Pybitcointools, Python library for Bitcoin signatures and transactions

Advantages:

Functions have a simple interface, inputting and outputting in standard formats
No classes
Many functions can be taken out and used individually
Supports binary, hex and base58
Transaction deserialization format almost compatible with BitcoinJS
Electrum and BIP0032 support
Make and publish a transaction all in a single command line instruction
Includes non-bitcoin-specific conversion and JSON utilities

Disadvantages:

Not a full node, has no idea what blocks are
Relies on centralized service (blockchain.info) for blockchain operations, although operations do have backups (eligius, blockr.io)

Example usage (best way to learn :) ):

> from bitcoin import *
> priv = sha256('some big long brainwallet password')
> priv
'57c617d9b4e1f7af6ec97ca2ff57e94a28279a7eedd4d12a99fa11170e94f5a4'
> pub = privtopub(priv)
> pub
'0420f34c2786b4bae593e22596631b025f3ff46e200fc1d4b52ef49bbdc2ed00b26c584b7e32523fb01be2294a1f8a5eb0cf71a203cc034ced46ea92a8df16c6e9'
> addr = pubtoaddr(pub)
> addr
'1CQLd3bhw4EzaURHbKCwM5YZbUQfA4ReY6'
> h = history(addr)
> h
[{'output': u'97f7c7d8ac85e40c255f8a763b6cd9a68f3a94d2e93e8bfa08f977b92e55465e:0', 'value': 50000, 'address': u'1CQLd3bhw4EzaURHbKCwM5YZbUQfA4ReY6'}, {'output': u'4cc806bb04f730c445c60b3e0f4f44b54769a1c196ca37d8d4002135e4abd171:1', 'value': 50000, 'address': u'1CQLd3bhw4EzaURHbKCwM5YZbUQfA4ReY6'}]
> outs = [{'value': 90000, 'address': '16iw1MQ1sy1DtRPYw3ao1bCamoyBJtRB4t'}]
> tx = mktx(h,outs)
> tx
'01000000025e46552eb977f908fa8b3ee9d2943a8fa6d96c3b768a5f250ce485acd8c7f7970000000000ffffffff71d1abe4352100d4d837ca96c1a16947b5444f0f3e0bc645c430f704bb06c84c0100000000ffffffff01905f0100000000001976a9143ec6c3ed8dfc3ceabcc1cbdb0c5aef4e2d02873c88ac00000000'
> tx2 = sign(tx,0,priv)
> tx2
'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'
> tx3 = sign(tx2,1,priv)
> tx3
'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'
> pushtx(tx3)
'Transaction Submitted'

Or using the pybtctool command line interface:

@vub: pybtctool random_electrum_seed
484ccb566edb66c65dd0fd2e4d90ef65

@vub: pybtctool electrum_privkey 484ccb566edb66c65dd0fd2e4d90ef65 0 0
593240c2205e7b7b5d7c13393b7c9553497854b75c7470b76aeca50cd4a894d7

@vub: pybtctool electrum_mpk 484ccb566edb66c65dd0fd2e4d90ef65
484e42865b8e9a6ea8262fd1cde666b557393258ed598d842e563ad9e5e6c70a97e387eefdef123c1b8b4eb21fe210c6216ad7cc1e4186fbbba70f0e2c062c25

@vub: pybtctool bip32_master_key 21456t243rhgtucyadh3wgyrcubw3grydfbng
xprv9s21ZrQH143K2napkeoHT48gWmoJa89KCQj4nqLfdGybyWHP9Z8jvCGzuEDv4ihCyoed7RFPNbc9NxoSF7cAvH9AaNSvepUaeqbSpJZ4rbT

@vub: pybtctool bip32_ckd xprv9s21ZrQH143K2napkeoHT48gWmoJa89KCQj4nqLfdGybyWHP9Z8jvCGzuEDv4ihCyoed7RFPNbc9NxoSF7cAvH9AaNSvepUaeqbSpJZ4rbT 0
xprv9vfzYrpwo7QHFdtrcvsSCTrBESFPUf1g7NRvayy1QkEfUekpDKLfqvHjgypF5w3nAvnwPjtQUNkyywWNkLbiUS95khfHCzJXFkLEdwRepbw 

