*5.1.5 Security challenge*

Blockchain is usually viewed as a reliable technology with characteristics, such as encryption, data immutability, and decentralization. However, this does not mean that blockchain is not vulnerable to cyberattacks and security fraud. People with malicious intent can exploit blockchain security vulnerabilities for their own benefit. There are already many cybersecurity incidents related to blockchain usage. For example, a cyberattack on Bithumb, a major cryptocurrency exchanges for bitcoin, and Ethereum caused an economic loss of 870,000 USD and the exposure of more than 30,000 users' information. The potential security threats could discourage firms willingness to use blockchain.
