39 lines
2.0 KiB
Markdown
39 lines
2.0 KiB
Markdown
Status: done
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# 04 — H2: Tracker-authoritative token and work-unit accounting
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## What to build
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Stop trusting node-reported usage for billing. The tracker already proxies responses — use tracker-observed response data and request limits to cap billable tokens, and compute work units from the **route it constructed**, not node declarations.
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**Code refs:**
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- `packages/tracker/meshnet_tracker/server.py` — `node_work` from route construction (~1776–1782, ~1781–1782)
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- `packages/tracker/meshnet_tracker/server.py` — streaming token/chunk billing (~1890–1921)
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- `packages/tracker/meshnet_tracker/server.py` — non-streaming `_usage_total_tokens` (~1938–1943)
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- `packages/tracker/meshnet_tracker/billing.py` — `charge_request` node_work split (~104–151)
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Accounting fraud = inflating tokens or shard span. Per ADR-0018 §5.
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## Test-first
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1. Red: mock upstream returns inflated `usage.total_tokens` in body but tracker bills that value — test expects the tracker to cap billable tokens from observed stream chunks or request bounds.
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2. Red: node registers false `shard_end`; billing uses tracker route span, not registration field alone.
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3. Green: authoritative counters; ignore node-reported work units on charge path.
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## Acceptance criteria
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- [ ] Streaming token count uses tracker-observed chunks/tokens; upstream `usage.total_tokens` can only lower or match that observed count, never inflate it
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- [ ] Non-streaming token count caps upstream `usage.total_tokens` by tracker-known request bounds (`max_tokens`, and prompt estimate if available); exact tokenizer-backed counts are deferred unless already available locally
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- [ ] Work units = tracker-computed layer span per hop at route build time (~1781–1782)
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- [ ] Nodes cannot increase payout by lying about shard range mid-request
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- [ ] Integration test: malicious node metadata does not inflate `charge_request` shares
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## ADR links
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- [ADR-0018](../../docs/adr/0018-fraud-detection-verification-and-reputation.md) §5
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## Blocked by
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- `02-a2-unified-auth-boundary_completed.md`
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