Xenland (OP)
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April 22, 2012, 06:54:57 AM |
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How do I read the Bitcoin blockchain with an api or library with a programming language like php, python or java?
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ThomasV
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April 22, 2012, 06:58:17 AM |
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How do I read the Bitcoin blockchain with an api or library with a programming language like php, python or java?
use libbitcoin
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Electrum: the convenience of a web wallet, without the risks
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kokjo
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April 22, 2012, 06:58:30 AM |
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"The whole problem with the world is that fools and fanatics are always so certain of themselves and wiser people so full of doubts." -Bertrand Russell
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arby
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keybase.io/arblarg
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April 22, 2012, 07:07:40 AM |
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libbitoin as i see is in cpp, not php or java, python as the OP mentioned. I think he is interested in using this on linux, and not using any executables. I am searching for this also, but have not found anything yet. What I found that you can reliably use with PHP is: https://blockchain.info/apihttps://blockchain.info/qTo explore the blockchain.
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kokjo
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April 22, 2012, 07:09:42 AM |
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libbitoin as i see is in cpp, not php or java, python as the OP mentioned.
I thin he is interested in using this on linux, and not using any executables.
swig!
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"The whole problem with the world is that fools and fanatics are always so certain of themselves and wiser people so full of doubts." -Bertrand Russell
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arby
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keybase.io/arblarg
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April 22, 2012, 07:14:45 AM |
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libbitoin as i see is in cpp, not php or java, python as the OP mentioned.
I thin he is interested in using this on linux, and not using any executables.
swig! Ok I will give that a try also, thanks for the info
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ThomasV
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April 22, 2012, 07:54:46 AM |
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libbitoin as i see is in cpp, not php or java, python as the OP mentioned.
yes, it has a python frontend
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Electrum: the convenience of a web wallet, without the risks
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Xenland (OP)
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April 22, 2012, 08:35:55 PM |
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Nice responses mates, libbitcoin should work fine for what i need
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Xenland (OP)
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April 23, 2012, 05:54:10 AM |
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So how do I use this libbitcoin thing, for example something simple like a balance of a particular address, or a list of details of a particular address? (with python)
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kokjo
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April 23, 2012, 07:31:27 AM |
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So how do I use this libbitcoin thing, for example something simple like a balance of a particular address, or a list of details of a particular address? (with python)
don't know, try read the api... im not a libbitcoin guru.
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"The whole problem with the world is that fools and fanatics are always so certain of themselves and wiser people so full of doubts." -Bertrand Russell
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Xenland (OP)
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April 23, 2012, 08:49:31 AM |
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Libbitcoin is quite confusing even looking through the source code, are there any alternatives to libbitcoin that could help me query the blockchain?
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etotheipi
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April 23, 2012, 02:30:11 PM |
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Armory is perfect this. It is C++ accessed in Python (via SWIG). You only ever touch python. I'm not at my development computer now but there is example code on my github page (though many of the examples were created before RAM reduction, they will mostly still work) from armoryengine import *
print '\n\nLoading Blockchain from:', BLK0001_PATH BDM_LoadBlockchainFile() # optional argument to specify blk0001.dat location print 'Done!'
print '\n\nCurrent Top Block is:', TheBDM.getTopBlockHeader().getBlockHeight() TheBDM.getTopBlockHeader().pprint()
tx = TheBDM.getTxByHash( hex_to_binary('9c633b5689e462ddf3d52a6edc64226cedd1e1749d0b8e2f70cd9550bfa74c72') ) tx.pprint()
# Create and register the wallet before the LoadBlockchainFile call, to merge the scans # For now, this will rescan the blockchain cppWallet = Cpp.BtcWallet() cppWallet.addAddress_1_( hex_to_binary('9c633b56899c633b56899c633b56899c633b5689') ) # hash160 TheBDM.registerWallet(cppWallet) TheBDM.scanBlockchainForTx(cppWallet) print cppWallet.getSpendableBalance()
unspentTxOuts = cppWallet.getSpendableTxOutList() for utxo in unspentTxOuts: utxo.pprintOneLine()
(note, this code is notional since I can't test it where I am, but the syntax is nearly correct) When I get home later, I can post more example code for how to access what you want. If you tell me what you're trying to do with it, I can write more directed code samples for you.
