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A new product that provides a GDPR blockchain solution can support the "right to oblivion" and the writing of data 
The Macro 4 product now uses the blockchain to overcome the challenge of the right to oblivion – effectively providing a GDPR blockchain solution
It seems we are seeing more practical applications of blockchain almost by the day. Now Macro 4, which provides enterprise content management software, has applied the technology to help counter compliance by releasing a GDPR blockchain solution, Columbus DW 8.4.
With the GDPR, and indeed other privacy facilities launched around the world, such as in Brazil, Canada and California, the "right to oblivion" and the writing of data are key elements.
The right to oblivion in itself creates a dilemma. How companies demonstrate that they have respected the wishes of those affected and have deleted their personal data in the appropriate manner.
The drafting of data, which involves the removal or replacement of some sensitive or anonymous data or pseudonyms, poses its technical challenges.
The Macro 4 product now uses the blockchain to overcome the challenge of the "right to forget", effectively providing a GDPR blockchain solution. It also provides a data editing solution.
As Macro 4 said: "One of the fundamental requirements of a legal archive is the ability to capture all the events that occur around the documents that are being held and to validate those events with the same level of integrity and security of the document itself. for example, if customers exercise their "right to oblivion" under the GDPR you need a reliable record of the fact that you have deleted their data. "
Columbus DW provides a solution providing absolute proof that what should happen has actually happened by recording it on the blockchain.
How can blockchain help companies meet GDPR provisions?
Blockchain technology, like a public and distributed ledger, if applied correctly to data and identity management can help companies meet the provisions of the GDPR
Blockchain GDPR: "The right to oblivion"
It does so by introducing the possibility of recording document-related events using the same anti-tampering hashing mechanism as blockchain, with the possibility of activating business processes or e-mail notifications when events occur. It then allows you to execute the same record on the blockchain to independently verify that the information has not been tampered with.
Jim Allum, Commercial and Technical Director of Macro 4, explained: "By checking the locally stored hashes in the Tamper audit log with the hashes registered on the tamper-proof blockchain, it is possible to prove conclusively that nothing It has been changed. "
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Drafting: data rendered anonymous and made anonymous
The product also allows organizations to prevent the display of sensitive text or images using a variety of drafting methods that include replacing selected content with random characters, & # 39; X, black boxes, or empty space.
Reduced views can be applied to all users or to certain roles or individuals.
Allum explained: "It is possible to limit access to sensitive data only to staff who actually need to see it as a legitimate part of their work, in line with the GDPR data minimization principle.
"Do a call center agent or an account administrator really need to see information such as a payment history or financial status of a person when viewing invoices or contracts, for example, if not, then it's best to do so to reduce it."
The anonymisation of data can be provided by replacing text with random but similar characters to produce realistic documents for in-depth tests, without exposing any real business data.
Blockchain and privacy: a form of distributed ledger can solve the problem of privacy?
We have a privacy problem. GDPR is an attempt to deal with this, but it is fighting an apparently inexorable force. For many, both for users and for data processors, the GDPR solution seems to be a trick. In particular, it is a problem for users, many of which simply end up clicking "yes" or "accept" instead of being forced to read the privacy policy and decide which advertisers are willing to grant.
The usual contradiction between GDPR and blockchain
The privacy experts have argued that there is a contradiction between GDPR and blockchain since the data stored on a blockchain are considered immutable, which makes it seemingly impossible to eliminate, making it seemingly impossible to respect the "right to oblivion" requirement according to GDPR.
The Macro 4 solution, however, is not affected by this limitation because it uses blockchain to store very specific information that would not create privacy implications.
Looking beyond the Macro 4 product, if a blockchain is used to store personal data, it is possible to overcome the problem of the "right to oblivion" through certain types of blockchain. An example of a blockchain compatible with GDPR could be that which involves a limited network of computers, which can "vote" to make changes to the ledger.
