Velocity

Display of Unauthorized Regions With Drone Locations
A transaction being processed in the blockchain by our program
information about our program in the blockchain
Smart Contracts being processed real-time by our program

Inspiration

We wanted to solve a real-world infrastructure problem with blockchain instead of another DeFi or NFT project

What it does

Velocity is a decentralized airspace registry on Solana. Verified government authorities create, update, and delete no-fly zones, each stored as a polygon with GPS coordinates. The data is public and permissionless to read, so any device or app can query the blockchain and know exactly where flight is restricted, with a full audit trail of who created each zone and when

How we built it

Backend is purely on-chain with Anchor/Rust. Frontend is React(typescript) with @solana/wallet-adapter. We used Leaflet to draw polygon zones on a map.

Challenges we ran into

Anchor macros like #[account], has_one, and init_if_needed don't play well with Rust LSP tooling. no autocomplete, no inline errors, just red squiggles everywhere. We were essentially coding blind and relying on anchor build to catch mistakes when we build it.

Accomplishments that we're proud of

None of us had written a Solana program before this. Going from zero to a deployed, access-controlled, on-chain registry in a weekend felt huge

What we learned

Solana's security model is fundamentally different from traditional backends. There's no middleware, no auth layer, every permission check has to be baked into account constraints. If you forget a check, anyone can call your instruction

What's next for Velocity

Real-time drone integration , a lightweight SDK that drones can query on-chain to check if their GPS coordinates fall inside any active no-fly zone polygon