Last week I wrote about the upcoming GDPR and mentioned that it posed a potential risk for Blockchain-based technologies:
The more I think about it, the more I see the GDPR posing a problem for a Blockchain’s permanent, irreversible and inerasable ledger whenever any personal data (even when encrypted) is included in a node. Individuals will have the right to delete their data and be forgotten. If one of the values of Blockchain technology is that no one person or entity can modify a node, then the Blockchain will need to modify its architecture and governance to allow for such node modification. And if it is a public Blockchain with no centralized intermediation, then who is the data controller? And who will be able to delete your data upon your request and protect your rights? Will each miner become a data controller, potentially subject to fines?
Just now I read that Blockchain is on a collision course with the new GDPR, making my same exact point:
The bloc’s General Data Protection law, which will come into effect in a few months’ time, says people must be able to demand that their personal data is rectified or deleted under many circumstances. A blockchain is essentially a growing, shared record of past activity that’s distributed across many computers, and the whole point is that this chain of transactions (or other fragments of information) is in practice unchangeable – this is what ensures the reliability of the information stored in the blockchain.
For blockchain projects that involve the storage of personal data, these two facts do not mix well. And with sanctions for flouting the GDPR including fines of up to €20 million or 4 percent of global revenues, many businesses may find the ultra-buzzy blockchain trend a lot less palatable than they first thought.
€20 million is a great incentive for technologists to find creative ways to keep personal data outside of their Blockchain aspirations. Start the brainstorming now!