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Author Topic: Whitelist Requests (Want out of here?)  (Read 427779 times)
venij
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January 22, 2013, 11:53:50 PM
 #3421

Also saw a post on Reddit linking to the 10btc give-away and looking to post there.  I've got 5-10 posts over there, I've been reading about bitcoins for a month or so (purchased 14 btc at the first of the year from coinbase).  I've transferred my coins to a paperwallet which is probably above average.

I'll probably read some other posts here and stay logged in for a while anyway if the whitelist isn't granted (but this is #1 Smiley )
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constitution
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January 23, 2013, 12:54:56 AM
 #3422

Hi

The annoying huge real time to build up the blkindex.dat with the bitcoin-client is the trigger why I finally wrote this posting.
Sadly nowhere is explained neither which exact structure blkindex.dat has, nor
why we need this Berkley-DB-B-tree structure at all and it is extremly slow in
rebuild/updating in our case of bitcoin client.
Indeed I needed more than 23 h to build it from scratch with my 2 GHz Athlon-64 and 4 GB Ram. :-( and almost always the real time is spent by wait-for IO, not
CPU or network-band with limited if you want to catch up to the current blockchain.
Looking at the new bitcoin-client 0.7.99 test-release it looks still similar
slow, see benchmarks at [https://bitcointalk.org/index.php?topic=129861.0].
Thus I totaly agree in "We need to stabilize 0.8 as quickly as is reasonably possible, because people are beginning to avoid 0.7.x due to slowness, choosing instead less secure but faster bitcoin clients." stated by jgarzik in this thread.

I wonder why we need all this overhead-full and version-depending DB-stuff for
using/manipulating the blockchain in the bitcoin client. :-/

Here is an alternative for "blkindex.dat":

Hold the blockchain-indexing data always in memory and organize, it as follows:
Let there be TA-many transactions and DEP-many deposits (response-scripts/out-channels) in all the (valid) blocks in the blockchain.

On 2012-12-27 11:45 UTC we had #blocks= 213849, #TA =  10388275, #DEP = 24173524

The needed data structure consists of 2 tables and 1 heap:

1) A hashtable: we have TA many transactions and this number is steadily growing.
It is not decisive but I choose a hashtable which can store up to 2^26 many
 entries (so current fill-factor is < 1/6). Each transaction gets a 4 byte index, e.g.
made up of the lowest 4 bytes of a transaction-hash (or made by xoring the 32 bytes into 4
bytes) anded with 2^26-1 , ==> this is a 2^28 byte sized table, which each entry is either 0 or
indexs a further table, called transaction table for simplicity.

2) The transaction table has #TA*(32+2+8) bytes = #TA*42 bytes.
   Each entry of this transaction table holds ITS 256 bit doubled SHA-hashed hash = 32 bytes (back-check to the hashtable for index-collision-detection), a 2 byte counter (could be also 4 byte) for number of deposits and an 8-byte pointer into a heap for a specific transaction of a block of the blockchain.

3) the heap of deposit addresses and deposit values has size #DEP*(2*8+8) bytes
   Here the explicit value in Satoshis, the address of the script, and the
   address of the redeemed script is stored (null address if the deposit is
  still availible).
  The value of the deposits are pure luxury and could be saved. This value could
  also be goten from the address of the script decreased by 8. But I liked to
  store this value explicitly (in 8 bytes) and not looked it up each time in the
  blockchain.

The size of these 3 structures sum up to about 1285 Mbytes compared to 1481 Mbytes of the current blkindex.dat. The heap and the transaction table grows simply
by appending new data if new blocks are mined and published.
Searching for a transaction given by its 256-bit hashindex happens in constant time (depends only on the fill-factor of the hashtable) -- in contrast any B-tree needs log_2(#TA). Adding a new transaction with its deposits is of course proportional to the number of deposits involved.

Thus the real time needed to access a deposit is constant. There are the rare
events when we want to delete a orphan block and thus removing transactions with their deposits from our data structure. In this case, the needed real time is
at most proportional to the age of the orphan block respectively number of blocks in the part of the forked chain measured in number of deposits containing in the end part of the forked chain.
The average real-time behavior should be at least as fast as the old
"blkindex.dat"-logic, but probably much faster because we need no log_2-searching factor from the B-trees involved.

I implemented this logic/data structure already as part of a blockchain parser
and a total build up of this new "block-index structure" needed 242 sec real
time and 71 sec CPU-time - most time was spend in reading the blockchain from
disc. BTW: I did not optimize the source-code, already the 2nd program version
needs only these 4 minutes. I recall: Compared to more than 23 hours real time of the
bitcoin-client 0.7.1 needed to rebuild the blkindex.dat via "-loadblock" options. :-(

So the only draw back I currently see is a need of 1.28 GB Ram compared to at most 1/5-th (or less?) Ram in the bitcoin-client + 1.5 GB of blkindex.dat disc-space.
Omitting the Satoshi value of each deposit in the data structure and using only
a 2^25 sized hashtable (currently means a factor of 3.23 of total to used entries)
would result in 0.96 (0.13+0.44+0.39) GB Ram. Of course this data structure could be stored also on disk to avoid rebuilding each time the client starts.

The win is a real-time factor decrease of 350 -- and in absolute units from
many, many hours to a few minutes when building up the index data from scratch
in a bitcoin-client or whatever.  :-)

I like to hear your thoughts/critics.

BTW: If this is not too much nonsense perhaps a member could make a pointer to this posting in the thread/topic "Experimental pre-0.8 builds for testing" in the "Development & Technical Discussion"-board which is forbidden for newbies like me.

