"it only takes four entities to disrupt #Bitcoin and only two to disrupt #Ethereum. Additionally, 60% of all Bitcoin traffic moves through just three ISPs"
https://www.techrepublic.com/article/pentagon-finds-concerning-vulnerabilities-on-blockchain/
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Check out the report: "Are Blockchains Decentralized? Unintended Centralities in Distributed Ledgers"
Discussion on Reddit: https://www.reddit.com/r/technology/comments/vo5eip/pentagon_finds_concerning_vulnerabilities_on/