> ## Documentation Index
> Fetch the complete documentation index at: https://docs.theblockchainlibrary.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Topic objects

> Structure and purpose of canonical topic objects in The Blockchain Library Knowledge Engine.

## Topic object

Each major subject has a stable `id` that should remain consistent even when page titles, descriptions, or URLs evolve.

```json theme={null}
{
  "id": "smart-contracts",
  "title": "Smart Contracts",
  "slug": "smart-contracts",
  "summary": "Programs deployed to blockchain-compatible execution environments...",
  "level": "intermediate",
  "hub": "/topics/smart-contracts",
  "primaryPage": "/learn/foundations/smart-contracts",
  "relatedTopics": ["blockchain", "wallets-security", "defi"],
  "tags": ["smart-contracts", "execution", "dapps"]
}
```

## Design rules

* IDs use lowercase kebab-case.
* IDs are stable identifiers, not display labels.
* A topic should have one canonical hub.
* Relationships use topic IDs rather than copied titles.
* Resource arrays contain public documentation paths.
* Tags support future search, filtering, and classification.

## Current topic set

The initial engine includes Blockchain, Cryptocurrency, Wallets & Security, Smart Contracts, DeFi, Web3, Blockchain Infrastructure, Enterprise Blockchain, and AI + Blockchain.