In order to ensure the security of hardware wallet, the usability will always be inevitably sacrificed through the designing process. NFC, short for Near Field Communication, has turned out to be a very effective solution for careful balancing of hardware wallets’ security and usability.

As a short-range high-frequency wireless communication technology , NFC allows non-contact point-to-point data transfer (within 10 centimeters) between electronic devices to exchange data.

Based on the natural security of near field communication, NFC technology is considered to be a perfect display of the principle “Authorization under Security Distance”, since it is a standard for close-range secure communication. Besides, NFC adopts unique signal attenuation technology, which has the characteristics of short distance, high bandwidth and low energy consumption. That is what ColdLar hardware wallet is bringing to the table.

Based on the unique framework, Coldlar wallet is made up of an offline device and an online smartphone app. The offline device is responsible for the creation and signature of the transaction, while the online app takes care of transaction broadcast and balance check. The question then arises, “How is the data transmission between the offline device and online app secure?”

Security transmission by QR Code is applied to solve this problem as it can completely eliminate the security risk; the usability, however, may not seem so perfect especially for the miners. Sometimes they need to scan dozens of QR Codes to finish the transmission. Now, with the implementation of NFC functionality to the ColdLar wallet, life has become a little easier and simplified. Users can select the NFC option and touch the wallet device and smartphone with the app together. Once there is a beep sound, the transmission is complete.

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