HOWTO Move ZEC Out of Sprout: The Comprehensive Guide (Ironwood Era, September 2026)

HOWTO Move ZEC Out of Sprout: The Comprehensive Guide (Ironwood Era, September 2026)

Guide to smoothly move ZEC out of Sprout into Ironwood using Argos tool, detailed steps and safety measures included for seamless transition.

September 13, 2026· 22 min read
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HOWTO Move ZEC Out of Sprout: The Comprehensive Guide (Ironwood Era, September 2026)

"It's time to get out of the sprout pool."Zaki Manian, pointing to the tool at Argos.sovright.com. Argos recovers funds right on your computer (secrets are never sent anywhere) from old secret phrases, wallet.dat files and standalone Sapling/Sprout keys: it looks through the blockchain from its earliest days and moves what it finds to a modern Zcash address.

This guide explains in plain words how to move ZEC out of the old shielded pool Sprout into the current pool Ironwood. Inside: why it matters, preparation, the recommended step-by-step path using Argos, fallback options for advanced users, an honest look at privacy and security, troubleshooting, and FAQ.

Status at time of writing (14 September 2026): Ironwood (network upgrade NU6.3) is live since block 3,428,143 (~28 July 2026). The old zcashd software stopped on 18 July 2026 (block 3,417,100) and can no longer catch up with today's network. Use Argos version 1.1.0 or newer (latest seen: 1.2.0, 31 August 2026).


0. Short version

  1. Find your Sprout backup. A zc... address, a wallet.dat file, or an SK... Sprout key. ⚠️ The 24 secret words of ZecWallet Lite alone are not enough for Sprout (those keys were once created separately from the phrase) — you need the wallet file or a standalone key.
  2. Prepare a modern receiving wallet. Install an Ironwood Ready wallet (e.g. ZODL on your phone), write down its new secret phrase, copy the Unified Address (starts with u1...).
  3. Download Argos (a free desktop program that passed an independent security review) from argos.sovright.com → the Releases page on GitHub. Verify the file is genuine (see §6.1). Version must be 1.1.0 or higher.
  4. Open the file or key in Argos, scan the network, and move the money. Sprout funds land in Sapling first (the network rules require it). A from-scratch Sprout scan reads ~26 GB of old blocks and runs for hours — but you can interrupt it: it resumes where it stopped.
  5. Let the new wallet finish the second step on its own (Sapling → Ironwood). Keep it open and up to date; don't spend the whole balance mid-move.
  6. Once everything is confirmed — retire the old backup.

1. Why move now

  • Sprout is the first Zcash shielded pool (2016). A pool is like a separate compartment in the blockchain with its own accounting. Later came Sapling (2018), Orchard (2022), and now Ironwood (July 2026). Money never moves between compartments by itself — you start each crossing.
  • A hole was found in Sprout that could theoretically have allowed undetectable counterfeiting (found March 2018, closed by the Sapling release in October, disclosed publicly in February 2019). Nearly eight years later ~25,409 ZEC still sits in Sprout — the incident post-mortem called it "possibly abandoned or lost" (see the migration tracker). Don't add yours to it.
  • A similar hole was found in Orchard (found 29 May 2026 by the Shielded Labs team, fixed 3 June 2026) — which is why Ironwood exists: the same Orchard protocol, but with a mathematical proof of correctness and fresh reviews, plus a "turnstile" so anyone can verify there is no extra money in circulation.
  • Only coins in Ironwood can be rescued even if quantum computers one day break today's cryptography (the property is described in ZIP 2005). The spec says it directly: for money left in Sprout/Sapling/Orchard there will be no rescue — once those pools are switched off, it becomes unreachable.
  • The old "move" button is dead. The built-in Sprout→Sapling move in zcashd (the z_setmigration command, document ZIP 308) stopped working together with zcashd itself on 18 July 2026. Recovery now goes through a separate program.
  • Almost nothing understands Sprout today. Of the 34 wallets in the ZecHub catalog, only Argos and zecd support it. Everything else needs you to move the money out first.

There is no published deadline — the move is voluntary, and honest coins can be withdrawn at any moment whenever the owner decides to act. But the direction is clear: old pools are heading for shutdown, and the new guarantees exist only in Ironwood.


2. Pools and addresses — cheat sheet

How to read the table: the "prefix" is the letters an address starts with. It tells you at a glance where the money sits.

