> For the complete documentation index, see [llms.txt](https://docs.world3.ai/world3/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.world3.ai/world3/routerlink-litepaper/6.-proof-based-routing-potu-and-polp.md).

# 6. Proof-Based Routing: PoTU and PoLP

RouterLink is built on a proof-based routing system that connects execution, performance evaluation, and economic settlement into a single verifiable flow.

<figure><img src="/files/8ZYa0HmulNeNxpCoADDJ" alt=""><figcaption><p>PoTU and PoLP Mechanism</p></figcaption></figure>

## Request Lifecycle <a href="#request-lifecycle" id="request-lifecycle"></a>

```
Request → Routing → Execution → Proof → Settlement
```

## Proof of Token Usage (PoTU) <a href="#proof-of-token-usage-potu" id="proof-of-token-usage-potu"></a>

PoTU measures AI usage at the protocol level. Each routed request generates a **signed usage receipt** recording:

* Request and routing path
* Service endpoint involved
* Usage metrics relevant to billing

**PoTU ensures:** Usage cannot be fabricated, settlement is verifiable, disputes resolved against signed receipts.

## Proof of LLM Performance (PoLP) <a href="#proof-of-llm-performance-polp" id="proof-of-llm-performance-polp"></a>

PoLP measures **how well** services perform through **cross-node observation**, not unilateral reporting. Metrics include latency, availability, stability, and error patterns.**No single node defines performance.** Aggregated observations determine routing priority and reward weighting.

## Proof-Driven Economics <a href="#proof-driven-economics" id="proof-driven-economics"></a>

| Proof | Measures           | Drives                            |
| ----- | ------------------ | --------------------------------- |
| PoTU  | Who consumed what  | Revenue attribution, settlement   |
| PoLP  | How well delivered | Routing priority, quality bonuses |

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