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STRK20 gives a Starknet wallet selective privacy, not blanket anonymity. When you shield a supported ERC-20, its balance becomes an encrypted note in a privacy pool. Zero-knowledge proofs let Starknet verify ownership, prevent double spending and check value conservation without publishing the sender, recipient, amount or token type for transfers inside the pool. The public deposit and withdrawal legs, timing, protocol metadata and much of the activity performed through public DeFi contracts remain visible.
That distinction matters when you swap, lend, borrow or stake. STRK20 can reduce the direct link between your everyday wallet and a DeFi action, but it cannot make a public lending position, a liquidity transaction or a withdrawal disappear.
What Starknet wallet privacy actually protects
A normal Starknet wallet uses transparent account and token contracts. Observers can follow addresses, balances, transfers and contract calls onchain. STRK20 adds a shielded state for supported ERC-20 assets on the same network. You can move an asset from its public state into the privacy pool, transact privately within that pool, and later return it to a public address.
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| Method | What observers cannot directly see | What remains public | Best understood as |
|---|---|---|---|
| Regular Starknet wallet | Nothing about the account’s onchain activity is shielded by default. | Address, balances, transfers, contract calls, timing and positions. | Transparent DeFi identity and state. |
| STRK20 shielded balance | For an in-pool transfer: sender, recipient, amount, token type and spent notes. | Deposit and withdrawal addresses and amounts, timing, encrypted notes, nullifiers and required protocol metadata. | Confidential pool transfer. |
| Anonymizer contract | The direct public link from your ordinary wallet to the DeFi action can be broken. | The public liquidity leg and app-side amounts or actions can remain visible. | Unlinkability with existing DeFi liquidity. |
| Shadow account | The public onchain link to your main wallet. | The shadow address, balances, calls and positions. | Per-dapp identity separation, not hidden state. |
How STRK20 works from deposit to withdrawal
STRK20 is note-based rather than a fixed-denomination mixer. Each shielded balance is represented by encrypted notes. A zero-knowledge STARK proof lets Starknet check the validity of a private transaction without revealing the private inputs.
- Deposit: You send a supported ERC-20 from a public address to the STRK20 pool. The public transaction records the address, token and amount. The pool creates an encrypted note representing the shielded value.
- Private transfer: Your wallet selects existing notes and creates new encrypted notes for the recipient or for yourself. The proof demonstrates that the notes exist, belong to the spender, have not been spent before and balance in value. Starknet verifies the proof before updating pool state.
- Optional DeFi action: A supported wallet or anonymizer flow can use a shielded note as input to a swap, lending or other application. The exact visibility depends on whether the app-side leg executes through public contracts.
- Withdrawal: You redeem a note to a public ERC-20 address. The withdrawal amount, destination and timing are visible onchain, restoring the token’s ordinary transparent behavior.
Shielding is therefore a state change, not a new chain or a separate version of the token. The same ERC-20 can move between public and shielded states, and unshielding returns it to transparent use.
What a private transfer hides—and what it leaves behind
Hidden inside the pool
- The sender and recipient identities associated with an in-pool transfer.
- The transferred amount.
- The token type involved in that private transfer.
- The specific notes being spent.
These details are represented in encrypted notes and proved without exposing their contents to public observers. A blockchain viewer can see that the pool was used, but not reconstruct the complete private payment from the transfer record alone.
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- Public deposit and withdrawal addresses, amounts and timing.
- Encrypted notes, nullifiers and other protocol metadata required to verify and prevent replay or double spending.
- When a wallet interacts with the pool and the broad timing pattern of those interactions.
A nullifier is not the original note or its value; it is a public marker that lets the protocol reject a note being spent twice. Its presence, along with timing and entry or exit data, can still support analysis of activity around the pool.
How privacy changes a Starknet swap
An anonymizer flow can take a shielded input note, unshield it into a contract, route the swap through existing Starknet liquidity and redeposit the output as a new private note in one atomic operation. Starknet’s launch example describes routing through avnu and using Ekubo as a liquidity venue; availability is phase-dependent and a wallet or dapp should confirm current support.
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The privacy gain is the broken direct link between your ordinary wallet and the swap. Someone inspecting your main address should not automatically see that it initiated the private swap. The trade itself is not invisible: amounts that travel through public liquidity, the route, pool interaction and app-side execution can remain visible. A large or unusual trade may therefore reveal strategy even when the wallet-to-action link is obscured.
In practice, this is useful when you want to keep a long-term wallet from becoming a public trading diary. It is not a way to hide market impact, liquidity usage or every amount involved in the transaction.
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The early Vesu flow illustrates the limitation clearly. The wallet unshields collateral, supplies it to the public lending market, borrows USDC, then shields the borrowed asset. The borrowed USDC can become a private balance after the shield step, but the collateral remains visible while it is locked in the public lending protocol.
Observers can therefore identify the public collateral transaction, the lending market and the timing of the supply. They may not be able to connect the resulting shielded USDC to a particular recipient inside the pool without additional information. If you later withdraw the borrowed asset, that exit creates another public leg.
Privacy is strongest for the movement between notes and weakest where the application requires a transparent collateral or liquidity position. A lending strategy that depends on public collateral ratios, liquidation calls or visible account health cannot be fully concealed by shielding only the borrowed token.
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Staking and liquid-staking assets
For staking, the normal staking operation happens first. Assets such as Endur’s xSTRK and xstrkBTC can then be shielded as supported ERC-20 positions. The shielded balance can reduce the public connection between the staking result and later transfers, but the original staking transaction remains public.
Wallet and application integration is being phased in, so the available sequence may differ by asset and interface. Check that the wallet recognizes the specific token and supports the required shield, private-transfer and withdrawal operations before moving funds. Shielding a liquid-staking token does not hide the protocol’s public staking event, validator-related metadata or any later action that requires a transparent contract call.
