According to Odaily Planet Daily, Soroban is a smart contract platform on Stellar that was launched on the mainnet on February 20, 2024, following a successful validator vote. Nearly three months later, another protocol vote is coming. On June 18, Stellar public network validators will vote on whether to upgrade the network to Protocol 21. If the vote passes, five new core advancement proposals (CAPs) will be activated on the Stellar mainnet.