Proposal and performance evaluation of private key management method in cryptocurrency wallet

Abstract

Companies that use bitcoin, one of the cryptocurrency, in transactions are increasing, but losses in the event of leakage on the private key are inevitable.
The existing hardware wallet (Hardware wallet : HW) that manages the private key can be used even when the host is connected to the Internet, and there is a risk of illegal operation on the HW by the bot.
Therefore, we propose a protocol that allows the host to use the hardware by confirming disconnection from the Internet, and compare the execution time of conventional transaction generation with the proposed method.
As a result, although the overhead exists in the proposed method over the conventional method for generating transactions, we report that the security improves.