# 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.

## Request Lifecycle ``` Request → Routing → Execution → Proof → Settlement ``` ## Proof of Token Usage (PoTU) 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) 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 | Proof | Measures | Drives | | ----- | ------------------ | --------------------------------- | | PoTU | Who consumed what | Revenue attribution, settlement | | PoLP | How well delivered | Routing priority, quality bonuses |
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