<p>It is of course possible... however it is <strong>incredibly</strong> unlikely!</p>

<p>Mining with a CPU has not been profitable since the earliest days of bitcoin, the expected time to find a block is likely on the order of centuries at this point, and by that time you'll have burned much more in electricity costs than the eventual block reward.</p>

<p>So, as an experiment you could try, but if it costs you even just $5 worth of electricity a month, you would <strong>actually</strong> have better odds spending that money on a lottery ticket!</p>

CC BY-SA 3.0
2017-12-16T00:32:51.520Z
2017-12-16T00:32:51.520Z
chytrik
<p>It is <em>theoretically</em> possible.</p>

<p>Blockchain.com estimates that the <a href="https://blockchain.info/charts/hash-rate" rel="noreferrer">hashrate</a> of bitcoin is 13,000,000,000,000,000,000 hashes/second.  Any one of those hashes could be "The lucky one" that earns 12.5BTC.  Your <a href="https://en.bitcoin.it/wiki/Non-specialized_hardware_comparison#CPUs.2FAPUs" rel="noreferrer">CPU</a> can get on the order of 2,000,000 hashes/second (plus or minus).  This means your computer has roughly a 1 in 65,000,000,000,000 chance of being the lucky one that mines the block.  The remaining 64,999,999,999,999 times, it's someone else (typically someone with a huge ASIC rig).  If you  mined for a billion years, you could actually <em>expect</em> to mine a block (using "expect" as in the statistical "expectation" of a random variable). </p>

<p>A bitcoin block is mined roughly every 10 minutes.  At $20k per bitcoin (extrapolating a bit, based on its current excitement), that's $250k generated every 10 minutes.  You have a 1 in 65,000,000,000,000 chance of being that one.  Accordingly, your expected earnings (due to that random luck chance of getting the right chance) is .0000003846 cents/10minutes, or .0000023 cents/hr.  If you are spending more on electricity than that, you're wasting your money.</p>

CC BY-SA 3.0
2018-01-12T22:39:03.047Z
Mathemagician! !
David
CC BY-SA 3.0
2017-12-16T03:56:14.410Z
2017-12-16T03:56:14.410Z
Cort Ammon
<p>I've heard it is not profitable to mine bitcoins on a regular computer via CPU anymore. I accept that.</p>

<p>However, if you did install a miner onto a regular computer and that computer randomly generated "guesses" 24/7 (in a non-sequential fashion). Isn't it quite possible that it could make a lucky guess and beat everyone else mining?</p>

<p>Or, is that absolutely impossible?</p>

<p>I'm thinking about trying my luck at this (without joining a pool) (for fun) if it is possible. If impossible, then please explain why.</p>

CC BY-SA 3.0
2017-12-16T00:49:51.903Z
It is possible that the very first hash it tries could be successful, and then it "earns" 12.5 BTC for a few seconds of work.  However, the odds of that happening are roughly larger than the age of the universe.
abelenky
CC BY-SA 3.0
2017-12-16T10:01:58.910Z
@abelenky: "the odds of that happening are roughly larger than the age of the universe". Ever heard of [dimensional analysis](https://en.wikipedia.org/wiki/Dimensional_analysis)?
Eric Duminil
CC BY-SA 4.0
2020-02-09T17:52:18.183Z
Possible duplicate of https://bitcoin.stackexchange.com/questions/24185/lottery-mining
Murch
<mining-profitability>
Is it possible for a slow computer to beat the world mining Bitcoin?
Lonnie Best
# Is it possible for a slow computer to beat the world mining Bitcoin?

(Asked by: username_0 on 2017-12-15)

I've heard it is not profitable to mine bitcoins on a regular computer via CPU anymore. I accept that.

However, if you did install a miner onto a regular computer and that computer randomly generated "guesses" 24/7 (in a non-sequential fashion). Isn't it quite possible that it could make a lucky guess and beat everyone else mining?

Or, is that absolutely impossible?

I'm thinking about trying my luck at this (without joining a pool) (for fun) if it is possible. If impossible, then please explain why.

**Tags:** mining-profitability

> **Comments:**
> **username_1**: It is possible that the very first hash it tries could be successful, and then it "earns" 12.5 BTC for a few seconds of work.  However, the odds of that happening are roughly larger than the age of the universe.  
> **username_2**: @username_1: "the odds of that happening are roughly larger than the age of the universe". Ever heard of [dimensional analysis](https://en.wikipedia.org/wiki/Dimensional_analysis)?  
> **username_3**: Possible duplicate of https://bitcoin.stackexchange.com/questions/24185/lottery-mining  

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## 2 answers

### Answer by username_5 on 2017-12-16. Score: 7 | Accepted answer

It is *theoretically* possible.

Blockchain.com estimates that the [hashrate](https://blockchain.info/charts/hash-rate) of bitcoin is 13,000,000,000,000,000,000 hashes/second. Any one of those hashes could be "The lucky one" that earns 12.5BTC. Your [CPU](https://en.bitcoin.it/wiki/Non-specialized_hardware_comparison#CPUs.2FAPUs) can get on the order of 2,000,000 hashes/second (plus or minus). This means your computer has roughly a 1 in 65,000,000,000,000 chance of being the lucky one that mines the block. The remaining 64,999,999,999,999 times, it's someone else (typically someone with a huge ASIC rig). If you mined for a billion years, you could actually *expect* to mine a block (using "expect" as in the statistical "expectation" of a random variable).

A bitcoin block is mined roughly every 10 minutes. At $20k per bitcoin (extrapolating a bit, based on its current excitement), that's $250k generated every 10 minutes. You have a 1 in 65,000,000,000,000 chance of being that one. Accordingly, your expected earnings (due to that random luck chance of getting the right chance) is .0000003846 cents/10minutes, or .0000023 cents/hr. If you are spending more on electricity than that, you're wasting your money.

> **Comments:**
> **username_6**: Mathemagician! !  

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### Answer by username_4 on 2017-12-16. Score: 10

It is of course possible... however it is **incredibly** unlikely!

Mining with a CPU has not been profitable since the earliest days of bitcoin, the expected time to find a block is likely on the order of centuries at this point, and by that time you'll have burned much more in electricity costs than the eventual block reward.

So, as an experiment you could try, but if it costs you even just $5 worth of electricity a month, you would **actually** have better odds spending that money on a lottery ticket!


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