# Builder Guides

URL: https://docs.nexart.io/docs/guides

Quick-start paths for common NexArt tasks: verify a CER, verify a Project Bundle, register with the node, browser-safe flows.

## Verify a CER

Node / server

```
import { verifyCer } from "@nexart/ai-execution";

const result = verifyCer(cerBundle);

if (result.status === "VERIFIED") {
  // CER is intact
}

// Or verify by certificateHash at:
// https://verify.nexart.io/c/sha256%3A...
```

## Verify a Project Bundle

Node / server

```
import { verifyProjectBundle } from "@nexart/ai-execution";

const result = verifyProjectBundle(projectBundle);

// result.status: "VERIFIED" | "FAILED"
// result.steps: per-step verification results

// Or verify at:
// https://verify.nexart.io/p/sha256%3A...
```

## Use Browser-Safe Verification

Browser / Edge

```
import { verifyCerAsync } from "@nexart/ai-execution";

const result = await verifyCerAsync(cerBundle);

// Same result shape as verifyCer()
// Uses Web Crypto API, no Node.js dependencies
```

See Browser Verification for a full example with Project Bundles.

## Register a Project Bundle with the Node

Register a Project Bundle

```
POST /v1/project-bundle/register
Authorization: Bearer NEXART_API_KEY
Content-Type: application/json

{
  "bundleType": "cer.project.v1",
  "metadata": {
    "projectId": "proj_abc123",
    "description": "Contract review pipeline"
  },
  "steps": [
    { "stepIndex": 0, "cer": { ... } },
    { "stepIndex": 1, "parentRef": "sha256:...", "cer": { ... } }
  ]
}
```

The node computes the `projectHash`, signs a project-level receipt, and returns a verification URL at `/p/:projectHash`.