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961  Bitcoin / Technical Support / Re: bitcoin-qt falls back to 8 connections after some time on: July 18, 2013, 06:42:01 AM
On my DSL connection, if my ip gets changed (usually pppoe reset), the connection count will drop to 8. Probably has something to do with the client not updating its external IP. The only real solution is to prevent your internet from dropping out. If you think your ISP is blocking bitcoin, an external port scan on TCP 8333 should tell if it's really the case.

That appears correct, the code in net.cpp GetMyExternalIP seems only to be called upon startup. External IPs changing on an always-on connection should only affect a few users, perhaps a command line option to enable periodic polling of external IP would be the solution, so not everyone is hammering external IP service providers unnecessarily by default.
962  Bitcoin / Technical Support / Re: Will 256 mb usb be enough to hold a LITE client ? on: July 18, 2013, 05:47:09 AM
You can certainly store a wallet file on that size of USB, however a bootable OS with a lite client would be a stretch. One could start with tiny core linux - then install extra software on it.

If you want to sell them, just sell them as 256MB drives, you don't need to make promises about what people can do with them.
963  Bitcoin / Development & Technical Discussion / Re: Forking scenario - when border connections are closed on: July 17, 2013, 10:47:11 PM
It would only take one person smuggling a blockchain copy on a USB flash disk across the border to catch everybody up in censor-stan. Spending money (smuggling out transactions) would be a bit harder though; you'd have to get out a hibernated laptop with cached transactions or such.

The mining power of an isolated area would be much less than the rest of Bitcoin, they would only need to know to not trust payments in any locally mined blocks if they happen during isolation.

Deepceleron's razor #17: If something is worth saying to a noob, deepceleron has probably already said it.
964  Bitcoin / Bitcoin Discussion / POLL: How much blockchain data is filling your hard drives? on: July 10, 2013, 09:55:37 PM
I just did a hard drive cleanup, and realized I had tons of copies of the blockchain from different stuff - multiple datadirs, virtual machines, pynode, torrent & torrent bootstrap candidates, zipped up copies, multiple computers, etc.

You should have a backup of an updated blockchain if you use a full client though (just copy the whole Bitcoin datadir with subdirectories except for the wallet) - it will save you a lot of re-downloading or importing in case your Bitcoin craps the bed.

How much blockchain bloat are you storing?
965  Other / Beginners & Help / Re: How to use at best what i have on: July 10, 2013, 09:18:38 PM
Sell it on eBay or craigslist for $40, buy 0.5 BTC.
966  Other / Meta / Re: Activity & new membergroup limits on: July 10, 2013, 08:50:42 PM
I vote for a rule that takes off points for every necro bump. The older, the more points disappear.
Over 30 day bump, -1. Over 120 day bump = -2, over 365 day bump = -3, etc

Then we take off a point for every post above a threshold considered excessive spamming:
48 posts in previous 24 hours
24 posts in previous 6 hours
12 posts in previous 1 hour

Applied retroactively.

6 posts in two minutes = banhammer. The obvious post whores who don't read anything.
967  Bitcoin / Bitcoin Discussion / Re: Question about possible bitcoin hack on: July 10, 2013, 12:20:11 PM
First, what the heck is a "FUD keylogger". You are misusing words you heard somewhere.,_uncertainty_and_doubt

Secondly, a 51% attack has nothing to do with acquiring Bitcoins. It has to do with gaining a majority of the hashrate that secures the blockchain (mining), which would allow you to erase blocks or transactions in the blocks, containing payments that others may already have trusted. One doesn't even need 51% if the goal is just to occasionally cause orphan blocks.

The "biggest threat" is not 51% mining attacks; the Bitcoin blockchain is secured by an extreme amount of processing power, and there is small profit opportunity available for executing one. The biggest threat is entrenched bankers and their bought-and-paid-for governments continuing to discourage and harass legitimate businesses by freezing and seizing the fiat currency accounts necessary to exchange money in a non-homogenous currency environment and criminalizing the use of non-sanctioned non-centrally controlled money in various ways.
968  Bitcoin / Development & Technical Discussion / Re: Bitcoin-QT Feature Request on: July 09, 2013, 11:56:35 PM
Help -> "Debug Window" -> "Console" tab. Type listunspent. You will see every unspent payment individually.
969  Bitcoin / Technical Support / Re: Download Old Versions of Bitcoin-qt - Please Help on: July 09, 2013, 11:42:57 PM
You may wonder where old binaries went....:

I removed the old binary releases from SourceForge because it was getting annoying to find things like testnet-in-a-box in that very long list, and also getting hard to see what the latest release was. And with our gitian reproducible build process, the windows/linux binaries for recent releases are deterministically reproducible from the source code.

