Bitcoin has emerged as the most recognisable cryptocurrency due to its usages as a speculative asset,medium of exchange and store of value. The fundamental characteristics of trustless and secure soundmoney have made it appealing to people. As a result of the immutability of Bitcoin, monetary lossescaused by user security mistakes such as lose possession of private keys may hinder Bitcoin usage. Wesurveyed 339 Bitcoin users to explore the interaction between individuals and the technology of Bitcoinof how they safeguard their Bitcoin private keys. The results showed that users employed technologiesto enhance the protection of their Bitcoin private keys, such as encryption and multi-signature. However,a proportion of users employed less secure approaches. The study results suggest that users preferencrypting their private keys rather than multi-signature due to convenience and ease of use. Hardwarewallets were moreover the most used wallet by the participants. 

Several governments employed digital contact tracing using smartphone apps to combat the COVID-19 pandemic in 2020. Research shows that privacy concerns hinder the adoption of such apps, while privacy problems which emerged by using them are empirically unknown. This study aims to uncover the dimensions of privacy problems available in digital contact tracing through a survey from 453 citizens in Sweden. Our results show that respondents found privacy problems regarding surveillance, identification, aggregation, secondary use, disclosure, and stigma highly relevant in contact tracing apps. Among demographic factors, younger respondents were generally more concerned about privacy risks than older respondents. This study extends previous literature by revealing privacy problems arising from contact tracing apps.