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cmuratori's profile
Casey Muratori
Casey Muratori
Casey Muratori
@cmuratori

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Casey Muratori

@cmuratori

I'm worried that the baby thinks people can't change.

Seattle
caseymuratori.com
Joined March 2009

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    1. Casey Muratori‏ @cmuratori Oct 10
      Replying to @TimSweeneyEpic

      The reason is because the only point of proof of work _is_ to keep latency high. You don't actually need it for anything else. The entire point of PoW is just to have there be a single value you can check before validating a transaction block. It's DDoS protection.

      7 replies 2 retweets 48 likes
    2. chapolin‏ @chapolin__br Oct 10
      Replying to @cmuratori @TimSweeneyEpic

      as far as I know PoW is a consensus algorithm... if you refer DDoS by flooding the network with silly transactions, that I think is mainly achieved by the transaction fees...

      1 reply 0 retweets 1 like
    3. Casey Muratori‏ @cmuratori Oct 10
      Replying to @chapolin__br @TimSweeneyEpic

      PoW isn't actually a consensus algorithm. It already doesn't ensure that for BitCoin, which can fork if two miners come up with a new (valid) block close to the same time, which does happen.

      2 replies 0 retweets 1 like
    4. Casey Muratori‏ @cmuratori Oct 10
      Replying to @cmuratori @chapolin__br @TimSweeneyEpic

      The BitCoin protocol just says "well, which ever block chain gets longest is the one we'll go with". So the consensus gets solved either way.

      2 replies 0 retweets 1 like
    5. Casey Muratori‏ @cmuratori Oct 10
      Replying to @cmuratori @chapolin__br @TimSweeneyEpic

      The reason PoW "solves" DDoS is because nodes don't have to process a 1 (or up to 32mb?) block of transactions and validate each one if the PoW header doesn't match. If you didn't have the PoW header, then DDoS'ers would just spam the network with bad blocks and crash it.

      1 reply 0 retweets 3 likes
    6. Casey Muratori‏ @cmuratori Oct 10
      Replying to @cmuratori @chapolin__br @TimSweeneyEpic

      Because every BitCoin block has to be validated by every (main) node, because there is nothing to keep miners "honest". They can just put double-spends or unsigned stuff in there, or whatever. So BitCoin counts on all the nodes to actually validate each block, which is expensive.

      1 reply 0 retweets 2 likes
    7. chapolin‏ @chapolin__br Oct 10
      Replying to @cmuratori @TimSweeneyEpic

      How there is nothing? you are constantly incentivized to be honest, otherwise this whole thing would be pointless and unprofitable in the long run... PoW is what prevents the double spending.

      1 reply 0 retweets 1 like
    8. Casey Muratori‏ @cmuratori Oct 10
      Replying to @chapolin__br @TimSweeneyEpic

      PoW does not prevent double spending. Any miner can put as many double-spend transactions into their blocks as they want using PoW. It is only the validation on the other nodes that prevents this. PoW is _just_ DDoS prevention, nothing more.

      1 reply 0 retweets 4 likes
    9. Casey Muratori‏ @cmuratori Oct 10
      Replying to @cmuratori @chapolin__br @TimSweeneyEpic

      If you had infinite computing power at all nodes, you would simply remove PoW, and they would all just validate all incoming blocks and merge them, rejecting double-spends. It would "just work".

      2 replies 0 retweets 3 likes
    10. Casey Muratori‏ @cmuratori Oct 10
      Replying to @cmuratori @chapolin__br @TimSweeneyEpic

      But as it stands you could not do this because you would immediately get bad attackers spamming the network work with bogus blocks, and all the machines would then be swamped with block validation.

      1 reply 0 retweets 3 likes
      Casey Muratori‏ @cmuratori Oct 10
      Replying to @cmuratori @chapolin__br @TimSweeneyEpic

      They would still _correctly_ reject all the bogus blocks, but they would be so busy doing so, the latency would skyrocket, because they'd be spending hours invalidating bad blocks just to get to the one real block they were supposed to validate.

      4:28 PM - 10 Oct 2021
      • 2 Likes
      • Radoslaw Jurga David Deutsch
      0 replies 0 retweets 2 likes

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