code: func (p *LSCCBasedBTLPolicy) GetExpiringBlock(namesapce string, collection string, committingBlock uint64) (uint64, error) {
  	btl, err := p.GetBTL(namesapce, collection)
  	if err != nil {
  		return 0, err
  	}
  	expiryBlk := committingBlock + btl + uint64(1)
  	if expiryBlk <= committingBlock { // committingBlk + btl overflows uint64-max
  		expiryBlk = math.MaxUint64
  	}
  	return expiryBlk, nil
  }
docs: // GetExpiringBlock implements function from the interface `BTLPolicy`