The three major decentralized storage coins are Filecoin, Storj, and Arweave.

Filecoin

Filecoin is a blockchain-based decentralized storage platform that aims to create a decentralized storage market similar to the traditional cloud storage market. It uses "storage proof" and "time-space proof" to ensure that data is stored correctly and provides flexible storage solutions. Filecoin's payment model is to get rewards by providing storage services, which ensures the reliable storage of data.

Storj

Storj is a decentralized cloud object storage platform that focuses on providing secure and privacy-protected decentralized cloud storage services. It provides cheap and easy-to-use storage solutions for traditional cloud storage users. Storj ensures the privacy and security of user data through its distributed network and encryption technology.

Arweave

Arweave focuses on long-term or permanent data storage and adopts a one-time payment model. It uses a unique "effective data mining" mechanism to incentivize miners and ensure the long-term preservation of data.