First thought is academic proof of work. Or to protect readers of news by alerting if text was modified. Thats what i know about. Its active research. Mostly an

First thought is academic proof of work. Or to protect readers of news by alerting if text was modified. Thats what i know about. Its active research. Mostly anti-forgery tech. I ought to read into the ether world better myself though. So take my words with a grain of salt. A musing would be defending against malicious code injection ?