Sentinel Protocol by Uppsala Security is a blockchain-based crowdsourced threat intelligence platform that utilizes AI, blockchain technology, and machine learning to protect digital assets from cybercrime. It allows users to report suspicious cyber incidents such as malware, hacks, phishing scams, and fraud through the Sentinel Portal. The reported data is reviewed and validated by security experts known as Sentinels, and then published onto the blockchain via the Threat Reputation Database (TRDB) for real-time access to crowdsourced information on the latest security threats. The platform incorporates a decentralized ecosystem that stores and shares curated threat intelligence data, including whitelists and blacklists. Sentinel Protocol provides various Defence Security and Threat Intelligence solutions, enabling quick dissemination of critical cybersecurity information to individuals, companies, security organizations, and governments.