𝗣𝗿𝗶𝗺𝘂𝘀 𝗜𝘀 𝗦𝗲𝗰𝘂𝗿𝗶𝗻𝗴 𝗧𝗵𝗲 𝗔𝘁𝘁𝗲𝘀𝘁𝗼𝗿 𝗕𝗲𝗵𝗶𝗻𝗱 𝗧𝗵𝗲 𝗣𝗿𝗼𝗼𝗳 When people talk about zkTLS security, the focus usually goes to the proof. But there is another layer that is easy to overlook: What protects the attestor generating and signing that proof? This matters because the attestor sits between external Web2 information and the Web3 application consuming the result. 𝗧𝗵𝗲 𝗔𝘁𝘁𝗲𝘀𝘁𝗼𝗿 𝗜𝘀 𝗣𝗮𝗿𝘁 𝗢𝗳 𝗧𝗵𝗲 𝗧𝗿𝘂𝘀𝘁 𝗠𝗼𝗱𝗲𝗹 A simplified zkTLS flow looks like: → Access information from a Web2 source → Run the zkTLS protocol → Generate the relevant proof → Sign the attestation → Deliver it for verification The cryptography can verify the proof, but the infrastructure producing it still needs protection. If the keys are exposed or the software is compromised, the trust model has another problem to deal with. This is where Primus takes an interesting approach. 𝗛𝗮𝗿𝗱𝘄𝗮𝗿𝗲 𝗕𝗲𝗵𝗶𝗻𝗱 𝗧𝗵𝗲 𝗔𝘁𝘁𝗲𝘀𝘁𝗼𝗿 @primus_labs integrates Phala's Trusted Execution Environment, or TEE, into its attestor node software. The goal is to protect both the runtime and the sensitive keys involved in attestation. The first layer is key management. Critical keys are generated and managed through a TEE-based KMS, so the attestor software doesn't simply receive the raw private key material. Instead: → Keys remain protected → Signing happens inside the protected environment → The application doesn't directly handle raw key material That creates a stronger boundary around the credentials responsible for signing attestations. 𝗧𝗵𝗲 𝗖𝗼𝗱𝗲 𝗡𝗲𝗲𝗱𝘀 𝗣𝗿𝗼𝘁𝗲𝗰𝘁𝗶𝗼𝗻 𝗧𝗼𝗼 Protecting keys alone isn't enough. The software running the attestor also matters. Primus uses the TEE to provide a controlled execution environment for the attestor, with verified software versions used to reduce the risk of unauthorized code being introduced. So the security model is not based on one protection mechanism. It layers several controls: → Correct zkTLS execution → Protected signing keys → Verified software versions → Hardware-backed runtime 𝗪𝗵𝘆 𝗧𝗵𝗶𝘀 𝗠𝗮𝘁𝘁𝗲𝗿𝘀 𝗙𝗼𝗿 𝗪𝗲𝗯𝟮 𝗗𝗮𝘁𝗮 Consider a Web3 application that wants to verify information from an existing Web2 service. The application isn't simply trusting a website. It receives an attestation generated by an attestor that has to correctly execute the protocol and securely sign the result. That makes the attestor part of the security boundary: Web2 Data → Attestor → Proof → Web3 Application If the attestor is compromised, the problem exists before the proof reaches the blockchain. 𝗣𝗿𝗶𝗺𝘂𝘀 𝗜𝘀 𝗦𝗲𝗰𝘂𝗿𝗶𝗻𝗴 𝗧𝗵𝗲 𝗣𝗿𝗼𝗼𝗳 𝗣𝗿𝗼𝗱𝘂𝗰𝗲𝗿 This is the deeper part of Primus that I find interesting. The system isn't treating an attestor as just a server that runs zkTLS. It is securing the environment around: → The code executing the protocol → The keys signing attestations → The software allowed to run → The hardware protecting execution Because a cryptographic proof is only one part of the trust chain. The infrastructure producing and signing that proof needs its own security guarantees too. That gives Primus a layered model where the goal isn't only to prove what the data says, but to strengthen the environment responsible for proving it.