Can a Bitcoin Wallet Be Truly Secure If Your Device Is Not?

[Ribust]

I'm not sure if I should mention this here, but I posted it here because I couldn't find any other place to learn about these things.

A lot of Bitcoiners invest a significant amount of their time in researching various aspects like wallets, methods of seed phrases' backups, and hardware used. Nevertheless, there is one major thing that usually goes overlooked: does it even matter when a device itself is compromised?

A wallet may have excellent privacy features, open-source code, and strong encryption, but malware, keyloggers, remote access trojans, or fake software updates can still put funds at risk. In many cases, attackers do not target the wallet itself, they target the operating system and the user's behavior.

I think all of this raises a few important questions.
Which I have outlined below.

1. How much does device security contribute to overall wallet security?

2. Is a hardware wallet enough protection against a compromised computer?

3. What are the best practices for securing a Bitcoin wallet environment?

4. Do Linux users actually gain a meaningful security advantage?

5. What are the most overlooked security mistakes made by experienced Bitcoin holders?

I would like to hear opinions from both software wallet and hardware wallet users regarding the relationship between device security and Bitcoin self-custody.

[Zaguru12]

A lot of Bitcoiners invest a significant amount of their time in researching various aspects like wallets, methods of seed phrases' backups, and hardware used. Nevertheless, there is one major thing that usually goes overlooked: does it even matter when a device itself is compromised?

Yes the device matters a lot and it’s the reason why you will read that the best type of wallet is the cold wallet, this is the wallet which doesn’t goes online to the internet, example is airgap wallet or Even hardware wallet which doesn’t exposes your seed phrase or private key to any device it’s connected too.

Most of the wallet drains you hear about are usually through compromization of the device, for example clipboard malware which changes the address you copy and tried to paste. Some of the malware attacks needs the hacker to compromise your device first and it’s the reason why hot wallets are definitely not advisable for large and long term holders

[ABCbits]

4. Do Linux users actually gain a meaningful security advantage?

1) Hacker or malware creator mostly target Windows users. But the advantage these days is reduced, because AI for coding makes it's easier for them to also target Linux and Mac OS users.
2) Most Linux distro give you freedom to custom the OS, so more advance users could make it more secure.
3) Some linux distro install and enable mandatory access control (such as AppArmor) by default, which limit what application could do.

Obviously none of them are that meaningful or helpful if the user still download and install/run any file on internet.

[Ribust]

Most of the wallet drains you hear about are usually through compromization of the device, for example clipboard malware which changes the address you copy and tried to paste. Some of the malware attacks needs the hacker to compromise your device first and it’s the reason why hot wallets are definitely not advisable for large and long term holders

Surely, clipboard malware has become very common; however, there are other ways to hack Bitcoin wallets apart from this malware. For example, the stealing of funds from Bitcoin wallets can take place with the help of fake software applications, phishing sites, or even malicious browser extensions.

This is why simply keeping your seed phrase safe is not enough. Even if an attacker never learns your seed phrase, they may still be able to manipulate what you see on your screen or trick you into signing a malicious transaction.

4. Do Linux users actually gain a meaningful security advantage?

1) Hacker or malware creator mostly target Windows users. But the advantage these days is reduced, because AI for coding makes it's easier for them to also target Linux and Mac OS users.
2) Most Linux distro give you freedom to custom the OS, so more advance users could make it more secure.
3) Some linux distro install and enable mandatory access control (such as AppArmor) by default, which limit what application could do.

Obviously none of them are that meaningful or helpful if the user still download and install/run any file on internet.

@ABCbits Thank you for providing such information.

Many people spend a lot of time comparing wallets, hardware wallets, operating systems, and backup methods, but they often overlook the biggest security factor: user behavior.

Although in the past Windows was the prime victim of malware due to having higher market share, this should not be taken by Linux or Mac OS users as a guarantee of safety. With the rapid development of coding techniques assisted by AI technology, writing malware for several operating systems is easier and faster than ever.

Linux does provide some advantages. Many distributions include security features such as AppArmor, SELinux, sandboxing, and stricter permission controls. Advanced users can further harden their systems by disabling unnecessary services, using separate user accounts, and keeping software updated.

However, the operating system is only one layer of security. If a user downloads a fake wallet, installs a malicious browser extension, runs an unknown script, or enters a seed phrase into a phishing website, neither Linux, macOS, nor Windows can fully protect them.

If they were more aware of these issues.

• Verifying wallet software signatures before installation.

• Keeping the operating system and applications updated.

• Avoiding browser extensions that are not absolutely necessary.

• Using hardware wallets for significant amounts.

• Treating every file, link, and website as potentially hostile until verified.

Obviously none of them are that meaningful or helpful if the user still download and install/run any file on internet.

