Caliptra
An open-source silicon root-of-trust block letting chips verify their own firmware, backed by OCP and hyperscalers.
Current numbers
2026year Caliptra silicon-RoT IP begins appearing in shipping AI chips; Caliptra 2.1 adds data-at-rest protection
4 contributorsCaliptra open silicon RoT co-developed by Microsoft, Google, AMD, NVIDIA; committed in their first-party/server silicon
ML-DSA + ML-KEMpost-quantum signatures + KEM in Caliptra 2.x via open-source Adams Bridge accelerator (CNSA 2.0 path), side-channel hardened