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What is Umbra?

Umbra adds a privacy layer on top of standard Solana SPL and Token-2022 tokens. It lets you:
  • Shield balances - move tokens from a public SPL or Token-2022 account into an encrypted account where the balance is hidden from everyone except authorized viewers
  • Transfer anonymously - move tokens in and out of a shared mixer pool with no on-chain linkage revealed between the entry and exit points
  • Control who sees what - grant selective viewing access to auditors or compliance systems without exposing your full history
Everything runs on Solana mainnet using a combination of on-chain programs and Arcium multi-party computation (MPC) for the confidential arithmetic.
You do not need to understand MPC or zero-knowledge proofs to use Umbra. The SDK handles all cryptographic operations for you.

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Core Concepts at a Glance

Encrypted Balances

Shield any SPL or Token-2022 token balance in a confidential account. Only you - and anyone you explicitly grant access to - can see the amount.

Mixer / UTXOs

Break the on-chain link between a deposit and a withdrawal using a shared Merkle tree and zero-knowledge proofs.

SDK

A TypeScript SDK that wraps all protocol operations into simple async functions. Works in Node.js and browser environments.

Indexer API

A read-only REST API for querying UTXO records and Merkle proofs - used internally by the SDK and available for direct integration.

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How It Fits Into Your Stack

Umbra is designed to slot into an existing Solana application. You bring your wallet adapter; Umbra handles the rest. 
Your App
  └── Wallet (Phantom, Solflare, etc.)
        └── Umbra SDK (@umbra-privacy/sdk)
              ├── Solana RPC    - sends and confirms transactions
              ├── Arcium MPC    - performs confidential computation off-chain
              └── Umbra Indexer - indexes UTXOs and generates Merkle proofs

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Program ID

The Umbra on-chain program is deployed at: 
UMBRAkrfUTHuPAjDQXgmpoQjGGyhtqiRqWNrMroEijV
This address is the same on mainnet, devnet, and localnet test deployments.

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Supported Networks

  • mainnet - Production
  • devnet - Development and integration testing
  • localnet - Local validator for unit tests

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Next Steps

Quickstart

Install the SDK and run your first deposit in under 5 minutes.

How Umbra Works

Understand the privacy model before you start building.