Base Goes ZK, Polygon Unlocks Private Stablecoin Transfers, Kalshi Hits $22B Valuation in Mega Raise!

A dense week of infrastructure upgrades and capital moves across the crypto stack. Base is adopting zero-knowledge proofs for finality, a shift that would let the Coinbase-backed L2 settle state transitions cryptographically rather than relying solely on optimistic fraud-proof windows — compressing finality times and raising the security floor for the entire Base ecosystem.

Polygon is launching private stablecoin transfers, bringing ZK-powered confidentiality to on-chain dollar flows — a move that targets institutional and enterprise users who need settlement privacy without leaving the on-chain rails. Separately, prediction market platform Kalshi closed a $1 billion raise at a $22 billion valuation, one of the largest fintech rounds of the year and a signal that regulated real-money prediction markets are attracting serious TradFi capital.

Zcash is also advancing its post-quantum…