domains. If the Solflare wallet extension implements certificate pinning for the Solana RPC endpoints and DeFi protocol connections it uses, a fake certificate presented by an attacker cannot be used to impersonate those services. Pinning is not a complete solution—it adds friction to legitimate certificate updates and does not protect against compromised Certificate Authorities—but it does raise the cost of a successful attack.
Domain verification and DNSSEC (DNS Security Extensions) can also help, though they are not universally deployed. If the Solflare wallet extension explicitly checks that the domain it is connecting to matches an expected name, and if DNSSEC is enabled on the network, DNS hijacking becomes much harder. However, most public WiFi networks do not enforce DNSSEC, and the burden falls on the client to validate it. The practical result is that an ordinary user connecting to a café’s open WiFi may have little automatic protection against a crafted DNS attack.
What the Solflare wallet extension does protect is the private key itself. Even if an attacker compromises the network and tricks the user into approving a malicious transaction, the key remains encrypted on the device. The attacker cannot use the key to perform arbitrary transactions later, because they never obtained it. This is a meaningful limitation on the attacker’s reach: they can steal one transaction if the user is careless, but they cannot drain the entire wallet remotely or access funds indefinitely.
Practical risks: Balance checking, token display, and address verification
Not every interaction with the Solflare wallet extension on public WiFi carries the same risk. Checking a balance, viewing an NFT gallery, or reviewing transaction history does not require signing anything or authorizing a change to the blockchain. However, these read operations still depend on network integrity. If an attacker intercepts the balance query, they could return fake data—showing a higher balance than actually exists, or concealing a recent withdrawal—to provide false confidence or to support a social engineering attack.
The real consequence becomes apparent when the user sees a fake balance and, based on that incorrect information, makes a financial decision elsewhere. They might believe they have enough SOL to cover a transaction fee when they do not, or they might assume a recent deposit arrived when it has not. The wallet extension cannot independently verify the blockchain state because it must query an RPC endpoint (Solana’s publicly available node service), and the RPC endpoint connection can be compromised on a hostile network.
SPL token display and NFT gallery viewing have the same property: they rely on fetching metadata and state from the Solana blockchain or external services like Metaplex. If the attacker controls the network path, they can serve fake token metadata, swap NFT images, or hide tokens entirely. None of this changes the actual blockchain state or allows the attacker to steal funds, but it can confuse the user and support social engineering. A user who believes they own a valuable NFT (because the attacker showed them a fake image of one) might be manipulated into sending real SOL in a fraudulent trade.
Address verification is where the transaction risk concentrates. Before sending SOL or any SPL token, the user must carefully check that the recipient address shown in the Solflare wallet extension matches the intended destination. On public WiFi, an attacker can attempt to substitute a different address in the transaction preview. If the user approves the transaction without checking character-by-character (which is laborious but necessary for high-value transfers), they may send funds to the wrong place. Unlike a balance display error, this is irreversible: once the transaction is confirmed on the blockchain, the funds are gone.
When to avoid the Solflare wallet extension on public networks and when it’s acceptable
For any transaction involving a meaningful amount of SOL or tokens, the safest approach is to avoid using the Solflare wallet extension on public WiFi entirely. Move to a wired connection, a private mobile hotspot, or home network before approving transfers. The risk of losing funds to a sophisticated MITM attack is low in absolute terms, but the consequences are permanent. If the transaction is small enough that the user can afford to lose it if something goes wrong, the public network risk may be acceptable; for larger amounts, it is not.
Reading balances, viewing NFTs, and monitoring portfolio performance on public WiFi are lower-risk activities. An attacker can confuse or mislead, but they cannot steal funds directly from these operations. If the user treats the displayed information as potentially unreliable—checking critical details against a separate trusted source, such as a direct blockchain explorer query from a home network, before making financial decisions—the risk shrinks further. This is not convenient, but it is realistic about what public networks can compromise.
Staking and DeFi interactions fall into an intermediate category. Initiating a stake, depositing to a lending protocol, or executing a swap requires broadcasting a signed transaction, which carries the same address verification and MITM risks as a direct transfer. The Solflare wallet extension supports these operations through seamless platform connectivity and transaction previews, which are valuable on trusted networks. On public WiFi, the same features still apply, but the attacker’s opportunity is multiplied because DeFi transactions often involve multiple steps and can be complex enough to hide malicious changes in transaction parameters.
The one situation where the Solflare wallet extension is especially risky on public WiFi is during the initial setup or recovery. If the user is entering a recovery seed phrase or creating a new wallet on a compromised network, keystroke logging or screen recording by an attacker could expose the seed. This is arguably the highest-value attack: the seed phrase grants complete access to the wallet. It should never be entered on a public network or any device whose network security cannot be verified. The same rule applies to creating a password or backup seed for the first time; these should always happen on a trusted connection.
Practical mitigation strategies for unavoidable public network use
If the user must interact with the Solflare wallet extension on public WiFi, a VPN (Virtual Private Network) can provide meaningful protection by encrypting all traffic between the device and the VPN server. This prevents an attacker on the local WiFi from seeing or modifying the communication with the Solana RPC endpoint or DeFi platforms. However, the VPN introduces a new trust assumption: the VPN provider becomes an intermediary with visibility into the user’s traffic. A logging VPN or one operated by an untrusted party is sometimes worse than the local network risk. A reputable VPN provider with a no-logging policy and strong encryption is a reasonable choice, though it is not a perfect solution.
