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I've confirmed with the dev that it works as expected, not as described by @ecoinstant: it is the lowest price among median prices from last 3.5 days. So an outlier price error from one or two witnesses will not cause any issues.

Just had that thought too, price was on the rise. Thanks for confirming!

Thank you for confirming this!

AFAIK it is the lowest median value over the period, not the lowest feed value. That was how it was specified originally. I'll double check with the dev to be sure it was correctly implemented.