[JoshTriplett]

> How can data be retracted from a blockchain?

In much the same way data can be retracted from printed copies of newspapers that already have widely circulated copies in both personal and institutional/library hands: by publishing a subsequent retraction later in the chain, like any other change.

[simonsaidit]

The change and what was previously there is left for anyone to see in the blockchain.

[manojlds]

And printed copies are not?

[simonsaidit]

Sure. But in the days of it systems and digitalization less and less is being printed. It’s also quite difficult to find and access these printed copies someone might have stored somewhere.