Pool Live since Address starts with Key looks like Status (Sep 2026)
Transparent From the start t... Ordinary private key / phrase Working
Sprout 2016 zc... (mainnet), zt... (testnet) SK... (mainnet), ST... (testnet) Old — move out
Sapling 2018 zs... Long key secret-extended-key-main1... Old — wallets move it onward to Ironwood themselves
Orchard 2022 u... (Unified Address) Unified spending key Closed to new incoming transfers — move
Ironwood 28 July 2026 Same u... — old addresses keep working Same keys you already had Current shielded pool

Important: no new secret phrase, no new address, and no coin swap are needed. Your keys fit both the old and the new pool. Only the "shelf" holding the balance changes — and you start each move yourself. There is no "move everything at once" button in the network.


3. Do you even have Sprout money?

  • Go through your backups: zc addresses, a wallet.dat file (from zcashd or old full-node software), a standalone SK key, paper notes mentioning "Sprout" / "z-address" from 2016–2018.
  • Shielded balances are invisible in block explorers. You cannot paste a zc... address into an explorer website and see money — only a check with the spending key shows it.
  • Quick check with ZODL: restore the old phrase in ZODL (a free phone wallet from Electric Coin Co.). ZODL shows only one address per phrase, so if you remember money but the balance is zero — it is almost certainly sitting on other addresses your old wallet generated, and Argos is built to find them. (Delete the test wallet after the check, see §11.)
  • If you only have a zc... address but no phrase, file, or key — the money cannot be recovered. No tool can help without the secret.

4. What you'll need (checklist)

  • The secret for Sprout recovery: the original wallet.dat and/or a standalone SK... key. (The 24 ZecWallet Lite words cover only transparent addresses, Sapling, and Orchard — not Sprout.)
  • A modern receiving wallet with Ironwood Ready status that gives you a Unified Address. Which one to pick — see the subsection below.
  • A trustworthy computer (macOS / Windows / Linux) with disk encryption, an up-to-date system, and internet access (Argos downloads public block data from dedicated servers, and for Sprout — full blocks from other network participants; it won't work on an offline computer).
  • Time and bandwidth. Ordinary checks can run for hours. A from-scratch Sprout scan downloads ~26 GB (1,046,400 full blocks from the start of the network to the Canopy upgrade), takes under 500 MB on disk, with progress saved along the way.
  • Argos 1.1.0+ (the point-and-click program or the command-line version). Old builds still correctly find and display money after Ironwood switched on, but the network rejects the transfer they assemble — confusing but harmless (nothing moves; just update).

Where to move: picking a wallet

For the procedure itself you need Argos (a recovery tool, not an everyday wallet), and for receiving the money — a modern Ironwood Ready wallet with a Unified Address. The full labeled list of wallets is in the catalog: zechub.wiki/wallets. Below are tried-and-tested options for different scenarios (ratings and platforms per the ZecHub catalog):

Wallet Rating Runs on Fits
Argos 0 Desktop computer No. 1 for recovery: reads old wallet.dat files, paper copies and Sprout keys, scans the network from its early years. Audited, free.
ZODL 79 Phone (iOS/Android) The default for receiving: simple, hands out a Unified Address right away.
Vizor 47 Computer and phone The all-rounder: stable, fully Ironwood-ready (transparent, Sapling, Ironwood).
Keystone 11 Separate device (hardware wallet) Maximum security: fits final storage of large sums after the move.
Zkool (Zkool2) 9 Phone and computer Simple and clear on both kinds of devices.
Noir wallet 2 Browser and computer For those who like working through a browser or a lightweight app.
Unstoppable 2 Phone Moving "on the go" from a smartphone only.

All receiving wallets above carry Ironwood Ready status. A Unified Address (starts with u1...) is a single address containing separate parts for the different pools: transparent, Sapling, and Ironwood. Programs pick the needed part themselves: Sprout money first arrives on the Sapling part, then the wallet moves it to Ironwood on its own.


