I need to store pdf hash in blockchain to prove my pdf existence. I thought to use blockchain, but public blockchain required some fee ... I don't really understand if ethereum could be my solution... Can I use ethereum for store hash for free ? And if ethereum can be use to prove work ?

closed as unclear what you're asking by niksmac, galahad, eth Aug 9 '16 at 22:42

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.


No, you cannot use the main net of Ethereum for free. See this answer for how you can use the Ethereum block chain in conjunction with a third party to store the hash of your .pdf.

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