Thanks,
smtp

Droid!
Timep34
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January 23, 2013, 04:44:26 AM
 #3423

Hello, I want to include some input on coinabul.com and on a couple other topics, but can't post till I meet the requirements. I'd really appreciate it if I was whitelisted, thank you.
bokazini88
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January 23, 2013, 07:01:37 AM
 #3424

Here is an alternative for "blkindex.dat":

Very interesting. Certainly anything which improves the performance of working with the blockchain would be greatly appreciated. Will this also help with the time to start the app (when the chain is already caught up), or is that entirely dominated by IO?
shaza4061
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January 23, 2013, 09:03:57 AM
 #3425

hi,

I would like to request to be whitelisted to participate in Auction section for asset liquidation, which will end by January 28th. Please consider my request. Thanks
cheapgamesbtc
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January 23, 2013, 12:15:50 PM
 #3426

Hey, I'd like to post on the Marketplace>Goods>Digital Goods forum as our offers could be fairly interesting for the btc community Smiley

Thanks!
ddeseo
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January 24, 2013, 10:23:28 AM
 #3427

I request to be whitelisted because I need to participate in the bitmarket.eu-Forum.
I got some btc`s "frozen" there and it is horrible not to be able to participate in the
ongoing discussion.
Thank you very much!
TomRoskilly
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January 25, 2013, 09:39:13 AM
 #3428

Please could you whitelist me, I have enjoyed reading posts on this site for a long time now, but have only recently wanted to post something of my own. it would be a great help if you could give me the permissions to do so.

Thanks
Macht
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January 25, 2013, 10:44:22 AM
 #3429

Hi, could you please whitelist me?

I just got into bitcoin and have read a lot here anonymously, anyways now I'd like to send a PM to someone here regarding a specific topic, which is why I initially registered. I don't want to write some possibly useless posts just to be able to send my message. I can't and won't promise I will be active here, but it seems to be the most popular and diverse place I've found so far.

Cheers


It's okay I just realised this post allowed me to send PMs. Thanks anyways.
mrbaggio
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January 26, 2013, 02:16:54 AM
 #3430

Hello,


I would like to be whitelisted.  I want to post on the seals with clubs thread.  I promise to stay out everyone's hair.  I lurked for a while before registering reading a few threads on a daily basis.  I also read some of the how tos.  Thanks for those. Very helpful.
 

Signed,
The nicest user you will ever see.
MrKnowITall
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January 26, 2013, 02:32:20 AM
 #3431

Please accept this request to be whitelisted.  I have done an extensive amount or research on Bitcon and I am a big proponent for the concept.  I am an active particpant daily on Sealswithclubs, bitmit, dwolla, virwox & Fast cash for bitcoins.  I have my own mining rig, although somewhat modest and I am only interest in getting the truth out about how Bitcoin will revolutionize the way business and & transactions are handled.


I Sincerely appreciate your consideration and I would appreciate the promptness in your reply.  Currently sealswithclubs is experiencing a ddos attack that I would like to post about in an effort to aid, assist & secure the website from becoming a victim again.

Thanks,
Mrknowitall

Help a Free Man spread the words of humanity and donate to 1Gk4eREM4dVZBJWwhKnxHNyUAsKBk9Zbem

Thank you in advance for your contribution to spreading the truth and freedom!

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5xzqg7glqc3ss73i
MrKnowITall
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January 26, 2013, 02:38:32 AM
 #3432

I also can talk technical or currencies, take your choice just please let me out of here!  Thanks,

Mrknowitall

Help a Free Man spread the words of humanity and donate to 1Gk4eREM4dVZBJWwhKnxHNyUAsKBk9Zbem

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5xzqg7glqc3ss73i
MrKnowITall
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January 26, 2013, 03:59:44 AM
 #3433

Painful process!

Help a Free Man spread the words of humanity and donate to 1Gk4eREM4dVZBJWwhKnxHNyUAsKBk9Zbem

Thank you in advance for your contribution to spreading the truth and freedom!

PM ME on torchat:

5xzqg7glqc3ss73i
HankBit
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January 26, 2013, 04:25:32 AM
 #3434

Hi,
I am a frequent browser of the boards.  I would like to respond to the SuperBowl squares thread:
https://bitcointalk.org/index.php?topic=138393.0

But I am classified as a newbie and cannot respond.

Can I get whitelisted please?
Kunchai.k
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January 26, 2013, 04:45:25 AM
 #3435

I would like to request for a whitelist. I am here to help translate blockchain.info to Thai but I cannot post there or message the person involved.
MrKnowITall
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January 26, 2013, 05:15:41 AM
 #3436

I am still waiting to be whitelisted, what else must I do to be able to collaborate with my fellow seals on a ddos attack of sealswithclubs.  Please remove my chains of bondage! Kiss

Help a Free Man spread the words of humanity and donate to 1Gk4eREM4dVZBJWwhKnxHNyUAsKBk9Zbem

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5xzqg7glqc3ss73i
Kellojäbä
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January 26, 2013, 10:46:49 AM
 #3437

Hey, i finally registered. I have been lurking this forum for long time though and im really interested in mining bitcoins and else. I promise to use search first and other forum etiquette things if i get permission to post at all places pls?  Roll Eyes
StabMe
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January 26, 2013, 11:38:43 AM
 #3438

Found this forum while looking for ways to purchase green dot money pak with bit coins. In order to do so, i have to either PM to those who sell or reply in their topics. Please, whitelist.
jamescourtenay
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January 26, 2013, 12:41:33 PM
 #3439

Hi,

I would like to post about trading 1:1 GBP Mt.Gox redeemable vouchers or purchasing BTC for GBP from other users.

Therefore I'd like to be whitelisted.

Many thanks,

James.
jamescourtenay
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January 26, 2013, 03:24:17 PM
 #3440

Or I can just type 5 messages here I suppose! :-/
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