Privacy Cash

Privacy Cash is a zero-knowledge proof privacy protocol on Solana that breaks the on-chain link between a deposit address and a withdrawal address. Launched in August 2025, it processed over 121 million dollars in private transfers in its first 100 days and has since expanded to private token swaps, cross-chain bridging, and multiple EVM networks, while maintaining four independent security audits and on-chain compliance screening.

How It Works

Privacy Cash implements a shielded pool architecture familiar from protocols like Tornado Cash, rebuilt from the ground up for Solana and designed with regulatory compliance at the core. When a user deposits SOL, the protocol generates a cryptographic commitment that is inserted into an on-chain Merkle tree. The depositor receives a private note, a secret that proves ownership of that commitment, but no on-chain record links the deposit transaction to any future withdrawal. To withdraw, the user generates a zero-knowledge proof built using Circom v2.2.2 circuits that proves knowledge of a valid commitment in the tree without revealing which specific leaf corresponds to the withdrawal. The SOL is then sent to any recipient address the user specifies, with no traceable connection to the original deposit.

This deposit-commitment-withdrawal model means that even a sophisticated chain analyst cannot determine who sent funds to whom, provided the anonymity set is large enough. Privacy Cash grows that anonymity set through volume: with over 61,000 transactions and 11,700 wallets interacting with the protocol in its first few months, it has built one of the largest shielded pools in the Solana ecosystem.

Key Features

Private SOL Transfers. The core product allows users to deposit SOL in any amount and withdraw to any Solana address. Withdrawals carry a 0.35% fee plus 0.006 SOL, with no fee on deposits. The fee revenue is entirely on-chain and transparent; during the first 100 days, the protocol collected 1,350 SOL (approximately 241,000 dollars) in fees, with peak daily fee income of 60 SOL.

Private Token Swaps. Launched in January 2026, the shielded swap feature routes trades through a temporary ephemeral wallet generated client-side. The ephemeral wallet executes a swap via [[PROJECT:219]] and the output token is reshielded back into the privacy pool before arriving in the destination wallet. This means the swap execution address has no durable connection to either the sender or the recipient. Supported swap assets at launch included SOL, USDC, USDT, ZEC, ORE, and stORE. The feature drove daily active addresses to an all-time high of 1,192 wallets on its launch day.

Cross-Chain Bridge. The protocol includes a bridge function that allows users to move assets between Solana and EVM-compatible chains, with Ethereum, Base, BNB Chain, and Robinhood Chain all supported. Solana remains the dominant chain by volume, accounting for approximately 95.5% of total value locked, but Privacy Cash has expanded its EVM presence aggressively in 2026, with new SDK repositories for EVM chains published as recently as August 2026.

Security and Compliance

Privacy Cash has been audited by four independent security firms: Accretion, HashCloak, Zigtur, and Kriko. The audit verification is published on-chain with hash c6f1e5336f2068dc1c1e1c64e92e3d8495b8df79f78011e2620af60aa43090c5, making the audit link immutable and independently verifiable. The technical stack relies on Circom v2.2.2 circuits and the Anchor framework on Solana.

On the compliance side, Privacy Cash integrates CipherOwl for OFAC screening at the point of deposit. Wallet addresses flagged against sanctions lists are rejected before funds enter the shielded pool. This approach, enforcement at the deposit gate rather than at the protocol level, mirrors how other compliant privacy solutions have approached regulatory alignment, and it has been a consistent part of the project positioning since launch.

Adoption and Traction

The growth trajectory has been strong by Solana DeFi standards. In its first 100 days ending roughly late November 2025, Privacy Cash processed over 680,000 SOL (approximately 121 million dollars) in deposits and withdrawals. Weekly transfer volumes ranged from 3.3 million to 15.4 million dollars, with a peak single-day volume of 32,500 SOL (4.24 million dollars). Deposit size distribution showed broad usage: the 100 to 1,000 dollar range accounted for 37,700 transactions (37.8% of all deposits), while the 10,000 to 50,000 dollar range generated the largest aggregate dollar volume at 46.4 million dollars.

By the time swaps launched in January 2026, lifetime transfer volume had grown to 174 million dollars and TVL stood above 2.1 million dollars. Privacy Cash held approximately 8% share of the wider privacy mixer market at that point, with daily active wallet counts climbing from a baseline of 136 in October 2025 to over 399 by the end of the first 100-day window, and exceeding 1,000 on key milestone days.

The protocol has continued expanding in 2026. In August 2026, the project reported 1.3 million dollars in private transfers in its first month on Robinhood Chain, indicating momentum across new networks.

Team

The Privacy Cash team is not publicly identified. The GitHub organization lists no public members, and no founder or team information appears in official communications. The protocol is open-source under a public GitHub repository that has accumulated 139 stars and 57 forks, suggesting meaningful developer interest, but the builders operate pseudonymously. The project founding date is recorded as June 2025, with public launch following in late August 2025.

Solana Ecosystem Fit

Privacy Cash addresses one of the more persistent gaps in the Solana ecosystem: financial privacy for ordinary users. Solana's transparent ledger makes every transaction publicly traceable by default, which creates real-world exposure for users conducting large transfers, payroll, or sensitive business activity. The shielded pool approach offers meaningful protection without requiring users to trust a centralized intermediary.

The [[PROJECT:219]] routing integration for private swaps connects the protocol directly to Solana's deepest liquidity layer, ensuring that shielded trades execute at competitive rates. The multi-chain expansion reflects a broader thesis that privacy infrastructure should be chain-agnostic, even as Solana remains the primary market.

With four audits completed, on-chain compliance screening active, and over 270 million dollars in cumulative transfer volume as of early 2026, Privacy Cash has established itself as the leading privacy protocol on Solana, and one of the few in the broader crypto ecosystem to pair meaningful adoption with a publicly verifiable compliance posture.