Trail of Bits says that 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.
Funny that they never mention how much of the internet relies on how few ISPs when they talk about other critical infrastructure
...such as the electrical grids, tap water and sewer plants, parts of the military, VoIP for the police, the whole traditional banking industry.....
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yes really they have found internet vulnerabilities which are also bitcoin and every other internet infrastructure vulnerabilities