code: func (mcs *ConsenterSupport) WriteBlock(block *cb.Block, encodedMetadataValue []byte) {
  	if encodedMetadataValue != nil {
  		block.Metadata.Metadata[cb.BlockMetadataIndex_ORDERER] = utils.MarshalOrPanic(&cb.Metadata{Value: encodedMetadataValue})
  	}
  	mcs.Append(block)
  }
docs: // WriteBlock writes data to the Blocks channel