Picked up a project recently where secure randomness is critical—turns out, pulling fresh entropy on-chain isn’t as straightforward as it seems. Most patterns I’ve seen rely on commit-reveal schemes, RNG oracles, or VDFs, but every approach has trade-offs in latency, gas costs, or security assumptions. Is anyone tinkering with post-quantum-safe entropy sources, or is off-chain preprocessing still the go-to? How are you handling this in DeFi protocols today?
What’s the deal with on-chain randomness in smart contracts?
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Yeah, randomness on-chain is a real headache—especially when you're dealing with high-value DeFi stuff where every bit of unpredictability matters. I ran into the exact same issue last month when I was building a gambling dApp. Commit-reveal schemes worked at first, but the gas costs piled up fast because you need multiple transactions just to finalize a single random number. Switched to Chainlink VRF in the end since latency wasn’t a dealbreaker for our use case, but the oracle fees still stung.
For post-quantum stuff, I’ve seen some experimental libraries using lattice-based entropy pools, but honestly? Most teams I’ve talked to are still sticking with off-chain preprocessing (like signing randomness from a trusted server) because the overhead of quantum-resistant algorithms on-chain is just too brutal right now. If you’re pushing for on-chain security though, VDFs with crypto-economic slashing could be the next big thing—though I haven’t seen a production-ready implementation yet. What’s your setup looking like so far?