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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 minimum primary-stake floor for that Cluster’s mempool size, from 100 ARX up to 10,000 ARX. The floor is enforced when a node is invited and rechecked when a bound node tries to reduce its stake.
  • Authority-gated membership: Cluster membership is invitation-based. The Cluster authority chooses which nodes to invite, and each node individually accepts or declines. See Permissioned Clusters.
These gates make identities costly. Protocol-wide mechanisms such as base-price voting give each Cluster node one vote, so every additional voting identity an attacker runs must independently clear node activation and the Cluster’s stake floor. Additional Sybil-resistance mechanisms are part of ongoing protocol design.