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Arcium.toml is auto-generated by arcium init and configures the Arcium CLI tooling. It lives at the root of your project alongside Anchor.toml.

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Localnet configuration

The [localnet] section controls your local development cluster. All required fields are auto-generated by arcium init with sensible defaults.
FieldTypeRequiredDefaultDescription
nodesintegerYes2Number of MPC nodes. Minimum: 2
nodes_ipsarray of [u8; 4]NoSequential from 172.20.0.100IPv4 addresses for each node
localnet_timeout_secsintegerYes60Seconds to wait for localnet startup
backendsarray of stringNo["Cerberus"]MPC backends (only "Cerberus" supported)

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Cluster configuration

The [clusters.<name>] sections map network names to cluster offsets. These entries are used by arcium test --cluster <name> to resolve the cluster offset for testing.
FieldTypeRequiredDescription
offsetintegerYesCluster offset for PDA derivation. See Deployment - Cluster offsets for current values.

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Full example

[localnet]
nodes = 2
nodes_ips = [
  [172, 20, 0, 100],
  [172, 20, 0, 101]
]
localnet_timeout_secs = 60
backends = ["Cerberus"]

[clusters.devnet]
offset = 456

[clusters.mainnet]
offset = 2026