On-Chain Random Numbers

We are introducing an on-chain RNG based on RANDAO. It may be leveraged by smart contract developers to introduce random numbers into their applications. Note that random numbers are limited to certain blocks in the current implementation. See below for more information.

• PRNG implementation explainer

• How to access the random seed in a smart contract

• Randomness FAQs

The following article explains on-chain randomness functions and how they will be used when POSDAO is implemented. It includes concepts and an example, and is a good place to start.

https://forum.poa.network/t/reliable-randomness-bringing-on-chain-entropy-to-the-xdai-stable-chain/3015

Randomness Contract (RandomAuRa)

POA Core

Block	Date	Contract
14350721	03/31/2020	0x67e90a54AeEA85f21949c645082FE95d77BC1E70

POA Sokol (Testnet)

Block	Date	Contract
13391641	02/20/2020	0x8f2b78169B0970F11a762e56659Db52B59CBCf1B

The current implementation requires a chain running OpenEthereum AuRa consensus mechanism with version 2.7.2+. The Random Number generation contract was introduced in this PR.