We’re talking about an open-source wallet that can be integrated with smartphones. Square, a US-based financial services and digital payments company, is considering building a hardware wallet for bitcoin. Ease of use is one of the main requirements for the project. The main goal pursued by the developers is to make bitcoin storage more widespread. The company will focus on mobile wallet use and the concept of assisted-self-custody. The team will be led by Max Guise, head of device security at Square.