Privacy stack updates on Solana

Solana’s privacy tooling is getting denser, with developers and researchers now pointing to a live cluster of payment, transfer, and encrypted-execution projects on the chain. (solana.com) (docs.umbraprivacy.com) (magicblock.xyz) Privacy on a public blockchain means hiding who paid whom, how much moved, or both, while still proving the transaction is valid. Solana’s 2026 Privacy Hack page lists tracks for private payments and privacy tooling and names teams including MagicBlock, Arcium, Helius, Inco Lightning, SilentSwap and Light Protocol. (solana.com) Umbra describes itself as a financial privacy layer for Solana built around confidential transactions, encrypted balances and anonymous transfers. Its documentation says the system uses a shielded pool, zero-knowledge proofs and selective transparency so users can disclose data to auditors without exposing all activity. (docs.umbraprivacy.com) MagicBlock is taking a different route: encrypted execution inside trusted hardware rather than only cryptographic proofs posted on-chain. Its Solana privacy page says private ephemeral rollups offer sub-50 millisecond execution, Intel Trust Domain Extensions attestation and selective privacy for payments and decentralized finance. (magicblock.xyz) That split shows the shape of Solana’s current privacy stack. Some projects focus on shielded transfers and breaking the on-chain link between deposits and withdrawals, while others focus on keeping application state private during execution and settling back to Solana later. (docs.umbraprivacy.com) (magicblock.xyz) Dark Null Protocol sits in the first camp. Parad0x Labs’ GitHub repository describes it as a zero-knowledge privacy layer for Solana that uses zero-knowledge succinct non-interactive arguments of knowledge, or cryptographic proofs that verify a payment without revealing its details. (github.com) The project’s public README says Dark Null is built for shield, pool and withdraw flows, claims roughly 400 millisecond finality on Solana, and says its smallest proofs are 144 bytes. The same page says the design includes maturity delays and audit tags, which the project presents as a compliance-first alternative to instant in-and-out mixers. (github.com) Other teams are shipping developer tools rather than only protocol research. Colosseum wrote on April 3, 2026 that Umbra had released a TypeScript software development kit for mainnet and devnet, while MagicBlock had launched a private payments application programming interface beta for confidential USD Coin transfers on Solana mainnet. (blog.colosseum.com) Colosseum said MagicBlock’s beta uses a two-step flow in which users delegate USD Coin into a private rollup and an automated crank settles funds back to Solana without a visible on-chain link between sender and receiver. The same report said the API includes wallet screening, anti-money-laundering checks and default geofencing for Office of Foreign Assets Control-sanctioned jurisdictions. (blog.colosseum.com) Solana itself is now sponsoring that buildout in public. Its January 12-30, 2026 Privacy Hack advertised more than $100,000 in prizes for private transfers, confidential decentralized finance, dark pools, games and privacy infrastructure, giving the chain a formal venue for the projects now being grouped into a broader privacy stack. (solana.com) I could verify the broader ecosystem claims and the current positioning of Umbra, MagicBlock and Dark Null from primary project pages and Solana’s own hackathon site. I could not independently verify the specific “v1.23,” “32-byte withdrawals,” and “anti-griefing bonds” claims from accessible primary documentation, because the cited X posts did not render in the browser tool and those exact terms were not visible in the public materials I could open.