Security vulnerability of blockchain

The task of the paper is to choose a security vulnerability of blockchain, only one and then finding an alternate solution to it. The security vulnerability can be any vulnerability found in blockchain, not necessary the most common. The solution that you’re going to provide has to be new and not yet done before. It has to be creative, and not found on the internet. Please I need diagrams and formulas and explanations with intricate words as to why this solutions is good for the security vulnerability that you’re going to choose.