👩‍⚖️ For Judges (start here)

What it is: A did:t3n autonomous escrow agent. A client funds a milestone, then both freelancer and client sign cryptographic attestations. When both match (or a deadline/arbiter rule fires), a Rust ➔ WASM contract automatically releases the payout. No single party—not even Escrowa itself—can move the funds unilaterally.

🔗 Quick Links

• 🎬 Demo Video: youtu.be/WzEVJwG1ebQ
• 🚀 Live Demo Console: escrowa.edycu.dev
• 🏆 DoraHacks BUIDL Page: dorahacks.io/buidl/44352

🎯 Bounty Tracks Targeted

• 🥇 Best Agent Auth SDK ($300) (Primary): A production-ready least-privilege agent-auth implementation.
• 🐞 Bug & Documentation Bounty ($200): Real ADK developer feedback detailed in BUGS.md.

⚡ Verify in ~60 Seconds

cd contract && cargo test          # Run 18 Rust contract state tests
cd ../board && npm run ci          # Run ESLint, typecheck & 73 Vitest tests (100% coverage)
npm run e2e                        # Run 10 Playwright E2E tests (auto-starts dev server)
npm run dev                        # Launch local dev server at http://localhost:3000

🔍 Where the Substance Is

Core Concern	Technical Implementation / File Reference
Agent-Auth Enforcement	Scoped functions + allowedHosts allowlist configured in agentAuth.ts and enforced natively via T3nClient.ts
Escrow State Machine	Core dual-consent, deadline, and arbiter logic written in Rust in lib.rs
Decentralized Identity	Identity resolution and mapping configured in didRegistry.ts
Comprehensive Test Suite	91 total tests (73 Vitest frontend tests + 18 Cargo contract tests)
Documentation & Playbook	Walkthrough playbook in DEMO.md and architecture layout in ARCHITECTURE.md

Important

Honest Hackathon Scope & Simulation Context: The Rust ➔ WASM contract logic and secp256k1 cryptographic signatures are real. The TEE enclave, host interfaces, and blockchain settlement are locally simulated using the T3 Agent Development Kit (ADK) and @bytecodealliance/jco. This architecture is production-ready for real Intel TDX hardware when the T3N mainnet launches. Full details are in the Hackathon Simulation Context section below.

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Escrowa 🔲

Get paid the moment the work is done — TEE-secured autonomous escrow agent.

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🎬 See it in Action

The Flow: Priya delivers the milestone ➔ signs a cryptographic attestation ➔ client approves ➔ TEE enclave verifies signatures and triggers the in-enclave signing key to sign the payout ➔ outbox delivers the payout idempotently.

The three control paths

✅ Mutual release (m1)	⏰ Deadline fallback (m2)	⚖️ Arbiter refund (m3)
Both parties attest → released	Client ghosts → auto-release at deadline	Disputed → arbiter refunds the client

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💡 The Problem & Solution

The Problem

Priya shipped the final milestone of a 6-week remote development contract. The client said "looks great," went silent, and she's still chasing $4,200 three months later. Traditional escrow requires trusting a third-party custodian with both the funds and the release decision. On-chain escrow usually means trusting a hot wallet or an opaque, unverified smart contract. No platform offers a neutral, secure environment that releases payment only when both sides agree without exposing the private keys to any single human or software agent.

The Solution

Escrowa is an autonomous escrow agent. The funds are locked under conditional logic compiled for a Trusted Execution Environment (TEE).

• Mutual Consent: Payout occurs automatically when the freelancer's "delivered" and the client's "approved" cryptographic signatures match.
• Hardware-Gated Custody: The signing keys are generated and held inside the enclave under cluster CEK. The agent never sees the raw private keys, preventing unilateral draining of the escrow.
• Fail-Safe Fallbacks: Includes customizable ghost/deadline rules (automatic release if a client vanishes) and arbiter-gated resolution paths.

Note

Hackathon Simulation Context: For this DoraHacks submission, the TEE hardware environment is simulated locally using the T3 Agent Development Kit (ADK) and @bytecodealliance/jco. The core logic (contract/src/lib.rs) compiles to a standard wasm32-wasip2 T3 component, but the host cryptographic functions (like sign-secp256k1) are simulated locally via ethers.js in board/src/wasm/host.ts. This ensures the code is production-ready for real Intel TDX hardware when the T3 network launches, without misleading about current hardware utilization.

