Proof of stake Casper (PoS Casper)

Last updated 5 months ago


  • validators stake a portion of their Ethers as stake.

  • validators start validating the blocks. when they discover a block which they think can be added to the chain, they will validate it by placing a bet on it.

  • If the block gets appended, he validators will get a reward proportionate to their bets.

  • Malicious validator acts trying to do a “nothing at stake”, the will immediately be punished, and all of their stake is going to get slashed.


  • all Pros of Proof of stake

  • punish validator trying to do a “nothing at stake” attack,

  • punishing miners who go offline, unintentionally or not,

Used in

  • Casper the Friendly Finality Gadget (FFG), hybrid PoW/PoS that will be implmented first and ease transtion to full PoS. blocks are mined using POW, every 50th block a POS checkpoint where finality is assessed by a network of validators will be used.

  • Casper the Friendly GHOST: Correct-by-Construction (CBC): full PoS