# Introduction

### What is the KRNL Protocol?

A plug-and-play protocol that extends smart contracts with secure access to external APIs, AI systems, and blockchain data. Each step is cryptographically signed, timestamped, and verifiable on-chain through a decentralized orchestration layer without trust assumptions required.

### Why does it matter?

Smart contracts live in a closed box: they can’t fetch live data, call an API, or run heavy computation without relying on unverified off-chain actors.

The KRNL Protocol changes that. It executes external tasks off-chain as part of a verifiable workflow, cryptographically signs each step, and returns a receipt along with the data source’s response (API, other contracts, etc.) to your smart contract, allowing it to verify authenticity before any state change occurs.

### What you can build?

As a flexible middleware, **KRNL** can power a wide range of use cases, a small subset of which are listed below:

* DeFi oracle – A lending contract fetches a real-time stock price; KRNL returns the number plus a signed proof, so the contract can liquidate automatically without trusting the data source.
* NFT loot-box – A game mint needs verifiable randomness; KRNL runs the RNG off-chain, attaches a cryptographic ticket, and the contract opens the box only if the ticket checks out.
* AI credit score – A DAO wants to underwrite loans using an ML model; KRNL scores the wallet off-chain, signs the result, and the contract sets the interest rate on-chain.
* Cross-chain swap – User wants ETH → SOL; KRNL watches both chains, produces a single signed proof when the ETH is locked, and the Solana contract releases the tokens.
* Carbon offset – A company pays per ton of CO₂; KRNL calls an emissions API, signs the reading, and the contract auto-mints the exact number of offset NFTs.

### Need Help? <a href="#need-help" id="need-help"></a>

If you feel stuck somewhere, or if you have any feedback or even if you want to say hello, you can reach out to Discord:

* Join the [KRNL Discord Server](https://discord.gg/krnl-labs).

### What's next?

{% content-ref url="getting-started-with-krnl" %}
[getting-started-with-krnl](https://docs.krnl.xyz/getting-started/getting-started-with-krnl)
{% endcontent-ref %}