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The recent attack on Ethereum Classic wasn't a hack. With enough resources, *any* blockchain can be compromised. The core Bitcoin and Ethereum mining communities are large enough to make this prohibitively expensive, but not smaller blockchains.https://www.theverge.com/2019/1/9/18174407/ethereum-classic-hack-51-percent-attack-double-spend-crypto …
“Any coin not burning $100,000 per hour should probably be considered insecure in the face of attackers," in other words any coin other than BTC, ETH, or coins built on ETH.
I would also say using blockchain for other applications like identity or voting or storage is generally dubious, unless built on top of ETH. I would expect crypto investors to focus their investments into BTC + ETH based on this.
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