OriginStamp

OriginStamp is a non-commercial trusted time-stamping service that can be used free of charge and anonymously.

Trusted time stamping enables you to prove that you were the originator of an information (e.g., text or any other media file) at a certain time. You can drag and drop any file to the main window, and OriginStamp will calculate the SHA256 Hash. You can then send this hash to the originstamp.org server, and it will be permanently written on the blockchain.