secretvm-verify 0.8.2

Attestation verification for Intel TDX, AMD SEV-SNP, and NVIDIA GPU

secretvm-verify

Attestation verification SDK for confidential computing environments. Verifies Intel TDX, AMD SEV-SNP, and NVIDIA GPU attestation quotes, with end-to-end Secret VM verification that validates CPU attestation, GPU attestation, and the cryptographic bindings between them.

What it verifies

• Intel TDX — Performs full Intel DCAP quote verification, delegating the cryptographic checks to the upstream dcap-qvl library. Verifies the PCK certificate chain against a pinned Intel SGX Root CA, the QE Identity, PCK CRL and Root CA CRL revocation, the TCB Info signature, the TCB status, the quote signature, and the QE report binding. Collateral (TCB Info, QE Identity, CRLs, issuer chains) is fetched from a Provisioning Certificate Caching Service (PCCS) — defaults to SCRT Labs' deployment. A sync entry point (check_tdx_cpu_attestation) and an async entry point (check_tdx_cpu_attestation_async) are both exposed; use the async variant from inside an event loop.
• AMD SEV-SNP — Parses a SEV-SNP attestation report, fetches the VCEK certificate from AMD's Key Distribution Service, verifies the ECDSA-P384 report signature, and validates the certificate chain (VCEK -> ASK -> ARK).
• NVIDIA GPU — Submits GPU attestation evidence to NVIDIA's Remote Attestation Service (NRAS), verifies the returned JWT signatures against NVIDIA's published JWKS keys, and extracts per-GPU attestation claims.
• SecretVM workload — Given a TDX or SEV-SNP quote and a docker-compose.yaml, determines whether the quote was produced by a known SecretVM image and verifies the exact compose file that was booted.
• Secret VM — End-to-end verification that connects to a VM's attestation endpoints, verifies CPU and GPU attestation, and validates TLS and GPU cryptographic bindings.
• Proof of cloud — POSTs a CPU quote to SCRT Labs' /api/quote-parse endpoint, which confirms the quote originated on a Secret VM and returns its origin and machine_id. Opt-in: pass check_proof_of_cloud=True to check_secret_vm / check_agent / verify_agent, or use --proof-of-cloud on the CLI. A standalone check_proof_of_cloud / check_proof_of_cloud_async function is also exposed.
• ERC-8004 Agent verification — End-to-end verification of on-chain AI agents registered under the ERC-8004 standard. Resolves agent metadata from any supported blockchain (Ethereum, Base, Arbitrum, Polygon, and 14 more), discovers the agent's TEE attestation endpoints, and runs the full verification flow. Three composable functions:
  • resolve_agent — Queries the on-chain registry contract for the agent's metadata.
  • verify_agent — Takes agent metadata and runs full TEE verification against the agent's declared endpoints.
  • check_agent — End-to-end: resolves the agent on-chain, then verifies it.

Installation

pip install secretvm-verify

Quick start

Verify a Secret VM (recommended)

The simplest way to verify a VM — handles CPU detection, GPU detection, and all binding checks automatically.

from secretvm.verify import check_secret_vm

result = check_secret_vm("my-vm.example.com")

print(result.valid)           # True if all checks pass
print(result.attestation_type) # "SECRET-VM"
print(result.checks)          # {"cpu_quote_fetched": True, "tls_cert_fetched": True, ...}
print(result.report)          # {"tls_fingerprint": "...", "cpu": {...}, "cpu_type": "TDX", ...}
print(result.errors)          # [] if no errors

Verify an ERC-8004 agent

Verify an AI agent registered on-chain using the ERC-8004 standard. Supports 18 chains including Ethereum, Base, Arbitrum, and more.

from secretvm.verify import check_agent

# End-to-end: resolve on-chain + verify TEE attestation
result = check_agent(38114, "base")

print(result.valid)            # True if all checks pass
print(result.attestation_type) # "ERC-8004"
print(result.checks)          # {"agent_resolved": True, "metadata_valid": True, ...}

You can also work with the individual steps:

from secretvm.verify import resolve_agent, verify_agent

# Step 1: Resolve agent metadata from the blockchain
metadata = resolve_agent(38114, "base")
print(metadata.name)             # Agent name
print(metadata.services)         # [AgentService(name="teequote", endpoint="..."), ...]
print(metadata.supported_trust)  # ["tee-attestation"]

# Step 2: Verify the agent's TEE attestation
result = verify_agent(metadata)

RPC configuration: Set SECRETVM_RPC_BASE (or SECRETVM_RPC_<CHAIN>) environment variable to use your own RPC endpoint. Falls back to public RPCs if not set.

