Prerequisites

Using the App

To deploy and participate in circles on app.kosh.finance, you only need:

Chrome + Lace Midnight Extension

Kosh runs entirely in the browser via the Lace Midnight wallet extension.

1. Install Lace from the Chrome Web Store
2. Open Lace → switch to the Midnight tab
3. Set network to Preprod
4. Fund your wallet with test NIGHT and DUST from the Midnight faucet

Preprod network

Kosh is deployed on Midnight's public preprod testnet. Lace must be on the "Preprod" network — not "Preview" or "Undeployed" (which is for local Docker dev only).

Brave browser

If using Brave, disable shields for app.kosh.finance — Brave's aggressive content blocking can prevent extension injection.

No Docker, no Node.js, and no local setup are needed to use the live app.

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Local Contract Development

To modify the Compact contract or run tests locally, you additionally need:

Docker

The Midnight local dev network runs in Docker containers.

• Linux: curl -fsSL https://get.docker.com | sh
• macOS/Windows: Docker Desktop

Verify: docker --version (need 24+)

Node.js 20+

node --version  # should be v20+
npm --version

Compact Compiler

Compiles .compact contracts to ZK circuit keys.

curl --proto '=https' --tlsv1.2 -LsSf \
  https://github.com/midnightntwrk/compact/releases/latest/download/compact-installer.sh | sh
source ~/.bashrc   # or ~/.zshrc
compact --version

Lace on "Undeployed" network

For local dev, set Lace to the "Undeployed" network so it targets localhost.

Compatibility

Platform	Support
Chrome / Chromium	Full support
Brave (shields off)	Full support
Firefox	Not supported (Lace Midnight is Chrome-only)
Linux / macOS / Windows (WSL2)	Local dev supported