5. Choose your path

Path Tool Fits when Difficulty
A — recommended Argos point-and-click program + wallet.dat You have the old wallet file (the most common case) Easy — guided steps
B Argos command line + SK... key No graphical screen, need scripts, key-only backup Medium — needs a terminal window
C zecd + your own Zebra node You already run your own node Hard — for experienced users
D (history only) Built-in zcashd move Doesn't work — stopped 18 July 2026

Compatibility reminder: only Argos and zecd understand Sprout. Don't attempt this through Ywallet or zcashd (neither is Ironwood-ready), and don't use a transparent-only wallet (Ledger, Trezor, Exodus, Trust Wallet, …) as the receiver — it cannot accept shielded money.


6.1 Download and verify (do not skip)

  1. Go to argos.sovright.comthis website is not a wallet: there is nowhere to enter secret words, and there never will be. Follow the download links to the Releases page on GitHub and grab the build for your system.

📸 Screenshot placeholder: sprout-guide-01-argos-download.png
What to capture: the Argos download section on argos.sovright.com with OS builds visible. Alt text: "Argos download page showing macOS, Windows and Linux builds".

  1. Verify the file is genuine — the only check that protects against a tampered file (every release ships with a build attestation — a GitHub-signed document proving the file was built from the official source code):
    gh attestation verify <downloaded-file> \  --repo sovright/argos \  --signer-workflow sovright/argos/.github/workflows/release.yml \  --source-ref refs/tags/<release-tag>
    The builds are also digitally signed (macOS: checked by Apple; Windows: signed via Azure on behalf of Iqlusion Inc). The SHA256SUMS file next to them catches accidental damage in downloading only, not tampering. Bookmark the correct website address — during migrations, scammers multiply lookalike sites.
  2. Argos passed an independent security review by Least Authority (report dated 29 June 2026 — all remarks fixed). Support: GitHub Discussions, the Signal group, support@sovright.com.

6.2 Prepare the receiver first

  1. Install ZODL or another wallet from the table above, write its new secret phrase down on paper, then tap Receive and copy the Unified Address (u1...).

📸 Screenshot placeholder: sprout-guide-02-zodl-receive.png
What to capture: the Receive screen in ZODL showing a Unified Address with copy button. Alt text: "ZODL wallet Receive screen with a Unified Address".

  1. Carry the address over to the recovery computer with no typos — e.g. via notes-to-self in Signal or synced notes. The receiving address is public, so this is a "copy without mistakes" step, not a secrecy one. Double-check the first and last 8 characters.

6.3 Set up a safe procedure

  • Large sums: take a fresh computer set up from a verified system installer. An ordinary factory reset does not clean possible firmware-level infection.
  • Smaller sums: during the procedure, run nothing but Argos and the system itself. No browser, no mail, no extra programs, no showing your screen to other people. Disk encrypted, system updated; don't put the computer to sleep while secrets are in memory.
  • Your secrets are never sent anywhere: public block data comes in, only the finished transfer goes out. Argos support will never ask for your secret words, file, password, or key. Anyone who asks is a scammer.

6.4 Open your recovery source

  1. Launch Argos and choose "I have a wallet file" — for wallet.dat. (The 24-word path does not cover Sprout.)
  2. Select or drag in the wallet.dat. Argos only reads it and changes nothing inside. If the file is encrypted — enter the password when asked (it lives only in memory and is never written to disk).

📸 Screenshot placeholder: sprout-guide-03-argos-welcome.png
What to capture: the Argos welcome screen with "I have a wallet file" selected and the file picker dialog. Alt text: "Argos welcome screen, wallet-file recovery selected".

  1. Look at the counters: how many transparent keys, Sapling keys, and Sprout keys were found, plus which records could not be read. If instead of a file you only have a standalone Sapling key — paste secret-extended-key-main1... keys (one per line); view-only keys won't do — they can't sign a transfer.

📸 Screenshot placeholder: sprout-guide-04-argos-key-counts.png
What to capture: the review screen with transparent/Sapling/Sprout key counts. Alt text: "Argos screen showing recovered key counts".

6.5 Configure and scan

  1. Choose mainnet, enter the wallet's approximate creation date (the earlier the date, the more thorough — but longer — the check), and verify the blockchain data server address (several comma-separated addresses are used as backups for each other). Leave account discovery on automatic unless you know the exact count.

📸 Screenshot placeholder: sprout-guide-05-argos-configure.png
What to capture: the configure screen — mainnet, creation date, server address, automatic discovery. Alt text: "Argos scan configuration screen".

