Which of the following is NOT a key feature of smart contracts?

Smart contracts are a significant component of blockchain technology, designed to automate and enforce agreements without the need for intermediaries. Key features of smart contracts include the ability to encode the terms of the agreement into software, enabling automatic execution when specific conditions are met and allowing them to function without third-party intervention.

The option that highlights manual issuance of contract enforcements stands out because it contradicts the core purpose of smart contracts. Smart contracts are meant to eliminate the need for manual intervention, streamlining processes to ensure that once the specified conditions in the contract are met, actions such as payment transfers or execution of services occur automatically.

The other options accurately describe essential characteristics of smart contracts. They are coded in software, which allows for precise and unambiguous terms, and they self-execute according to the predetermined rules established in the code, functioning as efficient tools for automating agreements.