📅 Original date posted:2017-05-18
📝 Original message:On Thu, May 18, 2017 at 2:44 PM, Cameron Garnham via bitcoin-dev <
bitcoin-dev at lists.linuxfoundation.org> wrote:
> 1. Significant deviations from the Bitcoin Security Model have been
> acknowledged as security vulnerabilities.
>
> The Bitcoin Security Model assumes that every input into the Proof-of-Work
> function should have the same difficulty of producing a desired output.
>
This isn't really that clear.
Arguably as long as the effort to find a block is proportional to the block
difficulty parameter, then it isn't an exploit. It is just an optimisation.
A quantum computer, for example, could find a block with effort
proportional to the square root of the difficulty parameter, so that would
count as an attack. Though in that case, the fix would likely be to tweak
the difficulty parameter update calculation.
A better definition would be something like "when performing work, each
hash should be independent".
ASICBOOST does multiple checks in parallel, so would violate that.
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Tier Nolan [ARCHIVE] /
npub1g6…sl5wd
2023-06-07 18:01:18
in reply to nevent1q…0m23
Author Public Key
npub1g6vxlp4e0nyhs2dqxxcryztyf5f5hyuaq93nw4r87zcnv0sdsa0qqsl5wdPublished at
2023-06-07 18:01:18Event JSON
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"content": "📅 Original date posted:2017-05-18\n📝 Original message:On Thu, May 18, 2017 at 2:44 PM, Cameron Garnham via bitcoin-dev \u003c\nbitcoin-dev at lists.linuxfoundation.org\u003e wrote:\n\n\u003e 1. Significant deviations from the Bitcoin Security Model have been\n\u003e acknowledged as security vulnerabilities.\n\u003e\n\u003e The Bitcoin Security Model assumes that every input into the Proof-of-Work\n\u003e function should have the same difficulty of producing a desired output.\n\u003e\n\nThis isn't really that clear.\n\nArguably as long as the effort to find a block is proportional to the block\ndifficulty parameter, then it isn't an exploit. It is just an optimisation.\n\nA quantum computer, for example, could find a block with effort\nproportional to the square root of the difficulty parameter, so that would\ncount as an attack. Though in that case, the fix would likely be to tweak\nthe difficulty parameter update calculation.\n\nA better definition would be something like \"when performing work, each\nhash should be independent\".\n\nASICBOOST does multiple checks in parallel, so would violate that.\n-------------- next part --------------\nAn HTML attachment was scrubbed...\nURL: \u003chttp://lists.linuxfoundation.org/pipermail/bitcoin-dev/attachments/20170518/8af10956/attachment.html\u003e",
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