I got the concept of Blockchain and all the merits which a lot of people are talking about. But in real business, a lot of changes are inevitably happening, so 'immutability' itself seems to be a contradictory from this perspective. If we cannot change anything in real business in real time then what's the benefit of blockchain? Does it mean that blockchain is only good for the business which does not bring any change in every aspect of it? I can understand that it is the good thing if someone cannot change the supply chain as promised, but sometimes we need to change the supply chain itself to meet the customers' needs and business change?