code: func (mock *MockBlocksDeliverer) Send(env *common.Envelope) error {
  	payload, _ := utils.GetPayload(env)
  	seekInfo := &orderer.SeekInfo{}
  
  	proto.Unmarshal(payload.Data, seekInfo)
  
  	// Read starting position
  	switch t := seekInfo.Start.Type.(type) {
  	case *orderer.SeekPosition_Oldest:
  		mock.Pos = 0
  	case *orderer.SeekPosition_Specified:
  		mock.Pos = t.Specified.Number
  	}
  	return nil
  }
docs: // Send sends the envelope with request for the blocks for ordering service
  // currently mocked and not doing anything