The design of the device does not allow to verify what is being signed!
As part of our Methodology, we ask:
Can the user verify and approve transactions on the device?If the answer is "no", we mark it as "Bad Interface".
These are devices that might generate secure private key material, outside the reach of the provider but that do not have the means to let the user verify transactions on the device itself. This verdict includes screen-less smart cards or USB-dongles.
The wallet lacks either an output device such as a screen, an input device such as touch or physical buttons or both. In consequence, crucial elements of approving transactions is being delegated to other hardware such as a general purpose PC or phone which defeats the purpose of a hardware wallet.
Another consquence of a missing screen is that the user is faced with the dilemma of either not making a backup or having to pass the backup through an insecure device for display or storage.
The software of the device might be perfect but this device cannot be recommended due to this fundamental flaw.The product cannot be independently verified. If the provider puts your funds at risk on purpose or by accident, you will probably not know about the issue before people start losing money. If the provider is more criminally inclined he might have collected all the backups of all the wallets, ready to be emptied at the press of a button. The product might have a formidable track record but out of distress or change in management turns out to be evil from some point on, with nobody outside ever knowing before it is too late.
But we also ask:
Is the product still supported by the still existing provider?If the answer is "no", we mark it as "Not functioning anymore".
Discontinued products or worse, products of providers that are not active anymore, are problematic, especially if they were not formerly reproducible and well audited to be self-custodial following open standards. If the provider hasn’t answered inquiries for a year but their server is still running or similar circumstances might get this verdict, too.
Help spread awareness for build reproducibility
Please help us spread the word discussing build reproducibility with ColdLar Touch via their Twitter!
Do your own research!
Try out searching for "lost bitcoins", "stole my money" or "scammers" together with the wallet's name, even if you think the wallet is generally trustworthy. For all the bigger wallets you will find accusations. Make sure you understand why they were made and if you are comfortable with the provider's reaction.
The Analysis ¶
Updated Review 2022-11-26
The primary domain coldlar.com is no longer online. However, a possible clone or duplicate site, hengshengjia.com is still online. We asked on twitter whether this is an official site and we await their response.
From the clone website, it appears the device is supposed to be connected via NFC to an already non-existing Google Play app with id=com.coldlar.hotwallet. The APK is available via third party websites. The update for the app is dated May 29, 2020.
Pending the reply on twitter, there are many indications that this product is already defunct. The previous verdict indicating there is no interface stands.
Previous Review 2022-03-23
Without a screen and without a button, this device cannot provide basic security of hardware wallets.
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