📅 Original date posted:2015-05-30
📝 Original message:On Sat, May 30, 2015 at 9:57 PM, Gavin Andresen <gavinandresen at gmail.com> wrote:
>> Bad miners could attack us and the network with artificial
>> big blocks.
>
>
> How?
>
> I ran some simulations, and I could not find a network topology where a big
> miner producing big blocks could cause a loss of profit to another miner
> (big or small) producing smaller blocks:
>
> http://gavinandresen.ninja/are-bigger-blocks-better-for-bigger-miners
>
> (the 0.3% advantage I DID find was for the situation where EVERYBODY was
> producing big blocks).
If someone propagate a 20MB block, it will take at best 6 seconds for
us to receive to verify it at current configuration, result of one
percent orphan rate increase. Or, we can mine the next block only on
the previous block's header, in this case, the network would see many
more transaction-less blocks.
Our orphan rate is about 0.5% over the past few months. If the network
floods 20MB blocks, it can be well above 2%. Besides bandwidth, A 20MB
block could contain an average of 50000 transactions, hundred of
thousands of sigops, Do you have an estimate how long it takes on the
submitblock rpccall?
For references, our 30Mbps bandwidth in Beijing costs us 1350 dollars
per month. We also use Aliyun and Linode cloud services for block
propagation. As of May 2015, the price is 0.13 U.S. dollars per GB for
100Mbps connectivity at Aliyun. For a single cross-border TCP
connection, it would be certainly far slower than 12.5 MB/s.
I think we can accept 5MB block at most.
(sorry forgot to cc to the mailing list)
Chun Wang [ARCHIVE] /
npub1ed…mqjxc
2023-06-07 15:35:57
in reply to nevent1q…plgh
Author Public Key
npub1edz8qyleqfqddckyjs0erkqysv2n76fwatw32nehpm5k7gertf4shmqjxcPublished at
2023-06-07 15:35:57Event JSON
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"content": "📅 Original date posted:2015-05-30\n📝 Original message:On Sat, May 30, 2015 at 9:57 PM, Gavin Andresen \u003cgavinandresen at gmail.com\u003e wrote:\n\u003e\u003e Bad miners could attack us and the network with artificial\n\u003e\u003e big blocks.\n\u003e\n\u003e\n\u003e How?\n\u003e\n\u003e I ran some simulations, and I could not find a network topology where a big\n\u003e miner producing big blocks could cause a loss of profit to another miner\n\u003e (big or small) producing smaller blocks:\n\u003e\n\u003e http://gavinandresen.ninja/are-bigger-blocks-better-for-bigger-miners\n\u003e\n\u003e (the 0.3% advantage I DID find was for the situation where EVERYBODY was\n\u003e producing big blocks).\n\nIf someone propagate a 20MB block, it will take at best 6 seconds for\nus to receive to verify it at current configuration, result of one\npercent orphan rate increase. Or, we can mine the next block only on\nthe previous block's header, in this case, the network would see many\nmore transaction-less blocks.\n\nOur orphan rate is about 0.5% over the past few months. If the network\nfloods 20MB blocks, it can be well above 2%. Besides bandwidth, A 20MB\nblock could contain an average of 50000 transactions, hundred of\nthousands of sigops, Do you have an estimate how long it takes on the\nsubmitblock rpccall?\n\nFor references, our 30Mbps bandwidth in Beijing costs us 1350 dollars\nper month. We also use Aliyun and Linode cloud services for block\npropagation. As of May 2015, the price is 0.13 U.S. dollars per GB for\n100Mbps connectivity at Aliyun. For a single cross-border TCP\nconnection, it would be certainly far slower than 12.5 MB/s.\n\nI think we can accept 5MB block at most.\n\n(sorry forgot to cc to the mailing list)",
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