ProofChain

Hate-crime victims and witnesses often don't report, because they distrust centralised systems and fear evidence will be tampered with.

Blockchain & backend developer · 48h

• Hashed evidence client-side, so plaintext never touches an intermediary server.
• Anchored SHA-256 hashes in Algorand transaction notes for permanent timestamps with about 3.3s finality.
• Cut scope hard to the core trust mechanics so the demo would actually work in 48 hours.

→A complete end-to-end prototype in 48 hours with no prior Algorand experience, praised by judges for scope control.