See  for the history back to the 0.1.5 release....

0.3.24 was the last of the 0.3.x series
970  Other / Beginners & Help / Re: how to install bitcoin-qt in different directory (debian - linux)? on: July 09, 2013, 11:39:37 PM
bitcoin-qt -datadir=/differentdirectory
971  Bitcoin / Development & Technical Discussion / Re: Vanitygen: Vanity bitcoin address generator/miner [v0.22] on: July 09, 2013, 03:01:36 PM
is there any solution up yet for using FPGAs / Ztex quads for vanitygen or similar?

I'd like to have 1madmax and some others but my workstation is just getting too hot.

If you want I could generate it for you. Submit an application to or see the OP and send me the necessary info.

tyvm, but I'd like to get vanitygen making use of my ztex, and generate those on my own Smiley
well, that's part of the fun factor for me.

no idea?
If you type FPGA into the search box while reading this thread, it will give you the answer, which is no. A bitcoin miner is computationally nothing like an address generator.
972  Bitcoin / Development & Technical Discussion / Re: Vanitygen: Vanity bitcoin address generator/miner [v0.22] on: June 28, 2013, 07:46:57 PM
btw I am finding vanity addresses aiming for with lower case are much harder to compute seemingly, 1 out of 58 I generated so far with vanitygen -i are lower first char.  I think there maybe a target range miscalculation in vanitygen that is discarding valid finds?  Clearly all start strings are possible because 1zzz finds lots and so does 1111.  The alphabet is [1-0][A-Z][a-z] and strings before 1QQQ are easier.  Except 1111 is harder.  I am not really understanding why this is.  OpenSSL doco says it uses big endian encoding.  And the base58 encoder seems to use the same convention, so you would expect restrictions on the most significant digit.  However that doesnt seem to be the case empirically.

The address is encoded as 0x1 || hash(160-bits) || checksum(32-bits) which is 193-bits.  Now log(58,2^193) = 32.9465 and 2^193/58^32 = 46.676 however the bignum is encoded big endian


The change happens at a particular address: 1QLbz7JHiBTspS962RLKV8GndWFwi5j6Qr

This is a result of how the 25-byte (50 digit hexadecimal) underlying hashes are converted into Base58 (represented by numbers and letters) addresses, and the different maximum values that can be stored in 25 base256 digits vs 34 base58 digits.

The Bitcoin address in it's native binary form (that you never see) is 25 bytes, it's parts are:
byte 0: Network ID Byte (0x00 for main bitcoin network)
byte 1-20: ripemd160 hash (20 bytes) of sha256 hash (32 bytes) of 0x04+public key (65 bytes)
byte 21-24: checksum: first four bytes of sha256 hash of sha256 hash of bytes 0-20 above

This would be 50 hexadecimal characters long (base16), with a possible digit value between 0-F - 24 bytes or 48 hexadecimal digits of random hash output, plus the beginning "00" byte.

We will ignore byte 0, it is always 0x00, and Base58 conversion always preserves this leading 0 byte by directly encoding it as a "1".

That means the "vanity" part of the address is generated by the first several bytes of the underlying ripemd160 hash

The minimum this can be is 0000000000000000000000000000000000000000 00000000.
The maximum value that this can be is FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF ffff ffff
(the extra 0s and lower case "f"s are the checksum part.)

Here are some sample addresses before and after the "wraparound" of the maximum hash value.



See how the 1QLa addresses are full length, but the 1QLc addresses are one digit shorter? That is because the only way to have an address starting at 1QLc or greater is by having a binary address that is 59x smaller. There are 59x less possible hashes that will generate a 33 character 1aaaa address than will generate a 34 character 1AAAA address.
973  Bitcoin / Bitcoin Discussion / Re: [ANN] Bitcoin blockchain data torrent on: June 24, 2013, 12:53:54 PM
I want to host the blockchain on a cloud server and then point about 50 raspberry pi's to it. Is there a way to do this?

1. Cloud server - no. To have even marginal performance, blockchain files would need to be on a local network drive. The blockchain database works much better on SSD than rotational hard drive. You would be using something much slower than a standard hard drive and sharing it with 50 computers.

2. Rasberry Pi, no. So much slower than a used $25 craigslist computer.

3. The blockchain torrent can be imported into one system's bitcoin-qt. The complete data directory (except wallet.dat) could be copied to other machines so you don't have import multiple times.