Resolve SecretVM version from a quote

Given a TDX or SEV-SNP quote, determine which official SecretVM template and version produced it:

from secretvm.verify import resolve_secretvm_version

result = resolve_secretvm_version(open("cpu_quote.txt").read())
if result:
    print(result["template_name"])  # e.g. "small"
    print(result["artifacts_ver"])  # e.g. "v0.0.25"
else:
    print("Not a known SecretVM")

Verify a workload (quote + docker-compose)

Verify that a quote was produced by a known SecretVM and that it was running a specific docker-compose.yaml:

from secretvm.verify import verify_workload, format_workload_result

# Auto-detects TDX vs SEV-SNP:
result = verify_workload(
    open("cpu_quote.txt").read(),
    open("docker-compose.yaml").read(),
)

print(result.status)        # "authentic_match" | "authentic_mismatch" | "not_authentic"
print(result.template_name) # e.g. "small"  (None when not_authentic)
print(result.artifacts_ver) # e.g. "v0.0.25" (None when not_authentic)
print(result.env)           # e.g. "prod"    (None when not_authentic)
print(format_workload_result(result))  # human-readable summary

Verify a CPU quote (auto-detect TDX vs SEV-SNP)

All verification functions accept either raw quote data or a VM URL. When a URL is passed, the quote is automatically fetched from the VM's attestation endpoint.

from secretvm.verify import check_cpu_attestation

# From a file:
result = check_cpu_attestation(open("cpu_quote.txt").read())

# Or directly from a VM URL:
result = check_cpu_attestation("blue-moose.vm.scrtlabs.com")

print(result.attestation_type)  # "TDX" or "SEV-SNP"
print(result.valid)

This works with all functions: check_tdx_cpu_attestation, check_sev_cpu_attestation, check_nvidia_gpu_attestation, verify_workload, resolve_secretvm_version. When a URL is passed to verify_workload, both the quote and docker-compose are fetched automatically.

API reference

AttestationResult

All functions return an AttestationResult with these fields:

Field	Type	Description
valid	bool	Overall pass/fail
attestation_type	str	"TDX", "SEV-SNP", "NVIDIA-GPU", or "SECRET-VM"
checks	dict	Individual verification steps
report	dict	Parsed attestation fields
errors	list	Error messages for failed checks

Functions

check_secret_vm(url, product="", reload_amd_kds=False, check_proof_of_cloud=False)

End-to-end Secret VM verification. Connects to <url>:29343, fetches CPU and GPU quotes, verifies both, and checks TLS and GPU bindings.

Parameters:

• url — VM address (e.g., "my-vm.example.com", "https://my-vm:29343")
• product — AMD product name ("Genoa", "Milan", "Turin"). Only needed for SEV-SNP, auto-detected if omitted.
• reload_amd_kds — If True, bypass the AMD KDS cache (no effect on TDX).
• check_proof_of_cloud — If True, also POST the quote to SCRT Labs' /api/quote-parse endpoint. Opt-in; off by default.

The returned result.report["docker_compose"] contains the raw docker-compose the VM served.

check_cpu_attestation(data, product="")

Auto-detects Intel TDX vs AMD SEV-SNP and delegates to the appropriate function.

check_tdx_cpu_attestation(data)

Verifies an Intel TDX Quote v4.

check_sev_cpu_attestation(data, product="")

Verifies an AMD SEV-SNP attestation report.

check_nvidia_gpu_attestation(data)

Verifies NVIDIA GPU attestation via NRAS.

check_proof_of_cloud(quote) / check_proof_of_cloud_async(quote)

POSTs a raw CPU quote to SCRT Labs' /api/quote-parse endpoint. Returns an AttestationResult with attestation_type="PROOF-OF-CLOUD" and a single check proof_of_cloud_verified. The report exposes origin, proof_of_cloud, status, and machine_id. Also runs automatically inside check_secret_vm.

The Node CLI also splices this verdict into the output of --cpu, --tdx, and --sev as the proof_of_cloud_verified check row.

resolve_secretvm_version(data)

Looks up a quote in the SecretVM artifact registry. Returns the matching template name and version, or None if not found.

verify_workload(data, docker_compose_yaml, docker_files=None, docker_files_sha256=None)

Auto-detects quote type and verifies that it was produced by a known SecretVM running the given docker-compose. The optional docker_files (raw bytes of the archive) or docker_files_sha256 (hex digest) supports TDX VMs that bake a Dockerfiles archive into the image. SEV-SNP ignores these.

verify_tdx_workload(data, docker_compose_yaml, docker_files=None, docker_files_sha256=None)

TDX-specific workload verification. When docker_files or docker_files_sha256 is provided, the SHA-256 of the archive is appended to the RTMR3 replay as log[2].

verify_sev_workload(data, docker_compose_yaml, docker_files=None, docker_files_sha256=None)

SEV-SNP-specific workload verification. When docker_files or docker_files_sha256 is provided, the digest is appended to the kernel cmdline as docker_additional_files_hash=<hex> before the SEV-SNP GCTX launch measurement is recomputed.

format_workload_result(result)

Formats a WorkloadResult as a human-readable string.

WorkloadResult

Field	Type	Description
status	str	"authentic_match", "authentic_mismatch", or "not_authentic"
template_name	str | None	SecretVM template (e.g. "small")
artifacts_ver	str | None	Artifacts version (e.g. "v0.0.25")
env	str | None	Environment (e.g. "prod")

ERC-8004 Agent Functions

check_agent(agent_id, chain)

End-to-end ERC-8004 agent verification. Resolves agent metadata from the on-chain registry, then verifies TEE attestation.

resolve_agent(agent_id, chain)

Resolves an agent's metadata from the on-chain registry contract. Returns an AgentMetadata dataclass.

verify_agent(metadata)

Verifies an ERC-8004 agent given its metadata. Discovers teequote/workload endpoints and runs the full verification flow.

