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A comment on Bitcoin Sidechains. Parent comment

Re:Bitcoin Sidechains by wslh on Tuesday October 28, 2014 @10:22AM (#8521052)
Prior related invention in 2012 by my co-founder: https://bitcointalk.org/index.php?topic=91843.0

Limitations of this side-chains:

- Can't use proof-of-stake

- It requires many changes in the Bitcoin reference client

- It's not very clear if you can increase the frequency of blocks in the side-chain

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Re:Bitcoin Sidechains by nivertech on Tuesday October 28, 2014 @11:53AM (#8521580)
Can you please explain why PoS is incompatible with sidechains?
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Re:Bitcoin Sidechains by drcode on Tuesday October 28, 2014 @12:07PM (#8521678)
IANA blockchain expert, but this is my understanding:

You need to be able to show a "proof" to the bitcoin main network that the coins are being transferred back to the bitcoin blockchain. This proof needs to be hard to generate, which pretty much makes POW mandatory.

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Re:Bitcoin Sidechains by dllthomas on Tuesday October 28, 2014 @01:13PM (#8522044)
Do you know if that's 1) "must use POW for the transaction that burns the sidecoins", 2) "must have proof of enough total work in the sidechain atop the block in question", or 3) "must only have POW blocks in the sidechain"? Superficially, 2 seems most likely.
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