Privacy Policy — SigmaTracker

Last updated: September 18, 2026

SigmaTracker (the "App", "we", "us") is an iOS app that lets you watch public cryptocurrency wallet balances across multiple blockchains from one place. SigmaTracker is not a wallet. It cannot hold funds, generate or import private keys or seed phrases, or sign or send anything. It only reads publicly-visible balance information for addresses you choose to add, shows you those balances and how they change over time, and can notify you locally when one changes.

SigmaTracker is an independent project developed and maintained by an individual. There is currently no associated legal entity or company.

1. What SigmaTracker Is (and Is Not)

• Not a wallet. No private keys, no seed phrases, no signing, no ability to move, receive, or approve funds of any kind. There is nothing in the App that can authorize a transaction.
• A read-only balance tracker. You add public wallet addresses for the networks the App supports — currently Ethereum, Bitcoin, and Solana, with additional EVM-compatible networks planned — and the App periodically checks the public balance of each address and shows you the change over time.
• Local notifications only. When a watched balance changes, the App can show you a notification generated entirely on your device. Nothing is pushed to your device from a server we operate, because we operate none. Background checks run on iOS's own background-refresh scheduler, which iOS may skip at its own discretion — a notification is best-effort, never guaranteed.

2. No Account, No Backend of Ours

• SigmaTracker has no sign-up, no login, and no user account of any kind.
• We do not operate a backend server. There is no server of ours in the loop between the App and the blockchain data it displays.
• The addresses you add, and the balance history the App keeps for them, are stored only on your device (using Apple's SwiftData framework) and are never transmitted to any server we operate.
• Uninstalling the App removes this locally stored data.

3. Third-Party Services — What They See (read this section)

To show you a balance, SigmaTracker sends the public address you added to a third-party public block explorer or public blockchain RPC endpoint, exactly as any block-explorer website would if you looked up that address yourself in a browser. This is the most important disclosure in this policy: those third parties necessarily see the address being queried and your device's IP address, because that is how any network request works. We do not control what those third parties do with that information — each operates under its own, separate privacy policy, which we encourage you to review.

The services SigmaTracker currently queries are:

• Ethereum — Blockscout (a public, third-party block-explorer API) and publicnode.com's public Ethereum RPC endpoint.
• Bitcoin — mempool.space and, as a fallback, Blockstream's public Esplora API.
• Solana — Solana's public mainnet RPC endpoint, operated by the Solana Foundation.
• Other EVM-compatible networks, as support for them is added, are queried through the equivalent public block explorer or public RPC endpoint for that network.
• Prices — current price data is fetched from CoinGecko's public API to show fiat-equivalent values. No personal data or wallet address is included in those price requests; they ask only for the price of a coin, never for anything tied to you or your addresses.

None of these providers is affiliated with us, and none of them receives anything from you beyond a public address (for balance lookups) or a coin identifier (for price lookups) and, inherently, your IP address at the network layer. We do not operate our own servers, so we never see or log this traffic ourselves.

Because balances are read directly from public sources, any data these third parties return, and any data recorded on the underlying public blockchain itself, is inherently public and outside our control.

4. No Analytics, No Advertising, No Tracking

SigmaTracker contains no analytics SDK, no advertising SDK, and no tracking or profiling technology of any kind. It has no third-party software dependencies at all — it is built entirely on Apple's own frameworks, so there is no third-party code inside the App that could collect data on its own behalf.

5. Data You Provide Directly

The only information you give the App is the public wallet addresses you choose to add for tracking, and any display names or preferences you set locally. Public wallet addresses are, by design, public — anyone can already look up the balance of an address you add, with or without SigmaTracker. The App does not ask for your name, email address, phone number, or any other personal identifier, and does not require any of them to function.

6. Children

SigmaTracker is not directed to, and is not intended for use by, children. We do not knowingly collect any information from children.

7. Changes to This Policy

We may update this Privacy Policy when necessary — for example, when adding support for additional networks or price sources, or when a third-party provider changes its practices. The date at the top of this document indicates the last revision.

8. Contact

For questions, feedback, or privacy-related inquiries, use the feedback form at sigma9.app/feedback/tracker.

We do not maintain a public support email to reduce spam. Please use the form above.

This Privacy Policy is the authoritative version for the SigmaTracker iOS app.

It is published at a stable public URL — https://sigma9.app/privacy-policy/tracker — and is referenced from the Apple App Store listing and inside the App. Separate privacy policies cover the Sigma9 browser extension (https://sigma9.app/privacy-policy/extension) and any future Sigma9 wallet mobile app; this document applies only to SigmaTracker.

SigmaTracker — watch your public balances. Nothing to sign, nothing to lose.