We're joined by Igor Barinov, the tech lead of the POA Network. The POA Network achieves a reduction in transaction costs by many orders of magnitude by having a set of trusted validators. All validators must be US public notaries, so their identities are known and legal recourse against them can be taken in the offchain world. We also talk about the xDai network, which enables Dai transactions on a POA chain: Dai are transferred into a smart contract on the mainnet and then become available to be transferred at much lower cost on the POA Network. Similarly, they can be transferred out of the xDai network and become available again on the mainchain. We talk about use cases, governance, and limitations. Topics discussed in this episode:Igor's background and how he got into blockchainThe POA network setup and how to become a validatorWhat informs design decisions and how to find suitable notariesThe consensus mechanism on the POA NetworkThe role of the POA tokenThe xDai network and its purposeThe role of the DPOS tokenUse cases of POA and xDai Networks Links mentioned in this episode: POA Network websitePOA products overviewxDAI ChainPOSDAO White paperOcean Protocol releases own POA networkBeginners guide: What's the POA network Sponsors: StarkWare Sessions: September 16th in Tel Aviv '" 20% off with the code EPICENTERTrail of Bits: Trust the team at the forefront of blockchain security researchVaultoro: Trade gold to Bitcoin instantly and securely starting at just 1mg This episode is hosted by Meher Roy & Friederike Ernst. Show notes and listening options: epicenter.tv/299