Name	Name	Last commit message	Last commit date
parent directory ..
public	public
src	src
.env.example	.env.example
.gitignore	.gitignore
README.md	README.md
eslint.config.js	eslint.config.js
index.html	index.html
package-lock.json	package-lock.json
package.json	package.json
tsconfig.app.json	tsconfig.app.json
tsconfig.json	tsconfig.json
tsconfig.node.json	tsconfig.node.json
vite.config.ts	vite.config.ts

Name

Last commit message

Last commit date

Opaque Cash — Frontend

Minimalist stealth address wallet UI: key setup, send to stealth meta-addresses, and private balance (with indexer status).

Stack

Vite + React + TypeScript
Tailwind CSS (v4) — dark glassmorphism theme
viem — wallet connection, signing, transactions
@noble/curves (secp256k1) + @noble/hashes — client-side stealth address crypto (EIP-5564 / DKSAP)

npm install
cp .env.example .env   # optional: set VITE_ANNOUNCER_ADDRESS and chain
npm run dev

VITE_ANNOUNCER_ADDRESS — EIP-5564 StealthAddressAnnouncer contract address (default placeholder).

Setup — Sign a message with MetaMask/Rainbow; signature is used as entropy to derive viewing and spending keys. Displays your Stealth Meta-Address (V ‖ S) to share for receiving.
Send — Enter recipient stealth meta-address and amount. Client derives ephemeral key, stealth address P, and view tag; sends ETH to P and calls the Announcer in two transactions.
Private balance — Placeholder list of “found” stealth txs and a scanning progress indicator; wire to your Rust indexer API when ready.

Keys: HKDF-SHA256(signature, domain "opaque-cash-v1") → 64 bytes → viewing key (32) ‖ spending key (32).
Stealth meta-address: compressed(V) ‖ compressed(S) (66 bytes).
Send flow: ephemeral (r, R), shared secret r·P_view, s_h = Keccak256(shared), viewTag = s_h[0], P_stealth = P_spend + s_h·G, address = last 20 bytes of Keccak256(uncompressed(P_stealth)). Matches the scanner crate logic.

npm run build
npm run preview