2.4 Validator (Consensus layer)

• Service name: px-validator

• Tech stack: FastAPI + NumPy

• Port: 7070

• Docker image: ghcr.io/privacyx-org/px-validator

Responsibilities

• Aggregates miner responses.

• Detects statistical outliers via Z-score filtering.

• Computes consensus probability & confidence.

• Returns unified verdict to the gateway.

Algorithm overview

mu, sigma = mean(arr), std(arr)
z = abs((arr - mu) / sigma)
inliers = arr[z <= z_threshold]
consensus = trimmed_mean(inliers, trim_ratio)

Default parameters:

• z_threshold = 2.0

• trim_ratio = 0.2

Returned metrics:

{
  "consensus_prob": 0.83,
  "confidence": 0.91,
  "inliers": 3,
  "outliers": 0
}