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A Technical Q&A on Network Partition Attacks on Bitcoin and its Proof-of-Stake algorithms. Bitcoin is prone to many different types of attack. Bitcoin is surprisingly centralized from an Internet routing perspective: 20% of the Bitcoin nodes are hosted in less than 100 IP prefixes. Any malicious ISP with access to the Internet routing infrastructure can perform this attack which starts to be effective after only few minutes. Any ISP transiting Bitcoin traffic can delay the propagation of mined blocks (for up to 20 minutes), in a stealth way, even if she sees one direction of the traffic.