Is an embedded library for implementing ECC’s or ECDSA’s for 8, 32 or 64-bit processors and SOCs. The library is fully coded in C and contains optional pre-compiled curves for higher performance, the code is licenced under BSD-2 licence.
Micro-ECC
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ColdCard - a taxonomy
Another detail in their repo is the lack of git modules or any kind of synchronization with mainline repositories, from which they import libraries. Most significant is Micro-ECC, which implements ECC functions specifically for embedded devices.