Verifiable randomness provides a tamper-proof source of chance for on-chain programs. Unlike pseudorandom values derived from timestamps or block hashes, it is generated off-chain and delivered alongside a cryptographic proof that anyone can verify on-chain.

MagicBlock exposes this capability through EphemeralVrf – a Solana VRF implementation that uses a network of oracles to compute and verify random values. The protocol follows RFC 9381, leveraging Curve25519’s Ristretto group and Schnorr‑style signatures for proofs. See the Technical Details page for integration specifics.

MagicBlock rollups access this randomness through the ephemeral_vrf_sdk, which runs entirely within the ephemeral rollup execution window.

This lets programs implement mechanics like loot drops, gacha pulls, or matchmaking without trusting a single party. The receipt proves that the number was produced fairly and cannot be manipulated.

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Example use cases

  • Provably fair loot boxes or chest drops
  • Secure gacha systems
  • Randomized spawn or resource generation
  • Chain-verified PvP matchmaking
  • Trustless raffles or giveaways