FHEVM Veil Stack

A Confidential, Decentralized Container Orchestration Layer Powered by FHE

Veil Stack is a privacy-preserving, decentralized container orchestration platform that enables organizations and distributed compute networks to securely schedule and manage containerized workloads without exposing sensitive operational data. Built on libp2p for peer-to-peer coordination and anchored by an Ethereum smart contract for shared state and governance, Veil Stack introduces Zama’s Universal Fully Homomorphic Encryption (FHE) SDK to enable encrypted cluster telemetry, scheduling decisions, and policy enforcement.

In Veil Stack, cluster nodes never need to reveal their resource utilization metrics, performance data, or workload profiles. Instead, orchestration logic operates directly on encrypted inputs, ensuring that:

• Resource data remains confidential
• Scheduling decisions remain optimal
• No cluster member gains insight into another’s infrastructure
• The orchestration layer is trustless and verifiable

This makes Veil Stack the first orchestration system capable of operating in zero-trust distributed compute environments, where nodes may be owned by different organizations, providers, or decentralized network participants.

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Why Veil Stack Matters

Conventional orchestrators (Kubernetes, Nomad, DC/OS) require centralized control and full visibility into all cluster internals. This creates risks:

• Sensitive performance or topology data can leak.
• Cross-institutional collaboration becomes impossible without trust.
• Operators are forced to centralize their infrastructure and governance.

Veil Stack removes that trust bottleneck.

By combining:

Component	Responsibility
libp2p	Peer discovery, messaging, cluster health gossip (SWIM)
Ethereum smart contract	State anchoring, membership registry, governance & cluster metadata
Zama Universal FHE SDK	Encrypted scheduling, encrypted decision functions, confidential policy enforcement

Veil Stack turns container orchestration into a trust-minimized protocol, not a centralized control plane.

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Key Capabilities

Capability	Description
Encrypted Resource Scheduling	Nodes share encrypted utilization and performance signals; scheduling runs entirely on ciphertext.
Zero-Trust Cluster Federation	Multiple organizations can operate as one cluster without exposing internal infrastructure.
Decentralized Control Plane	No single point of failure; operations continue even if nodes drop offline.
Confidential Replication & Redundancy	Workloads can be mirrored across nodes without revealing topology or load patterns.

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Example Use Cases

• Healthcare compute cooperatives where patient-data-derived workloads require strict confidentiality
• Cross-cloud ML training clusters where cloud providers should not see competitor data
• Decentralized cloud and edge compute networks where participants are semi-trusted or anonymous
• Governmental or defense computing environments requiring operational secrecy

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Outcome

Veil Stack creates the foundation for the Confidential Decentralized Cloud — where compute is:

• Peer-to-peer
• Verifiable
• Always available
• And encrypted end-to-end

Veil Stack — Architecture Diagram

This document provides a text-based architecture diagram and explanation suitable for inclusion in a GitHub repo README. It uses ASCII/mermaid diagrams and step-by-step flows to describe how Veil Stack (Veil Stack = canteen + Zama FHE + libp2p + Ethereum) coordinates privacy-preserving, decentralized container orchestration.

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Overview

Veil Stack is a decentralized orchestration layer that performs scheduling and policy evaluation on encrypted telemetry using Zama's Universal FHE SDK. The network relies on libp2p for peer-to-peer networking and SWIM-style health gossip, and an Ethereum smart contract for membership, governance, and anchoring important cluster metadata.

This file contains:

• A high level ASCII diagram
• A mermaid sequence diagram (GitHub-friendly)
• Component descriptions
• Data flow / step-by-step scheduling flow
• Example configuration snippets (env / contract pointers)

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High-level ASCII diagram

+----------------------+      +----------------------+      +----------------------+
|   Operator / UI      | <--> |  Ethereum / Smart    | <--> |  Governance / ACLs   |
|  (CLI / Dashboard)   |      |  Contract (Registry) |      |  (on-chain policies) |
+----------------------+      +----------------------+      +----------------------+
         ^   |                          ^   |                         
         |   |                          |   |                       
         |   v                          |   v                       
+----------------------+      +----------------------+      +----------------------+
|   Veil Node A        | <--> |   Veil Node B        | <--> |   Veil Node C        |
|  (libp2p host)       |      |  (libp2p host)       |      |  (libp2p host)       |
|  - SWIM gossip       |      |  - SWIM gossip       |      |  - SWIM gossip       |
|  - Zama FHE runtime  |      |  - Zama FHE runtime  |      |  - Zama FHE runtime  |
|  - Encrypted metrics |      |  - Encrypted metrics |      |  - Encrypted metrics |
|  - Local DockerExec  |      |  - Local DockerExec  |      |  - Local DockerExec  |
+----------------------+      +----------------------+      +----------------------+
         |                           |                           |
         v                           v                           v
+----------------------+      +----------------------+      +----------------------+
|  Docker Host(s)      |      |  Docker Host(s)      |      |  Docker Host(s)      |
|  (runs containers)   |      |  (runs containers)   |      |  (runs containers)   |
+----------------------+      +----------------------+      +----------------------+

Notes:

• Veil Nodes form a mesh using libp2p for discovery and messaging.
• Scheduling inputs (CPU, mem, priority) are encrypted with Zama FHE; scheduling decision logic operates on ciphertexts.
• The Ethereum smart contract holds registry, membership, and high-level governance metadata (e.g., allowed images, staking, ACLs).

