Base

Is blockchain secure?

   Once a block is added to the end of the blockchain, it is very difficult to go back and change the content of the block.    Because each block contains its own hash and the hash of the block before it.    Hash codes are created by a mathematical function (hash function).

Lingo

While blockchain technology offers robust security features, it is not completely immune to vulnerabilities or attacks.Potential security risks include 51% attacks, where a single entity gains control of the majority of the network's computing power,as well as vulnerabilities in smart contracts and blockchain protocols