Caution

Caution is a hosting platform aimed at teams running workloads they cannot afford to have tampered with or exfiltrated, such as AI inference, crypto custody, fintech ledgers, and healthcare systems. Developers deploy their software into secure enclaves and then hand customers, auditors, or counterparties a cryptographic proof that the exact release approved in the build pipeline is what is actually executing in production, rather than an opaque binary they have to take on faith. The company pairs reproducible builds, so an enclave image can be independently rebuilt from source and matched against what is deployed, with multi-hardware attestation, so proofs do not rest on a single vendor's root of trust like Intel TDX, AMD SEV, or AWS Nitro. The launch matters now because confidential compute has largely stayed in the "trust us" zone, where attestation confirms code has not changed at runtime but cannot confirm what the code originally was. Caution's argument is that attestation without reproducible builds is still a black box, since there is no way to prove the code in the enclave matches the published source. The company positions the platform as fully open source infrastructure that customers and outside reviewers can inspect, which is unusual for hosting products in this category. It is currently in private beta, with access gated through a conversation with their engineering team. Caution is part of Y Combinator's S26 batch and was founded by Anton Livaja, CEO, and Lance Vick, CTO, both longtime security engineers channeling prior work securing high-value systems into the product. For founders and operators evaluating where to put sensitive services, the launch is worth a look as an alternative to standard cloud hosting when the question "what is actually running on that server right now" has to be answerable with evidence rather than a status page.