Sentinel Protocol is the first crowdsourced threat intelligence platform built on the blockchain. It collects and analyzes real-time hacks, scams, and fraud information for improved security of crypto assets and shares such intelligence to crypto exchanges, wallets and payment services using decentralized Threat Reputation Database (TRDB). The ecosystem disincentivizes malicious behavior by preventing the use of stolen cryptocurrencies while incentivizing security professionals get rewarded for their contributions.