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Xenland (OP)
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April 23, 2012, 08:31:30 PM |
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Armory is perfect this. It is C++ accessed in Python (via SWIG). You only ever touch python. I'm not at my development computer now but there is example code on my github page (though many of the examples were created before RAM reduction, they will mostly still work) from armoryengine import *
print '\n\nLoading Blockchain from:', BLK0001_PATH BDM_LoadBlockchainFile() # optional argument to specify blk0001.dat location print 'Done!'
print '\n\nCurrent Top Block is:', TheBDM.getTopBlockHeader().getBlockHeight() TheBDM.getTopBlockHeader().pprint()
tx = TheBDM.getTxByHash( hex_to_binary('9c633b5689e462ddf3d52a6edc64226cedd1e1749d0b8e2f70cd9550bfa74c72') ) tx.pprint()
# Create and register the wallet before the LoadBlockchainFile call, to merge the scans # For now, this will rescan the blockchain cppWallet = Cpp.BtcWallet() cppWallet.addAddress_1_( hex_to_binary('9c633b56899c633b56899c633b56899c633b5689') ) # hash160 TheBDM.registerWallet(cppWallet) TheBDM.scanBlockchainForTx(cppWallet) print cppWallet.getSpendableBalance()
unspentTxOuts = cppWallet.getSpendableTxOutList() for utxo in unspentTxOuts: utxo.pprintOneLine()
(note, this code is notional since I can't test it where I am, but the syntax is nearly correct) When I get home later, I can post more example code for how to access what you want. If you tell me what you're trying to do with it, I can write more directed code samples for you. Nice I heard about armory but I thought it was just a GUI client with advanced features. I'll try it out with python see how it is.
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etotheipi
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April 24, 2012, 01:05:10 AM |
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Here you go! I just put together a script that not only scans the blockchain, it does something useful! (it's at the bottom of the post) - It took 18 seconds for me to scan the whole blockchain from a cold start
- It took 0.2 seconds to collect a list of every difficulty change since the genesis block.
- It took 24 seconds on my system to count 3,532,497 unique addresses in the blockchain! (as of block 176953)
Timings will vary depending on RAM. If you have a lot of RAM, just about the whole blockchain will be cached from the first scan, and rescans will be nearly instantaneous. If you want to avoid rescans, make sure everything is added to your wallet and registered with TheBDM.registerWallet before BDM_LoadBlockChain(). The sample python script at the bottom of this post produced the following output (the difficulty changes): Collect all difficulty changes... Block Diff Date 0 1.0 2009-Jan-03 01:15pm 32256 1.2 2009-Dec-30 01:11am 34272 1.3 2010-Jan-11 05:48pm 36288 1.3 2010-Jan-25 