Casper

Casper is a security-deposit based economic consensus protocol. This means that nodes, so called “bonded validators”, have to place a security deposit (an action we call “bonding”) in order to serve the consensus by producing blocks. If a validator produces anything that Casper considers “invalid”, the deposit is forfeited along with the privilege of participating in the consensus process.

Reference:

http://ethdocs.org/en/latest/glossary.html

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