Analysis | Documentation reviewed September 17, 2026.
Arc applications can use familiar Ethereum development tools, but game developers face a compatibility difference: block.prevrandao always returns zero. Circle's September 10 compatibility guide explicitly warns developers against relying on it for randomness.
The implication is narrow but significant. An imported contract may execute successfully while losing an input its designer expected to be unpredictable. Games that select winners, assign scarce items or resolve dice rolls need a different mechanism.
D20DAO documents one available approach, with VRF coordinator deployments on Arc Mainnet and Arc Testnet. Its mainnet coordinator is visible as a proxy contract in Arc's explorer. Consumer contracts request a result and receive a subsequent proof-backed response, rather than treating a block field as a ready-made random number.
That adds an application-level service choice. Teams can evaluate the proof mechanism, integration tools, response handling and operating costs together. It does not establish that every game built on the service is fair or that response delivery is guaranteed.
D20DAO's documentation describes a single operator and upgradeable contracts. Its SDK also states that the contracts have not received an external security audit. Those qualifications matter when moving from an integration experiment to a game holding player funds.
Sources: Circle compatibility guide, Arc EVM differences, D20DAO deployments, mainnet coordinator, D20DAO security model, SDK.