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I'm sorry if this is a basic question. But will the new shard chains for Ethereum2.0 be PoW or PoS?

I know the plan is for Eth1 mainnet to "dock" onto the beacon chain eventually and be its own shard. But are all other new shards going to be PoS?

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Shard chains will use Proof-of-Stake (PoS) as a distributed consensus algorithm : a set of validators ("32 ETH stakers") will be pseudorandomly chosen by the beacon chain for each slot of each shard.

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  • how do you know shard chains will be PoS? Is it documented somewhere? (I'll add the checkmark to your answer if you could supply that)
    – webbyweb
    Dec 28 '20 at 6:20
  • Very informative article here : ethos.dev/beacon-chain .
    – clement
    Dec 28 '20 at 10:19
  • At every epoch, a validator is pseudorandomly assigned to a slot and shard. The validator is participating in the consensus of that assigned shard so that it can vote for that shard’s head. The validator links the shard head to the beacon block for a slot. Note the word vote which confirms the use of PoS for the shards.
    – clement
    Dec 28 '20 at 10:21
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Shard chains are the main scalability feature that will initially consist of 64 chains and will grow over time as required. The main design goals in this phase revolve around creation, validation, and consensus of the data of shard chains. The state of each shard chain will be written periodically to the beacon chain.

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