PennApps 2025

University of Pennsylvania

← Back to Home

Competition Overview

  • Placement: 1st of 85 teams in Bloomberg Sustainability track.

Project Links

View the Devpost submission

View the GitHub repository

Technologies Used

  • Next.js
  • React
  • Auth0
  • FastAPI
  • Web3.py
  • MongoDB Atlas

Details

CarbonChain was built around a simple problem: consumer-facing carbon offset programs often hide where money goes, making it hard to trust that purchases are actually funding meaningful climate impact. That creates room for double crediting, greenwashing, and bureaucratic friction for cities, companies, and individuals trying to support real projects.

We approached that as an operating system for sustainable development powered by blockchain. Buyers can pick a carbon project directly, while the platform mints proof-of-impact certificates that are immutable and transparent. The MVP runs on a testnet demo, which keeps the system safe for experimentation while still demonstrating how milestone-based smart contracts, verifiable project data, and public transaction history can improve trust, traceability, and adoption.

They gave us a cool little golden computer trophy!
Carbon project selection and funding flow
Sam slept in a cardboard box beneath this table for 2 nights