If you (or your family, or an old backup drive) hold ZEC in a Sprout address - a z-address starting with "zc" created before 2018 - the clock is now ticking. Under ZIP 259, adopted for the NU7 network upgrade, the Sprout pool is being retired: after November 5, 2026, Sprout notes can no longer be spent on the Zcash network.
This is not a drill and not a fork scare. It is a scheduled, deliberate retirement of the oldest privacy pool in Zcash, and there is a safe, well-documented migration path. Here is everything you need to know, in plain language.
What is the Sprout pool, exactly?
Sprout was the very first shielded pool of Zcash, live since the genesis block in October 2016. Addresses starting with "zc" belong to this pool. In late 2018 the Sapling upgrade introduced a new generation of shielded addresses ("zs" and later unified "u" addresses) that are dramatically faster, lighter and cheaper to use. Since then, the ecosystem has moved to Sapling and Orchard, and virtually every wallet, exchange and service dropped Sprout support years ago.
Being old is not a problem by itself. The problem is maintenance: Sprout relies on heavyweight cryptographic circuits that are expensive to verify, painful to keep secure, and a standing burden for every full node operator. Keeping a barely-used, decade-old proving system alive forever is a net liability for the whole network. ZIP 259 ("sunlight for Sprout") solves this the clean way: set a firm deadline, give everyone years of notice, and retire the pool.
The deadline: November 5, 2026
After the NU7-related activation date, Sprout notes stop being spendable. Not frozen, not confiscated - simply no longer transferable on-chain, like money in a safe whose lock mechanism no longer exists. Anything still sitting in a Sprout address after the deadline becomes effectively unreachable.
The important nuance: the funds are not destroyed in a dramatic way and there is no "claim window" later. There is no recovery after the deadline. The only move that counts is migrating your Sprout notes to Sapling or Orchard BEFORE November 5, 2026.
How to move your funds (step by step)
Step 1. Inventory your old wallets. Look for addresses starting with "zc" - they usually live in old zcashd/zcash-cli installations, old Zcash4win/Zcash4mac exports, exchange-era wallet files from 2017-2018, or paper backups from the early days.
Step 2. Sync or restore. The honest warning: a fresh full-node sync of an old zcashd wallet can take a long time, because Sprout note discovery requires scanning a lot of history. Start now, not on November 3rd. If your machine is slow, use a wallet or service that supports Sprout imports without a full local scan.
Step 3. Migrate to a modern address. From zcashd, the standard tool is the built-in Sprout migration: z_getoperations / the zcashd migration feature, or explicitly z_mergetoaddress from your "zc" address into a Sapling "zs" address or a unified "u" address. Modern GUI wallets that support Sprout-to-Sapling/Orchard migration handle this with a button press. Move to an address whose wallet you actually control and back up.
Step 4. Verify, then verify again. Send a small amount first, confirm it landed in the new wallet, then move the rest. Write down the new seed phrase. Check the receiving address character by character.
Step 5. Consider your privacy. If you want to keep the shielded nature of your funds (you probably do, since you used Sprout in the first place), migrate shielded-to-shielded: Sprout to Sapling or Sprout to Orchard. Going to a transparent t-address should be reserved for cases where you need exchange deposits - and even then, modern exchanges increasingly accept shielded deposits directly.
What happens if you do nothing?
After the deadline your Sprout notes simply cannot be spent or moved. There is no support desk that can un-freeze them, no hard-fork rollback planned, and no second chance. Statistically, a meaningful share of early ZEC will be lost this way - the same story as with every legacy chain upgrade. Do not become that statistic.
FAQ
Q: Is this a scam / is my ZEC at risk right now?
A: No. This is a consensus-scheduled upgrade documented in ZIP 259. Your Sprout notes are safe until November 5, 2026 - the risk starts the moment you procrastinate past the deadline.
Q: Do I need to move transparent (t-address) funds too?
A: No. The sunset applies to the Sprout shielded pool only. Transparent and Sapling/Orchard funds are unaffected.
Q: Will my migrated funds lose privacy?
A: Not if you migrate shielded-to-shielded. Sprout to Sapling/Orchard keeps the amount and destination private.
Q: I only have a seed phrase from an old wallet, no software. What do I do?
A: Restore that seed into a wallet that supports Sprout scanning (modern zcashd builds can do it; some third-party wallets support Sprout key import), then follow the steps above. Give yourself time for the scan.
Q: Where can I read the primary source?
A: ZIP 259 on the Zcash GitHub, plus the ZecHub wiki pages on Sprout and the network upgrades - they walk through the same steps with more technical depth.
Bottom line
If the words "zc1" or "Zcash4win" mean anything to you, spend one evening this week checking your archives. The migration itself is a routine operation - the only expensive mistake is missing the November 5, 2026 deadline.
If this guide saved you time, a ZEC tip is appreciated - and if you are migrating a larger legacy stash, you are exactly the reader this article was written for.