code: func BlockDataHashingStructureValue() *StandardConfigValue {
  	return &StandardConfigValue{
  		key: BlockDataHashingStructureKey,
  		value: &cb.BlockDataHashingStructure{
  			Width: defaultBlockDataHashingStructureWidth,
  		},
  	}
  }
docs: // BlockDataHashingStructureValue returns the only currently valid block data hashing structure.
  // It is a value for the /Channel group.