// Hadiah untuk pengganda sudut :
int64_t GetProofOfStakeReward(const CBlockIndex* pindexPrev, int64_t nCoinAge, int64_t nFees)
{
    int64_t nSubsidy = 2 * COIN;

    if(pindexPrev->nHeight >= 30000 && pindexPrev->nHeight <= 130000){
      nSubsidy = 40 * COIN;
    } else if(pindexPrev->nHeight >= 130000 && pindexPrev->nHeight < 150000){
      nSubsidy = 20 * COIN;
    } else if(pindexPrev->nHeight >= 150000 && pindexPrev->nHeight < 175000){
      nSubsidy = 10 * COIN;
    } else if(pindexPrev->nHeight >= 175000 && pindexPrev->nHeight < 200000){
      nSubsidy = 5 * COIN;
    }

    return nSubsidy + nFees;
}