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Wanted to know the best way to generate random numbers on anchor. I heard about oracles and switchboard but also heard on candy machine v2.

What would be the most efficient way to generate a random number? If you can provide documentation would be very helpful!

Thanks

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Depends on what you need the random numbers for.

A little primer on blockchains is that they need to be deterministic and replayable, meaning we cannot achieve true randomness on-chain. For example, Imagine having two validators running your program and they both call the function to generate a random number. Which number will be picked? How can the transaction be replayed?

There are a few ways to achieve pseudo-randomness on-chain.

Safer ways to achieve this making it hard for attackers to exploit your program

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  • In this case is for a lottery, I head switchboard is a good choice but also heard of candymachine v2? is it good?
    – mark
    Commented Jun 11 at 19:31
  • Candy machine uses a combination of the slot_hash - timestamp to select the next item to mint, see github.com/metaplex-foundation/metaplex-program-library/blob/…. Candy Machine is not a PRNG library
    – Jimii
    Commented Jun 12 at 16:08

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