Yes, please.

As author of the local bitcoin explorer, I think I have sufficiently proven I know what bitcoin is about.

- Jneb

Thanks to some helpful comments and requests, here is a new version of the local bitcoin explorer. Version number is 3.8.
Thanks to me being whitelisted, I can now moved this out of the Newbies forum. I hope I did it right.

New features (in reversed order of appearance):

• Shows the time difference between a transaction input and output (press <CR> twice at a transaction).
• Go to the block after a given date/time (special request from BitLotto)
• Faster printing of transactions for a given address (finally working correctly, thanks to a major rewrite of the Address DB)
• More helpful comments on the working of the address DB
• random address: return a random bitcoin address (next to random block, random transaction)
• categorise urls: show information about bitcoin clients on the network (there are five more categorise commands)
• Better output of scripts
• Dumping of raw script data
• Listen: Print a real-time abridged version of the debug output
• Allow to give the bitcoin program/data directory (special request)

(Edited to add more features.)

Check it out at bitbucket.org/jneb/bitcoin (click the "get source")
Prerequistes: Python 2.7, PyCrypto, colorama (optional, for color output).
Tested on Windows, should work on Mac/Linux.

Hope you like it.

That would be quite easy. I put it on my todo list.

Thanks for the hint, BitLotto.

Check out version 3.7 of the program: listing transactions per address have an instant start now, once the index is made. (Edited: I realised it is not easy to find the first transaction for an address if all you have is the public key position in the file: a bit of redesign is needed, but there is a kludge for now: it is still fast and works in most cases.)

The command "update" will make an index for you: future versions will even make use of a partial index.

I am also working on a "random address function": please allow a few days for delivery.

Reminder: the program is at bitbucket.org/jneb/bitcoin, prerequistes: Python 2.7, PyCrypto and optionally colorama.

(I could use some help making it an executable, BTW.)

Yes, there is a difference between Crypto.hash and the full PyCrypto.
Glad you have it working, and thanks for the Bitcoins!
BTW there is a new version (again), with two new commands:
listen: print a summary of the debug file produced by the BitCoin program
script: give the input/output script of a transaction

Hope you like it.

The tool is a "watch only" tool, although it allows you to talk to your local bitcoin server and tell it to do stuff.
And yet, you can list you own transactions, and follow the money back to the coin creation or in the other direction to an unspent account.
I didn't put in a way to locate the blockchain and wallet. Good idea; I put it in version 3.5. (Edited: Version 3.5 is out now).
- jneb

I you run Windows, the simplest way to get PyCrypto is voidspace: http://www.voidspace.org.uk/python/modules.shtml#pycrypto
I put that in the error message now.
- jneb

Thanks for the reply and the ideas!

Be sure to get the new version: I had a memory leak (!! my first one in Python) which is fixed now.
Now for the questions:
Getting a tx for an address is pretty slow, since BitCoin doesn't keep a database of that. The program searches through the entire block file using mmap.find, and to speed it up, it first figures out the public key.
Searching from a given block number is a good idea: will come up in a future version for sure.

Filters are an interesting idea. There is already a bit of that in the new "categorise addresses" command. It would be very slow, though.

- jneb

Hi,
My program keeps progressing. To whet your appetite, here some interesting statistics:
Highest transaction ever: 432109.87654321 BTC (block 130281)
Smallest: .00000001 (25888 times)

There are 1532089 transactions and 1228772 accounts.
524680 amounts are unspent.
Accounts used only once for storing an amount of money: 217423
Highest number of transactions to one account: 8076 (159FTr7Gjs2Qbj4Q5q29cvmchhqymQA7of)
Second highest: 7843 (the culprit is 1E29AKE7Lh1xW4ujHotoT4JVDaDdRPJnWu)
Highest number of inputs to a transaction: 965 (block 55862)
Highest number of outputs: 2002 (block 134334)
Transactions of BTC .01: 180593 (very popular amount; first block 2812)
There are 275974 transactions with one input and one output.
Accounts that have money stored to then once, and never retrieved:
The block hash values are nicely distributed in the range 0..limit, which means that nobody is fiddling with the block hashes. As an exception, block 0 has a low hash value, but that is explainable.
There is one signature that is incorrectly coded (used non-significant zeroes in the DER encoding).
Most signatures (with 64 bytes data) take 71 bytes, but there are 15 signatures of 69 bytes (because non-significant zeroes are suppressed).
Lowest "seriously looking" account value: 1TDpWBBvGdL8MggaRq1AJ7U36RWsuL, but no money has been withdrawn from it yet. This is one output of a 1999 output transaction in block 134334.
And so on...

Newest feature of the program: a local public key store, so searching for transactions is faster.

See bitbucket.org/jneb/bitcoin: it is a single Python 2.7 file. Installing colorama is recommended.

