⚡ FuseMixer — First x402 Fuse Mixer on Solana

“Obfuscation is not chaos — it’s order you can’t predict.”

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🧬 What is VantaX402?

Fuse Mixer X402 is a simulated fair-exchange fuse mixer, built on the conceptual framework of
the x402 protocol — a payment-required system where commitments and settlements form a
trust-minimized flow: Commit → Delay → Reveal → Settle.

This project showcases how anonymity, fairness, and cryptographic accountability can coexist
inside a deterministic simulation — without relying on blockchain execution. It’s a
visual, interactive demo that brings abstract cryptographic rituals to life.

Key idea:

You can destroy a route — but still prove it existed.

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🧠 Concept Summary

Term	Meaning
Deal	A single simulated mixing session
Hop	A burner address in the route chain
Window	Time window for delay + random jitter
PoRD	Proof of Route Destruction — signed JSON artifact
x420	Fair-exchange principle: payment and proof are linked
Fuse Mode	Burners drain & close after reveal, ensuring unlinkability

The demo implements an off-chain simulation of these flows for visualization and UX
testing. All data is ephemeral and stored only in memory.

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💡 Features

✨ Simulated commit/delay/reveal chain
🔐 ed25519 PoRD signing and verification
🌀 Jitter-based time windows (Instant / 1h / 6h)
🧾 Local proof validation (CLI / browser)
🖥️ Real-time state console
🧩 Configurable hop routes, denominations & decoys
🚫 No persistent logs or storage — pure in-memory demo

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🏗️ Architecture

/apps
  /web        → Next.js interface (mix form, console, PoRD viewer)
/packages
  /core       → state machine, PoRD generator, route simulator
  /api        → REST/WebSocket backend
  /verifier   → CLI for PoRD verification
  /crypto     → ed25519 signing + SHA-256 hashing
  /ui         → design system (cards, console, dark/light theme)
  /types      → shared Zod schemas & TS types
  /adapters
     /adapter-sim           → off-chain simulator
     /adapter-solana-devnet → future devnet stub
/spec
  SPEC.md     → detailed protocol spec
/secrets
  demo_ed25519.json (ignored by git)

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🚀 Quick Start

git clone https://github.com/yourname/fusemixer402.git
cd fusemixer402
pnpm install
pnpm dev

Then open 👉 http://localhost:3000

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⚙️ Example Config (config.demo.yaml)

tokenType: "SOL:demo"
minAmount: 1.0
windows:
  - id: "Instant"
    jitterPct: 0
  - id: "1h"
    jitterPct: 10
  - id: "6h"
    jitterPct: 12
hops:
  recommended: 3
  max: 7
fees:
  mode: "demo"
receipt:
  signer: "VantaX402-demo"
  alg: "ed25519"
logging:
  persist: false

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🧩 REST API

Method	Endpoint	Description
POST	/api/deals	Create new deal
POST	/api/deals/{id}/start	Run Commit→Reveal simulation
GET	/api/deals/{id}	Get deal state
GET	/api/deals/{id}/receipt	Download PoRD.json
POST	/api/verify	Verify PoRD validity

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🧠 State Machine Flow

NEW → DEAL_CREATED → COMMIT_DONE
→ WAITING_WINDOW → REVEALING_HOPS
→ BURNERS_CLOSED → SETTLED → RECEIPT_ISSUED

Each transition logs to a live in-browser console.
Final step generates the PoRD — signed with ed25519.

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🔏 Example PoRD v0

{
  "deal_id": "dl_402xv",
  "network": "solana-mainnet (demo)",
  "amount": "1.000",
  "target": "9cVx…Hf",
  "commit": { "route_hash": "hex", "salt_hash": "hex" },
  "reveal": { "hops": ["..."], "delay_actual": "59m02s" },
  "flags": { "burners_closed": true },
  "signatures": [
    { "by": "fusemixer402-demo", "alg": "ed25519", "sig": "base64" }
  ],
  "disclaimer": "Demo-only proof. Unlinkability is probabilistic."
}

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🧮 Verify Locally

pnpm verifier ./PoRD.json

The verifier checks:

• route/salt hash integrity
• signature validity
• hop & window policy compliance

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🧰 Tech Stack

Layer	Stack
Frontend	Next.js, React, Tailwind, TypeScript
Backend	Node.js, Fastify (REST + WS)
Core	TypeScript, Zod, State Machine
Crypto	TweetNaCl.js (ed25519), SHA-256
Build	Turborepo + pnpm workspaces

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🎯 Demo Goals

✅ Visualize the x402 fair-exchange flow
✅ Generate & sign PoRD proofs
✅ Verify proofs locally
✅ Provide a frictionless UX with no on-chain dependencies

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🧩 Roadmap

• M1 (Demo α) — Simulation, PoRD, local verification
• M2 (Devnet PoC) — PDA-based deal anchor, slot deadlines
• M3 (MVP) — Fee calculator, public verifier CLI, audit prep

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⚖️ License

MIT © 2025 x402 Fuse Mixer Built with ☕, entropy, and degen engineering spirit.

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“History can’t be erased — but routes can be destroyed.”