Using Tor through the Tor Browser is another option that provides stronger anonymity and route encryption. Tor is slower and can introduce additional confirmation latency, but it disperses the trust across multiple nodes rather than concentrating it in a single VPN provider. The Solflare wallet extension is not specifically optimized for Tor, so the user would need to configure Tor at the system level and accept the performance trade-off.
For hardware wallet users, Ledger integration with the Solflare wallet extension offers another layer of protection. The private key remains on the hardware device and never touches the computer or the public WiFi network. The device must still connect through a compromised network to access the blockchain, so the address verification and transaction review protections become even more critical. However, the guarantee that the key material is isolated from the network environment provides psychological and practical reassurance. A Ledger device on public WiFi is genuinely safer than a software wallet with the same non-custodial architecture, because the attack surface for key extraction is dramatically reduced.
Regardless of which method is chosen, the fundamental defense remains user attention. Every transaction must be carefully reviewed: the recipient address should be checked character-by-character or by copying and pasting from a trusted source, the amount should match the intended transfer, and the network should match the blockchain where the funds actually exist. The Solflare wallet extension’s transaction preview helps, but it cannot replace the user’s skepticism and care. If something seems off or happens too quickly, the safest response is to close the wallet, disconnect from the network, and resume on a trusted connection.
Why Solflare security is strong but network security is separate
The distinction between Solflare security and network security is crucial for accurate risk assessment. The Solflare wallet extension uses encryption, password protection, biometric authentication, and transaction previews with risk alerts. These are robust security measures against threats directed at the wallet itself: unauthorized access to the device, malicious modifications to the extension, or credential compromise. The non-custodial architecture means the provider never holds the private keys, so even a complete compromise of Solflare’s infrastructure would not directly steal user funds.
Network security, by contrast, is something the user and their internet service provider are responsible for. The Solflare wallet extension cannot guarantee that the public WiFi network is not compromised, that DNS is not being hijacked, or that an attacker is not intercepting traffic. The best the wallet can do is implement certificate pinning, validate SSL certificates carefully, and display information in ways that allow the user to verify it independently. Beyond that, security depends on the user’s choice of network and the precautions they take.
This is why saying “this wallet is secure” is both true and misleading. The Solflare wallet extension is secure in its design and architecture. The Solana blockchain is secure in its consensus and finality. But a transaction approved on a compromised public WiFi network can still be manipulated by a network attacker, regardless of how well the wallet and blockchain are built. Security is a chain, and the public WiFi network is one of the links. If that link breaks, the rest of the chain cannot compensate.
Building a realistic threat model for your use case
The decision to use the Solflare wallet extension on public WiFi should flow from a specific threat model: Who might attack you? What are they trying to achieve? How much loss can you absorb? For most users, the relevant threats on public WiFi are not state-sponsored adversaries or sophisticated cybercriminals, but rather casual attackers looking for easy targets or network compromise by the venue itself. A coffee shop that accidentally runs a compromised router, or a malicious visitor who sets up a rogue access point, creates real but relatively low-skill attack scenarios.
Against these threats, the Solflare wallet extension’s security controls are quite effective. The password and biometric protection stop casual device takeovers. The transaction preview and risk alerts catch obvious address substitutions. The encryption of private keys means the attacker cannot extract them remotely. The non-custodial architecture ensures that even if your account is somehow compromised, your funds are not held by Solflare and cannot be seized through a server breach.
What the wallet cannot defend against is a determined network-level attack by someone with specific knowledge of your assets and intentions. If an attacker knows you are holding a valuable NFT or a large SOL balance, knows you are on a particular public network, and crafts a sophisticated MITM attack to redirect a transaction, the wallet’s defenses can be overcome by careful social engineering or unnoticed transaction manipulation. The probability of this specific scenario is low, but it is nonzero, especially if you are a known or public figure in the crypto community.
A practical risk framework starts with the amount at stake. For small transactions—buying a coffee’s worth of SOL, checking a balance, reviewing an NFT—public WiFi is acceptably safe if you use a VPN or Tor. For moderate transactions—moving a few hundred dollars, swapping tokens, or staking—use a private network or accept the risk consciously. For large transactions—moving a significant portion of your portfolio, executing a DeFi trade with substantial leverage, or recovering a wallet—use only trusted networks. This is not a technical requirement; it is a recognition that the attack surface grows with the value at stake, and the attacker’s incentive grows accordingly.
Frequently asked questions
Can an attacker on public WiFi steal my SOL if I use the Solflare wallet extension?
Not directly by reading your private key, because the Solflare wallet extension encrypts it locally on your device. However, an attacker can perform a man-in-the-middle attack to manipulate the transaction data you see, potentially trick you into approving a transfer to their address, or display false balance information to support social engineering. The private key remains secure, but your funds can still be lost if you approve a fraudulent transaction. This is why careful address verification and transaction preview review are critical.
Is it safe to check my balance using the Solflare wallet extension on a public network?
Technically yes, because reading your balance does not involve signing a transaction. However, the balance displayed could be falsified by a network attacker, so you should not make financial decisions based solely on what the wallet shows. If you need to verify your actual balance before making a transfer, use a separate device on a trusted network, or access a blockchain explorer from a different connection to cross-check the information.
What is the safest way to use the Solflare wallet extension on public WiFi?
Use a VPN or Tor to encrypt your traffic and prevent local network eavesdropping. Avoid approving transactions involving large amounts or sensitive operations. Always verify the recipient address character-by-character before signing. For hardware wallet integration with Ledger, you gain additional protection because the private key never reaches your computer. If possible, defer significant transactions until you are on a trusted network. Users can find more information and download the solflare wallet extension from the official source before using it on any network.