Hope you like it.
jneb

I am not sure I understand what you mean.
The total fees per block are shown if you enter a block, and type more (or just <CR>) already.
- jneb

That is what happens if you publish something for the first time.
There was a big bug in my bitcoin program, so that the "more" function didn't work, resulting in a, er, suboptimal user experience.
The program now gives much better help messages, an it still has all these functions.
You get it from bitbucket.org/jneb/bitcoin, click the "get source" button. It is only one file.
A short demo:

prompt>python jbitcoin.py
Welcome to the interactive environment. Type q to exit; ? for help.
|> last
Block 135113, 07-07-11 @ 06:06:56
173 transactions.
Hash:   0000000000000616989acdd24c859c14b046543d437b70ca050f5d9af76729fc
Nonce: 418719447, Bits: 1a0abbcf, giving difficulty 1563028.00
Next hash: ..0000000000    Previous hash: ..e14e960faa
|> more
Target: 0000000000000abbcf0000000000000000000000000000000000000000000000
 0:  1 in,  1 out, hash=..f55686091b, amount=  50.09 fee=-0.09 (135113)
 1:  1 in,  1 out, hash=..05368e940d, amount=   1.23 fee=0.00 (135113)
 2:  3 in,  2 out, hash=..6bf1a4c2ac, amount=  10.20 fee=0.00 (135113)
 3:  5 in,  1 out, hash=..c8bd3ccbdc, amount=  18.55 fee=0.00 (135113)
 4:  1 in,  2 out, hash=..ea0f4c2e98, amount=   1.02 fee=0.00 (135113)
 5:  3 in,  2 out, hash=..e87643305c, amount= 149.18 fee=0.00 (135113)
 6:  2 in,  2 out, hash=..4c7ee141d5, amount=  17.01 fee=0.00 (135113)
 7:  3 in,  2 out, hash=..2b1d4dfa2b, amount=   5.26 fee=0.00 (135113)
 8:  1 in,  2 out, hash=..14dc3c3169, amount=   0.25 fee=0.00 (135113)
 9:  2 in,  1 out, hash=..69893c0f57, amount=   1.11 fee=0.00 (135113)
...
163:  1 in,  2 out, hash=..029d68e619, amount=   2.44 fee=0.00 (135113)
164:  1 in,  2 out, hash=..0f68ff7f6a, amount=   2.17 fee=0.00 (135113)
165:  1 in,  2 out, hash=..d9517a4d63, amount=   1.10 fee=0.00 (135113)
166:  1 in,  2 out, hash=..421387ba95, amount=   0.96 fee=0.00 (135113)
167:  1 in,  2 out, hash=..5f088c70e4, amount=   0.93 fee=0.00 (135113)
168:  1 in,  2 out, hash=..c30227fd64, amount=   0.59 fee=0.00 (135113)
169:  1 in,  2 out, hash=..ae9f0248f4, amount=   0.09 fee=0.00 (135113)
170:  1 in,  2 out, hash=..1da17dd04c, amount=   0.08 fee=0.00 (135113)
171:  1 in,  2 out, hash=..7cb26c6be8, amount=   0.03 fee=0.00 (135113)
172:  2 in,  2 out, hash=..0976a71f0b, amount=   0.03 fee=0.00 (135113)
|>
No more details.
|> 168
Transaction ..c30227fd64 from block 135113: 07-07-11 @ 06:06:56
Inputs: 1, outputs: 2, amount: 0.59, fee: 0.00
(1 unspent)
|> more
Hash: 346930aabab5680d3e75e7b29df397a70eb6537ae30044534937efc30227fd64
 0: In     0.59: from 1L8zFHdgLD6neXEwkQjPtxjEyCezmJaqoM, trx ..5f088c70e4[0]=
 1: Out    0.09: to   1HoSZisiokmGUhaJzCfXnU5UaCYSfUveJv, trx ..ae9f0248f4[0]=
 2: Out    0.50: to   15CKrgamF2CsuVuY7NbUrYhEyaG8kPZPSv (not spent)=
|> 0
Transaction ..5f088c70e4 from block 135113: 07-07-11 @ 06:06:56
Inputs: 1, outputs: 2, amount: 0.93, fee: 0.00
(1 unspent)
|> more
Hash: a351b331c0202470241e6bafc5228c560648ffd56aeb8e7387c7385f088c70e4
 0: In     0.93: from 12Ck3vuPZQLx9QHHySVyAi2ci19WVSWCQX, trx ..421387ba95[0]=
 1: Out    0.59: to   1L8zFHdgLD6neXEwkQjPtxjEyCezmJaqoM, trx ..c30227fd64[0]=
 2: Out    0.34: to   19PsjrzHTgHCCUGci1hdMwfYPHbfdT3GaF (not spent)=
|> 0
