1

Is there some kind of IOTA C library just for signing transactions? The IOT device in question does not have Wifi and is too weak computationally to do POW.

I want the device itself sign the tx so that I can "prove" that the data in the transaction came from that specific device.

2

Yes, there is one: https://github.com/embedded-iota/iota-c-library You probably want to checkout the fork by francescolavra. He fixed a lot of issues and improved the library. If you want to use it within an RTOS, you might want to checkout the library implementation in RIOT.

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