Gnosis (GNO) is a decentralized platform built on the Ethereum blockchain, which strives to create a global, open prediction market. It operates as a decentralized autonomous organization (DAO), providing infrastructure for various types of decentralized applications (dApps). Gnosis was founded in 2015 with a focus on building prediction markets to enable worldwide access to accurate information. The platform's native cryptocurrency, GNO, is used to operate and govern the platform. Gnosis has a maximum supply of 3,000,000 coins, with a circulating supply of 2,589,588 GNO at the time of writing.

Gnosis aims to utilize the Ethereum blockchain to create a decentralized prediction market. It uses smart contracts to manage transactions and create outcome tokens for each event. These tokens represent the possible outcomes of a prediction market. Users can acquire and trade these tokens, with the price of each token reflecting its probability of occurrence. Gnosis also uses a multisig wallet, requiring a pre-fixed number of signatures before a transaction can be executed. The platform's security is further enhanced by the Ethereum’s Proof-of-Stake (PoS) consensus mechanism and a series of smart contracts that are frequently audited.

Gnosis strives to provide a platform for information gathering and decision-making processes. It can be used to create prediction markets on a wide range of topics, from elections to financial markets. The platform can also be used to create financial instruments and insurance products. Developers can use Gnosis to build their own prediction market applications, with the platform providing the necessary infrastructure and tools. GNO owners can participate in the prediction market, express their opinion on protocol changes, and influence the project's development direction.

Gnosis launched under ConsenSys Inc., an Ethereum-focused software company, in 2015. It became independent in 2017 after winning funding and launched its native GNO token in the same year. The core team is led by Martin Köppelmann (CEO and co-founder), Stefan George (CTO and co-founder), and Dr. Friederike Ernst (COO). In November 2021, the xDAI and GnosisDAO community voted to combine their ecosystems to create the Gnosis Chain, an Ethereum forerunner-companion that aims to address scaling issues.