It is not safe to generate random number with a simple entropy on chain.

[piux2]

https://github.com/gnolang/gno/blob/master/examples/gno.land/p/rand/rand.gno
I think we should not include a random number generator in the package until we have a proper solution.

Blockchain is determinstic. Generating a random number with an entropy is not safe, because all nodes need to have the same entropy and it becomes public information.

To use random numbers in smart contracts, we need to use the random numbers generated through VRF (Verifiable Random Function) from an off-chain oracle, which potentially could be a good feature provided by the cosmos hub or a dedicated oracle zone.