08:07am 38304 1.8 2010-Feb-04 04:43pm 40320 2.5 2010-Feb-14 06:52pm 42336 3.8 2010-Feb-24 03:41am 44352 4.5 2010-Mar-07 08:14pm 46368 4.6 2010-Mar-21 06:54pm 48384 6.1 2010-Apr-01 07:07am 50400 7.8 2010-Apr-12 04:39am 52416 11.5 2010-Apr-21 05:52pm 54432 12.8 2010-May-04 05:46am 56448 11.8 2010-May-19 10:13am 58464 16.6 2010-May-29 09:57am 60480 17.4 2010-Jun-11 07:26pm 62496 19.4 2010-Jun-24 08:27am 64512 23.5 2010-Jul-05 09:57pm 66528 45.4 2010-Jul-13 04:03am 68544 181.5 2010-Jul-16 12:29pm 70560 244.2 2010-Jul-26 10:42pm 72576 352.2 2010-Aug-05 03:46pm 74592 511.8 2010-Aug-15 07:11am 76608 623.4 2010-Aug-26 07:13pm 78624 712.9 2010-Sep-08 01:04am 80640 917.8 2010-Sep-18 10:04pm 82656 1318.7 2010-Sep-28 03:58pm 84672 1378.0 2010-Oct-12 01:35am 86688 2149.0 2010-Oct-21 01:13am 88704 3091.7 2010-Oct-30 06:58pm 90720 4536.4 2010-Nov-09 07:29am 92736 6866.9 2010-Nov-18 01:44pm 94752 8078.2 2010-Nov-30 11:37am 96768 12252.0 2010-Dec-09 05:20pm 98784 14484.2 2010-Dec-21 01:34pm 100800 16307.4 2011-Jan-03 12:10am 102816 18437.6 2011-Jan-15 09:26am 104832 22012.4 2011-Jan-27 03:16am 106848 25997.9 2011-Feb-07 11:53pm 108864 36459.9 2011-Feb-18 12:15am 110880 55589.5 2011-Feb-27 04:59am 112896 76192.6 2011-Mar-09 10:25am 114912 68977.8 2011-Mar-24 10:39pm 116928 82345.6 2011-Apr-05 04:09pm 118944 92347.6 2011-Apr-18 03:49am 120960 109670.1 2011-Apr-29 10:53pm 122976 157416.4 2011-May-09 05:17pm 124992 244112.5 2011-May-18 06:04pm 127008 434877.0 2011-May-26 02:41pm 129024 567269.5 2011-Jun-06 08:25am 131040 876954.5 2011-Jun-15 09:49am 133056 1379192.3 2011-Jun-24 07:45am 135072 1563028.0 2011-Jul-06 04:35pm 137088 1690895.8 2011-Jul-19 03:23pm 139104 1888786.7 2011-Aug-01 04:11am 141120 1805700.8 2011-Aug-15 07:44pm 143136 1777774.5 2011-Aug-30 01:15am 145152 1755425.3 2011-Sep-13 05:31am 147168 1689334.4 2011-Sep-27 06:47pm 149184 1468195.4 2011-Oct-13 09:44pm 151200 1203461.9 2011-Oct-30 11:42pm 153216 1192497.8 2011-Nov-14 01:56am 155232 1090715.7 2011-Nov-29 09:20am 157248 1155038.3 2011-Dec-12 02:42pm 159264 1159929.5 2011-Dec-26 01:43pm 161280 1250757.7 2012-Jan-08 01:26pm 163296 1307728.4 2012-Jan-21 10:55pm 165312 1379647.4 2012-Feb-04 05:32am 167328 1376302.3 2012-Feb-18 06:24am 169344 1496978.6 2012-Mar-02 03:25am 171360 1498294.4 2012-Mar-16 04:09am 173376 1626553.5 2012-Mar-29 01:41am 175392 1577913.5 2012-Apr-12 12:04pm Took 0.2 seconds to collect difficulty list
And here is the script itself. It illustrates a variety of ways you can access block data. Mainly, scanning for addresses in the blockchain with balances and unspent outputs, and walking through every TxOut of every Tx of every Block -- we grab the address from ever standard TxOut and add it to a set() object which only allows unique addresses. from armoryengine import *
# NOTE: # ALL ADDRESSES THROUGHOUT EVERYTHING ARE IN 20-BYTE BINARY FORM (hash160/addr20) # Use hash160_to_addrStr() and addrStr_to_hash160() to convert...
