How does IPFS relate with Ethereum?

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From @Piruzzolo on Sun Apr 03 2016 13:05:45 GMT+0000 (UTC)

Could you give an overview of how these two technologies could work together (if possible at all)?
Can Ethereum lay upon IPFS?


Copied from original issue: How does IPFS relate with Ethereum? 路 Issue #107 路 ipfs-inactive/faq 路 GitHub

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You can store IPFS Hash in smart contract. Suppose you want display any important file/document. You can leverage immutability of Ethereum Smart contract and store ipfs hash of that file.