Bitcoinist.net:

ethereum 2.0 developments

The deposit smart contract for Ethereum 2.0 has completed formal verification and audit of the bytecode. Continued optimizations to ETH 2.0’s beacon chain are also underway. 

Ethereum 2.0 is Getting Closer to Reality
Formal Verification (FV) is essential to production software development. FV is a method of analyzing the code semantics to make sure they adhere to certain properties. Many of the vulnerabilities in smart contracts are semantic errors in the code that allow undesired outcomes of code execution. This means glitches like the DAO hack can happen, contrary to the intentions of the creator of the smart contract.
Ethereum just finished its FV analysis of the Ethereum 2 deposit smart contract bytecode. Bytecode is a low-level code that runs in the Ethereum Virtual Machine (VM). The Ethereum VM takes code written in Solidity…

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Source: https://bitcoinist.com/ethereum-2-0-has-made-some-critical-advances/