AgentMetadata

Field	Type	Description
name	str	Agent name
description	str	Agent description
supported_trust	list[str]	Trust models (must include "tee-attestation")
services	list[AgentService]	Service endpoints (name + endpoint)

RPC Configuration

An RPC URL must be provided via environment variable to use the ERC-8004 agent functions. No default RPCs are shipped with the package.

Set one of:

• SECRETVM_RPC_<CHAIN> — chain-specific (e.g. SECRETVM_RPC_BASE, SECRETVM_RPC_ETHEREUM)
• SECRETVM_RPC_URL — generic fallback for all chains

Example:

export SECRETVM_RPC_BASE="https://base-mainnet.g.alchemy.com/v2/YOUR_KEY"

Supported chains: ethereum, base, arbitrum, sepolia, polygon, bnb, gnosis, linea, taiko, celo, avalanche, optimism, abstract, megaeth, mantle, soneium, xlayer, metis.

CLI usage

cd python
pip install -e .
python check_vm.py https://my-vm:29343
python check_vm.py https://my-vm:29343 --json    # minimal JSON
python check_vm.py https://my-vm:29343 --raw     # full JSON with parsed report
python check_vm.py https://my-vm:29343 --product Genoa

External services

The library contacts these services during verification:

Service	Used by	Purpose
SCRT PCCS	TDX	DCAP collateral (TCB Info, QE Identity, PCK CRL, Root CA CRL, issuer chains)
AMD KDS	SEV-SNP	VCEK certificate, AMD CA cert chain (ASK + ARK), CRL
NVIDIA NRAS	GPU	GPU attestation verification

AMD KDS caching

To minimize calls to kdsintf.amd.com (which is rate-limited and returns HTTP 429 under load) the AMD SEV-SNP verifier caches all three KDS responses to disk. The cache is on by default; nothing to enable.

Item	TTL	Cache key
VCEK certificate	30 days	(product, chip_id, ucode_SPL, snp_SPL, tee_SPL, bl_SPL) — full TCB tuple
AMD CA cert chain (ASK + ARK)	30 days	product
CRL	from the CRL's own X.509 nextUpdate field (typically ~7 months for AMD); falls back to 7 days if nextUpdate is missing or unparseable	product

The VCEK cache key includes the full TCB tuple because AMD issues a distinct VCEK per (chip, TCB version). A microcode update on the same chip becomes a cache miss with the new key, fetching the updated VCEK as expected.

Cache location. Default ~/.cache/secretvm-verify/amd/. Override with the SECRETVM_VERIFY_CACHE_DIR environment variable; the library appends /amd to whatever you set:

export SECRETVM_VERIFY_CACHE_DIR=/var/cache/myapp
# → entries land in /var/cache/myapp/amd/{vcek,cert_chain,crl}/

Each cached entry is two files: the payload (DER bytes for VCEK and CRL, PEM text for the cert chain) and a sidecar <name>.expires containing the Unix-epoch expiration time.

Inspect cached entries:

ls -lR ~/.cache/secretvm-verify/amd/

# Decode a specific VCEK
openssl x509 -in ~/.cache/secretvm-verify/amd/vcek/<file> -inform DER -text -noout

# Decode the CRL — see revoked serials and nextUpdate
openssl crl -in ~/.cache/secretvm-verify/amd/crl/Genoa -inform DER -text -noout

Network failure fallback. If AMD KDS is unreachable or returns an error, the cache falls back to a stale entry rather than failing the verification. Better to verify with a slightly old CRL than to fail every SEV-SNP attestation while KDS is down.

Force a refresh (skip the cache for this call, fetch fresh, write back to cache):

CLI:

python check_vm.py <url> --reload-amd-kds

Programmatic — pass reload_amd_kds=True:

result = check_sev_cpu_attestation(quote, product="Genoa", reload_amd_kds=True)
result = check_secret_vm(url, reload_amd_kds=True)
result = check_cpu_attestation(quote, product="Genoa", reload_amd_kds=True)
result = check_agent(agent_id, "base", reload_amd_kds=True)

# Async variants accept the same parameter
result = await check_sev_cpu_attestation_async(quote, product="Genoa", reload_amd_kds=True)
result = await check_secret_vm_async(url, reload_amd_kds=True)

The reload_amd_kds parameter has no effect on Intel TDX verification (TDX doesn't cache; the upstream dcap-qvl library manages its own ephemeral state).

To clear the cache entirely:

rm -rf ~/.cache/secretvm-verify/amd

Requirements

• Python >= 3.10
• requests, cryptography, PyYAML, web3, dcap-qvl (TDX quote verification)

No system-level dependencies. AMD SEV-SNP certificate chains (RSA-PSS) are verified natively via cryptography.

License

MIT