# Opaque Protocol

> Stealth payments, provable reputation, and cross-chain announcements.

## Docs

- [Cross-chain announcements](https://docs.opaque.cash/concepts/cross-chain.md): Universal Announcement Bus (UAB) over Wormhole for multichain stealth inboxes.
- [Provable reputation (PSR)](https://docs.opaque.cash/concepts/psr.md): Privacy-preserving attestations bound to stealth identities and Groth16 verification.
- [Stealth payments](https://docs.opaque.cash/concepts/stealth-payments.md): EIP-5564 meta-addresses, DKSAP, announcements, and the receive flow.
- [Create a PSR schema](https://docs.opaque.cash/guides/create-schema.md): Register a schema on Ethereum or Solana and manage delegates.
- [Enterprise disclosure (threshold viewing keys)](https://docs.opaque.cash/guides/enterprise-disclosure.md): Selective M-of-N disclosure for KYC providers, DAO treasuries, and audit firms — without exposing the full viewing key.
- [Generate a reputation proof](https://docs.opaque.cash/guides/generate-proof.md): End-to-end flow from discovered traits to on-chain verification.
- [Issue an attestation](https://docs.opaque.cash/guides/issue-attestation.md): End-to-end issuer flow, from attesting to a stealth identity to announcing for discovery.
- [Name a meta-address (ONS)](https://docs.opaque.cash/guides/ons-naming.md): Give a stealth meta-address a human-readable name that resolves on both Ethereum and Solana.
- [Amount privacy (privacy pool)](https://docs.opaque.cash/guides/privacy-pool.md): Deposit and withdraw through the Opaque privacy pool with association-set compliance.
- [Register and receive](https://docs.opaque.cash/guides/register-and-receive.md): End-to-end flow to register your meta-address and receive stealth payments.
- [Scan and sweep](https://docs.opaque.cash/guides/scan-and-sweep.md): Discover owned stealth outputs across chains and move native or token balances.
- [Send a stealth payment](https://docs.opaque.cash/guides/send-stealth-payment.md): End-to-end flow to pay someone privately on Ethereum or Solana.
- [Server-side scanning](https://docs.opaque.cash/guides/server-side-scanning.md): Run scanning on a server with a view-only client that can detect payments but never spend.
- [Opaque Protocol](https://docs.opaque.cash/index.md): Stealth payments, provable reputation, and cross-chain announcements in one TypeScript SDK.
- [Testnet deployments](https://docs.opaque.cash/protocol/deployments.md): The generated @opaquecash/deployments registry and the bundled addresses.
- [Protocol overview](https://docs.opaque.cash/protocol/overview.md): CSAP, PSR, and UAB specifications and how they fit together.
- [Quickstart](https://docs.opaque.cash/quickstart.md): Install @opaquecash/opaque, derive stealth keys, and run a minimal send/receive flow.
- [Cross-chain API](https://docs.opaque.cash/sdk/cross-chain-api.md): UAB methods for relaying and scanning cross-chain stealth announcements.
- [Installation](https://docs.opaque.cash/sdk/installation.md): Install @opaquecash/opaque, configure WASM, and choose the right signers per operation.
- [OpaqueClient overview](https://docs.opaque.cash/sdk/opaque-client.md): Construction, configuration, and method index for the unified SDK client.
- [PSR API](https://docs.opaque.cash/sdk/psr-api.md): OpaqueClient methods for schema registry and attestation lifecycle.
- [React hooks](https://docs.opaque.cash/sdk/react.md): @opaquecash/react: OpaqueProvider, useOpaqueClient, useScan, and useStealthBalance.
- [Relayer client](https://docs.opaque.cash/sdk/relayer-client.md): Submit an on-chain action through the gas-private relayer market without linking your gas wallet.
- [Reputation API](https://docs.opaque.cash/sdk/reputation-api.md): Trait discovery, Groth16 proofs, and on-chain verification.
- [Stealth API](https://docs.opaque.cash/sdk/stealth-api.md): OpaqueClient methods for meta-addresses, recipient resolution, stealth sends, scanning, sweeping, and anonymity utilities.
- [Utilities and exports](https://docs.opaque.cash/sdk/utilities.md): Helper functions, types, and lower-level packages re-exported from @opaquecash/opaque.

## Optional

- [Protocol spec](https://github.com/opaquecash/spec)
- [App](https://www.opaque.cash)