Shielded pool for private balances, private transfers to registered users and unlinked withdrawals; mainly on Solana.

Official links: Website (umbraprivacy.com) · App (v2.umbraprivacy.com) · @UmbraPrivacy (x.com) · Docs (docs.nimbusprivacy.xyz) · Stats (stats.umbraprivacy.com) · Governance (metadao.fi) · DefiLlama (defillama.com)

What Umbra does

• Deposit ETH, WETH or other allowed tokens into a private balance
• Send privately to registered recipients; amounts stay hidden
• Withdraw to a different address, submitted through a relayer
• Selective disclosure of your own activity by time, token or address
• Screening of public addresses as funds enter or leave the pool

Each deposit, private transfer and withdrawal can carry a protocol fee in basis points, set by governance and capped at 5% by the program, plus a public tip to the relayer that submits it.

Umbra, built mainly on Solana, runs its V2 protocol (Nimbus) on Robinhood Chain as a single shielded pool contract that holds every allowed asset, with ETH and WETH sharing one private balance backed by native ETH. Deposits become private notes; a later transaction proves ownership with a zero-knowledge proof, so private transfers to registered recipients and withdrawals to another address are not linked on chain to the deposit, while getting tokens in and out stays public. Addresses are screened at the edge of the pool and users can grant selective disclosure. The pool went live on 22 October 2026 and on 3 November held about $1,350, almost all ETH, from 44 depositors. External audits by Accretion and zkSecurity were under way as of late October.

• On Robinhood Chain since: 2026-10
• Founded: 2025
• Team: Raised through a MetaDAO ICO in October 2025, with the treasury controlled by futarchy; operating entity Phoenix DAO LLC. Founders not named on the site.
• Token: $UMBRA
• Audits: None published

Umbra contracts on Robinhood Chain

• Umbra shielded pool (Nimbus) 0x1224be8ae49a1795158acec97698e8b122a19740
• Umbra governance timelock 0x06c2401207bd47bf96a41d912bc44165bfd38559

Similar projects

• Privacy Cash — Send ETH or USDG privately: deposit into a shared pool, then withdraw to a fresh address with no visible link.
• CloakSwap — Bridge aggregator into Robinhood Chain that can deliver to a different wallet, plus its own launchpad and index factory.
• UNCX Network — Lock liquidity or vest team tokens so buyers can check on-chain that funds can't be pulled early.
• vfat.tools — See farm yields and your positions across Robinhood Chain protocols, and deposit, claim or compound from one page.

All Robinhood Chain projects · Infrastructure & Other projects