Mining Bitcoin with pencil and paper: 0.67 hashes per day
righto.com
righto.com
7 000 000 000 humans * 0.67 hashes per day = 4 690 000 000 hashes per day (or 54282.4074074 per second)
54282H/s would give us a daily profit of: 0.00078760 BTC ($0.30)
So when the evil space aliens conquers the human race, they can put us to good use to generate 30 cents worth of Bitcoins for them every day (not counting human electricity cost aka food).
So your estimate of 30 cents a day is wildly optimistic.
Also of your 7 billion, I'm not sure how many are mentally incapable of doing such work (maybe they are really old or really young, etc).
http://www.theepochtimes.com/news/7-1-11/50336.html
Given that the output conditions for a Bitcoin hash are essentially a limited form of preimage attack, I wonder if this "human uses properties of hash function to reduce the problem space, lets the machine bruteforce the rest" method could have any advantage. Machines are great at doing operations quickly, but human brains tend to be far better at noticing patterns and using ingenuity.
You mean:
http://www.righto.com/2014/02/bitcoins-hard-way-using-raw-bi...
Also this one:
http://www.righto.com/2014/09/mining-bitcoin-with-pencil-and...
Didn't you just link to the main target of this post?
Do the chips still run this plain vanilla sha256 algo, or have they found some steps that can be skipped? Things like not calculating the final steps if you notice that there won't be enough zeroes.
My version had considerably lower resolution, though, since I used quarter-inch grid paper at 8.5x11", so it was 0.125 units per square. :)
Meanwhile, look what I just found while verifying my memory that the core set fits in y = +/- 2.0:
You can interpret the squaring and adding as geometric operation to be done with ruler and compass. If I'm not too lazy, I might write a blogpost about how to do it.
I've used the geometric route for drawing Julia sets, but I don't know how you would do that for the Mandelbrot set, what with a different constant being added for each point and all.
I just can't think of a good way to generate CAPTCHAs (or something similar) from a block in a fashion that would give human beings a significant edge over computers.
That is one idea intro CS students certainly should get used to, as I've found that manually executing algorithms is good for debugging and learning too.
made my day !
Working out any algorithm by hand first (even though you might not complete all the steps) was how we approached learning in college.
We tried to draw Mandelbrot set 'manually' at university. It included some alcohol so napkin with results got lost.
(We did RSA by hand at my university, and RSA is an obviously mathematical algorithm; to this day, I still don't understand how RSA could be patented in the USA.)
You know, it where the golden 90s. Startups did all kind of crazy stuff. Paint their walls pink and what not. We had the wildest parties. The CEO often brought in a bunch of prostitutes and hired well known DJs.
The days of the week with the "no computer" rule slowed down things unbelievably. And has been abandoned after the founder has been kicked out of his own company. To my surprise, it did not kill the company. The company strives on to this day.
The manager answer the door and tells the police that the employee misunderstood, and he'd merely hired dancers for the night. That guy doesn't have a job anymore, and no one is going to get in trouble with the cops.
The only way to be sure that they're prostitutes is to actually have a transaction with one, which if you go to the police about, are more likely to get arrested for than anyone else, since you're the only proven john.
You can be fairly direct with later deniability, and there's an incredibly high cost to being the guy that called the cops.
Why do you think drug use at start-ups is so common, even at work sponsored events?
I've seen off-label pill use, marijuana, and cocaine at work related events (or just casually around the office) in at least 5 states, ranging between the West Coast, the East Coast, and Texas. The settings have ranged from small companies and start-ups (which have the most drug use openly) to large corporations like Microsoft (where people at least hid in the bathroom or private areas while doing lines). Marijuana is the most prevalent that I've seen, at 8 different states and between widely varying social groups.
I've even been offered ADHD meds not prescribed for me by senior people at the company I worked for at the time, to keep me working long hours and more focused at work. (Hey, if it works for college kids, it works for adults.)
The simple answer is that not everyone agrees with laws against vices, particularly things like prostitutes and drug use - and see no reason to follow them.
If you're not aware that things like this happen, you probably give off the impression that you'll try to get people arrested and seriously damage their lives because they take an intoxicant you were told was bad, rather than alcohol or any of the various other legal ones.
tl;dr: It's all over, and if you don't see it, people are actively hiding it for you because they don't trust you to make reasonable choices.
Where I work, most official work events are set up to allow employees to bring in their kids. I believe most people would not do lines in front of preteens. What people do in private is another thing entirely.
This has been my impression of work parties as well.
I think I omitted it, but the context to my reply was more of a late-evening-with-drinks party than a good-for-the-family party/event.
It's legal where this party was (Germany), though that's not to say it doesn't happen in countries where it isn't legal.
Source: http://www.theguardian.com/world/2011/may/19/sex-party-rewar...
There's a certain high-level manager at a Valley startup. His team just launched. Everyone's high. Super-buzzed. Nice party. I have a little printed crib-sheet. John. 43. B-school. Wife left. Couldn't handle being a married single mom. Has visiting rights to his daughters, but doesn't have time to exercise them.
It's my job to go home with him. Make it all worth it. Usually these guys are into wife-play. As in, I play the role of their ex. Give them a taste of a still-sizzling marriage for a night. "New honeymoon vibes" is what my boss calls it.
Basically a tailored prostitute for guys who royally fucked up their personal life. Because that's how the modern startup views itself: a family surrogate, and I'm just another extension.
It's not just advertising. I'd wager it happens many if not most places where there are contracts to be awarded or specific talent to be retained.
I'd imagine that the folks expressing disbelief are either inexperienced or so obviously 'square' that they're kept totally in the dark about such things.
I've seen one place where it was nearly a standard of 'culture fit'.
Note: I don't mean to condone this sort thing, just to bear witness to its prevalence.
I hope that I'm wrong, but I'm suspicious about what happens in there.
So, while a massage room might have windows, if it does they almost certainly would be covered completely when in use. So no windows isn't odd for a massage room.
They're 67 quadrillion times more expensive, but they're all natural and locally-sourced.
Thanks for understanding.
The productive thing would have been to simply ignore them and move on, if you had nothing relevant to add.
I mean, sure, we don't want it to be like Reddit, where it's a race to post the cleverest puns, but a chuckle once in a while shouldn't be frowned upon.
The "funded by Kickstarter" adds another dimension to this artistic masterpiece.
EDIT: Actually that got me thinking - that would be a really good art piece, if you could get them to do something fully self sustaining. There's no reason for them to stop if they're getting paid properly - it's just another task. It's just this weird loop of useless work being done, but still sustaining people's lives. It makes you think about the nature of labor and money.