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6841  Bitcoin / Development & Technical Discussion / Re: Hostnames instead of IP Addresses on: June 03, 2010, 02:56:19 AM
How about $ ? It's distinctive, allowed in URLs, and related to money. You could also surround the authentication address in parentheses to emphasize that coins should not be sent to that address directly.

I really like that authentication method.
6842  Economy / Trading Discussion / Re: For a website taking payments with bitcoins, better: IP or bitcoin addresses? on: May 30, 2010, 02:39:14 PM
Quote
But a man in the middle can also intercept the key negociation for OpenSSL and decrypt the packets.

If authentication is handled perfectly, this is nearly impossible.

Quote
forging hashes

This is even more difficult than breaking TLS. If you don't trust cryptography, why are you using BitCoin? The authentication I'm talking about is extremely similar to the core technologies that make BitCoin work.

Right now it's trivially easy for your ISP to steal all BitCoins sent to an IP address. It's possible (and probably not too difficult) to make this very non-trivial. Why on Earth would we not do this?
6843  Economy / Trading Discussion / Re: For a website taking payments with bitcoins, better: IP or bitcoin addresses? on: May 30, 2010, 01:04:18 AM
Quote from: gavinandresen
I don't see the security risk of being able to intercept or eavesdrop on a Bitcoin transfer.

When sending to an IP address, BitCoin contacts the IP address without any authentication/encryption and requests a new BitCoin address, which is also sent back in plaintext. You then send the BitCoins to that address in the normal way. A man in the middle can intercept this request and send back their BitCoin address. You will then securely transfer BitCoins to the wrong person.
6844  Economy / Trading Discussion / Re: For a website taking payments with bitcoins, better: IP or bitcoin addresses? on: May 29, 2010, 12:38:42 PM
It's not just an issue with proxies. Since there's no authentication, any "man in the middle" can intercept your BitCoin transfer, including your ISP and other people on your wireless connection. It's like logging into your bank's website without HTTPS.

BitCoin should use an authentication method like SSH: the receiver signs the BitCoin address and other info with a permanent public key, the hash of the public key is displayed to the sender before any transfer, and the receiver makes this hash known through other trusted channels.
6845  Economy / Marketplace / Re: BitCoin Casino (Beta mode) on: May 28, 2010, 01:10:39 PM
Quote
What's the char code/html code of such character?!

฿ - Thai currency symbol Baht

In blackjack, the game died when I split a hand and won blackjack on both. It's probably a bug for the game to even give me that; the odds are astronomical.

Also, Aristocrat Slots seems to be giving out way too much money. I've found it to be reliably (though slowly) profitable; I've made at least 500 BC from it already (and then lost it all on other games...).
6846  Bitcoin / Development & Technical Discussion / Re: Tracing a coin's lineage on: May 27, 2010, 12:14:07 AM
You'd send the coins to an address owned by yourself. So you lose nothing. It's impossible to tell that you're sending the coins to yourself. There's no need for a "random payment limit" -- "laundering" even your entire wallet at once would be harmless.

Choosing random addresses will not be enough, I think. Fiat-to-BitCoin exchangers will always be an "anchor of identity" to a coin, since they know both the identity of the person buying coins and the destination address.
6847  Bitcoin / Development & Technical Discussion / Re: Tracing a coin's lineage on: May 26, 2010, 03:39:50 AM
BitCoin could automatically send random coins to a new address at random times. This would make knowing a coin's lineage useless to an attacker, since any of these new addresses could be actual people.
6848  Bitcoin / Development & Technical Discussion / Re: Recovery after hard drive failure on: May 23, 2010, 01:20:20 PM
This should be fixed in SVN.
6849  Bitcoin / Development & Technical Discussion / Re: Could the bitcoin network be destroyed by someone generating endless bitcoin add on: May 09, 2010, 05:34:57 AM
Generating addresses is CPU-intensive, and you don't touch the network when you generate a new address. It could only cause damage if a non-unique address was created, but this is so unlikely that it's not even worth considering.
6850  Bitcoin / Technical Support / Re: Ummmm... where did my bitcoins go? on: May 04, 2010, 02:16:16 AM
No.

