What having a blockchain implies?

• storage costs : everyone maintaining the ledger needs to store every transaction
• bandwith costs : everyone has to broadcast every transaction
• computational costs : every node has to validate the blockchain
• control : the creator does not control the blockchain, everyone collectively controls it
• developpement costs : developping on a blockchain is way harder than on a traditionnal database

What to ask a business when they tell you that they are using a blockchain?

When a business is telling you about their innovative technology leveraging the power of the blockchain this should immedialty spake some questions :

• What is the consensus algorithm?
• who is responsible for validating the consensus rules?
• what is the nature of the participation ?
• is it open to access?
• is it open to innovation?
• is it a public ledger?
• is it transparent?
• does it improves acountability?
• is it cross borders?
• how is it validated?