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Solidity is a fairly new language and as no code is perfect, it contains issues related to the code and what you want to accomplish with it. This article will guide you through the best practices and pitfalls when using a random number as input for your Ethereum smart contract.

Solidity is not capable of creating random numbers. Actually, every algorithm for creating random numbers is pseudorandom — no language is capable of creating completely random numbers.

The problem with Solidity is that complex algorithms cost too much, so more basic solutions are used. Besides that, Solidity code should be deterministic, as it will run on multiple nodes.

We need an algorithm that is able to generate a random number once, and use it on multiple nodes. Things like a clock time are not available for generating random numbers, so we have to look at other options. Read more from sitepoint.com…

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