  1. Start the scan. Argos downloads the lightweight block summaries and totals up the money on transparent addresses, in Sapling, and in Orchard. Sprout is shown and withdrawn separately — don't mistake the ordinary total for the whole wallet if Sprout keys are present.
  2. Progress is saved to the working folder — you can close the program and continue later from the same spot.

📸 Screenshot placeholder: sprout-guide-06-argos-scan.png
What to capture: scan progress with the Sprout section shown separately. Alt text: "Argos scan progress with Sprout shown separately".

6.6 The Sprout fork — two cases

  • Case 1 — the file already contains ready coin data and a saved proof of ownership. Then Argos immediately offers the "Sweep Sprout funds" button. No network scan needed. Treat the displayed balance as the file's claim until the network accepts the transfer.

📸 Screenshot placeholder: sprout-guide-07-argos-sprout-sweep.png
What to capture: the "Sweep Sprout funds" button/screen when ready data is present. Alt text: "Direct Sprout funds sweep button in Argos".

  • Case 2 — keys exist but no ready data. Then a full Sprout scan starts. The lightweight summaries don't contain the needed ciphertext, so Argos downloads full blocks from the network's earliest days to the Canopy upgrade and tries to decrypt every old Sprout record in them (a JoinSplit — an old-format data chunk holding encrypted coins): 1,046,400 blocks, about 26 GB of traffic, several hours of work, under 500 MB on disk. You may stop — resuming continues from the stopping point.
    • ⚠️ The in-progress save of such a scan is nearly the wallet itself (keys + decrypted coins + proofs). Guard it like the original. After a successful transfer Argos wipes it; delete leftovers only after the money is confirmed in the new wallet.

📸 Screenshot placeholder: sprout-guide-08-argos-sprout-scan.png
What to capture: full-block Sprout scan progress (percent, blocks, time estimate). Alt text: "Full Sprout block-scan progress in Argos".

6.7 Review and transfer

  1. Where to: Sprout money can only land in Sapling — enter a Sapling address (starting zs...) or a Unified Address (the program takes the Sapling part out of it on its own). You cannot jump from Sprout straight to Orchard/Ironwood in one hop: the old format (JoinSplit) and the new format (Orchard actions — the "actions" of the new pool) are incompatible with each other. The Sapling → Ironwood step is then done by the new wallet.
  2. Carefully check the screen: how much leaves in total, the network fee, how much arrives net, the transfer memo, skipped dust and accounts. Optionally set a maximum fee cap.
  3. The transfer screen carries an optional donation to the Sovright developers (10% by default, adjustable — set 0 to skip; recovery is free either way). Both recipients and the memo are shown before you confirm.
  4. Large sum? Run a tiny test first (e.g. 0.001 ZEC) all the way through to the end and make sure the money arrives and displays correctly. Only then move the rest.
  5. Pressing send cannot be undone. Confirm, then save the plain-text recovery report (where you moved, transaction IDs, what was skipped, where the working folder is). Never write secrets (phrases/passwords/keys) into it.

📸 Screenshot placeholder: sprout-guide-09-argos-sweep-review.png
What to capture: the transfer review screen — amounts, fee, memo, donation, receiving address. Alt text: "Transfer review screen in Argos".

6.8 Confirm the arrival

  • Transfers can sit "pending" if the server accepted them but they haven't landed in a block yet — check the transaction ID in the new wallet (after it catches up with the network) or in a block explorer.
  • Keep the original wallet.dat until every pool has moved and confirmed. Only then retire it (see §11).

📸 Screenshot placeholder: sprout-guide-10-argos-complete.png
What to capture: the completion screen with send results and the save-report button. Alt text: "Argos completion screen with recovery results".


7. Path B — Argos command line + standalone Sprout key

This path is for when you only have an SK... (mainnet) / ST... (testnet) key, have no graphical screen, or need scripts. The command-line program is called argos; verify the downloaded file the same way as in §6.1.

Typical command shape (the exact option set changes between versions — check your version's help):

# 1. Peek into the wallet file offline (counters, Sprout addresses,#    unreadable records) — the file is only read, nothing changes.argos inspect-wallet --wallet-file ./wallet.dat # 2a. If you have a wallet.dat with ready coin data — transfer directly.argos sweep-sprout --wallet-file ./wallet.dat --to <sapling-address-or-UA> ... # 2b. Key only: full scan first (26 GB, resumable), then transfer.argos scan-sprout --sprout-key-file ./sprout.key --data-dir ./argos-work ...argos sweep-sprout --to <sapling-address-or-UA> ...

