TANGEM WALLET: An Innovative Seedles Cold Wallet Setup

[satscraper]

I've had my Tangem cards for over a year now, and I have to say that I'm quite happy with how they perform especially for on-the-go use.

What I would add to OP's nice review is that Tangem's SE ^{namely, S3D350A} is manufactured by Samsung.

The chip is flashed once during production and contains many monitoring sensors, including those responsible for detecting third-party interference.

What’s also interesting about this chip is that it includes as many as five TRNGs:

[babo]

very interesting, I follow these technical discussions with pleasure
I'm asking myself a little question, let's say a provocation

It is estimated that current addresses can easily become broken in 5 years at this rate of quantum computing growth
so I wonder if it doesn't make sense to wait for a wallet like that, since in 4-5 years we'll have to change

[fillippone]

very interesting, I follow these technical discussions with pleasure
I'm asking myself a little question, let's say a provocation

It is estimated that current addresses can easily become broken in 5 years at this rate of quantum computing growth
so I wonder if it doesn't make sense to wait for a wallet like that, since in 4-5 years we'll have to change

In the next 4/5 years you can use Tangem wallet if you want more security compared to an hot wallet. When the QC will be so powerful to break a cryptographic key, then we will have to upgrade. When QR Bitcoin will be released, then we will need again to rebuild all the wallets.
No rush.

[satscraper]

very interesting, I follow these technical discussions with pleasure
I'm asking myself a little question, let's say a provocation

It is estimated that current addresses can easily become broken in 5 years at this rate of quantum computing growth
so I wonder if it doesn't make sense to wait for a wallet like that, since in 4-5 years we'll have to change

I'm still trying to fully grasp the implications of quantum computing. One thing I'm uncertain about is whether quantum computers will be able to break addresses without violating the fundamental Landauer's principle, which could theoretically limit any computational device ^{even quantum one}. On top of that, some research suggests that quantum effects could actually result in higher energy dissipation compared to the theoretical Landauer limit, with estimates indicating an increase by a factor of 30. If this holds true, it raises the question of whether it's technically feasible to realize such computational schemes in the near future.

[babo]

In the next 4/5 years you can use Tangem wallet if you want more security compared to an hot wallet. When the QC will be so powerful to break a cryptographic key, then we will have to upgrade. When QR Bitcoin will be released, then we will need again to rebuild all the wallets.
No rush.

I think we will have to move the funds to more resistant addresses, nothing magical and nothing astronomical, no rocket science
I wonder if this wallet will support them after, otherwise I'll keep mine until it changes permanently that's all

I'm still trying to fully grasp the implications of quantum computing. One thing I'm uncertain about is whether quantum computers will be able to break addresses without violating the fundamental Landauer's principle, which could theoretically limit any computational device ^{even quantum one}. On top of that, some research suggests that quantum effects could actually result in higher energy dissipation compared to the theoretical Landauer limit, with estimates indicating an increase by a factor of 30. If this holds true, it raises the question of whether it's technically feasible to realize such computational schemes in the near future.

I honestly think we will reach unimaginable computing powers with quantum computing, it implies a real paradigm shift from 1/0 to an even more powerful fuzzy logic
Of course, nobody has a crystal ball and in my opinion 4/5 years is very optimistic, a click-bait title
but we don't know if AI can evolve to the point of making a significant contribution

[dkbit98]

It would be great if the card was made of a flame-retardant material.

I have seen metal cards before, so it's not impossible to make them, but I would never use Tangem cards even if they are indestructible  

hardware wallet, exposed emails, and logged private keys should never be in the same sentence. holy smokes, this is even worse than ledger, and i thought that was as bad as a hardware wallet could get.
how can anyone still trust this shitshow hardware wallet with their coins?

It's much worse and I think this is not the only time they leaked customer information.
I don't understand how people can ignore this and still use tangem, but I guess they like to live risky and on the edge.

Tangem stated, "no private keys were compromised, no user funds were lost, and no accounts were accessed.”.

This is not true.
People lost coins and they posted publicly about that, tangem is only covering things up.
Even if they fixed the ''bug'' it showed how they are amateurs.

This is not a risk.
Tangem as a firm is never involved in the store of your coins, no Tangem server is needed to move your assets, and in case you need to recover your fund, you will always be able to do so following this guide.

It is a risk, and I have to say that this comic style ''guide'' is one of the worse thing I saw in my life.
If you have to joke about ''aliens'' and 2069 and Gamma Cephei, than they have serious mental issues.
Problem with tangem is much bigger than I expected, back and recovery is a serious thing.

[fillippone]

I have seen metal cards before, so it's not impossible to make them, but I would never use Tangem cards even if they are indestructible  

[/quote]

It's much worse and I think this is not the only time they leaked customer information.
I don't understand how people can ignore this and still use tangem, but I guess they like to live risky and on the edge.

