Solana privacy layer project Umbra and Solana token distribution platform Streamflow have launched an on-chain private token vesting feature, allowing project teams to unlock and distribute tokens on Solana confidentially. This feature is supported by Arcium's cryptographic execution engine, which can hide actual transfer information while maintaining distribution mechanisms such as time locks and price conditions. Recipients receive the unlocked tokens through the Umbra wallet. Both parties stated that this move aims to reduce risks of front-running, monitoring, and information asymmetry caused by full transparency on the chain during token unlocks. (The Block)