The problem ICE Alert solves

ICE Alert

Censorship-resistant, anonymous community reporting for ICE activity — powered by Hedera Consensus Service.

The Problem

When communities need to warn each other about ICE enforcement activity, they rely on apps, social media, and group chats. But those platforms can be taken down, pressured, or censored — exactly when they're needed most.

A centralized server can be seized. A social media account can be banned. A database can be wiped.

What if the data couldn't be deleted by anyone?

The Solution

ICE Alert stores every report on the Hedera Consensus Service (HCS) — an immutable, decentralized ledger. Once a report is submitted, no government, company, or admin can remove it. Not even us.

• No accounts. No logins. No tracking.
• Reports are permanent, timestamped, and publicly verifiable.
• The app can go offline. The data lives forever on Hedera.

How It Works

User submits report → Next.js API → Hedera SDK → HCS Topic (immutable ledger)
                                                        ↓
                              Map auto-refreshes ← Mirror Node API

1. Drop a pin on the interactive map (or use your location)
2. Choose a report type: ICE Sighting or All Clear
3. Submit anonymously — transaction confirmed on Hedera in ~15 seconds
4. Watch the map update — all users see the new marker within 30 seconds

Features

Challenges I ran into

Challenges

• Complete blockchain beginner — had never touched Hedera or any SDK before this hackathon
• Private key format hell — Hedera keys come in three formats (DER, ED25519, ECDSA); the SDK silently misparsed the wrong one, causing transactions to fail with no clear error
• Mirror Node decoding — messages come back from Hedera base64-encoded; took a while to realize the data wasn't corrupted, just encoded
• The controversy — ICE Alert is deliberately political. Not everyone will agree with what this tool is for. But that's exactly the point: censorship-resistance only matters when the speech is controversial. A tool that only protects popular speech isn't protecting anything.

Use of AI tools and agents

Why Hedera?

Most blockchains are too slow or expensive for high-frequency community reporting. Hedera Consensus Service gives us:

• ~3–5 second finality — fast enough for real-time alerts
• Extremely low fees — fractions of a cent per message
• No mining / PoW — energy efficient and predictable
• Immutability — messages on an HCS topic cannot be altered

The data layer is fully decentralized. The frontend is just a lens.

Tech Stack