Acre Labs

Proof-of-attendance NFTs on Avalanche. An organizer creates a drop with a claim code and a picture; attendees enter the code and the NFT lands in their wallet. No forms, no middlemen.

How it works

1. Create — an organizer sets up a drop: title, image, location, event end time, an optional max supply, and a 6-digit secret code.
2. Claim — attendees visit the drop's claim link and enter the code within the claim window (24 hours after the event ends). One claim per wallet, enforced at the database level.
3. Collect — the claim is minted from Acre Labs' shared ERC-721 contract on Avalanche and shows up in the attendee's collection.

Stack

• Next.js 16 (App Router) + React 19
• Prisma 7 with the Postgres driver adapter
• Privy for wallet auth
• ethers.js for contract calls against Avalanche Fuji (testnet) / C-Chain (mainnet)
• Tailwind CSS 4

This repo runs Next.js 16, which has meaningfully diverged from older Next.js conventions. Check node_modules/next/dist/docs/ before assuming an API or file convention still applies.

Getting started

Install dependencies (this also generates the Prisma client via postinstall):

npm install

Create a .env.local with:

Variable	Purpose
DATABASE_URL	Postgres connection string (used by Prisma Client at runtime)
NEXT_PUBLIC_PRIVY_APP_ID	Privy app ID for wallet auth
SESSION_SECRET	Secret used to sign the auth session cookie
VOUCHER_SIGNER_PRIVATE_KEY	Private key that signs claim vouchers server-side
NEXT_PUBLIC_AVALANCHE_NETWORK	mainnet to claim against Avalanche C-Chain; defaults to Fuji testnet
NEXT_PUBLIC_DROP_CONTRACT_ADDRESS	Address of the shared drop ERC-721 contract

Run the database migrations, then start the dev server:

npm run db:migrate
npm run dev

Open http://localhost:3000.

Scripts

Command	Description
npm run dev	Start the dev server
npm run build	Production build
npm run start	Serve the production build
npm run lint	Run ESLint
npm run db:migrate	Apply Prisma migrations
npm run db:studio	Open Prisma Studio

Project layout

• app/create — organizer flow for setting up a drop
• app/drop/[slug] — public drop page
• app/claim/[eventId] — code-entry claim flow
• app/collection/[txHash] — a claimed NFT's confirmation page
• app/profile/[address] — a wallet's claimed collection
• app/api — auth, claims, events, collectors, and metadata routes
• lib/web3 — chain config, voucher signing, mint verification
• prisma/schema.prisma — Event and Claim models