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Ammer Cards

🔍 Last analysed 10th November 2022 . Bad Interface

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.

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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.

If you find something we should include, you can create an issue or edit this analysis yourself and create a merge request for your changes.

The Analysis 

Product Description

  • The NFC-enabled card has a companion app.
  • To activate your new card, you will need the Ammer Wallet app. In the app, you will be able to manage your crypto assets and create virtual cards. To use the app with the card, you will need an NFC-enabled smartphone with NFC turned on.

  • Although the wallet is claimed to be self-custodial, the terms and conditions have language such as:

l) you are not a Restricted Person and do not present the interests of people or entities which are Restricted Persons; m) you shall not use the Services in connection with any Prohibited Business; n) you will not use the App and the Services for the purpose of the Prohibited Business and any other illegal activity, including but not limited to money laundering and the financing of terrorism; o) you will indemnify the Company against the damage that the Company suffers by violating the above representations


Like most NFC-enabled card hardware wallets it does not have its own display or interface to verify or confirm transactions.