Frequently Asked Questions

What is the Card Wallet?

The Card Wallet is a co-production from Coinfinity and the Austrian State Printing House and a simple way to store Bitcoin offline and secure in the form of a tamper-proof card. The Card Wallet is manufactured using Coinfinity's Secure Entropy Technology (see below) in the high-security room of the Austrian State Printing House in an isolated offline system. The private key is sealed tamper-proof before the card leaves the production machine and deleted immediately after the process so that not even the staff at the high-security room can ever see the key. High-quality security materials and tamper-proof features prevent the manipulation of the card.

Where can I buy the Card Wallet?

The Card Wallet is up for sale in our webshop. Furthermore you can buy the Card Wallet in our front office in Graz or in Vienna at the House of Nakamoto.

How much does the Card Wallet cost?

The price is 59,99 Euro, VAT included.

How is the Card Wallet delivered?

The Card Wallet is sent directly from the Austrian State Printing House by registered mail to the end customer.

In which cases can I use the Card Wallet?

The Card Wallet is an ideal solution for secure long-term offline storage of Bitcoin. Its characteristics make it easy to give, transfer, or inherit your Bitcoin, as the Card Wallet transforms them into a physical good. The Card Wallet is ideal for those who have not had any experience handling cryptocurrencies so far.

I'm an Bitcoin expert, can't I just generate private keys myself?

Not relying on a third party to generate private keys always is the best option – assuming you have the technical expertise. If you know what needs to be done to generate private keys in a secure way and also know how to create a long-term storage, then doing this all on your own would be the best option. For the rest of the population and especially for Bitcoin novices the Card Wallet is a good alternative, because it does not require any technical expertise.

Is the Card Wallet suitable for short-term storage of Bitcoin?

The Card Wallet’s purpose is to keep Bitcoin safe for long periods of time. The Card Wallet is not suitable for the short-term storage or the regular sending of Bitcoin, hardware wallets are a good alternative in this case.

Can I use the Card Wallet for transactions, similar to a debit or credit card?

No. The Card Wallet is not a credit or debit card and can not be used at POS terminals. It neither contains a chip nor a magnetic stripe.

How can I transfer or sell Bitcoin stored on the Card Wallet?

Uncover the private key and import it into a digital wallet to access your Bitcoin. Once you have imported the private key, you can transfer your Bitcoin to other addresses or an exchange. Always make sure that no outsider set eyes on the private key. If you need assistance, you can always come to our office in Graz personally with your Card Wallet, so that we can guide you through this process. For an appointment please contact us first.

Is the Card Wallet also available for other cryptocurrencies?

During the market launch, the Card Wallet is only available for Bitcoin. A version for Ethereum is planned for the future, more crypto currencies will follow.

What differs the Card Wallet apart from Hardware Wallets?

Hardware Wallets are certainly a good alternative and preferable in terms of security compared to online wallets or smartphone wallets. Long-term safekeeping of Bitcoin with hardware wallets is quite possible, but these points should be considered:
- The secure installation of a hardware wallet requires a certain technical knowledge.
- Hardware Wallets need to be updated regularly.
- The necessary interfaces (for example USB) may not be longer available in the future.
- Hardware wallets are not immune to attacks, see https://wallet.fail/
The Card Wallet reduces Bitcoin to the essentials - the private key, which is stored completely without hardware dependencies and is easy to read out – even in decades.

What is a private key?

The private key serves as a proof of ownership for the stored bitcoins across to the Bitcoin network. The private key signs transactions, which then are validated by the Bitcoin network. Without the possession of the private key, access is not possible.

What is the private key made of?

The private key is a random 256-bit number. This is an enormous space of numbers and in a truly random choice it is virtually impossible that the same private key is generated twice. But it is very important that the random number generator actually generates random numbers and not just pseudo-random numbers.

What is Secure Entropy Technology (SET)?

To generate the private keys, several independent random number generators are used. The SET defines how multiple entropy sources can be mixed to generate the random number and validates at the same time that all entropy sources have actually been included in the generation of the random numbers. This means that even if all but one entropy source were undermined or buggy, the random numbers are still completely secure and random. The SET prevents targeted attacks by an infiltrated random number generator as well as any unintentional errors in the generation and processing of the random numbers. The generated card wallets are checked by random samples. Any deviation that suggests the random numbers have been manipulated leads to the complete destruction of the batch and leads to further surveys of the cause.

Is the private key saved?

The private key printed on the back of the card exists exclusively on the respective Card Wallet, there exists no copy of the private key. The generated key never leaves the production machine and can not be viewed by employees at any time. All data carriers of the machine are deleted at the end of a production process using secure procedures.

Can the Bitcoin holdings of the Card Wallets be monitored by Coinfinity or the Austrian State Printing House?

Even the public Bitcoin address printed on the front side exists solely on the Card Wallet and is saved nowhere else. There is no way to monitor the Bitcoin holdings of the Card Wallets.

How can I check the authenticity of the Card Wallet?

All informations about the security features of the Card Wallet can be found at: https://www.cardwallet.com/start/

Is the Austrian state printing house in state ownership?

No, the "Österreichische Staatsdruckerei GmbH" is a privately owned company, not a state-owned institution.

Which payment methods are available?

We accept payments via Bitcoin, eps, giropay and credit card. You can find an overview as well as further explanations on our page for payment methods.

Do I need an account?

No account is needed for buying a Card Wallet.

Which personal data is saved?

Name, address (for delivery), e-mail address (for order confirmation and invoice), IP (user and server optimization) and banking details (during payment process). Further information can be found in our privacy notice.