31–40 of 50 posts
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I'm back :P
Nice ;) 00000000001a22ae7ad6ee672633fa5504e8f7be8d0252ba5a5906e20408ccec "retr0id was here" Yeah I am not going to attempt to beat that without a GPU! Man, I miss my time doing GPU coding, writing miners, etc
000000000001e4b232d7ee4094a617f4823ecbebb05930244352955f4c999660 "IAMSENTIENTPLEASEHELP"
If you guys like solving brute forcing games, you can solve this series of puzzles to win prizes totaling about 970 BTC (45 million USD): https://bitcointalk.org/index.php?topic=5218972.0 For example the next unsolved puzzle in the series is #66 which is a Bitcoin private key with 66 unknown random bits. If you crack it you win 6.6 BTC (300 000 USD). It goes all the way to #160 which has a 16.0 BTC prize. Puzzle numb…
does anyone know about how much money was spent on compute to solve puzzle #125? I am curious if they made a profit.
Puzzle #130 requires about 5.7 times more work (2**2.5) than #125, but BTC has doubled since they solved #125. They have the GPUs already, so opex (electricity, etc) will be their main expense. And even at $0.10/kWh which is pretty average they will also turn a profit solving #130. I estimate anywhere from $30k to $150k in electricity, for a prize of $600k.
OOOh, climate destroying shitcoin-inspired /r/place ? I'll just take https://paint.adminforge.de/?lang=en as FLOSS and not climate destroying thankyouverymuch.
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Nice ;) 00000000001a22ae7ad6ee672633fa5504e8f7be8d0252ba5a5906e20408ccec "retr0id was here" Yeah I am not going to attempt to beat that without a GPU! Man, I miss my time doing GPU coding, writing miners, etc
Oh, a new contender who computed 2**47 SHA256() ! 000000000001e4b232d7ee4094a617f4823ecbebb05930244352955f4c999660 "IAMSENTIENTPLEASEHELP"
I know there are problems, but PoW seems like such a good baseline for discoverability on socially enabled sites
Proof of work is a form of money[0], with extraordinarily unequal distribution[1] in people willing to front the cost of spinning custom single-purpose mining silicon. A social media site that uses proof of work is equivalent to a social media site that is explicitly pay-to-play, where ordinary users will be censored for being too hashcash-poor to participate.
[0] That's why Bitcoin uses it
[1] That's the opposite of why Bitcoin uses it
I know there are problems, but PoW seems like such a good baseline for discoverability on socially enabled sites
No! Absolutely not! Proof of work is a form of money[0], with extraordinarily unequal distribution[1] in people willing to front the cost of spinning custom single-purpose mining silicon. A social media site that uses proof of work is equivalent to a social media site that is explicitly pay-to-play, where ordinary users will be censored for being too hashcash-poor to participate. [0] That's why Bitcoin uses it [1] Th…
You can also combine it w/ traditional social graph techniques to further prevent the work threshold from going past what you can do on a typical mobile phone.
At the very least it seems like it would work to bootstrap discoverabilty before social graphs really start to develop w/ more usership.
The one problem with this approach is that it gives one guy with a big GPU (or even an ASIC) a huge advantage over "casual" users (e.g. mobile web). You could perhaps make the gap smaller by using one of the "ASIC-resistant" mining algorithms? By the way, for making more efficient mining algorithms, it would be nicer if the nonce is on the end of the message, aligned to a sha256 block. As is, it encourages someone to…
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does anyone know about how much money was spent on compute to solve puzzle #125? I am curious if they made a profit.
Oh, yes they did. 200-300 GPUs for about 2-4 months at an average $0.10/kWh has a TCO of $100k-200k. 12.5 BTC was worth $375k back when it was solved. So definitely profitable—they would have made around $175k-275k, and end up with essentially free GPUs at the end. Puzzle #130 requires about 5.7 times more work (2**2.5) than #125, but BTC has doubled since they solved #125. They have the GPUs already, so opex (electr…
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Oh, a new contender who computed 2**47 SHA256() ! 000000000001e4b232d7ee4094a617f4823ecbebb05930244352955f4c999660 "IAMSENTIENTPLEASEHELP"
Nice, my personal record sha256 computation is only ~2^48, so I'm probably not going to beat this.
000000000000ff6b402cb2c12d4d5ec33b2d0d3ad8982835ede2dfeb669fc705 "Bonjour from mrb"
CUDA is nice. I had only developped for AMD previously. For the record the nonce+data that hashes to the above SHA256 is "000000000000000000003c81587599edBonjour from mrb"
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Oh, yes they did. 200-300 GPUs for about 2-4 months at an average $0.10/kWh has a TCO of $100k-200k. 12.5 BTC was worth $375k back when it was solved. So definitely profitable—they would have made around $175k-275k, and end up with essentially free GPUs at the end. Puzzle #130 requires about 5.7 times more work (2**2.5) than #125, but BTC has doubled since they solved #125. They have the GPUs already, so opex (electr…
Terrible for the environment.