print '\n\nCreating a new C++ wallet, add a few addresses...' cppWallet = Cpp.BtcWallet() cppWallet.addAddress_1_( hex_to_binary('11b366edfc0a8b66feebae5c2e25a7b6a5d1cf31') ) # hash160 cppWallet.addAddress_1_( addrStr_to_hash160('1EbAUHsitefy3rSECh8eK2fdAWTUbpVUDN') ) # addrStr cppWallet.addAddress_1_('\x1b~\xa7*\x85\t\x12\xb7=\xd4G\xf3\xbd\xc1\x00\xf1\x00\x8b\xde\xb0') # binary
print 'Addresses in this wallet:' for i in range(cppWallet.getNumAddr()): print '\t', hash160_to_addrStr(cppWallet.getAddrByIndex(i).getAddrStr20())
print '\n\nRegistering the wallet with the BlockDataManager & loading...' start = RightNow() TheBDM.registerWallet(cppWallet) BDM_LoadBlockchainFile() # optional argument to specify blk0001.dat location print 'Loading blockchain took %0.1f sec' % (RightNow() - start)
topBlock = TheBDM.getTopBlockHeight() print '\n\nCurrent Top Block is:', topBlock TheBDM.getTopBlockHeader().pprint()
# Add new addresses -- will rescan (which will be super fast if you ahve a lot of RAM) cppWallet.addAddress_1_( hex_to_binary('0cdcd0f388a31b11ff11b1d8d7a9f978b37bc7af') ) TheBDM.scanBlockchainForTx(cppWallet)
print '\n\nBalance of this wallet:', coin2str(cppWallet.getSpendableBalance()) print 'Unspent outputs:' unspentTxOuts = cppWallet.getSpendableTxOutList(topBlock) for utxo in unspentTxOuts: utxo.pprintOneLine()
print '\n\nTransaction history of this wallet:' ledger = cppWallet.getTxLedger() for le in ledger: le.pprintOneLine()
print '\n\n' print '-'*80 print 'Now for something completely different...' start = RightNow() print '\n\nCollect all difficulty changes...' prevDiff = 0 for h in xrange(0,topBlock+1): header = TheBDM.getHeaderByHeight(h) currDiff = header.getDifficulty() if not prevDiff==currDiff: print str(h).rjust(10), print ('%0.1f'%currDiff).rjust(10), print '\t',unixTimeToFormatStr(header.getTimestamp()) prevDiff = currDiff
print 'Took %0.1f seconds to collect difficulty list' % (RightNow()-start) print '\n\nCount the number of unique addresses in the blockchain' start = RightNow() allAddr = set() for h in xrange(0,topBlock+1): if h%10000 == 0: print '\tScanned %d blocks' % h header = TheBDM.getHeaderByHeight(h) txList = header.getTxRefPtrList() for tx in txList: for nout in range(tx.getNumTxOut()): txout = tx.getTxOutRef(nout) if txout.isStandard(): allAddr.add(txout.getRecipientAddr())
print 'Took %0.1f seconds to count all addresses' % (RightNow()-start) print 'There are %d unique addresses in the blockchain!' % len(allAddr)
This scanning is lower-level than what happens in Armory, so you are mainly using C++ objects. You can find a full list of all the methods in BlockObjRef.h and BlockUtils.h. Please ask questions if something isn't clear, or if you want to use some functionality not exemplified here.
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Sukrim
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April 24, 2012, 01:11:23 AM |
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If you tell me what you're trying to do with it, I can write more directed code samples for you.
I personally want to get the timestamp of blocks with a certain block height once per day, but didn't get around to looking at either libbitcoin or Armory. Ideally it would be something like "TheBDM.getHeaderByHeight(12345).getTimestamp()"... Also for armory I still have to run bitcoind to get the blockchain updated, right? Edit: Wow - this is awesome, you manage to answer my posts before I even post them! ![Shocked](https://bitcointalk.org/Smileys/default/shocked.gif) Edit2: And I even guessed both function names correctly to the letter! This is getting creepy...
