Legal

Terms of Service

These terms cover your use of the Hollow website, the Hollow app and the Hollow relayer. Please read them, and the risks in particular, before you move any money.

Last updated October 19, 2026

1. Agreement

By using usehollow.xyz, app.usehollow.xyz or the Hollow relayer (together, the "Services"), you agree to these terms. If you don't agree, don't use the Services. "Hollow", "we" and "us" mean the team that operates the Services.

2. What Hollow is

Hollow is software. The website and app are an interface to the Hollow program, which runs on the Solana blockchain. Deposits and withdrawals are transactions you sign with your own wallet, or proofs you hand to a relayer, and they are carried out by that program and the Solana network.

  • We never hold your money. Funds sit in on-chain pool accounts that only a valid zero-knowledge proof can release.
  • We never see your notes. Notes, proofs and your vault are created in your browser. Nothing secret is sent to us.
  • Transactions are final. Once confirmed on Solana, nobody, including us, can reverse, cancel or refund them.

3. Risks

By using Hollow you accept these risks:

  • Privacy has limits. Hollow removes the on-chain link between a deposit and a withdrawal, but timing, amounts, a small number of other deposits, address reuse and your own behavior can still reveal you. See Staying private.
  • Network and services. Solana, RPC providers, wallets and the relayer can be slow, congested or unavailable.

Only deposit what you can afford to lose.

4. Your notes are your money

Each deposit produces a note. Whoever holds the note can withdraw the deposit. You are solely responsible for saving your notes, send links, vault passphrase and vault backups, and for keeping them private. If you lose a note, or someone else gets it, we cannot recover the funds or stop a withdrawal.

5. The relayer and fees

The relayer is an optional service that submits your withdrawal so your wallet doesn't appear on-chain. It charges a fee, taken from the amount withdrawn and shown before you confirm. The relayer only receives the finished proof, which can only pay the address and fee sealed inside it.

The relayer may be unavailable, slow to start or unable to send a withdrawal, and a scheduled withdrawal may not go out. If that happens your funds stay in the pool and your note still works: you can withdraw again, with the relayer or from your own wallet. Shielding costs only the Solana network fee. Fees may change; the app always shows the current fee before you withdraw.

6. Who may use Hollow

You may use the Services only if:

  • you are old enough to enter into a binding contract where you live;
  • you are not a person or entity named on, or owned or controlled by anyone named on, a sanctions list maintained by the United States, the United Kingdom, the European Union or the United Nations;
  • you are not located in, or ordinarily resident in, a country or region subject to comprehensive sanctions by any of them; and
  • using Hollow is lawful for you where you are.

7. What you may not do

Hollow is built for ordinary financial privacy. You may not use the Services to:

  • move or hide proceeds of crime, launder money or finance terrorism;
  • evade sanctions, taxes or any other legal obligation;
  • commit fraud, extortion or ransomware, or receive money from them;
  • break any law that applies to you; or
  • attack, overload, probe or interfere with the Services, the program or other users.

We may refuse, limit or block access to the website, the app or the relayer, for any address or region, at any time, including where we believe these terms are being broken. The on-chain program itself is not something we can turn off for anyone.

8. Laws and taxes

You are responsible for complying with the laws that apply to you and for any taxes on your transactions. Nothing on the Services is legal, tax, financial or investment advice.

9. Other services

Using Hollow involves services we don't control, including your wallet, the Solana network, RPC providers, block explorers and hosting providers. They have their own terms and we are not responsible for them.

10. Our content

The Hollow name, logo, hood mascot and site content belong to us. You may not use them in a way that suggests you are Hollow or that we endorse you.

11. No warranties

The Services are provided "as is" and "as available", without warranties of any kind, express or implied, including merchantability, fitness for a particular purpose, non-infringement, accuracy and uninterrupted or error-free operation, to the fullest extent the law allows.

12. Limits on our liability

To the fullest extent the law allows, Hollow and the people behind it are not liable for any indirect, incidental, special, consequential or punitive damages, or for any loss of funds, profits, data or privacy, arising from your use of the Services, including losses caused by bugs, upgrades, network failures, lost notes or a relayer that fails to send. Where liability can't be excluded, our total liability is limited to the relayer fees you paid us in the twelve months before the claim.

13. Indemnity

You agree to cover any claims, losses and costs (including reasonable legal fees) brought against us because you broke these terms or the law while using the Services.

14. Changes and ending

We may change these terms. The date at the top shows the latest version, and continuing to use the Services means you accept it. We may change, suspend or stop the website, app or relayer at any time. If Hollow ever shuts down, we will announce it in advance so people can withdraw; your notes keep working with the on-chain program for as long as it runs.

15. Contact

Questions about these terms: contact@usehollow.xyz.