This is not true.
People lost coins and they posted publicly about that, tangem is only covering things up.
Even if they fixed the ''bug'' it showed how they are amateurs.

It is a risk, and I have to say that this comic style ''guide'' is one of the worse thing I saw in my life.
If you have to joke about ''aliens'' and 2069 and Gamma Cephei, than they have serious mental issues.
Problem with tangem is much bigger than I expected, back and recovery is a serious thing.

Wow, you really hate this product.
You claim that people lost money in the “bug” accident, and Tangem covered this up. If you have some evidence, please point me in the correct direction, so I can check and eventually add this to the OP, as it would be a pretty much serious thing to report.

Regarding other aspect, I think is a misunderstanding here.

Would I use Tangem to store my big stash? No. Seedless storage is not an option in this case.
Would I use Tangem to store a low percentage of my stash on my mobile having an extra layer of protection keeping my seed offline all the time, without worrying of a backup? Yes. Seedless storage is an option for the money I can afford to lose if something random happens.

Would I go with all my bank account on my wallet? No never.
Would I go with a few hundreds buck in my wallet? Yes, if I want to have the convenience of a quick, private , payment without worrying to much if my wallet gets stolen or lost.

It’s a fine balance, convenience vs security. And there are many use cases where I think the first outweighs the seconds. In these cases only, I think Tangem is a good option.

[satscraper]

People lost coins and they posted publicly about that, tangem is only covering things up.
Even if they fixed the ''bug'' it showed how they are amateurs.

This is not accurate. No one lost their coins. What actually happened was that some users noticed the flaw in their mobile app's code. This could potentially affect the small number of users who set up their Tangem using SEED ^{i.e. preferred to have not seedless wallet} , and contacted support within one week of setup without carefully reading the automatically generated, relevant message content in the app.

Even if they fixed the ''bug'' it showed how they are amateurs.

 

By that logic all software developers could be considered amateurs. Even Satoshi could be, as bitcoin had bug, even Linus Torvalds could be, since Linux has had plenty of bugs some of which went unnoticed for decades, even Foundation devices could be, as their firmware had bug. ^{I'm not going to proceed with other narrations}. No software is completely bug free. Show me the complex software that has zero bugs.

[dkbit98]

Wow, you really hate this product.

No I don't hate tangem, I am simply using my head and doing a research.
Tangem is insecure closed source piece of ship with many secure flaws, and it is making people more lazy and more stupid.
Sorry, I forgot to mention another security flaw in tangem that is identified by donjon team:
https://www.ledger.com/tangem-genuine-check-bypass-on-android-application

You claim that people lost money in the “bug” accident, and Tangem covered this up.

Dude, they publicly admitted that KEYS GOT LEAKED!
This is worse than losing actual coins, but you are choosing to trust tangem instead.

This is not accurate. No one lost their coins.

Not your keys = not your coins = not your tangem.
Simple.

PS
Last time I checked tangem even had NO Coin Control... and it's 2025  

[fillippone]

PS
Last time I checked tangem even had NO Coin Control... and it's 2025  

It has no coin control.
But which mobile wallet has?
I might be wrong here, but every mobile wallet I used didn’t offer this feature.
I do agree their wallet app is pretty basic: I tried to set a decimal value of fees in Sats/vbyte and it wasn’t possible.

When comparing Tangem, I think a fair comparison is not electrum desktop or sparrow, but an average mobile hot wallet.

[dkbit98]

It has no coin control.
But which mobile wallet has?

Satochip has coin control, and it's open source hardware wallet in card format.
Plenty of mobile wallets support coin control, and I will name few of them here, Nunchuk, Blue wallet, Green, Envoy, Ashigaru, Aqua wallet, etc.

When comparing Tangem, I think a fair comparison is not electrum desktop or sparrow, but an average mobile hot wallet.

Than I will use any FREE open source hot wallet, instead of paying for tangem.

[babo]

PS
Last time I checked tangem even had NO Coin Control... and it's 2025  

It has no coin control.
But which mobile wallet has?
I might be wrong here, but every mobile wallet I used didn’t offer this feature.
I do agree their wallet app is pretty basic: I tried to set a decimal value of fees in Sats/vbyte and it wasn’t possible.

When comparing Tangem, I think a fair comparison is not electrum desktop or sparrow, but an average mobile hot wallet.

ah it doesn't have coin control?
mmmm in fact dkbit98 is right, both ledger and safepal have control
not to mention the old and always criticized electrum
the fact that it doesn't have this thing leaves me a little perplexed honestly
Do they have it in their roadmap or do they just not want to implement it?

