Cubist

Cubist is a hardware-backed key management and embedded wallet infrastructure company built for high-performance digital asset operations. The company's flagship product, CubeSigner, provides SOC2-compliant, tamper-resistant key management using hardware security modules (HSMs) with FIPS 140 root of trust, enabling organizations to automate complex asset flows with programmable policies, fine-grained access controls, and cryptographic tenant isolation. Cubist also offers end-user custody via Wallet-as-a-Service and Confidential Cloud Functions for private smart contracts and verifiable off-chain code. Founded by world-renowned academics and practitioners in cryptography, systems security, and formal verification, the Cubist team has published over 80 peer-reviewed papers and previously designed cryptographic primitives underlying Ethereum and Avalanche, shipped sandboxing technology in Firefox, and identified high-severity vulnerabilities in Chrome. The company is backed by Polychain Capital.