We just open-sourced ai2human Onus: the first verification layer where the evidence can veto the model.
A model will happily tell you a forged screenshot is real, with 0.99 confidence.
Onus says no. Every piece of evidence gets a grade, E0–E4, by how hard it is to fake, and a low grade can never auto-approve, whatever the model says.
You run a giveaway: "Reply to our post, get $1."
Overnight: 1,000 replies. Half are "gm", ads, bots, copy-paste.
An LLM review is slow and pricey. Doing it by hand takes all day.
That is the gap Onus fills. One rule behind it:
The burden of proof is on the evidence. 🧵
1. Evidence grades, not just scores
E0–E4 by how hard the evidence is to fake. A screenshot never auto-passes, even at 0.99. That rule lives in code; the model cannot override it.
2. Code checks what code can
Task code present? Duplicate? Empty claim? Code decides first. The model answers only what it is good at: does the content meet the requirement.
3. The model scores, code controls the money
Judgment and payout are fully separated. The bar rises with the value at stake.
4. The weakest link decides
Criteria combine by minimum, not average. A 0.95 "relevant" cannot hide a 0.2 "genuine".
5. Every verdict is replayable
Each result ships a receipt: evidence grade, pinned model version, full probabilities, hash.
6. Measured on live Jev, not estimated
0.4s per check, ~$0.02 per 1,000, all 5 off-topic submissions caught.
The one to look at: across 30 cases the model alone let 1 forgery through. With the grade gate, 0. That forgery scored 0.90.
7. No vendor lock-in
Jev, open-source kev, or your own model, one setting. MCP-native, callable from Claude and Codex, batch mode built in.
8. Early, come break it
Known limits are listed in the README. Fool it, tell me, and I will fix it and credit you publicly.
If you know another project that grades evidence and lets it veto the model, reply with the link. I will credit you and add it to the README.
Free and open source, MIT 👉
github.com/richard7463/a2h-o…
Star it if you want this to keep getting better.
#Jev #AIAgents #MCP #OpenSource #BuildInPublic