Conceivable is to integrate a Truste Execution Environment (TEE) into the ASIC chips used in the mining process. The TEE then maintains an idle log based on hardware parameters such as power consumption and hardware temperature. The TEE also timestamps and verifies the log and securely signs and transmits it to the blockchain, either at regular intervals or upon verification requests from the verifier.

Regular hardware reviews and audits could enhance the system's resilience against tampering and ensure the integrity of idle proofs. Other implementations using network analysis or even physical inspection are also conceivable. Verification of green transactions does not have to be immediate and can be approved with some delay.