code: func (lc *LedgerCommitter) LedgerHeight() (uint64, error) {
  	var info *common.BlockchainInfo
  	var err error
  	if info, err = lc.GetBlockchainInfo(); err != nil {
  		logger.Errorf("Cannot get blockchain info, %s", info)
  		return uint64(0), err
  	}
  
  	return info.Height, nil
  }
docs: // LedgerHeight returns recently committed block sequence number