Quote from: BitCoin paper
It is possible to verify payments without running a full network node.  A user only needs to keep a copy of the block headers of the longest proof-of-work chain, which he can get by querying network nodes until he's convinced he has the longest chain, and obtain the Merkle branch linking the transaction to the block it's timestamped in. He can't check the transaction for himself, but by linking it to a place in the chain, he can see that a network node has accepted it, and blocks added after it further confirm the network has accepted it.

So you would only download the most recent 200 or so blocks and then new blocks as they come in, relying on the network to verify the blocks for you. It would be a really lightweight way to use BitCoin. It would even be useful for "full network nodes" as they are downloading the whole block chain.

Congrats on 100 posts!  Smiley
6851  Bitcoin / Development & Technical Discussion / Re: On IRC bootstrapping on: May 03, 2010, 10:22:23 PM
TCP doesn't work with multicasting. And I doubt it will ever be easy for a home user to join a multicast group.
6852  Bitcoin / Technical Support / Re: Ummmm... where did my bitcoins go? on: May 03, 2010, 06:19:19 PM
The BitCoin paper mentions "simplified payment verification" that could be used to accept payments without downloading all of the blocks. I don't know if this is implemented yet. It might only be enabled for clients that have "generate BitCoins" turned off.
6853  Bitcoin / Bitcoin Discussion / Re: Since 20th April my coins is generating MUCH more slowly, WHY? on: May 03, 2010, 03:23:19 AM
Difficulty increased by a lot.

Quote
GetNextWorkRequired RETARGET
nTargetTimespan = 1209600    nActualTimespan = 825067
Before: 1c20bca7  0000000020bca700000000000000000000000000000000000000000000000000
After:  1c16546f  0000000016546f575ab277f44c118de5ab277f44c118de5ab277f44c118de5ab

The target decreased by 31.79%, so you should be generating 31.79% fewer BitCoins.
6854  Bitcoin / Technical Support / Re: Ummmm... where did my bitcoins go? on: May 03, 2010, 01:18:23 AM
Did your new installation finish downloading all of the blocks (currently about 54,200)? The transaction probably won't appear until it does.
6855  Bitcoin / Bitcoin Discussion / Re: Proof-of-work difficulty increasing on: May 02, 2010, 09:03:51 PM
Your CPU is creating SHA-256 hashes. It's not possible to cheat: if the hashes you create are invalid, no one else in the network will accept them. If you inject a 50,000-block chain of "easy blocks" into the network, everyone will immediately see that the hash for the first block in the chain is above the current target and ignore it and every block derived from it.
6856  Bitcoin / Development & Technical Discussion / Re: Number of connections on: April 27, 2010, 03:20:46 PM
Difficulty just had a huge jump from 7.8% to 11.5% -- likely the biggest jump so far. Link2Voip sent out an email promoting BitCoin, so maybe they're responsible.
6857  Economy / Marketplace / Re: New exchange (Bitcoin Market) on: April 25, 2010, 12:52:38 PM
PayPal payments can be easily reversed. Unless an irreversible system like Liberty Reserve is used, it would be better for you to handle the payments.

Does BitCoin Market fill orders partially if the entire amount is not available?
6858  Bitcoin / Development & Technical Discussion / Re: Building a Dedicated Super 'Node' - Crypto Accelerator Cards etc. on: April 16, 2010, 05:31:10 PM
Neither of those cards support SHA-256.

I would want to test several CPUs to see which has the best hashes-to-watts ratio. I suspect that a few modern CPUs would actually be better than a lot of old ones, but I'm not sure. All each node would need is a motherboard, CPU(s), and 512MB of RAM. They can boot from the network.
6859  Bitcoin / Bitcoin Discussion / Re: Starting a new proof-of-work chain on: April 15, 2010, 12:31:27 PM
Deflation isn't a big problem because coins are very divisible. If only 5 coins remain in the system, people can just trade in 0.0000001 coin increments or something.

Proofs-of-work can't be reused like that because they are hashes of a particular block's contents.
6860  Bitcoin / Technical Support / Re: CentOS error on: April 14, 2010, 09:44:57 PM
Did you try "LD_LIBRARY_PATH=/usr/lib ./bitcoin"? Are you sure libcrypto.so.0.9.8 actually exists?
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