Excel, Secure Microcontrollers, and Open Source Development

In this chapter, they discuss the function of Excel in generating randomness for a hardware wallet, their plans for using a secure microcontroller, and designing boards as a drop-in replacement. They also mention the cost of microcontrollers, their limited sale of a developer kit, and potential future developments like mini-script and the liquid network. Additionally, they discuss the RISC-V instruction set, its advantages for open hardware, and projects like pre-cursor and Xecced.