Bittensor is an open-source protocol that powers a decentralized, blockchain-based machine learning network. Machine learning models train collaboratively and are rewarded in TAO based on the informational value they provide to the collective. TAO also provides external access, allowing users to extract information from the network while customizing its activities to their needs. The ultimate goal is to create a pure market for artificial intelligence, an incentivized environment in which buyers and sellers of this valuable commodity can interact in a trustless, open, and transparent way.