The problem Sentinel Protocol solves

Parametric flight delay insurance, fully on-chain.

A traveler buys a policy for a specific flight. If that flight is delayed beyond a threshold or cancelled, they receive an automatic payout — no claim forms, no manual review, no adjuster. The contract decides and pays out by itself.

The problem with existing travel insurance:

• Claims are manual, slow, and frequently disputed
• Insurers hold float for weeks while processing
• Travelers often don't bother claiming small delays
• No transparency into how payouts are calculated

What this protocol does differently:

• Policy terms are fixed in the smart contract at purchase time
• A decentralized oracle network feeds real flight data on-chain
• Payouts trigger automatically when the data conditions are met
• Capital is pooled by underwriters, not held by a single insurer

Challenges I ran into

I had 2 issues -

1. working with pure solidity with HTS is hard , but I did my best doing HTS native erc20 - https://github.com/enderNakamoto/flight_hedera/blob/main/contracts/src/MockUSDC.sol

2. I had issues with verifying some of the contracts

Use of AI tools and agents

I used claude code and cursor a lot to code/think/design