Vlad Zamfir

Bringing Ethereum Towards Proof-of-Stake with Casper

With Proof-of-Stake (PoS) a blockchain is secured not by spending an external resource such as electricity but by using value internal to the chain itself. The promise of higher security at a lower cost is what also drives Ethereum to plan a move away from Proof-of-Work to PoS in the future.

Ethereum researcher Vlad Zamfir, who leads their effort in the complex search for the optimal PoS consensus system joined us for an in-depth discussion of the challenges of PoS, the approach Casper is taking and what consensus in Ethereum land could look like in the future.

Topics we discussed in this episode
  • How he became interested in consensus and Proof-of-Stake (PoS)
  • Why Ethereum plans to switch to the PoS systems Casper in the future
  • What the Long-Range Attack and Nothing-at-Stake problems are and how Casper addresses them
  • How a betting mechanism is used to get validators to reach consensus
  • What centralization pressures exist for validators and what operating a validator will look like
  • The role of security deposits in Casper
  • The difference between Tendermint and Casper
  • Whether forks create big UI/UX issues for Casper
  • Why Casper is very light client friendly