Contracts

Source lives in the repo under contracts/. Foundry script Deploy.s.sol targets Saigon then mainnet. Fulfillment verifies a Chainlink-format VRF proof with the audited, vendored Chainlink VRF.sol(the same verifier native Ronin VRF uses). The proof seed binds the request blockhash, request id, consumer and the oracle key hash; the oracle set is snapshotted per request, so neither the oracle nor the owner can produce a second valid output for the same request.

Coordinator (both chains)  0xC66eB2e7EE91145875000Ad46B55600000000001
Saigon   chain 202601  live
Mainnet  chain 2020  live

• RandooVRFCoordinator: Ronin pay-per-request. Subscriptions frozen.
• Drop-in for the standard VRFConsumer base: keep inheriting it and swap the coordinator address at deploy.
• Payment is computed on-chain from gasleft × declared gasPrice.
• ABI drop-in, not a semantic clone of native Ronin (different seed derivation, non-proxy).
• VRF proving key and gas wallet are separate keys; oracles rotate in turn and misses are counted on-chain per key hash.
• DualVrfRace: playground harness that fires both coordinators in one transaction so the head-to-head shares a request block.