Gnosis is a software built on top of Ethereum's blockchain for creating prediction markets. It is an open source project started in March 2017 by an international team with core team from Germany.
The main purpose of Gnosis is to create mechanism for price prediction applications. Participants receive a set of tokens corresponding to each possible outcome and they can trade these tokens with each other or market maker. Gnosis contains two tokens: GNO, which is Ethereum ERC-20; and innerShow more [+] kens, specific for each app: OWL or OLY or any other. These inner tokens can be only generated inside Gnosis platform using GNO tokens. Gnosis software contains two layers: Gnosis Core, which provides smart contracts, market mechanism, oracles and token creation. And Application Layer, which are different applications created by various teams for prediction particular market for use case or customer segment (for example, application for prediction piece of art auction price is different from prediction of Bitcoin market price, but they both use Gnosis Core).