Public Blockchain versus Private Blockchain: Issues and Limits.

Summary Blockchain is a very popular topic in the banking and insurance industry, what is it about? The notion of blockchain comes from cryptography and it is a protocol allowing to transmit information in a secure way. We will distinguish two approaches, the decentralized public approach and the centralized private approach. The concept of blockchain appeared thanks to the emergence of crypto-currencies and in particular of Bitcoin. If blockchain is to become an important tool within banks, then it is necessary to have a fair knowledge of the underlying tools and the issues associated with this new technology. Indeed, it appears necessary to identify the risks associated with it and to propose strategies to control them.