> ## Documentation Index
> Fetch the complete documentation index at: https://docs.cloak.ag/llms.txt
> Use this file to discover all available pages before exploring further.

# Platform Overview

> How Cloak fits together across SDK, programs, and circuits

Cloak is a privacy stack on Solana built around a shielded UTXO model and zero-knowledge proofs.

This page is the developer entry point. If you're here as a user rather than an integrator, start with [What is Cloak?](/guide/what-is-cloak) in the Guide tab.

It has three public surfaces:

* SDK (`@cloak.dev/sdk`) for proof generation, tx building, and scanning
* Shield Pool program for on-chain verification and state transitions
* Circuit package for Groth16 artifact generation and verifier-key export

## Use cases

## Private Treasury Flows

Run deposits, transfers, withdrawals, and swaps with shielded state transitions while keeping verifiable protocol guarantees on-chain.

Designed for: treasury teams, privacy-focused wallets, protocol operators

## Compliance-Aware Privacy Apps

Build products that keep user transaction details private by default, while still supporting controlled compliance export paths via registered viewing keys.

Designed for: regulated apps, custody workflows, institutional operators

## What Cloak optimizes for

* Privacy-preserving transfers and withdrawals with deterministic verification
* Cross-surface consistency across SDK, program, and circuit layers
* Operational reliability through retries, queueing, and root/index recovery
* Compliance-friendly history scanning via viewing keys and chain-note envelopes

## Capabilities

* **Shielded UTXO Runtime**: 2-in/2-out proof-constrained transactions with nullifier-based spend protection.
* **Chain-Native Compliance**: encrypted chain notes, viewing-key registration, and controlled compliance workflows.
* **Operational Tooling**: circuits build/publish pipeline for verifier artifact consistency.

## Integration starting points

<CardGroup cols={2}>
  <Card title="Build with SDK" icon="code" href="/sdk/introduction">
    Use TypeScript APIs for deposit, transfer, withdraw, swap, and scanning.
  </Card>

  <Card title="Read Code Examples" icon="code-branch" href="/sdk/examples">
    Use concise snippets for send, swap, payroll, and history.
  </Card>

  <Card title="Understand Runtime Flows" icon="diagram-project" href="/platform/transaction-flows">
    Follow end-to-end behavior from client request to on-chain finalization.
  </Card>

  <Card title="Review Program Rules" icon="microchip" href="/protocol/shield-pool">
    See instruction-level constraints, account model, and fee enforcement.
  </Card>

  <Card title="Security Model" icon="shield-check" href="/operations/security">
    Review trust boundaries, key handling, and failure containment.
  </Card>
</CardGroup>