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A hardfork is when a new version of the STEEM software which runs Steemit.com and other sites is upgraded to make changes or add new features.

Collectively the witnesses must either accept the new software and upgrade as a whole or not update and give explanation as to why the stand against the proposed changes.

Oh, okay. That makes sense. Thank you!

In simplest terms it's a change of the software.

great question...... the answer not so easy. lol

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