[satscraper]

Do they have it in their roadmap or do they just not want to implement it?

This is still a sealed book. They haven’t even managed to implement support for multiple Bitcoin addresses, despite promising it over a year ago. It seems their focus is mostly on adding more tokens to the Tangem wallet and developing TangemPay, which is reportedly in the testing phase. I’ve seen a few YouTube reviewers who received Tangem Visa card for testing and have already shared their first impressions of TangemPay.

[Pmalek]

Tangem seemed like an interesting concept but the key leakage is the worst thing that a hardware wallet can do. If we agree that a hardware wallet is a device that is supposed to keep your keys safely on said device, Tangem doesn't meet this requirement. It might have been for a short time and the problem might have affected only a small part of their users, but it's a huge no-go.

Plenty of mobile wallets support coin control, and I will name few of them here, Nunchuk, Blue wallet, Green, Envoy, Ashigaru, Aqua wallet, etc.

Even Electrum mobile has a weird concept that can be considered as coin control. They allow you to freeze coins and addresses, leaving the one/ones you want to pay from unfrozen. Like I said, a weird way to implement coin control.

[babo]

Do they have it in their roadmap or do they just not want to implement it?

This is still a sealed book. They haven’t even managed to implement support for multiple Bitcoin addresses, despite promising it over a year ago. It seems their focus is mostly on adding more tokens to the Tangem wallet and developing TangemPay, which is reportedly in the testing phase. I’ve seen a few YouTube reviewers who received Tangem Visa card for testing and have already shared their first impressions of TangemPay.

no thanks then I'll pass
this kind of stuff really disgusts me honestly, I've compromised too many times I would like to avoid those who make their main business selling tokens
I buy your hw because I don't want any hassle and you focus on tokens
it means you don't care about the wallet

step

[Becassine]

Meanwhile, Tangem has been shortlisted for the WAIBsummit in its "Most Trusted Wallet Award" category. https://waibsummit.newcampus.com/nominees

I don't know how they make the selection, since the Bitbox is missing. That's weird, isn't it?

And the wallets are quite different from each other too. I don't know, I've never heard of this summit.

[HodlRoad]

Another reason I don't like Tangem is that you can only use it with their app, so there is no way to use any third party wallets.
In case Tangem company goes bankrupt there is good chance coins will be lost.

I get your concerns, but one important thing to note: even if Tangem shuts down, the wallet won't become useless. While the app itself isn't fully open source, Tangem has published their SDK on GitHub, so it's possible to build a custom app manually. You can do it yourself or ask a developer to help. The key point is that the private key is stored securely on the card itself, not in the app. So as long as you have the card, you can still access your funds even if the official app disappears.

[Pmalek]

Meanwhile, Tangem has been shortlisted for the WAIBsummit in its "Most Trusted Wallet Award" category. https://waibsummit.newcampus.com/nominees

I don't know how they make the selection, since the Bitbox is missing. That's weird, isn't it?

Many quality brands are missing from that list. Nothing about that deserves to be called a trusted wallet list. I have never heard of Youhodler but it looks like a crypto tech company. Ledger is on the list and this company hasn't radiated trust the last couple of years. The other two "wallets" are for the OKX and Bitget exchanges. And last but not least there is Tangem.

Maybe those who pay the most get a nomination and stand a chance to win the award.

[libert19]

...The issue did not affect seedless setups, which remain Tangem’s recommended option...

I never felt safe with their seedless option, what if cards stop working? Tangem does look confident that their cards will keep on working but what if one day they don't? You'll be dusted.

[satscraper]

Another reason I don't like Tangem is that you can only use it with their app, so there is no way to use any third party wallets.
In case Tangem company goes bankrupt there is good chance coins will be lost.

I get your concerns, but one important thing to note: even if Tangem shuts down, the wallet won't become useless. While the app itself isn't fully open source, Tangem has published their SDK on GitHub, so it's possible to build a custom app manually. You can do it yourself or ask a developer to help. The key point is that the private key is stored securely on the card itself, not in the app. So as long as you have the card, you can still access your funds even if the official app disappears.

I’d like tp elaborate a bit your post and, at the same time, this topic to clarify for others how Tangem app operates under the hood.

First, the Tangem app is open source software. This means that even if the Tangem company were to shut down, the community could audit, fork, and maintain the app independently.

Second, the app’s ability to function does not depend on Tangem’s servers. Instead, the app communicates with various blockchains using public RPC/API endpoints ^{with built-in redundancy of 3–5 public servers per supported blockchain}. If one server goes down, the app automatically switches to another, ensuring continued access to supported assets and relevant blockchain data. One of the services Tangem uses for this decentralized connectivity is GetBlock:

Therefore, if Tangem company were to shut down, the cards would continue to function as intended.