A blockchain security engineer is a professional who specializes in ensuring the security of blockchain technology. They are responsible for identifying and addressing potential vulnerabilities and threats to the blockchain network.

As for the 15 features/advantages of a blockchain security engineer, here are some key ones:

1. Expertise in cryptography: A blockchain security engineer possesses a deep understanding of cryptographic principles and algorithms used in blockchain technology.

2. Knowledge of blockchain protocols: They are well-versed in various blockchain protocols and can assess their security implications.

3. Threat detection and prevention: They have the skills to identify and mitigate potential security threats to the blockchain network.

4. Secure coding practices: A blockchain security engineer follows best practices for writing secure code to prevent vulnerabilities.

5. Network security: They understand network security concepts and can implement measures to protect the blockchain network from attacks.

6. Incident response: In the event of a security breach, a blockchain security engineer can respond quickly and effectively to minimize damage.

7. Risk assessment: They can assess the potential risks associated with blockchain technology and implement appropriate security measures.

8. Compliance knowledge: A blockchain security engineer is familiar with regulatory requirements and can ensure compliance within the blockchain network.

9. Continuous monitoring: They implement monitoring systems to detect any suspicious activities or anomalies within the blockchain network.

10. Security audits: They conduct regular security audits to identify any weaknesses or vulnerabilities in the blockchain system.

11. Secure key management: A blockchain security engineer ensures the proper management and protection of cryptographic keys used in the blockchain network.

12. Secure smart contract development: They have expertise in developing secure smart contracts, minimizing the risk of vulnerabilities.

13. Collaboration with developers: They work closely with blockchain developers to ensure security is integrated into the development process.

14. Knowledge of consensus mechanisms: They understand different consensus mechanisms used in blockchain networks and their security implications.

15. Stay updated with emerging threats: A blockchain security engineer keeps up with the latest security threats and trends in the blockchain industry to proactively address them.