“With the current industry-adopted mining protocol Stratum V1, the handful of mining pools participates in transaction selection, which makes bitcoin more prone to censorship. Stratum v2 is an updated protocol, which ensures that transaction selection is done by miners themselves.”

https://bitcoinmagazine.com/technical/developers-announce-stratum-v2-update-for-decentralized-bitcoin-mining?utm_source=carrot&utm_medium=partner&utm_campaign=carrot_share