Yup, in 2009 you could have developed a mining software that could be run on about any recent device (albeit, at that time, smartphones were still really new, but you might have had a couple android phones that could have mined over wifi). Offcourse, you would also had to have developed all other infrastructure... Port bitcoin core for android, patch it so you could use a seperate mining software,...

https://en.bitcoin.it/wiki/2009

The difficulty rose from 1 to 1.18 in december 2009... At those difficulty levels, most recent cpu's would be able to solve a block from time to time. On a cellphone, you probably would not solve  dozens of blocks per day, but i'm pretty sure you'd be able to solve a couple each day. Offcourse, cpu's in smartphones in 2009 might not have been powerfull enough to really solve a lot of blocks, but i'm pretty sure they'd hit a block from time to time.

And yes, you could easily create a new altcoin that uses a new POW algorithm for which at this moment in time, no asic's exist. Hundreds of people have tried though, and most of those altcoins are long gone...

bitcoin was not as complicated as it is now than before. What was needed to complete a transaction was very little but obviously with how popular bitcoin has gotten now, it has become more complex and difficult to mine and you need very sophisticated specific software and hardware to mine bitcoin.

But don't forget that the difficulty level of mining bitcoin back then matched the capability of devices. Cellphones back then were not even as half as good as the ones we have now so I don't think it was possible.
Theoretically maybe yes but realistically speaking, it would be too much work not only in the technical aspect but just about the community as a whole

But we also have to consider the fact that the Bitcoin network wasn't massive then compare to now. The difficulty level wasn't too complex, meaning linking up with the Bitcoin network then didn't require much power and and internet connection, which I think the modern day device can compete well.


The modern day device are quite advanced and have made so many upgrades. with the upgrade in internet connections, RAM, ROM, battery life, clock speed and others. So practically, it would have been possible for smart phones to compete. But there must be prons and cons attached.

2009 = ARM Cortex-A8 at around 600 MHz to 1 GHz clock, so let's take 800 MHz for our purpose.

With a well optimized implementation of SHA-256 we are looking at 53,000 Hashes per second.

Block reward in that year was 50 coins per block and difficulty remained at 1 from 2009 to 2010.

The maximum possible number of coins to mine per month: 144 blocks per day * 50 reward = 7200 coins per day * 30 days = 216000 coins

Here is a calculator you can put numbers in:
https://99bitcoins.com/bitcoin-mining/calculator/

According to it you would find 1 block on average per day (50 coins).

You could buy old phone for close to nothing and fork Bitcoin to see the actual numbers if you manage to find mining software for it.
Worst case scenario you could run web mining on that phone and check that, there are plenty JS implementations on GitHub.

Or just run it on the main Bitcoin chain and just see the performance.

If you want to mine with regular CPU (x86/ARM), RandomX algorithm based projects are for you.
There are no ASIC's for it and probably won't be because to make one you would have to build almost a full blown CPU which kills the profits of any ASIC manufacturer as they are unable to compete with Intel AMD.

That's correct... And next to this, even in 2009, a desktop (or server) cpu would have greatly outperformed a mobile cpu... So, even back then, it would have been better to mine with your pc's cpu than it would have been to mine with your brand new, first gen, very expensive smartphone.

If you had to go back in time to 2009, it might have been a better idear to have bought a decent desktop pc with one (or more) good GPU's and "invent" GPU mining... The technology was there, you would have needed to patch bitcoin core to allow the rpc calls needed to mine outside of the bitcoin core process and you would have had to write software to mine with your GPU...
If you would have tought of this in 2009, you could have been a billionaire right now

sigh... hindsight...

You would be a billionaire either way if you made a small CPU farm before GPU mining began and kept stacking without selling.

But even back then it was more profitable to just buy coins.

People were trading on old forum, peer to peer (as it was designed) without centralized exchanges.

Usually by facilitating PayPal (yeah I know, F cancer).

Genesis block was hardcoded into the software, due to it's nature it couldn't be otherwise.

BTW, why do you guys have this gambling junk advertisement ? do you get paid to advertise this useless shit ? or is it your business ?
It seems some people talk just to advertise it without adding anything to the conversation.