Page 43 - U4SSC Blockchain for smart sustainable cities

All this takes place in a context in which The main asset is digital and requires maintaining
vulnerable citizens obtain services from multiple a permanent record of the information about
agencies that are not allowed to share personal the debt; however, it is not necessary to keep the
data among them. The solution needs to be sensitive and personal data as well as any other
easy to implement and to integrate with existing volume of non-transactional data. Even though
legacy systems. Within this use-case, there are the users here are known, the control by the CJIB
multiple actors that are not connected and do is required and there is no need to implement
not necessarily trust each other. Under these a contractual relationship to share the access.
circumstances, it is necessary to remove the The proposed solution is looking to contribute
intermediaries. to economic, as well as social sustainability by
improving financial inclusion.

Lessons learned and conclusions:

• Blockchain technology allows for self-sovereign identity management and verification of own-
er-shared data without compromising privacy.
• There appear to be promising technical solutions that can give individuals control of their personal
data, comply with privacy laws and allow for data sharing that will improve government services.

Based on the technical properties required, blockchain is a suitable technology but not necessarily the
most relevant in this context. Some of the challenges and opportunities of blockchain for this case-
study have been elaborated on below.

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b Zero-knowledge proof in the context of cryptography is a special algorithm for identity verification (IEEE, 2010).

U4SSC: Blockchain for smart sustainable cities 33