public Optional<PoWSolverInputs> getWorkDefinition() {
    return minerBlockCreator.getWorkDefinition();
  }
Provides the proof-of-work specific aspects of the mining operation - i.e. getting the work
definition, reporting the hashrate of the miner and accepting work submissions.

<p>All other aspects of mining (i.e. pre-block delays, block creation and importing to the chain)
are all conducted by the parent class.
ethereum/blockcreation/src/main/java/org/hyperledger/besu/ethereum/blockcreation/PoWBlockMiner.java