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by btcfn 4487 days ago
Impossible. You'd have to somehow convince ALL miners to not process them.

Fungibility prevents you from simply blacklisting these coins.

http://themonetaryfuture.blogspot.it/2013/12/why-bitcoin-fun...

1 comments

Actually you just need to update the code and push it via the update mechanism.
Code of what? Bitcoin is not one central code base with a global update system.