I understand that the generic blockchain faces a problem where it can choose to optimize between scalability, security and decentralization. I can see easily why scalability and decentralization are at odds (for those who haven't seen it, a great blog post here explains this).

However, what does it mean to have a blockchain that is scalable and decentralized but insecure? No matter how I formulate the problem, I always end up at a compromise between block size/rate and decentralization.

  • A directed acyclic graph DAG accomplishes to be decentralized and scalable, but fails the finality. – Ismael Dec 24 '18 at 19:21
  • Maybe you could comment on how finality = security? – user1936752 Dec 24 '18 at 20:48
  • Security is protection against blockchain attacks like double spends. Finality is good against double spend attacks, but it is not the only attack possible. So not finality implies not security, but reverse is not true. – Ismael Dec 26 '18 at 0:00

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