@vub: pybtctool bip32_privtopub xprv9s21ZrQH143K2napkeoHT48gWmoJa89KCQj4nqLfdGybyWHP9Z8jvCGzuEDv4ihCyoed7RFPNbc9NxoSF7cAvH9AaNSvepUaeqbSpJZ4rbT
xpub661MyMwAqRbcFGfHrgLHpC5R4odnyasAZdefbDkHBcWarJcXh6SzTzbUkWuhnP142ZFdKdAJSuTSaiGDYjvm7bCLmA8DZqksYjJbYmcgrYF

The -s option lets you read arguments from the command line

@vub: pybtctool sha256 'some big long brainwallet password' | pybtctool -s privtoaddr | pybtctool -s history
[{'output': u'97f7c7d8ac85e40c255f8a763b6cd9a68f3a94d2e93e8bfa08f977b92e55465e:0', 'value': 50000, 'address': u'1CQLd3bhw4EzaURHbKCwM5YZbUQfA4ReY6'}, {'output': u'4cc806bb04f730c445c60b3e0f4f44b54769a1c196ca37d8d4002135e4abd171:1', 'value': 50000, 'address': u'1CQLd3bhw4EzaURHbKCwM5YZbUQfA4ReY6'}]
@vub: pybtctool random_electrum_seed | pybtctool -s electrum_privkey 0 0
593240c2205e7b7b5d7c13393b7c9553497854b75c7470b76aeca50cd4a894d7

The -b option lets you read binary data as an argument

@vub: pybtctool sha256 123 | pybtctool -s changebase 16 256 | pybtctool -b changebase 256 16
a665a45920422f9d417e4867efdc4fb8a04a1f3fff1fa07e998e86f7f7a27ae30a

The -j option lets you read json from the command line (-J to split a json list into multiple arguments)

@vub: pybtctool unspent 1FxkfJQLJTXpW6QmxGT6oF43ZH959ns8Cq | pybtctool -j select 200000001 | pybtctool -j mksend 1EXoDusjGwvnjZUyKkxZ4UHEf77z6A5S4P:20000 1FxkfJQLJTXpW6QmxGT6oF43ZH959ns8Cq 1000 | pybtctool -s signall 805cd74ca322633372b9bfb857f3be41db0b8de43a3c44353b238c0acff9d523
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

Fun stuff with json:

@vub: pybtctool history 1EXoDusjGwvnjZUyKkxZ4UHEf77z6A5S4P | pybtctool -j multiaccess value | pybtctool -j sum
625216206372

@vub: pybtctool history 1EXoDusjGwvnjZUyKkxZ4UHEf77z6A5S4P | pybtctool -j count
6198

Listing of main commands:

privkey_to_pubkey : (privkey) -> pubkey
privtopub : (privkey) -> pubkey
pubkey_to_address : (pubkey) -> address
pubtoaddr : (pubkey) -> address
privkey_to_address : (privkey) -> address
privtoaddr : (privkey) -> address
add : (key1, key2) -> key1 + key2 (works on privkeys or pubkeys)
multiply : (pubkey, privkey) -> returns pubkey * privkey
ecdsa_sign : (message, privkey) -> sig
ecdsa_verify : (message, sig, pubkey) -> True/False
ecdsa_recover : (message, sig) -> pubkey
random_key : () -> privkey
random_electrum_seed : () -> electrum seed
random_elec2_seed : () -> electrum seed
random_bip39_seed :
random_bip39_mn :
random_mini_key : () -> 30 character mini private key
electrum_stretch : (seed) -> secret exponent
electrum_privkey : (seed or secret exponent, i, type) -> privkey
electrum_mpk : (seed or secret exponent) -> master public key
electrum_pubkey : (seed or secexp or mpk) -> pubkey
elec1_mn_decode :
elec1_mn_encode :
elec2_mn_decode :
elec2_mn_encode :
random_elec2_seed :
bip32_master_key : (seed) -> bip32 master key
bip32_ckd : (private or public bip32 key, i) -> child key
bip32_privtopub : (private bip32 key) -> public bip32 key
bip32_extract_key : (private or public bip32_key) -> privkey or pubkey
bip32_path : (private or public bip32 key) -> child priv or pubkey at path "m/1H/2'/3.pub"
parse_bip32_path : bip32_path -> array of depths
bip39_to_mn : (entropy) -> bip39 mnemonic (lang = english, japanese, spanish, french, chinese_traditional, chinese_simplified)
bip39_to_seed : (bip39 mnemonic) -> hex seed (for bip32)
bip39_to_entropy : (bip39 mnemonic) -> input entropy
bip39_check : check mnemonic is bip39 compliant
bip39_detect_lang : detect language of bip39 mnemonic
random_bip39_mn : random mnemonic
deserialize : (hex or bin transaction) -> JSON tx
serialize : (JSON tx) -> hex or bin tx
mktx : (inputs, outputs) -> tx
mksend : (inputs, outputs, change_addr, fee) -> tx
sign : (tx, i, privkey) -> tx with index i signed with privkey
multisign : (tx, i, script, privkey) -> signature
apply_multisignatures: (tx, i, script, sigs) -> tx with index i signed with sigs
scriptaddr : (script) -> P2SH address
mk_multisig_script : (pubkeys, k, n) -> k-of-n multisig script from pubkeys
verify_tx_input : (tx, i, script, sig, pub) -> True/False
tx_hash : (hex or bin tx) -> hash
history : (address1, address2, etc) -> outputs to those addresses
unspent : (address1, address2, etc) -> unspent outputs to those addresses
fetchtx : (txash) -> tx if present
pushtx : (hex or bin tx) -> tries to push to blockchain.info/pushtx
access : (json list/object, prop) -> desired property of that json object
multiaccess : (json list, prop) -> like access, but mapped across each list element
slice : (json list, start, end) -> given slice of the list
count : (json list) -> number of elements
sum : (json list) -> sum of all values
get_block_coinbase : Return block's coinbase field (if any)
bip44_address :
mk_opreturn : (ascii message, hex Tx) -> adds msg as an OP_RETURN to hex Tx

