01 / 05
A median rejects one extreme voice.
Sort [99, 100, 100, 101, 160]. The middle value remains 100 even though the mean rises to 112. Robust aggregation limits one outlier; it does not prove the report is true.
When five voices share one mistake.
Predict the on-chain price. Inject a fault. Follow the exact consequence into a lending contract.
3D view unavailable.
The live report strip, formulas, explanations, and lesson controls remain fully usable.
Five independent reports online
Mean100.00
Median100.00
Fresh quorum5 / 5
ContractSAFE
Truth is a dependency graph.
Providers → nodes → median → on-chain rule
Count reports.
Then count dependencies.
03 → 01
Node count can hide shared origins.
Three nodes may repeat the same compromised provider or upstream market. Correlated reports are not independent evidence, so they can dominate the middle of the sorted set.
t ≤ 60s
Freshness changes the quorum.
A stale honest report should not vote forever. Filtering it is necessary, but doing so can leave correlated fresh reports in control. Freshness and independence solve different failure modes.
Design for the failure you cannot average away.
Your production feed faces shared upstreams and stale reports. Which safeguard set addresses both mechanisms?
Complete both network challenges to unlock the transfer proof.