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6861  Bitcoin / Development & Technical Discussion / Re: Bitcoin As An Eternity Service on: May 14, 2011, 05:08:54 AM
You can't prune unspent 0-value outputs because they can be redeemed, even though this would be useless. You can't necessary prune unspent known-to-be-data outputs because the script can both contain data and be redeemable.

Detecting data transactions based on entropy would be error-prone, since true randomness has a chance of being apparently low-entropy.

Deleting redeemable outputs is dangerous, since you could end up in a situation where you need the output to verify a block, but none of your peers has it. No matter what you do with the block, you might end up on a separate chain.
6862  Bitcoin / Development & Technical Discussion / Re: Possible attack: Difficulty DoS on: May 14, 2011, 04:45:53 AM
If we really got stuck that badly, a new version of Bitcoin would be released that changed the difficulty rules. I doubt it will ever be necessary, since an attacker would need a ton of computational power, and the build-up of transaction fees would incentivize increased mining.
6863  Other / Off-topic / Re: MySQL Help Requested... on: May 13, 2011, 05:27:45 AM
With PostgreSQL you could do this:
Code:
SELECT users.name, count(CASE WHEN (feedback.type='positive') THEN 1 ELSE NULL END) AS positive, count(CASE WHEN (feedback.type='negative') THEN 1 ELSE NULL END) AS negative FROM users JOIN feedback ON (feedback.name=users.name) GROUP BY users.name;
I don't know if that would work on MySQL.
6864  Bitcoin / Development & Technical Discussion / Re: AES difference between a key and password on: May 12, 2011, 04:59:30 PM
AES-256 needs a key of exactly 256 bits (128 bits for AES-128, etc.), so you often need to lengthen the password. It's also good to make a key of random bits instead of just ASCII text. So you hash the password with SHA-128/192/256, get 128/192/256 bits of "random" data, and use that as the key. Salting prevents the use of rainbow tables, and using multiple hash iterations slows down brute force attacks against the password.

If your password is somehow already exactly key size bits of random data, then you can use that as the key directly. One example of where this is useful is when you're encrypting a swap partition on Linux: the key can come directly from /dev/urandom, since no one needs to know it.
6865  Bitcoin / Bitcoin Discussion / Re: live now - Gavin on twist on: May 11, 2011, 08:46:24 PM
The show could have been very good if the hosts would have moderated the discussion so that Gavin had a chance to speak. Genjix is very good at building excitement -- we just need Gavin to balance that out with some reality.

Gavin interrupted more than I would have been able to... I hate these kinds of situations.
6866  Bitcoin / Development & Technical Discussion / Re: Block size limit automatic adjustment on: May 11, 2011, 11:54:57 AM
What's the current failure mode? What happens if the existing Bitcoin client encounters an over-long block?

It is considered invalid and rejected.
6867  Bitcoin / Bitcoin Discussion / Re: What are you going to do, when (if) bitcoin hit $1000/BTC? on: May 11, 2011, 11:33:32 AM
It Bitcoin hits $1000, I will try to attract a small group of freedom-loving Bitcoiners to buy an island that's big enough for us all, and on which we can install high-speed internet.

If we can get very high-speed Internet, count me in!
6868  Bitcoin / Bitcoin Discussion / Re: What are you going to do, when (if) bitcoin hit $1000/BTC? on: May 11, 2011, 07:58:42 AM
I'd use it to make more money. Probably I'd start a business or two.

I can't think of many luxury things I want, though I have always wanted an ISP-level Internet connection with a large block of IP addresses. Once I become even more rich, I might buy an island.
6869  Bitcoin / Bitcoin Technical Support / Re: Sending to unused/unkown addresses on: May 10, 2011, 04:55:47 AM
Is the address somehow derived from the public/private key? Or is it independent?

It's the hash of the public key, plus some other stuff. You can't create arbitrary addresses.
6870  Other / Meta / Re: kiba going crazy with the moving??? on: May 10, 2011, 03:52:50 AM
OPs can move their topics back if they disagree with moves. Then we can have a discussion about whether it was appropriate.

A few of kiba's recent moves were unnecessary, IMO. I try not to move topics unless almost all people would agree with my categorization.
6871  Bitcoin / Bitcoin Discussion / Re: [RFC] New TX fee: 0.0005 BTC on: May 10, 2011, 03:01:31 AM
That got me thinking. If we can come up with a list of likely attributes of spam transactions, perhaps the client could identify the likelyhood of a transaction being spam. Then, if that likelyhood (expressed as a number between 0 and 254) is greater than a random number between 0 and 254, the transaction is thrown out as spam.

This is also how I think the spam problem should be solved for relaying. A drop probability should be weighted by fees and priority. If the transaction is important, it will be resent.
6872  Bitcoin / Bitcoin Discussion / Re: What's the largest transaction fee you were asked to pay? on: May 09, 2011, 07:15:22 AM
Have you sent anything recently however? Using the latest Bitcoin client?

I send transactions all the time, though I'm still using 0.3.15 on my main wallet. This doesn't have the priority requirement, and the size limit for a required fee is higher. I do manually add a 0.01/kB fee for important transactions.
6873  Other / Meta / Re: [applaud]/[smite] system? on: May 09, 2011, 04:12:45 AM
At least in my Firefox, it freezes up without the following include/exclude

// @include        *://www.bitcoin.org/smf/*
// @exclude        *://www.bitcoin.org/smf/index.php?board*
// @exclude        *://www.bitcoin.org/smf/index.php
// @exclude        *://www.bitcoin.org/smf/
// @exclude        *://www.bitcoin.org/smf

But now it's wonderful.  Thank you for making that!


Sorry. I thought I tested for stuff like that...

I added those excludes, plus some more checks:
http://pastebin.com/5aTU768g
My post is updated.
6874  Bitcoin / Development & Technical Discussion / Re: [RFC] Continuous block reward decrease on: May 09, 2011, 03:48:15 AM
Does your algorithm easily handle increases in precision like the current system does?

I don't like that the end state would be changed. People signed up for particular rules. The end total BTC is very similar, but 132 years -> 93 years is significant.
6875  Bitcoin / Bitcoin Discussion / Re: What's the largest transaction fee you were asked to pay? on: May 09, 2011, 03:41:18 AM
I've never been asked to pay a fee.
6876  Other / Meta / Re: Huge amount of moved-thread spam on: May 09, 2011, 01:51:39 AM
They're locked, so they'll get pushed to the bottom eventually. I think it's better to create the redirection threads than to leave people confused about where the threads went.
6877  Other / Meta / Re: Marketplace Regulation on: May 09, 2011, 12:37:57 AM
I created subforums.

Topics will remain in the outer marketplace section if they don't fit neatly into one of the subforums. For example, an announcement of a new exchange would go in the outer section.
6878  Other / Meta / Re: Russian forum size misrepresented. on: May 09, 2011, 12:26:11 AM
For people scanning the counts, the existence of so many subforums might be a clue that the count is wrong.
6879  Other / Meta / Re: [applaud]/[smite] system? on: May 08, 2011, 05:05:29 PM
I pay 10 BTC for a Greasemonkey or Firefox plugin that hides the ratings completely.

Here you go:
http://pastebin.com/5aTU768g
6880  Bitcoin / Development & Technical Discussion / Re: Why is bitcoin.org using a self-signed SSL certificate... on: May 08, 2011, 12:44:46 AM
And controlling the server you can control where those emails get delivered Wink

There are already MX records, though, which I believe would override the A record in mail delivery.
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