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etotheipi
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April 24, 2012, 01:13:40 AM |
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If you tell me what you're trying to do with it, I can write more directed code samples for you.
I personally want to get the timestamp of blocks with a certain block height once per day, but didn't get around to looking at either libbitcoin or Armory. Ideally it would be something like "TheBDM.getHeaderByHeight(12345).getTimestamp()"... Also for armory I still have to run bitcoind to get the blockchain updated, right? To use Armory, you need bitcoind running to receive blockchain updates and send&receive transactions. For the example code above, you only need to have the blk0001.dat file produced by the bitcoind, but it doesn't need to be running when you run the script. Edit: Wow, I must have telepathy. Glad I could answer your question... before you asked it!
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Xenland (OP)
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April 24, 2012, 05:55:41 AM |
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How does one just query the balance of a Bitcoin address with armory? is there any calculations involved(like looping over tx history and sum up a balance) or can I just call it and print out a simple balance?
Im' sure a lot of programmers could benefit the solution to this question to write their own software to use armory for like making their own Blockchain.info website or w/e.
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etotheipi
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April 24, 2012, 03:53:52 PM |
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How does one just query the balance of a Bitcoin address with armory? is there any calculations involved(like looping over tx history and sum up a balance) or can I just call it and print out a simple balance?
Im' sure a lot of programmers could benefit the solution to this question to write their own software to use armory for like making their own Blockchain.info website or w/e.
The code was in my example, but I guess my example was too long. So here's an extraction of it. from armoryengine import *
cppWallet = Cpp.BtcWallet() cppWallet.addAddress_1_( addrStr_to_hash160('1EbAUHsitefy3rSECh8eK2fdAWTUbpVUDN') ) # addrStr TheBDM.registerWallet(cppWallet) BDM_LoadBlockchainFile() TheBDM.scanBlockchainForTx(cppWallet)
fullBalance = cppWallet.getFullBalance()
print '\n\nBalance of this wallet:', coin2str(fullBalance)
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Xenland (OP)
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April 25, 2012, 12:02:20 AM |
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How does one just query the balance of a Bitcoin address with armory? is there any calculations involved(like looping over tx history and sum up a balance) or can I just call it and print out a simple balance?
Im' sure a lot of programmers could benefit the solution to this question to write their own software to use armory for like making their own Blockchain.info website or w/e.
The code was in my example, but I guess my example was too long. So here's an extraction of it. from armoryengine import *
cppWallet = Cpp.BtcWallet() cppWallet.addAddress_1_( addrStr_to_hash160('1EbAUHsitefy3rSECh8eK2fdAWTUbpVUDN') ) # addrStr TheBDM.registerWallet(cppWallet) BDM_LoadBlockchainFile() TheBDM.scanBlockchainForTx(cppWallet)
fullBalance = cppWallet.getFullBalance()
print '\n\nBalance of this wallet:', coin2str(fullBalance)
Oh yeah I noticed that part of your code, I just assumed that there was a quick way of going about this since it takes a few seconds to scan the block chain for one address and I'm looking for a way to scan and update the database for multiple addresses. Does that sound possible or am I stuck with this route you presented me? Thanks for your help btw I appreciate it.
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etotheipi
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April 25, 2012, 01:20:07 AM |
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Oh yeah I noticed that part of your code, I just assumed that there was a quick way of going about this since it takes a few seconds to scan the block chain for one address and I'm looking for a way to scan and update the database for multiple addresses. Does that sound possible or am I stuck with this route you presented me? Thanks for your help btw I appreciate it.
You can use as many addAddress_1_() calls as you want before a rescan, and the rescan will still take the same amount of time. Load 20 addresses into your wallet before loading the blockchain, and it will take the same time as if you loaded in 10,000. After the blockchain is loaded, if you add any new addresses to the wallet, the chain will be re-scanned on the "scanBlockchainForTx()" call, and again, it won't matter how many addresses that is, it'll take the same amount of time.
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