Notes:

  • The --wallet-file option (wallet file) can't be combined with --seed-file (phrase recovery); --sapling-key-file takes standalone Sapling keys; --data-dir is the working folder for saves; server addresses are comma-separated backups.
  • A balance assembled only from saved wallet.dat records is the file's claim until the network accepts the transfer; a full-scan result is computed from the chain itself.
  • The file password is asked only interactively, never as a command option, so it doesn't show up in command history.
  • Transfers of imported Sapling keys are assembled in the PCZT format (Partially-Created Zcash Transaction — a transfer "draft" that is assembled and signed in parts) with the ordinary network fee, a memo, and a fee cap, and sent through the blockchain data server.
  • Exact options: argos --help, argos scan-sprout --help, and the README.

8. Path C — zecd + Zebra (for experienced users, in brief)

zecd is a wallet server (the second tool advertising Sprout support): it stores keys and scans blocks, but sees the chain itself only through your own Zebra node on the same home network (never open it to the internet).

The sketch: enable Zebra's command interface, install zecd (via the Rust language installer, ready-made archives/packages, or a Docker set), check the connection with chain-info, restore the wallet from a phrase with an approximate date via init --restore --birthday, start the background service — then ordinary commands (the get-address command returns a Unified Address).

This is a build-it-yourself path for node owners. Most people are better off with Argos (paths A/B): no node, no setup — everything needed is already inside.


9. Second step: Sapling → Ironwood (in the new wallet)

Your Argos transfer lands in Sapling. Finish the job inside the new wallet:

  1. Open the new wallet and let it fully catch up with the network. Ironwood-capable wallets find unmoved money themselves and usually show "migrating to Ironwood" or a progress bar; sometimes such money temporarily counts toward the "confirming" balance rather than "available".

📸 Screenshot placeholder: sprout-guide-11-ironwood-migrating.png
What to capture: the "migrating to Ironwood" indicator / move progress in the new wallet. Alt text: "Ironwood migration indicator in a mobile wallet".

  1. Keep the app open until the move finishes. Per document ZIP 318, the wallet follows a schedule deliberately stretched over hours or days. Progress only advances while the app is open and up to date.
  2. Don't send the whole balance meanwhile. Unmoved money can't be spent until it moves; spending mid-move produces confusing errors.
  3. Under the hood, each crossing is a new-format transaction through the "turnstile": the amount is visible to all in the transfer's dedicated fields (value-balance — the lines openly recording how much money crossed from pool to pool), while who paid whom stays hidden. The same logic as the old Sprout→Sapling "turnstile". Nothing is needed from you beyond patience.

Once done, new incoming transfers go straight to Ironwood (the old pools no longer accept other people's transfers), and the whole balance is spendable again.


10. Privacy: what everyone sees during the crossing (read before transferring)

What a "turnstile" is: a network rule by which money moves from a closed pool to the new one so that the amount is visible to all, while sender and receiver stay hidden. This lets anyone verify: no made-up money left the pool.

  • Visible to all: the moving amount (by network rules it passes through open accounting — you don't need to set up an open address for that).
  • Hidden: sender, receiver, individual coins.
  • The old zcashd tool (ZIP 308) hid each move in a crowd: transfers went in batches with random amounts every 500 blocks, and yours got lost among others'. Argos makes a direct transfer — assume the amount and timing are visible and can be linked to your operation. How to soften it: move to a fresh Unified Address under your control, wait for the Sapling → Ironwood step and only then spend, don't publish the transaction ID next to your name.
  • This openness of the amount is the point of the "turnstile": no more can leave than was honestly put in. That's how the claim "there is no extra money" becomes a fact anyone can check.

11. Security checklist

Do:

  • Download only from the official site and Releases page; verify genuineness (§6.1). Bookmark the website address.
  • Match carefulness to the sum (§6.3); check the receiving address character by character before transferring.
  • Set a maximum fee cap if you need a hard ceiling.
  • Keep the original wallet.dat until every pool has moved and confirmed.
  • Keep the recovery report with your notes (no secrets in it).
  • After the move, make a fresh backup of the new wallet (write the secret phrase on paper) — it is now your main backup.