Shadow accounts: separate identity, public activity
A shadow account uses a persistent deterministic address for a particular dapp and nonce. The address has no public onchain link to your main wallet, which can prevent a casual observer from grouping every application under one identity.
The separation stops at the account boundary. The shadow account’s balance, contract calls, transfers and DeFi positions are public. Anyone can study that account’s strategy; they simply cannot prove from the address alone that it belongs to your primary wallet. Funding patterns, withdrawal behavior or information disclosed outside the chain can still create a link.
Use a shadow account when the main goal is compartmentalization between applications. Use STRK20 when the goal is to keep transfer details inside the privacy pool. They address different privacy problems and can be combined only where the wallet and application support both.
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Using a wallet that supports STRK20
The June 2026 launch material names Ready X and Xverse as first-phase wallet interfaces. Support is capability-dependent: one wallet or dapp may offer shielding and private transfers while another also supports private swaps, shadow accounts or withdrawals.
- Verify capabilities: Confirm that the wallet supports the token you intend to use and exposes the required shield, private-transfer, withdrawal or DeFi operation. A dapp should detect the wallet’s capabilities rather than assume every operation exists.
- Prepare public funds: Keep enough of the public token for the deposit and enough STRK for network and privacy-operation fees. The launch article states a fee of 4 STRK per private transaction; treat that as a volatile 2026 launch parameter and verify the current value in the wallet before signing.
- Shield deliberately: Review the public deposit address, token and amount. Remember that this entry transaction is visible even though the resulting balance is shielded.
- Back up privacy credentials: The wallet manages keys, notes and proving data. Preserve any viewing-key or note-recovery information the wallet provides; losing it can affect your ability to interpret or disclose shielded activity.
- Choose the right DeFi route: Use a supported anonymizer for a private swap or another integrated flow for lending and staking. Read which leg will be public before approving an atomic transaction.
- Withdraw only when needed: Unshielding restores ordinary ERC-20 transparency. Check the destination address and amount because both become public at the exit.
The Wallet API exposes shield, private-transfer, withdraw and shadow-account operations, plus swap operations where supported. Developers building broader private DeFi generally pair the API with an application-specific anonymizer contract; wallet support alone does not make an arbitrary dapp private.
Why the anonymity set matters
Pool privacy depends partly on how many users are shielding and transacting in comparable ways. If only a small group uses the pool, deposit and withdrawal timing, token amounts and external behavior can narrow the likely sender or recipient. More participants and more varied activity increase the anonymity set and make individual inference harder.
This is a statistical privacy property, not a guarantee. Avoid moving a uniquely sized amount immediately after a distinctive public event if your goal is to reduce linkability. Keep in mind that activity outside Starknet, exchange records, counterparties and voluntarily shared information can provide context the zero-knowledge proof does not erase.
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Selective disclosure and authorised audits
STRK20 is not designed to make information inaccessible to every party forever. Viewing keys support scoped, user-specific disclosure. You can provide an authorised auditor or other approved party with evidence about selected shielded activity without publishing the entire wallet history to everyone.
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That creates a practical middle ground: ordinary observers do not see the private transfer details, while a user can satisfy an audit or compliance request when required. The scope and security of the disclosure depend on how the viewing key is issued, stored and shared. Treat it as sensitive access, not as a public address.
Choosing the right privacy pattern
| Question | Regular wallet | Shielded balance | Anonymizer | Shadow account |
|---|---|---|---|---|
| Hide the main-wallet link? | No. | For in-pool transfers, generally yes; public entry and exit can reconnect activity. | Yes, for the direct wallet-to-action link, subject to correlation. | Yes, by using a separate deterministic address. |
| Hide amount and token inside the transfer? | No. | Yes for the private pool leg. | Only for the shielded legs; public liquidity amounts may show. | No; the shadow account’s state is public. |
| Hide a DeFi position? | No. | Only if the position is represented by shielded notes and the app supports that design. | No for public app-side positions and calls. | No; positions at the shadow address are visible. |
| Use existing public liquidity? | Yes. | Not by itself. | Yes, through the anonymizer’s public contract leg. | Yes, from the separate public address. |
| Disclosure control? | Public by default. | Selective disclosure through viewing keys is supported. | Depends on the underlying shielded notes and contract flow. | Public account history, despite unlinkability. |
Questions to answer before signing
- Which exact transaction is public: the deposit, the DeFi call, the withdrawal, or all three?
- Does the dapp support the wallet operation you need, or only ordinary public calls?
- Will collateral, pool input, borrowed asset or staking receipt remain in a public contract?
- What viewing-key or note-backup procedure will let you recover and selectively disclose activity?
- Is the current anonymity set large enough for your timing and amount pattern?
- What fee is shown now? The 4 STRK figure is a launch-era parameter, not a permanent guarantee.
The practical verdict is straightforward: STRK20 can conceal the details of transfers inside its pool and can reduce the direct identity link around supported DeFi flows. It cannot hide public deposits and withdrawals, public liquidity execution, shadow-account state, protocol metadata or information you later disclose.
Frequently Asked Questions
Does shielding create a new version of my ERC-20?
No. STRK20 moves the asset between public and shielded states on Starknet. Unshielding returns the asset to ordinary transparent ERC-20 behavior.
Can a viewing key make my entire wallet private?
No. Viewing keys provide scoped disclosure of selected shielded activity. Public deposits, withdrawals and public DeFi calls remain visible onchain.
Is the 4 STRK private-transaction fee permanent?
No. It is the fixed fee stated in the 2026 launch material and should be treated as a changeable launch parameter. Check the wallet’s current quote before signing.
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