Most Bitcoin heists that have been carried out successfully today happen when people voluntarily give access to their accounts due to a form of deception rather than through any hacking of contemporary cryptography.

[Cookdata]

A wallet may have excellent privacy features, open-source code, and strong encryption, but malware, keyloggers, remote access trojans, or fake software updates can still put funds at risk. In many cases, attackers do not target the wallet itself, they target the operating system and the user's behavior.

When it comes to security, not all wallet gives you the same security. A hardware wallet gives you better security compare to software wallet because the private keys are isolated from the host computer but an end user can be compromised if they don't use it properly. You can use a software wallet on your device and nothing will happen but you can use a wrong hardware wallet with fake software and get drained.[Here], in this case the user import keys to a wrong software.

1. How much does device security contribute to overall wallet security?

It does,  a device that download garbages with crack softwares and authorized apps is likely to download malware unnoticed than a user that rarely use device to click links on the internet.

2. Is a hardware wallet enough protection against a compromised computer?

No, your keys can be safe but wrong use of the wallet with a compromised software will land your coins in a scammer wallet.

3. What are the best practices for securing a Bitcoin wallet environment?

Use a hardware wallet with an airgap environment.

4. Do Linux users actually gain a meaningful security advantage?

Linux is better in term of security but all depends on the end user. If you play around on your terminal with commands and packages you don't know, you can expose your device.

[_act_]

1) Hacker or malware creator mostly target Windows users. But the advantage these days is reduced, because AI for coding makes it's easier for them to also target Linux and Mac OS users.

This is the first time that I see an established member on this forum that is good in bitcoin technical knowledge posted this. Since I have been posting on this forum, I always quote people that are saying that Windows is prone to malware, while they are also supporting just Linux like it can not be attacked. The only thing I may not like about Windows is that its OS is close source, but if talking about about protection against hackers, any devices are good but left for the users to know how to protect themselves. For wallets I prefer to go for a cold wallet which no OS are capable of getting any data from it.

[satscraper]

1. How much does device security contribute to overall wallet security?

I think device security is the dominant factor because the attack surface for connected wallets has likely expanded enormously ^{probably by 80–90%}

2. Is a hardware wallet enough protection against a compromised computer?

Not at all. A compromised machine can still change the destination address, so you need to pay attention to what you sign on your hardware wallet.

3. What are the best practices for securing a Bitcoin wallet environment?

In my view this is the multisig setup with a few cold signers ^{number depends on quorum} and hot coordinator which builds transaction to sign and send it after signing by cold signers.

4. Do Linux users actually gain a meaningful security advantage?

Not meaningful unless user is a hard core linuxoid. Of-the-shelf Linux is currently full of holes.

5. What are the most overlooked security mistakes made by experienced Bitcoin holders?

Self-trust.

[ABCbits]

1) Hacker or malware creator mostly target Windows users. But the advantage these days is reduced, because AI for coding makes it's easier for them to also target Linux and Mac OS users.

This is the first time that I see an established member on this forum that is good in bitcoin technical knowledge posted this. Since I have been posting on this forum, I always quote people that are saying that Windows is prone to malware, while they are also supporting just Linux like it can not be attacked.

That's weird, malware on Linux isn't that rare and there's even Wikipedia page about it on https://en.wikipedia.org/wiki/Linux_malware. There are also threads like More than 10 phishing wallets detected on the Snap Store, be careful that shows there are ways to attack.

[Welsh]

Qubes OS would probably prevent a lot of issues. Generally compromised qubes are isolated, and therefore you would be able to have a risky qube which is more likely to be infected, maybe because you do a lot of downloading of untrusted files, but still have a qube which is completely offline and isolated from your risky one, which you could have your Bitcoin wallet in.

However, Qubes OS definitely isn't for everyone and can be tedious to use at times. Plus, a lot of people aren't willing to give up that much QoL.

That's weird, malware on Linux isn't that rare and there's even Wikipedia page about it on https://en.wikipedia.org/wiki/Linux_malware. There are also threads like More than 10 phishing wallets detected on the Snap Store, be careful that shows there are ways to attack.

When we are talking about general malware, i.e malware that's designed to affect as many users as possible, Windows is by far the most common route, simply because of the permissions, the general skill level of windows users (not to say all are, I use Windows on specific machines for example.).

However, when we compare that to malware specifically targeting Bitcoin users. You'll probably find that the share of Linux attacks is a little more than the norm. Simply because a bigger percentage of Bitcoin users are likely using Linux, and therefore attacks are incentivized to attack Linux.

Again, Windows still likely has the highest shares of attacks just because of the way its designed. Its much easier to infect a Windows user. However, Linux used wrong, which a lot of users will due to not learning about it can still absolutely be vulnerable.