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A while ago bitcoin clients changed from facoring the 'longest' chain to favoring the chain with the most work done on it. (To prevent long chains with low diff

• somebodythere 5y ago
  So... the consensus rules of the network changed, you need to make sure you have the correct client, and bitcoin is weakly subjective after all?
  • rocqua 5y ago
    In practice this was essentially a soft-fork. But yes the consensus rules of bitcoin software changed.
  • madacol 5y ago
    Asking "what's the correct client?" will always be a subjective question Bitcoin doesn't decide what is called bitcoin, we as a community do
• PeterisP 5y ago
  The client can choose properly, but it needs to "call a friend" in order to get the options - if the client doesn't receive the proper chain but only fake ones, it will chose the fake one with the most work done on it.