Blockchain is a type of distributed ledger. A wide range of consensus algorithms exists to reach consensus in a decentralized manner. However, most of them trade energy consumption for a degree of openness. Blockchains are primarily used for tokens and cryptocurrencies. Often the process of minting new tokens depends on actionable real world behaviors. A difficulty persists in securely translating said behavior into a decentralized blockchain. We formalize the generic concept of Proof of Behavior (PoB), and use it to create a consensus mechanism for generic permissionless blockchains.