On November 22nd, Vitalik Buterin, co-founder of Ethereum, released the Sublinear Staking Contract bug bounty program on the Bountycaster platform, with a total bonus of 2 ETH. The program aims to find potential vulnerabilities in the contract and solicit specific fixes. Bonuses for multiple problems will be distributed according to the severity. The sub-linear staking contract allows whitelisted users (specified through the ERC1155 set) to pledge N tokens, and each slot can receive a token return of 0.75 to the power of N. The contract has a fundedUntil mechanism to ensure that when funds are exhausted, the pledger can receive all rewards up to the fundedUntil timestamp, avoiding a partial reserve state.