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There are legitimate concerns about security on Ethereum. With such a complex system, and so many different programs running on it, the attack surface is large. And given the challenges the community faces in migrating to Ethereum 2.0, including a new proof-of-stake consensus mechanism and a sharding solution for scaling transactions, it’s still not assured it will ever be ready for prime time. 
Decentralizing Everything with Ethereum's Vitalik Buterin | Disrupt SF 2017

Ether and bitcoin are similar in many ways: each is a digital currency traded via online exchanges and stored in various types of cryptocurrency wallets. Both of these tokens are decentralized, meaning that they are not issued or regulated by a central bank or other authority. Both make use of the distributed ledger technology known as blockchain. However, there are also many crucial distinctions between the two most popular cryptocurrencies by market cap. Below, we'll take a closer look at the similarities and differences between bitcoin and ether.
BIS Plans New Central Banking Fintech Research Hubs in Europe, North America. The Bank of International Settlements – the central bank to the world’s central banks – is getting serious about its money tech R&D centers, opening innovation hubs in Toronto, Stockholm, London, Paris and Frankfurt. A coordinated, standardized approach to developing central bank digital currencies? Danny Nelson reports. 
Like other blockchains, Ethereum has a native cryptocurrency called Ether (ETH). ETH is digital money. If you’ve heard of Bitcoin, ETH has many of the same features. It is purely digital, and can be sent to anyone anywhere in the world instantly. The supply of ETH isn’t controlled by any government or company – it is decentralized, and it is scarce. People all over the world use ETH to make payments, as a store of value, or as collateral. The latest news about Ethereum mostly concerns the move to Serenity the last post-development phase of Ethereum as well as changing Ether mining’s concept from Proof-of-Work to Proof-of-Stake in order to reduce the power cost of the process.
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