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How blockchain could undermine censorship - forever

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On 26 October, someone stored a link to the video in a transaction of the cryptocurrency ZCoin. Cryptocurrencies use blockchain technology, which is essentially an online system of recording transactions simultaneously on multiple computers using what’s called “blocks”. Because it’s recoded in many places, it can never be entirely removed – even by the person who initiated the transaction. Through block number 111089, the Thai rap video is now visible to anyone, anywhere.

Marc Rocas, a board member of the non-profit association Blockchain Catalunya, said that information in the blockchain cannot be deleted while the network is running: “In order to shut down a blockchain network, you have to shut down all the devices, all the servers, all the computers that are running this blockchain.”

Block number 111089 carries only a link to the video, which is actually stored on the InterPlanetary File System (IPFS). IPFS acts as a type of alternate internet where content is not centrally stored, just as blockchain is stored on many computers. This means that, in order to fully remove the video, authorities would need to shut down all servers containing the blockchain as well as all servers containing the IPFS.

From How blockchain could undermine censorship - forever.

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