BLOCKCHAIN DECODING/ENCODING:


signedtx = encode_file("filename_in_pybitcointools_rootdir.jpg", privkey_to_sign_with)
pushtx(signedtx, 'testnet', source='blockr')

with open('tunguska.png', 'wb') as fo:
    fo.write(decode_file("93532aa557c00bbe7abcade3423a59a2de971379365a3d5e8581fa6c8b8d7df4", network='testnet'))


TRANSACTION-RELATED:
~~~~~~~~~~~~~~~~~~~~~~~~

    > txh = '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'
    > txo = deserialize(txh)
    > txh_plus_opreturn = mk_opreturn("My ASCII message!", txh)
    > txh_plus_opreturn
    '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'

    > der_sigs = der_extract(txo)
    > der_sigs
     ['30450221009e03bb6122437767e2ca785535824f4ed13d2ebbb9fa4f9becc6d6f4e1e217dc022064577353c08d8d974250143d920d3b963b463e43bbb90f3371060645c49266b901', 3044022035dd67d18b575ebd339d05ca6ffa1d27d7549bd993aeaf430985795459fc139402201aaa162cc50181cee493870c9479b1148243a33923cb77be44a73ca554a4e5d601', 3045022014daa5c5bbe9b3e5f2539a5cd8e22ce55bc84788f946c5b3643ecac85b4591a9022100a4062074a1df3fa0aea5ef67368d0b1f0eaac520bee6e417c682d83cd043304501']

    > deserialize_der(der_sigs[0])
    (71472023862640473060809994352042629425574428600918189916883944970132289361884L,  133376868517818274990276330524947331990L,  0)

     > deserialize_der(der_sigs[0])
    (71472023862640473060809994352042629425574428600918189916883944970132289361884L,  133376868517818274990276330524947331990L,  0)

    > extract_tx_outpoints(txo)
    ['490a513c7e7bebaf3286c89c1ebc3dacc19d85f9b6c102cb98ae5883ae1a00d5:0',  '7d0884926e6697906b1be2fd22f64dcab32f3135e85e81c9f6a0f6df55d62915:1',  '805cd74ca322633372b9bfb857f3be41db0b8de43a3c44353b238c0acff9d523:1']


    > get_script(txh, 'ins')
    ['4830450221009e03bb6122437767e2ca785535824f4ed13d2ebbb9fa4f9becc6d6f4e1e217dc022064577353c08d8d974250143d920d3b963b463e43bbb90f3371060645c49266b90141048ef80f6bd6b073407a69299c2ba89de48adb59bb9689a5ab040befbbebcfbb15d01b006a6b825121a0d2c546c277acb60f0bd3203bd501b8d67c7dba91f27f47',  '473044022035dd67d18b575ebd339d05ca6ffa1d27d7549bd993aeaf430985795459fc139402201aaa162cc50181cee493870c9479b1148243a33923cb77be44a73ca554a4e5d60141048ef80f6bd6b073407a69299c2ba89de48adb59bb9689a5ab040befbbebcfbb15d01b006a6b825121a0d2c546c277acb60f0bd3203bd501b8d67c7dba91f27f47', '483045022014daa5c5bbe9b3e5f2539a5cd8e22ce55bc84788f946c5b3643ecac85b4591a9022100a4062074a1df3fa0aea5ef67368d0b1f0eaac520bee6e417c682d83cd04330450141048ef80f6bd6b073407a69299c2ba89de48adb59bb9689a5ab040befbbebcfbb15d01b006a6b825121a0d2c546c277acb60f0bd3203bd501b8d67c7dba91f27f47']

