Architecture

Plata Mia is built from four components that work together. As a user, you interact with the web app — the other three run behind the scenes to handle cryptography, on-chain storage, and private announcement delivery.

Components

Web App

The interface you see and use. It handles connecting your wallet, registering your stealth keys, sending payments, and scanning for received funds. Built with Next.js and React.

Stealth Core

A cryptography library that runs in your browser. It generates your key pairs, derives one-time stealth addresses when you send payments, and scans announcements to detect payments addressed to you. You never interact with it directly — the web app calls it automatically.

Registry Contract

A smart contract on Polkadot Asset Hub that stores public keys. When you register with a hint like "alice," your two public keys are saved on-chain so anyone can look them up. The hint itself is hashed before storage — the plain text never appears on-chain.

Announcement Proxy

An HTTP service that connects to the xx network, a mixnet that strips metadata (like IP addresses) from messages. After sending a payment, the app publishes a small announcement through this proxy. The mixnet ensures that the announcement can't be traced back to you.

How They Connect

Registration: The web app generates your key pairs using stealth core, then writes them to the registry contract on-chain.

Sending: The web app looks up the recipient's public keys from the registry contract, derives a one-time stealth address using stealth core, sends funds on-chain, and publishes an announcement through the proxy.

Receiving: The web app fetches announcements from the proxy, scans them with stealth core to find payments addressed to you, and displays the results with balances.