After the transfer — retire the old secrets:

  • Any infection that touched the recovery computer may now know the phrase/password/key. The long-lived compromise is the secret, not the computer. Move to a fresh wallet, confirm, then write off the old backup and never use its addresses again.
  • If you ran the quick ZODL check from §3 — delete that test wallet: its only job was the check, otherwise the phrase now lives in a second place.
  • Sprout-scan in-progress saves: after a successful transfer Argos wipes them; delete leftovers only after confirmation in the new wallet. Safely delete old files from the working computer after the finale (you may keep one encrypted copy offline just in case, but stop using those addresses).

Never:

  • Never enter secret words and keys on any website — the Argos site only explains and lets you download.
  • Never show secrets to "support" in any chat — those are scammers.
  • Don't show a screen with secrets over video; don't wipe the wallet file before final confirmation; don't use Argos older than 1.1.0 (on today's network the transfer will fail).

12. If something went wrong

What happened What's going on and what to do
Scan finds money but the transfer fails Build older than 1.1.0 on today's network → update Argos to the latest and re-run. Nothing is lost (the rejected transfer had no effect).
Phrase is rejected Wrong phrase/typos → you need exactly 24 standard-dictionary words of the ZecWallet Lite phrase. (And remember: the phrase alone never covers Sprout.)
The check runs very slowly Creation date set too early → use the nearest date you're sure of; keep the working folder and continue. Full Sprout scans are inherently hours-long + ~26 GB.
Server won't connect Data-server problem → try the suggested default address, check mainnet is selected, or enter several comma-separated addresses.
Account "skipped" in the proposed transfer Too tiny an amount / hit the fee cap / not enough for the fee → read the skip reason; moving dust is sometimes uneconomical.
Sprout keys exist but no spendable coins The file has no ready coin data → keep the file and run the full Sprout scan; don't treat the ordinary total as complete.
New wallet shows money as "confirming" / won't let you spend Second step in progress → keep the wallet open and updated until the Ironwood move completes; don't force spending.
zcashd won't start / froze That's by design — the halt at block 3,417,100. Carry the wallet file over through Argos instead of trying to revive the program.

Still stuck? Ask in Argos discussions on GitHub (public — better for non-secret errors), the Signal support group, or support@sovright.comnever sending secrets.


13. FAQ

Is there a deadline?
No published date; the move is voluntary. But old pools are heading for shutdown (money then becomes unreachable), quantum-break protection exists only in Ironwood, and every year of waiting risks lost backups. The Sprout tail — ~25 thousand ZEC unmoved for ~8 years — shows what "later" usually means.

How much does it cost?
Just the network fee (pennies). Argos itself is free; the in-flow donation (10% by default) is optional and turns down to zero.

Can I do Sprout → Ironwood in one transfer?
No. The old format (JoinSplit) and the new one (Orchard actions) are incompatible, so Argos lands Sprout money in Sapling; then the new wallet moves Sapling → Ironwood on its own.

My ZEC is on an exchange. Does this concern me?
Nothing to do — exchange balances sit outside your shielded pools. Future withdrawals arrive transparent or (shielded) straight into Ironwood.

I have 24 ZecWallet Lite words and think there was Sprout money.
The phrase restores only transparent addresses, Sapling, and Orchard. For Sprout you need the original wallet file or a standalone SK... key. Without either, that money can't be recovered.

Why did "open accounting" flash by in my crossing?
By design: the amount passes through it for verifiability without creating an address you must manage. Who paid whom stays hidden.

Old instructions tell me to go through a t... address manually. Should I?
No. That's what people did before automatic tools existed: pushing Sprout → your own transparent address → Sapling, exposing the amount and risking a mistake on the extra step. Argos performs the crossing directly under the network rules: the amount honestly passes through open accounting, but no address setup or extra step is needed.

Which wallet should I pick for receiving, and where is the full list?
Start with the table in §4 (ZODL by default; Vizor, Keystone, Zkool, Noir, Unstoppable for scenarios). The full Ironwood Ready–labeled list is in the catalog at zechub.wiki/wallets.

Is this related to the NU7 vote (deadline 14 September 2026)?
No — that coin-holder vote on the next upgrade is separate project governance that merely shares the calendar.


14. Versions & references

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