// coin stake reward
int64_t GetProofOfStakeReward(const CBlockIndex* pindexPrev, int64_t nCoinAge, int64_t nFees)
{
    int64_t nSubsidy = 0 * COIN;
	if (pindexBest->nHeight+1 > 1000 && pindexBest->nHeight+1 <= 20000)
	{
		nSubsidy = 10 * COIN;
	}
	else if (pindexBest->nHeight+1 > 20000 && pindexBest->nHeight+1 <= 100000)
	{
		nSubsidy = 5 * COIN;
	}
	else if (pindexBest->nHeight+1 > 100000 && pindexBest->nHeight+1 <= 500000)
	{
		nSubsidy = 3 * COIN;
	}
	else if (pindexBest->nHeight+1 > 500000 && pindexBest->nHeight+1 <= 800000)
	{
		nSubsidy = 2 * COIN;
	}
	else if (pindexBest->nHeight+1 > 800000)
	{
		nSubsidy = 1 * COIN;
	}
	
    return nSubsidy + nFees;
}