# Cloak

> Privacy SOL Transfers on Solana

Cloak enables users to send SOL privately on Solana using zero-knowledge proofs and shared privacy pools to break transaction links.

Cloak facilitates private SOL transfers on Solana through a privacy-preserving protocol utilizing zero-knowledge proofs and Merkle tree commitments. Users deposit SOL into a shared privacy pool, then withdraw to fresh addresses with cryptographically guaranteed unlinkability between deposits and withdrawals. The system verifies SP1 Groth16 proofs on-chain while implementing optional proof-of-work claims for prioritized withdrawals during network congestion.

- Type: Project
- Sector: Privacy & Confidentiality
- Status: Announced
- Founded: 2025-09-01
- Profile: https://thegrid.id/profiles/cloak

## Products

- [Cloak Privacy Pool](https://thegrid.id/profiles/cloak): Cloak Privacy Pool provides privacy-preserving exit routing on Solana through zero-knowledge proof verification and UTXO-style commitment architecture. The protocol operates a shared pool where users deposit SOL to generate cryptographic commitments recorded in an append-only Merkle tree, then withdraw to unlinked addresses through SP1 Groth16 proofs verified on-chain. The system maintains an indexer service for Merkle proof generation, relay infrastructure for transaction submission, and optional proof-of-work prioritization mechanisms enabling users to earn fees by mining wildcard claims during network congestion. Developer integration utilizes a TypeScript SDK providing unified methods for deposit flows, proof generation, and multi-recipient withdrawals. (Privacy Pool, In Development, Main Product)

## Links

- [Main](https://www.cloaklabz.xyz)
- [Documentation](https://github.com/Machine-Labz/cloak)
- [Twitter / X](https://x.com/cloaklabz)
- [GitHub](https://github.com/Machine-Labz)

## Legal

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Model 2 - commercial licenses. The Grid Data Service (TGDS) is also available as a commercial license. See [Web Services Terms](https://about.thegrid.id/legal/web-services-terms) for commercial use that is not covered by the open data service.

The following applies to both licensing models.
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- [Data Licensing & Disclaimers](https://about.thegrid.id/legal/data-licensing-and-disclaimers): Licensing models and disclaimers
- [Open Data (ODbL)](https://about.thegrid.id/legal/open-data): Open Database License terms and scope for The Grid's open data service.
- [Attribution Guidelines](https://about.thegrid.id/legal/open-data-attribution-guidelines): How to attribute The Grid's data when using the open data service.
- [Web Services Terms](https://about.thegrid.id/legal/web-services-terms): commercial Terms for using data services.
- [All Legal Documents](https://about.thegrid.id/legal): Full index of terms, policies, and disclosures

## Optional

- [TGS Field Descriptions](https://github.com/The-Grid-Data/workspace-public/blob/main/references/tgs-field-descriptions.md): Schema field definitions for The Grid's data model
- [TGS JSON Structure](https://github.com/The-Grid-Data/workspace-public/blob/main/references/tgs-json-structure.md): Data model structure and relationships
- [Product Type Definitions](https://github.com/The-Grid-Data/workspace-public/blob/main/references/product-type-definitions.md): Definitions for each product type
- [Product Type Classification](https://github.com/The-Grid-Data/workspace-public/blob/main/references/product-type-classification.md): Guide for classifying products into types
- [Grid MCP Guide](https://github.com/The-Grid-Data/workspace-public/blob/main/grid-search/skills/grid-query/references/grid-mcp-guide.md): How to query The Grid programmatically via MCP