Review Casper FFG

[maxisacoder]

Core Spec

casper ffg basics

• validator vote on checkpoints

• ⟨ν, s, t, h(s), h(t)⟩

• FOLLOW THE CHAIN CONTAINING THE JUSTIFIED CHECKPOINT OF THE GREATEST HEIGHT.

• reward

  • CASPER_BALANCE 1.25M ETH
  • https://github.com/ethereum/EIPs/blob/master/EIPS/eip-1011.md

• panelty

  • https://github.com/ethereum/casper/blob/master/casper/contracts/simple_casper.v.py
  • 4% finder fee
  • slash amount，all of validator deposit

• economics

  • https://github.com/ethereum/research/blob/master/papers/casper-economics/casper_economics_basic.pdf

what Checkpoint means?

In bitcoin context

• bitcoin start: https://bitcointalk.org/index.php?topic=437
• bitcoin end: https://bitcointalk.org/index.php?topic=1647
  • #19 楼强调了两遍 “More importantly: I will not use versions of Bitcoin that have stupid rules.” Bitcoin社区里面的老炮果然名不虚传。
  • "FUD" would be described as anything which intends to install "fear, uncertainty, or doubt" in Bitcoin
  • tentative 这个哥们非常喜欢卖关子

Nothing at stake

PeerCoin argue to this attack

• a theoretical attack vector but never happen in real life
• protection machnisim: https://talk.peercoin.net/t/pillows-peercoin-myths/2518/38#msg27787
  • honest node do not propogate the slash block
  • bad behavior may lead to fork on network, which heart the validator's interest

inspiration

• deposit 的 delay
  • by case:
  • by person:
• crash of validtor
  • offline of juror

Sharding

• https://ethresear.ch/t/convenience-link-to-casper-sharding-chain-v2-1-spec/2332
• https://www.mangoresearch.co/ethereum-casper-v2-beacon-chain-sharding-explained-simply/
• head first: https://media.consensys.net/state-of-ethereum-protocol-1-d3211dd0f6

References

• https://ethfans.org/posts/the-history-of-casper-part-2
• https://medium.com/@Vlad_Zamfir/the-history-of-casper-chapter-2-8e09b9d3b780
• https://blog.ethereum.org/2014/01/15/slasher-a-punitive-proof-of-stake-algorithm/
• https://medium.com/coinmonks/understanding-proof-of-stake-the-nothing-at-stake-theory-1f0d71bc027
• https://github.com/ethereum/wiki/wiki/Proof-of-Stake-FAQs#what-are-the-benefits-of-proof-of-stake-as-opposed-to-proof-of-work
• https://medium.com/@VitalikButerin/a-proof-of-stake-design-philosophy-506585978d51
• https://medium.com/@abhisharm/understanding-proof-of-stake-through-its-flaws-pt-1-6728020994a1
• https://medium.com/coinmonks/blockchain-finality-pow-and-pos-35915a37c682
• https://medium.com/@VitalikButerin/a-proof-of-stake-design-philosophy-506585978d51