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Sybil attacks involve a single entity creating multiple false identities to disproportionately influence the network. Arcium’s defense is Proof of Stake: every identity an attacker controls must be backed by real stake. The program enforces these stake gates today:
  • Node activation: activating an Arx node requires a primary self-delegation of 1,000 ARX. See the Staking overview.
  • Cluster eligibility: joining a Cluster requires meeting the primary-stake floor for its mempool size. Because activation already requires 1,000 ARX, the effective minimum ranges from 1,000 to 10,000 ARX. The program checks the floor when an Arx node is invited and when its operator reduces primary stake.
  • Authority-gated membership: Cluster membership is invitation-based. The Cluster authority chooses which Arx nodes to invite, and each Node Operator accepts or declines. See Permissioned Clusters.
These gates make each participating identity costly. Base-price voting gives each Cluster member one vote, so every additional voting identity must independently satisfy activation and Cluster eligibility. These controls raise the cost of coordinated identities. Cluster authorities can add offchain operator due diligence when membership independence matters.