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Mermaid sequence diagram (GitHub rendered)

sequenceDiagram
    participant Operator
    participant Contract as Ethereum
    participant NodeA
    participant NodeB
    participant Zama
    participant Docker

    Operator->>Contract: registerCluster() / upload policy
    Operator->>NodeA: deploy veil-node (config -> contract address)
    NodeA->>Contract: readClusterMetadata()
    NodeA->>NodeB: libp2p SWIM: gossip (encrypted metrics)
    NodeB->>Zama: evaluate_schedule(encrypted_metrics)
    Zama-->>NodeB: encrypted_decision
    NodeB->>Docker: docker pull && docker run
    NodeB->>Contract: anchorDeployment(tx)
    Contract-->>Operator: deploymentConfirmed

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Component descriptions

Operator / Dashboard

• CLI or web dashboard used by cluster admins to register clusters, define policies, and publish container images (images still on Docker Hub / registry).

Ethereum Smart Contract (Registry / Governance)

• Stores cluster registry, operator keys, ACLs, allowed image lists, and anchors important lifecycle events (e.g., deployments).
• Provides on-chain governance hooks to dispute or audit scheduling outcomes (high level only — heavy computation is off-chain).

Veil Node (Veil Stack runtime)

• libp2p host for peer discovery, pubsub, and direct messaging.
• Implements a SWIM-like health protocol to maintain liveness information.
• Integrates Zama Universal FHE SDK to encrypt and compute on telemetry.
• Exposes local container runtime access (Docker / containerd) for launching workloads.
• Can operate with optional state-channels / off-chain compute layers for heavier scheduling ops.

Zama FHE Runtime

• Provides encryption, ciphertext arithmetic, and evaluation APIs. Scheduling logic (e.g., cost function) is expressed as FHE evaluable circuits or functions.
• Ciphertext inputs: node resource metrics, node priority, replica preferences, constraints.
• Ciphertext outputs: scheduling decisions (which node(s) should host a given container), which then are decrypted by the requester or a designated decryption authority (depending on trust model).

Docker Host(s)

• Hosts actually run container images; they are controlled by the local Veil Node's DockerExec.
• Images are still pulled from regular registries (e.g., Docker Hub, private registries). Image manifests and signatures can be anchored on-chain or via registry.

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Data flow & scheduling steps (detailed)

1. Cluster registration

• Operator deploys the Veil Stack smart contract (or uses an existing one).
• Operator registers node identities (libp2p peerIDs) and governance keys with the contract.

2. Node boot & discovery

• Each Veil Node boots with configuration pointing to the contract address and local FHE key material (public key share or ephemeral key depending on the model).
• Nodes join mesh via libp2p and exchange encrypted heartbeats / metrics via SWIM.

3. Encrypted telemetry exchange

• Each node gathers resource metrics (CPU, mem, disk, GPU availability, latency) and encrypts them with Zama's FHE public key.
• Encrypted metrics are gossiped or sent to the candidate scheduler nodes.

4. FHE scheduling evaluation

• A scheduler (could be elected via simple leader-election or run redundantly) collects ciphertexts and runs the scheduling cost function under FHE using Zama.
• The evaluation returns encrypted assignment decisions.

5. Decision decryption & enforcement

• Depending on privacy model:

  • Designated decryptor model: a trusted operator key (or multi-party threshold) decrypts assignments, and nodes enforce the decisions.
  • Zero-knowledge reveal model: only minimal metadata (e.g., which node will run replica) is revealed to relevant parties.

• Veil Node pulls images and invokes local container runtime to start the container.

6. Anchor deployment on-chain

• Nodes optionally post a deployment transaction to the contract with a hash/commitment of the assignment and metadata.
• This allows auditing and dispute resolution while keeping raw telemetry private.

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Example configuration snippets

Environment variables (example)

# Veil node config
VEIL_CONTRACT_ADDRESS=0xAbC...123
VEIL_LIBP2P_BOOTSTRAP=/ip4/1.2.3.4/tcp/4001/p2p/QmBootstrap
VEIL_ZAMA_PUBLICKEY_FILE=/etc/veil/zama_pubkey.bin
VEIL_NODE_PEERID=Qm...
VEIL_DOCKER_SOCKET=/var/run/docker.sock

Smart contract: basic interface (pseudo ABI)

interface IVeilRegistry {
  function registerNode(bytes32 peerID, address operator) external;
  function anchorDeployment(bytes32 assignmentHash) external returns (bool);
  function getClusterPolicy() external view returns (bytes memory);
}

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Notes on threat model & privacy choices

• FHE guarantees: Computations on telemetry remain ciphertext-only to nodes performing the computation. The final model depends on who holds decryption keys.
• Key management: Consider multi-party threshold decryption or secure enclaves to reduce trusted parties.
• Attestation: Use libp2p peerIDs and on-chain anchors to attest to node identities and state.
• Auditability: Put compact commitments on-chain (hashes) rather than raw telemetry to preserve privacy while enabling transparency.

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Extensions & TODO

• Add merkle commitments for container image manifests and anchor them on-chain.
• Add an optional state-channel layer for high-frequency scheduling updates.
• Implement multiple scheduling policies (priority round-robin, bin-packing under FHE, cost-minimization for latency-sensitive tasks).
• Provide a reference configuration for threshold FHE decryption (MPC + Zama bridge).

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Appendix: Quick start pointers

1. Deploy the Veil Registry contract to your EVM chain and note the address.
2. Configure a small 3-node mesh with libp2p bootstrap peers and place Zama public keys on each node.
3. Launch nodes pointing to the contract address and register peers on-chain.
4. Start encrypted telemetry gossip and run the reference FHE scheduling example.