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🏗️ Architecture & Flow

flowchart LR
    C[Client] -->|"fund milestone"| ESC
    F[Freelancer] -->|"attest: delivered (sig)"| ESC
    C -->|"attest: approved (sig)"| ESC
    subgraph ESC["Escrowa agent (did:t3n)"]
      API["REST API"]
      CLI["T3nClient.executeAndDecode"]
    end
    subgraph T3["T3N TEE (Intel TDX / Wasmtime)"]
      DISP["escrow contract: dispatch"]
      COND["release conditions"]
      SIGN["signing: per-wallet secp256k1"]
      OUT["outbox: idempotent payout"]
    end
    API --> CLI -->|"execute fn"| DISP --> COND
    COND -->|"delivered AND approved -> sign release"| SIGN --> OUT -->|"tokens -> freelancer"| TX[("settlement")]
    ESC -. "did:t3n" .-> REG["did-registry / agent-registry"]
    OUT --> DASH["Audit dashboard"]

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1. Fund: Client locks test tokens in the contract.
2. Attest: Freelancer signs delivered, client signs approved.
3. Evaluate: Enclave contract verifies signatures against did:t3n registry.
4. Sign & Settle: Enclave signing signs payout; outbox posts it idempotently.

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🏆 Sponsor Tracks Targeted & SDK Surface Area

We use six distinct Terminal 3 host capability interfaces:

1. signing (contract/src/lib.rs:224): Generates secp256k1 signatures for release payouts inside the TEE. Keys never leave the enclave.
2. outbox (contract/src/lib.rs:239): Posts payouts to the settlement system exactly-once (prevents double-spending).
3. kv-store (contract/src/lib.rs:83): Stores namespace-isolated milestone states securely.
4. did-registry & agent-registry (board/src/sdk/didRegistry.ts, wired in board/src/app/api/seed/route.ts): Links each party's authenticator to its did:t3n identity and publishes the Escrowa agent URI.
5. agent-auth (board/src/sdk/agentAuth.ts, enforced in board/src/sdk/T3nClient.ts): Provisions Escrowa a least-privilege scope (allowed functions + allowedHosts egress allowlist) and the host blocks any call outside it — an out-of-scope function fails with host/agent.function_denied and an unauthorized host with host/http.egress_denied.
6. TEE Attestation (Intel TDX): Enforces execution of compiled WASM logic inside hardware-secured VMs.

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🪪 Identities (did:t3n)

The demo provisions these identities via the did-registry / agent-registry (see board/src/app/api/seed/route.ts). DIDs are did:t3n:<authenticator-address>.

Role	Authenticator address	DID
Client	0x1111111111111111111111111111111111111111	did:t3n:0x1111111111111111111111111111111111111111
Freelancer (Priya)	0x2222222222222222222222222222222222222222	did:t3n:0x2222222222222222222222222222222222222222
Arbiter	0x3333333333333333333333333333333333333333	did:t3n:0x3333333333333333333333333333333333333333
Escrowa agent	—	did:t3n:escrowa-agent (URI https://escrowa.edycu.dev/.well-known/agent)

The Escrowa agent is granted a least-privilege agent-auth scope: functions create-milestone, submit-attestation, resolve-milestone; egress allowlist api.terminal3.io (see board/src/sdk/agentAuth.ts).

These are deterministic demo identities for the simulated build. A real deployment would obtain its did:t3n and developer key from the claim page (set as T3N_API_KEY).

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🚀 Getting Started

Prerequisites

• Node.js ≥ 20
• Rust & Cargo (with wasm32-wasip2 target)
• npm

Setup & Installation

1. Clone the repository:

   git clone https://github.com/edycutjong/escrowa.git
   cd escrowa

2. Build the Rust WASM contract:

   cd contract
   rustup target add wasm32-wasip2
   cargo build --target wasm32-wasip2 --release
   cd ..

3. Install frontend dependencies:

   cd board
   npm install

4. Configure the Environment Variables:

   cp .env.example .env.local

   Open .env.local and add your Terminal 3 API Token (claimable here):

   T3_API_KEY=0x_your_terminal3_api_key_here

5. Run the local dev server:

   npm run dev

   Open http://localhost:3000 to view the Escrowa Dashboard.

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🧪 Testing & Verification

We enforce a rigorous test harness verifying the entire escrow state machine.

# Run unit tests
cd board
npm run test

Suite	Focus	Status
Key Custody Test	Asserts that generated keys are restricted to TEE memory and never leak to disk/env/logs	✅ Passing
Happy Path Suite	Verifies create -> attest:delivered -> attest:approved -> released	✅ Passing
Deadline Fallback	Verifies deadline timeout automatically triggers release/refund	✅ Passing
Arbiter Dispute	Verifies arbiter-only decision resolution	✅ Passing
Replay Protection	Asserts duplicate attestation requests are rejected	✅ Passing
Agent-Auth Scope	Asserts out-of-scope functions (host/agent.function_denied) and non-allowlisted egress (host/http.egress_denied) are blocked	✅ Passing

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⚡ Latency Benchmarks

We ran 200 full lifecycle evaluations of our release-condition check, signing, and outbox posting inside the TEE simulator.

Run the benchmarks:

./scripts/bench.py

Results (200 full-lifecycle evals; varies run to run)

• Mean Latency: ~3.4 ms
• p50 (Median): ~2.3 ms
• p95 Latency: ~8.6 ms

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📄 License

MIT © 2026 Edy Cu