if (timestamp == null) {
    timestamp = this.#adjustedTime(previousHeader.timestamp);
  }

  return new RuntimeBlock(
    Quantity.from(previousNumber + 1n),
    previousBlock.hash(),
    this.coinbase,
    minerOptions.blockGasLimit.toBuffer(),
    BUFFER_ZERO,
    Quantity.from(timestamp),
    minerOptions.difficulty,
    previousHeader.totalDifficulty,
    Block.calcNextBaseFee(previousBlock)
  );

const block = new RuntimeBlock(
  Quantity.from((parentHeader.number.toBigInt() || 0n) + 1n),
  parentHeader.parentHash,
  parentHeader.miner,
  tx.gas.toBuffer(),
  parentHeader.gasUsed.toBuffer(),
  parentHeader.timestamp,
  options.miner.difficulty,
  parentHeader.totalDifficulty,
  0n // no baseFeePerGas for estimates
);