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Privacy Policy

Last updated: March 24, 2026

1. Overview

Hashish is a decentralized Proof of Work mining protocol on Solana. Privacy is a core design principle of the protocol. This policy explains what data is collected, how it is used, and how your privacy is protected.

2. Website (hashish.fun)

This website does not:

  • Use cookies or tracking pixels
  • Collect personal information
  • Use analytics services (no Google Analytics, no Mixpanel)
  • Store any user data on our servers

The website fetches live blockchain data from Solana RPC nodes to display protocol statistics. These are read-only requests that do not involve any personal data.

3. Seeker Mobile App

The Hashish Seeker app collects the following data:

  • Device attestation data — Hardware TEE certificates are sent to our attestation backend to verify that you are mining from a genuine Solana Seeker device. This data is used solely for verification and is not shared with third parties.
  • Wallet public key — Your Solana wallet address is used to build and submit transactions. It is visible on-chain as part of normal Solana transaction processing.

The app does not collect:

  • Location data
  • Contact information
  • Browsing history
  • Personal identifiers beyond your wallet address

4. Attestation Backend

The attestation service verifies Android Key Attestation certificates to confirm device authenticity. It stores:

  • Wallet address (public key)
  • Attestation PDA address
  • Verification timestamp

No private keys, seed phrases, or personal information are ever transmitted to or stored by the backend. All stored data corresponds to publicly visible on-chain information.

5. Privacy Mining (Arcium MPC)

The Hashish Privacy program (PRVt5xukQMmY9NTt7SAXvqULWwuCTfxGj1GpgcRgish) uses Arcium Multi-Party Computation to protect miner identities. When using private mining:

  • Mining proofs are submitted through encrypted computation
  • Miner wallet addresses are not publicly visible in transactions
  • Rewards are distributed through privacy-preserving mechanisms
  • No single party (including the protocol team) can link miners to their submissions

6. On-Chain Data

All Solana transactions are public by design. When you mine using the standard pool, your wallet address, transaction signatures, and mining rewards are visible on the Solana blockchain. This is inherent to how public blockchains work and is not within our control.

For users who require transaction privacy, we recommend using the Privacy Mining feature powered by Arcium MPC.

7. Third-Party Services

The protocol interacts with the following third-party services:

  • Solana RPC nodes — For submitting and reading blockchain data
  • Arcium MPC network — For privacy-preserving computations
  • Meteora DAMM v2 — For decentralized liquidity management

Each of these services has its own privacy policy. We encourage users to review them independently.

8. Data Retention

The attestation backend retains device verification records for operational purposes. On-chain data is immutable and permanent by the nature of blockchain technology. No off-chain personal data is retained beyond what is described in this policy.

9. Contact

For privacy-related inquiries, please reach out via Twitter (@hashishdotfun) or open an issue on GitHub.