    > get_script(txh, 'outs')
    ['76a914946cb2e08075bcbaf157e47bcb67eb2b2339d24288ac', '76a914a41d15ae657ad3bfd0846771a34d7584c37d54a288ac']

    > get_script(txh)
    {'ins':  ['4830450221009e03bb6122437767e2ca785535824f4ed13d2ebbb9fa4f9becc6d6f4e1e217dc022064577353c08d8d974250143d920d3b963b463e43bbb90f3371060645c49266b90141048ef80f6bd6b073407a69299c2ba89de48adb59bb9689a5ab040befbbebcfbb15d01b006a6b825121a0d2c546c277acb60f0bd3203bd501b8d67c7dba91f27f47', '473044022035dd67d18b575ebd339d05ca6ffa1d27d7549bd993aeaf430985795459fc139402201aaa162cc50181cee493870c9479b1148243a33923cb77be44a73ca554a4e5d60141048ef80f6bd6b073407a69299c2ba89de48adb59bb9689a5ab040befbbebcfbb15d01b006a6b825121a0d2c546c277acb60f0bd3203bd501b8d67c7dba91f27f47', '483045022014daa5c5bbe9b3e5f2539a5cd8e22ce55bc84788f946c5b3643ecac85b4591a9022100a4062074a1df3fa0aea5ef67368d0b1f0eaac520bee6e417c682d83cd04330450141048ef80f6bd6b073407a69299c2ba89de48adb59bb9689a5ab040befbbebcfbb15d01b006a6b825121a0d2c546c277acb60f0bd3203bd501b8d67c7dba91f27f47'], 'outs': ['76a914946cb2e08075bcbaf157e47bcb67eb2b2339d24288ac', '76a914a41d15ae657ad3bfd0846771a34d7584c37d54a288ac']}

    > get_scriptpubkey('45138cc9dd17b13950230cd64d75891df829ec9b4b3e8aa3b9d2efbb3710965e:0')  # txid:idx
    '76a914946cb2e08075bcbaf157e47bcb67eb2b2339d24288ac'

    > get_scriptpubkey(txh, 0)  # or Tx hex, index   
    '76a914dd6cce9f255a8cc17bda8ba0373df8e861cb866e88ac'

Also works for `get_scriptsig`

    > get_scriptsig(txh, 0)
    '4830450221009e03bb6122437767e2ca785535824f4ed13d2ebbb9fa4f9becc6d6f4e1e217dc022064577353c08d8d974250143d920d3b963b463e43bbb90f3371060645c49266b90141048ef80f6bd6b073407a69299c2ba89de48adb59bb9689a5ab040befbbebcfbb15d01b006a6b825121a0d2c546c277acb60f0bd3203bd501b8d67c7dba91f27f47'

    > get_scriptsig('45138cc9dd17b13950230cd64d75891df829ec9b4b3e8aa3b9d2efbb3710965e:0')   # txid:out idx
    '483045022100b5809dab5c6769877e96b3d01f3397e845eaf8fa3156e45a78b22f8c56c9ed790220748538a23636121fc231cf20303f73dd782c9a346061e6597d1d993f754e51180141042daa93315eebbe2cb9b5c3505df4c6fb6caca8b756786098567550d4820c09db988fe9997d049d687292f815ccd6e7fb5c1b1a91137999818d17c73d0f80aef9'

    > get_outpoints(txo) 
    ['490a513c7e7bebaf3286c89c1ebc3dacc19d85f9b6c102cb98ae5883ae1a00d5:0', '7d0884926e6697906b1be2fd22f64dcab32f3135e85e81c9f6a0f6df55d62915:1', '805cd74ca322633372b9bfb857f3be41db0b8de43a3c44353b238c0acff9d523:1']

wizardofozzie/pybitcointools

Pybitcointools, Python library for Bitcoin signatures and transactions

Advantages:

Disadvantages:

Example usage (best way to learn :) ):

Listing of main commands: