The Network Sustainability Mechanism functions as Zcash's protocol reserve designed to top up block rewards for future miners over time

From the articleZcash grants committee drops plan to redirect 98,000 ZEC to future mining rewardsAlso in Zcash Community Grants Abandons Its Own Funding Cut, Leaves Dev Fund's Future to Governance - Unchained, Zcash Grants Committee Backs Down on Plan to Give Up 98,000 ZEC
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