Tinfoil Enclaves serve the remote attestation document (RAD) over HTTP at the well known endpoint /.well-known/tinfoil-attestation.

The document is a JSON object containing a type and a signed enclave remote attestation payload.

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Schema

{
  "format": "<PREDICATE_TYPE>",
  "body": "<ATTESTATION_BODY>"
}

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Fields

The RAD is represented as a JSON object with the following fields:

format string (TypeURI), required

URI identifying the type of attestation format. This URI is identical to the predicate TypeURI field in the enclave’s Sigstore attestations, conformant to in-toto.io/Statement/v1.

body string, required

The attestation document body containing the measurements and verification data. Format and content requirements depend on the specified attestation format.

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Supported Formats

Tinfoil currently supports the following remote attestation formats:

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AMD SEV-SNP Guest Attestation v1

Format URI: https://tinfoil.sh/predicate/sev-snp-guest/v1

AMD SEV-SNP (Secure Encrypted Virtualization - Secure Nested Paging) provides hardware-based memory encryption and integrity protection for virtual machines. The attestation format is the base64 representation of the AMD SEV-SNP Guest Attestation specification.

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AWS Nitro Enclave Attestation v1

Format URI: https://tinfoil.sh/predicate/aws-nitro-enclave/v1

AWS Nitro Enclaves provide isolated compute environments to protect and process highly sensitive data. The attestation format is the base64 representation of the AWS Nitro Enclave attestation specification.