Today, Coin announced that it will offer up an Arduino Bluetooth Low Energy module that's designed to be small and easy to integrate into hardware hacks and products of all kinds.

The Arduino Nano 33 IOT has an ESP32 onboard (WiFi + Bluetooth) and crypto onboard with the uBlox NINA-W10. I guess the BLE versions dissipate less power than the ESP32/uBlox NINA-W10 version ...