I wonder how hard would it be to implement all required crypto primitives with POSIX AWK and all networking with nc, optionally with openssl s_client or its substitutes like busybox ssl_client. Imagine a system where you have nothing, not even a working compiler, only a Linux kernel and busybox/toybox binary (so you do have e.g. vi, awk, bc/dc and non-SSL wget and nc). Yet you need to have a crypto wallet. Which currency would you choose to implement it from scratch using only the tools provided within busybox/toybox?