# Randomness

There are apps in the Glow ecosystem that require a **trusted and verifiable source of randomness** to function properly. An example of this is the Glow Lotto.

In Glow Lotto, we are using the most decentralized and verifiable source of randomness available in the Terra ecosystem: [Terrand](https://docs.terrand.dev/). 

Terrand, co-built by the CosmWasm and the Loterra team, uses CosmWasm smart contracts to act as a relayer of [drand](https://drand.love/), one of the most secure and recognised random number generators on the Internet. Drand is supported by the League of Entropy, a council initiated by Protocol Labs and constituted by reputable institutions such as Cloudflare, the Ethereum Foundation and the UCL.

Combining a non-predictable, bias-resistant and verifiable source of randomness such as drand and the decentralized censorship of smart contracts, Terrand guarantees the fairness and security of any random number used in Glow apps.