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No, it's not "just copy it" because Bitcoin Cash has some OP codes that Bitcoin doesn't have. See OP_CHECKDATASIG for example.

• dylkil 7y ago
  if OP_CHECKDATASIG is beneficial btc can implement it
  • lawn 7y ago
    With Bitcoin's history of extreme hardfork aversion, it's not that simple. In theory you're right, but in practice it's much harder.
    • andirk 7y ago
      You should be able to add an optional functionality w/o a hardfork yes?
      • lawn 7y ago
        You can technically introduce anything as a softfork yes. The only difference is how difficult it is to implement, which I think would go beyond "just copy it".