Consent Vault

Consent Vault is authorization middleware for AI agents using private data. It combines Aleo private consent records, independent subject and agent accounts, encrypted vault binding, a real local model, MCP integration, persistent policy storage, expiry, and revocation.

Links

• Repository: https://github.com/SU-AN-coder/private-ai-consent-vault

• Live demo: https://private-ai-consent-vault.vercel.app

Related MCP server: Agent Identity MCP Server

Current proof

Stateful Aleo testnet

The primary program is consent_state_0725b.aleo, deployed in accepted transaction at1sq0hacrpuc34meyj3lw7fvgvquek87ya6wsxp3gygtgstpxsncxq86k9gu. It stores canonical consent status, expiry, approved request nullifiers, and revocation hashes in Aleo mappings.

The current independent subject/agent stateful chain includes:

• create_consent: at14hcnrudnw28evqr4aa9qfdzlwq85x6lt7pn0d5qvv7rpll659cxq0gyhmj

• approve_request: at14tj8c7kl63j2q3smeq4f943qmzatf5e6s8q89ergpvl5g4jf2y8q9dg6sv

• separate revoked consent create_consent: at1ld9e7uysmjpyp446p242qmhggr48f8cu6zlkx3qm9unjp8wg2y8qymlnjw

• revoke_with_notice: at1hpzqtw6zyhqee4h4jc5mue83t0lkjv7kaf22gy6n9ef5ng0ngqqspqzfre

The six accepted mapping checks prove active status and expiry, a consumed request nullifier, revoked status and expiry, and the exact revocation hash. The independent agent decrypts and validates the agent-owned AccessGrant; MCP then checks the live mappings before vault decryption. An additional agent-signed, subject-fee-sponsored prove_grant_live transaction is opt-in with CONSENT_RUN_SPONSORED_GRANT_PROOF=true because it is not required for the mapping authorization path.

Run or resume the full active plus revoked mapping lifecycle:

npm run testnet:consent:stateful-chain
npm run testnet:verify-stateful-evidence

The earlier private-record chain on consent_vault_0709.aleo remains accepted legacy evidence:

• create_consent: at12l7a7atfjs8c3n06h479pquvdn74723ylv62e4alklcg6c70esgslh5j67

• approve_request: at15j705he025urctszcnf9zaux9ry8w8vfrykspfw3eg3h6ap2cvyswphejd

• revoke_with_notice: at15pq9pq22dz5vq4xf4332a2sqw6e3ywljypzkzekgqfqyykql0gzqfn4w04

• publish_revocation: at1wrywa0zgxprc2zutx583l5pcqwm5ccszq6rqsjr65ppl2tff858ssqxv8d

The independent agent decrypted its own AccessGrant and verified its owner, subject, agent, receipt commitment, and request hash.

Local private inference

• Real model: onnx-community/Qwen2.5-0.5B-Instruct

• Pinned revision: cc5cc01a65cc3ff17bdb73a7de33d879f62599b0

• Runtime: Transformers.js, CPU, q8

• Remote model loading disabled

• Local files only

• Fetch guard installed before model loading

• Observed network calls during inference: 0

• Raw context forwarded externally: false

• Three-scenario quality gate: 3/3 passed

• Average inference: 2201 ms; maximum: 2390 ms

• Model role: rationale only; deterministic payment control owns severity and action

• Off-topic or unsafe model text is retried once, then withheld

MCP and persistent security

• Stable @modelcontextprotocol/sdk over real stdio client/server

• Tools: consent_vault_policy_status and consent_vault_local_risk_assessment

• Live Aleo create, approve, status, expiry, and request-nullifier checks before vault decryption

• Local Poseidon8 consent-id and Poseidon4 request-nullifier recomputation binds the signed audit bundle to the exact on-chain authorization

• Stable sql.js WASM SQLite registry with atomic snapshot persistence and append-only hash-chain audit

• Cross-platform system keyring through @napi-rs/keyring: Windows Credential Manager, macOS Keychain, or Linux Secret Service

• Explicit scrypt passphrase backend for headless deployments

• One-time migration of legacy Windows DPAPI envelopes into the system keyring

• AES-256-GCM encryption for vault passphrases

• Policy and secret recovery verified after two MCP server processes

• Wrong-passphrase, ciphertext, audit tamper, and legacy migration tests pass

• No node:sqlite runtime or experimental warning

Commands

From this repository root:

npm install
npm run model:prepare
npm run model:quality:verify
npm run keyring:verify
npm test
npm run build
npm run mcp:serve

Run the MCP server directly after configuring its database, protected-key, and model-cache paths:

npm run mcp:serve

The external provider path remains available only for an explicitly approved disclosure workflow:

npm run agent:authorized

It is not the primary private-inference claim.

Evidence

• docs/evidence/independent-subject-agent-testnet-chain.json

• docs/evidence/stateful-consent-deployment.json

• docs/evidence/stateful-consent-testnet-chain.json

• docs/evidence/local-private-inference.json

• docs/evidence/local-model-quality.json

• docs/evidence/mcp-local-private-inference.json

• docs/evidence/system-keyring.json

• docs/evidence/deepseek-authorized-context.json

No evidence file contains private keys, vault passphrases, vault ciphertexts, private record plaintext, or private input context.

Security boundary

The completed proof uses Aleo testnet, a local CPU model, stable SQLite, and an OS keyring. The current machine verifies Windows Credential Manager; the native keyring library also implements macOS Keychain and Linux Secret Service. Mainnet deployment, secure-enclave inference, cloud KMS/HSM integration, organization-wide policy administration, and hosted enterprise vaults are not claimed.