Checkpoint

Also known as “checkpoint lockin”. A very deep block (several days old) accepted by the overwhelming majority of users. Reorganization will not occur past that point. Protects most of the history from a 51% attack. Since the checkpoints affect how the main chain is determined, they become part of the protocol and must be recognized by alternative nodes.

Reference:

Malone, J.A (2015). Glossary of Bitcoin Terms and Definitions. United States: Lulu Press, Inc

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