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Topic: How much work is a "share" ? (Read 1622 times)

Pieter Wuille
legendary
Activity: 1072
Merit: 1181
How much work is a "share" ?
March 17, 2011, 09:03:17 AM
#7
Quote from: mimarob on March 17, 2011, 07:53:35 AM
sipa: Is it not then possible for the miners to cheat, when finding a "real" hash keeping it to themselves and then coining it through another client?

No, you need to decide who (what address/public key) will earn the generated 50 BTC before starting to mine, since the hash depends on it. So once you find a real hash, you only have two options: broadcast it, and let the pool gain money (of which you'll get a piece), or discard it (which is bad for everyone).
mimarob
full member
Activity: 354
Merit: 103
Re: How much work is a "share" ?
March 17, 2011, 07:53:35 AM
#6
gigabyte: that's a decent one.
A friend of mine who is also swedish read it out (in swedish) like a street-mimer in the closet... I use it because it's so odd that it is always available at forums :-)

sipa: Is it not then possible for the miners to cheat, when finding a "real" hash keeping it to themselves and then coining it through another client?

Pieter Wuille
legendary
Activity: 1072
Merit: 1181
Re: How much work is a "share" ?
March 17, 2011, 06:34:20 AM
#5
Quote from: mimarob on March 17, 2011, 05:07:02 AM
Aha so it also serves as proof that work is being done by the miner?

clever..

So the 'F':s in the middle also guarantees that it holds no bitcoin value?

When a bitcoin miner is at work, it tries many nonces x, such that sha256(sha256(block_header_with_nonce(x))) results in a number that is small enough.
Currently, this number needs to be smaller than

  000000000000DC31000000000000000000000000000000000000000000000000

(written in hex) for it to result in a real bitcoin block with value. Pools, however, (at least the ones i know about), only request hashes that are smaller than

  00000000FFFF0000000000000000000000000000000000000000000000000000

So, it will see all "real" hashes calculated by the miner, but also many hashes that are somewhat larger than this.
The pool gets its income from those real hashes calculated by the miners, and distributes them (using some formula)
according to the number of low-difficulty hashes it received from each miner.
gigabytecoin
sr. member
Activity: 280
Merit: 252
Re: How much work is a "share" ?
March 17, 2011, 06:24:30 AM
#4
Quote from: mimarob on March 17, 2011, 05:07:02 AM
Aha so it also serves as proof that work is being done by the miner?

clever..

So the 'F':s in the middle also guarantees that it holds no bitcoin value?



When I originally read your username, I read it as "nim-rod". Just thought I would mention that for a laugh! It's late, forgive me.
mimarob
full member
Activity: 354
Merit: 103
Re: How much work is a "share" ?
March 17, 2011, 05:07:02 AM
#3
Aha so it also serves as proof that work is being done by the miner?

clever..

So the 'F':s in the middle also guarantees that it holds no bitcoin value?

Pieter Wuille
legendary
Activity: 1072
Merit: 1181
Re: How much work is a "share" ?
March 16, 2011, 06:11:38 AM
#2
Quote from: mimarob on March 16, 2011, 06:00:59 AM
In the pools they often refer to something called a "share". Is there an exact correlation to the amount of work (i.e. hashes) done?

It corresponds to finding a hash whose value matches the target for difficulty 1, being 0x00000000FFFF0000..., that means it will on average correspond to 4295032833 hashes.
mimarob
full member
Activity: 354
Merit: 103
Re: How much work is a "share" ?
March 16, 2011, 06:00:59 AM
#1
In the pools they often refer to something called a "share". Is there an exact correlation to the amount of work (i.e. hashes) done?

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