[bitcoin-dev] Defending against empty or near empty blocks from malicious miner takeover?
cannon at cannon-ciota.info
Sat Mar 25 16:12:54 UTC 2017
On 03/24/2017 07:00 PM, Aymeric Vitte wrote:
> I don't know what "Time is running short I fear" stands for and when 50%
> is supposed to be reached
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On 03/24/2017 07:00 PM, Aymeric Vitte wrote: > I don't know what
"Time is running short I fear" stands for and when 50% > is supposed
to be reached
According to current hashrate distribution tracking site coin.dance,
very likely within less than four weeks according to current hashrate
While a fork is very likely, that I dont really fear because worst
case scenario is that bitcoin still survives and the invalid chain
becomes an alt. My fear is the centralized mining power being used
to attack the valid chain with intentions on killing it. 
Shouldn't this 50% attack they are threatening be a concern? If it
is a concern, what options are on the table. If it is not a concern
please enlightent me as to why.
The attack quoted from his article:
[Level 2] Anti-split protection Miners will orphan the
blocks of non-compliant miners prior to the first larger block
to serve as a reminder to upgrade. Simply due to the possibility
of having blocks orphaned, all miners would be motivated to
begin signalling for larger blocks once support definitively
passes 51%. If some miners hold out (e.g., they may not be
paying attention regarding the upgrade), then they will begin
to pay attention after losing approximately $15,000 of revenue
due to an orphaned block.
[Level 3] Anti-split protection In the scenario where Levels
1 and 2 protection fails to entice all non-compliant miners to
upgrade, a small-block minority chain may emerge. To address the
risk of coins being spent on this chain (replay risk), majority
miners will deploy hash power as needed to ensure the minority
chain includes only empty blocks after the forking point. This
can easily be accomplished if the majority miners maintain a
secret chain of empty blocks built off their last empty
block publishing only as much of this chain as necessary
to orphan any non-empty blocks produced on the minority chain.
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