Blockchain technology can absolutely be applied to documents. For example (URL source below) a lawyer wrote an article for bravenewcoin.com about how blockchain can prove the existence of a document without revealing the contents of the document. Programs such as medicalchain.com plan to use blockchain technology to securely store and maintain health records. It is also possible (URL source below) to use blockchain technology to help secure online copyright protection.

Sources:

https://bravenewcoin.com/news/using-blockchain-technology-to-prove-existence-of-a-document/

https://abovethelaw.com/2018/02/how-blockchain-just-may-transform-online-copyright-protection/

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