Zcash's Network Sustainability Mechanism began operating with the NU7 upgrade on November 6, but nearly all of its opening balance came from funds that had accumulated before the new fee policy took effect. The distinction matters because the reserve is intended to support future block subsidies, not to function as a newly funded treasury or an immediate levy of hundreds of ZEC on current users.

A large historical seed

ZIP 237, the specification that established the reserve, set an initial balance of 368.58445520 ZEC. That amount represents unclaimed block subsidies and transaction fees from before the NU6 upgrade. The protocol had not assigned those funds to a recipient, so NU7 moved the historical value into the new reserve at activation block 3,543,405. It did not come from a one-time transfer by a foundation, company or exchange.

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CryptoSlate calculated that the reserve held 369.70340585 ZEC at block 3,547,068 on November 7. Subtracting the historical seed left 1.11895065 ZEC from fees collected after activation, meaning the seed still represented about 99.7% of that snapshot. Live full-node data from ZEC Stats showed 370.5459 ZEC in the reserve when The Token Press verified the figures, including 1.9615 ZEC in post-NU7 fee contributions. Those live totals will keep changing as blocks are mined.

How the fee split works

Under ZIP 235, 60% of the aggregate transaction fees in each block is removed from the amount available to the miner and credited to the reserve. Miners receive the remaining 40%, with rounding handled in the miner's favor. The change does not add a separate 60% surcharge to a user's transaction and does not introduce a new transaction format. It changes how the fees already attached to transactions are distributed after a block is accepted.

The reserve sits outside Zcash's Issued Supply while it accumulates. It is therefore neither circulating ZEC nor a conventional account that an organization can spend. The mechanism also does not permanently burn the funds: its design calls for the balance to be reissued later as part of the block subsidy.

No payouts for years

ZIP 259 schedules the first reissuance at block 8,939,664. Until that height, the reserve only receives its historical seed and the designated share of fees. Once reissuance begins, the protocol will combine reserve distributions with newly issued ZEC under a revised subsidy schedule. The long delay separates today's fee collection from the future security budget it is intended to support.

What the early numbers show

The opening snapshots show that the reserve's headline balance is not yet a measure of fee demand. At verification, less than 2 ZEC came from transactions processed since NU7, while more than 368 ZEC came from the historical allocation. Daily figures are also incomplete until each UTC day closes, so short windows should not be treated as a stable fee trend.

The mechanism gives Zcash a defined pool that could supplement miner incentives as new issuance declines, but its eventual contribution depends on transaction activity, fee levels and the rules in force when payouts start. A larger reserve does not by itself prove stronger security, and the first days of collection cannot show whether the model will generate enough revenue over the long term.

Sources

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