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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

Bitcoin was launched in January of 2009. It introduced a novel idea set out in a white paper by the mysterious Satoshi Nakamoto—bitcoin offers the promise of an online currency that is secured without any central authority, unlike government-issued currencies. There are no physical bitcoins, only balances associated with a cryptographically secured public ledger. Although bitcoin was not the first attempts at an online currency of this type, it was the most successful in its early efforts, and it has come to be known as a predecessor in some way to virtually all cryptocurrencies which have been developed over the past decade.


That’s not to say there aren’t risks in DeFi. Many are worried that the frenzy around speculative activities such as “yield farming” and interconnected leverage could set off a systemic crisis. If that happens, maybe Bitcoin can offer an alternative, more stable architecture for it. Either way, ideas to improve DeFi are coming all the time – whether for better system-wide data or for a more trustworthy legal framework. Out of this hurly burly, something transformative will emerge. Whether it’s dominated by Ethereum or spread across different blockchains, the end result will show more cross-protocol synergy than the chains’ warring communities would suggest.	
Ripple - Bitcoin - Ethereum - EOS: Bill Gates interview How the world will change by 2030 #crypto
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