  Threat information sharing is considered as one of the proactive defensive
approaches for enhancing the overall security of trusted partners. Trusted
partner organizations can provide access to past and current cybersecurity
threats for reducing the risk of a potential cyberattack - the requirements for
threat information sharing range from simplistic sharing of documents to threat
intelligence sharing. Therefore, the storage and sharing of highly sensitive
threat information raises considerable concerns regarding constructing a
secure, trusted threat information exchange infrastructure. Establishing a
trusted ecosystem for threat sharing will promote the validity, security,
anonymity, scalability, latency efficiency, and traceability of the stored
information that protects it from unauthorized disclosure. This paper proposes
a system that ensures the security principles mentioned above by utilizing a
distributed ledger technology that provides secure decentralized operations
through smart contracts and provides a privacy-preserving ecosystem for threat
information storage and sharing regarding the MITRE ATT\&CK framework.