4. Then SOME of the blockchain files that never change could be moved to a network drive and replaced with symbolic links on the client filesystems. The only files that won't be changing are past BLK00001.dat-BLK00064.dat files in the blocks sub-directory. The most recent BLK000xx.dat file must not be copied to network, it will still be added to by the individual client bitcoins and must be local and unique to that bitcoin.

Your question appears to have nothing to do with the bootstrap torrent.
974  Economy / Auctions / Re: 2 letter premium domain name on: June 24, 2013, 12:28:28 PM
Yes ccTLD has geotargeting but does NOT play a role in ranking.

I provided a link to Google's information page so that you can read for yourself.
Click here now:

Quote from: from the page you didn't read
If your site has a generic top-level domain, such as .com or .org, and targets users in a particular geographic location, you can provide us with information that will help us determine how your site appears in our search results. This will also improve Google's search results for geographic queries. This data supplements our existing information, and setting a geographic target won't impact your appearance in search results unless a user limits the scope of the search to a certain country. See a full list of domains Google treats as generic.

Sites with country-coded top-level domains (such as .ie) are already associated with a geographic region, in this case Ireland. In this case, you won't be able to specify a geographic location.

In case you can't parse even the above:

1. The geographic setting helps determine how your site appears in search results, and
2. You cannot change your site's geographic setting for ccTLD's in webmaster tools unless they are on Google's treated-as-generic list.
975  Bitcoin / Technical Support / Re: Send Bitcoins with Bitcoin-QT: What could I have done wrong? on: June 22, 2013, 01:32:39 PM
976  Economy / Trading Discussion / Re: SierraChart bridge - Realtime Bitcoin charts [v0.5] (MtGox, Intersango, ...) on: June 16, 2013, 02:16:12 PM
Delete everything Sierrachart from your system, and try this build:
977  Other / Beginners & Help / Re: HowTo: Jump-start Bitcoin installation download time with blockchain torrent on: June 14, 2013, 12:58:26 PM
so if i want to add extra mining rig, do i have to "download" the synchronizing again?
If you are pool mining, you don't need Bitcoin with a blockchain installed at all.
978  Bitcoin / Development & Technical Discussion / Re: Vanitygen: Vanity bitcoin address generator/miner [v0.22] on: June 11, 2013, 08:04:40 AM
The degenerate case where you just want an address appears to only work for Bitcoin.

but certain prefixes.  I can't generate Li (hashes a long time when it should easily find it), but I can do LiG easily.  For some reason Lig says the prefix is not possible, but it should be, right?

(lightcoin) Valid addresses are in the range: LKDxGDJ-LiZZFKc7

Base58 ALPHABET = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz"
979  Bitcoin / Bitcoin Discussion / Re: [ANN] Bitcoin blockchain data torrent on: June 10, 2013, 06:02:28 AM
When was this last updated?

block 216116, it is 240000+ today

I am assuming the compressed bootstrap.dat differs in the headers (1st MB) and whatever is appended at the end.
So I guess you need to byte compare the first chunk and the last chunk to check my assumption?

A file compressed with 7zip is a solid archive with a very large dictionary. Extracting any part of the file requires the data that came before it; essentially you must have the complete 7zip archive to extract data. A multipart 7zip archive is not independent files, the parts are just a binary split of the whole large archive file, and downloading later parts without the first part is useless. You must have all 7zipped compressed data in order to extract a verifiable bootstrap.dat.

A future torrent created with multi-part 7z files instead of one big uncompressed bootstrap.dat means that you could supplement your download or seeding by getting some of the torrent multi-part files off different websites where they might be hosted, and manually adding them to the torrent.

I am disappointed that 0.8.2 was released without a new checkpoint. Current block is 240709, I could force the issue by creating a block 0-240,000 bootstrap.dat torrent, if many would choose to adopt and seed such a torrent as a new "official" one. I'll see if Gavin is interested in picking a new checkpoint block yet with a code pull.
980  Alternate cryptocurrencies / Altcoin Discussion / Re: The .bit chrome extension beta is now available for download on: June 09, 2013, 10:21:36 AM
Hey guys I'm happy to announce that the .bit chrome extension beta is finally available for download. This extension allows you with a simple download to browse .bit domains! From what I tested it works perfectly but I'll be giving away 10 litecoins for each bug found with proof.
The first bug is that this is using someone else's DNS server; when you type in "mybitcoinwalletsite.bit" they could have changed it's IP destination to their login-stealing spoofing site. It is not documented what DNS gateway it uses.

To register .bit domains check out:
To register your own domains that you are in control of for 0.02 NMC, use the Namecoin client.
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