Transaction ..421387ba95 from block 135113: 07-07-11 @ 06:06:56
Inputs: 1, outputs: 2, amount: 0.96, fee: -0.00
(1 unspent)
|>
Hash: ddd9bea081c8ef709699ff309402aca625b44084c13deeb581ea7d421387ba95
 0: In     0.96: from 1NUixFvMttKWpCsM1Jh7dxXsBYtJkcTk7r, trx ..d9517a4d63[0]=
 1: Out    0.93: to   12Ck3vuPZQLx9QHHySVyAi2ci19WVSWCQX, trx ..5f088c70e4[0]=
 2: Out    0.03: to   1B3e87Mq114UoYnWUtxRe4ua5oARYNSi4C (not spent)=
|> converge 0
Followed a chain of length 68
Found 66 extra outputs with 66 addresses
|>
Extra outputs that obtained money
  # freq address
  0:  1* 12W8h3KH1Gq925xuJFAHrsc3o4vhiURwBi
  1:  1* 1Cm95xXpiaMpW7iqKUhKcGe6x32gcxviJX
  2:  1* 1FfJ7MUtaBzoSmUQSt4SP1QWwVYVMr5dAh
  3:  1* 1WxNtJXBnFzHo6Kutc3gyZA5qMaGH8SrL
  4:  1* 1CMPmoY5sQMy4eCiFu5BgMnPNSkMAC6Eqa
  5:  1* 17WLcpiQzApEcrZQ81rPaizFHum47Cr4Hr
  6:  1* 1KAKbv5EPvebcbKerCecGTbG2sU65UsX4P
  7:  1* 1FDDLBSKjg9exoEohjKznK6AX1hRMNEG94
  8:  1* 1P8fTpj6YhhGFRPPs7Cqm1Nkri4zm8RVYH
  9:  1* 192tzZib9NCMMqdxivvEysDQdGdrgjqPG9
...
 56:  1* 1FCH1mRzjzYb3KgWkmX3qmdpQRnqqKmJWP
 57:  1* 1PmdQyKsCKJqkjCZKP9QEQnzBLcPga1g1A
 58:  1* 1KRkJ6qwoq4BbyBha45AkGfeugg3P33VF5
 59:  1* 1Nkj5stjKAaZeiCaLojk6GxeJPxpbVpd99
 60:  1* 163CPiZWEgn8vtCagaxsnyW1erHHWqEkf5
 61:  1* 1Kd7YtchtdyWPe6z9qmEibUPBZhsDzij6j
 62:  1* 17xAoZ51LNE8VvL1BNnidrfnfJBAtZjyRS
 63:  1* 1Nog7UK1A3C6UgpimHDZmR2ghrh6oenbQy
 64:  1* 1CSPcRMLmCsj5oagLv6sSbJyhoJmevfZQs
 65:  1* 17CLwhc48apCHh73Na1bWGDB3q5e5Gba8r
|>
Chain:
66: Transaction(1 in, 2 out, hash=..d9517a4d63) from block 135113
67: Transaction(1 in, 2 out, hash=..0f68ff7f6a) from block 135113
68: Transaction(1 in, 2 out, hash=..029d68e619) from block 135113
69: Transaction(1 in, 2 out, hash=..0035d1987a) from block 135113
70: Transaction(1 in, 2 out, hash=..bc24e69a28) from block 135113
71: Transaction(1 in, 2 out, hash=..7f10f8f98e) from block 135113
72: Transaction(1 in, 2 out, hash=..d8f5e5e391) from block 135113
73: Transaction(1 in, 2 out, hash=..45e5a030c1) from block 135113
74: Transaction(1 in, 2 out, hash=..cf0796496b) from block 135113
75: Transaction(1 in, 2 out, hash=..a44a2188e9) from block 135113
...
124: Transaction(1 in, 2 out, hash=..81a97eaff6) from block 135113
125: Transaction(1 in, 2 out, hash=..6af1eaf662) from block 135113
126: Transaction(1 in, 2 out, hash=..c7994ec60d) from block 135113
127: Transaction(1 in, 2 out, hash=..d0c114e3c1) from block 135113
128: Transaction(1 in, 2 out, hash=..994f886b26) from block 135113
129: Transaction(1 in, 2 out, hash=..a059722a82) from block 135113
130: Transaction(1 in, 2 out, hash=..d55e68cf82) from block 135108
131: Transaction(1 in, 2 out, hash=..31aa415886) from block 135107
132: Transaction(1 in, 1 out, hash=..2c316a9e93) from block 135106
133: Transaction(1 in, 1 out, hash=..a1eb554e32) from block 135004
|> 6
Bitcoin address: 1KAKbv5EPvebcbKerCecGTbG2sU65UsX4P
|>
Hash: c7358931ecd341acc86317e950214520a751e74b
public key not known (yet)
|>
All transactions of 1KAKbv5EPvebcbKerCecGTbG2sU65UsX4P by date:
Pubkey search: blockexplorer : address not seen.
<Takes long reading block file from disk: User pressed Ctrl-C>
*** Printing interrupted.
|> quit

I hope you get the idea.
- jneb

Hi folks,
I wrote (yet another?) bitcoin program in Python, allowing to explore the local block chain.
See bitbucket.org/jneb/bitcoin.
I hope you like it.