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

Disadvantages:

• Not a full node, has no idea what blocks are
• Relies on centralized service (blockchain.info) for blockchain operations

Example usage (best way to learn :) ):

> from pybitcointools 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
'01000000025e46552eb977f908fa8b3ee9d2943a8fa6d96c3b768a5f250ce485acd8c7f797000000008b483045022100fc9ec3f6c66f630604e76309092ae00b48d39a83f8683bbf9d6310084e70eabd022058333d7a1d2158529ce39f9b48dea23dedefbe85028cdceab34e1ee9b1518c3201410420f34c2786b4bae593e22596631b025f3ff46e200fc1d4b52ef49bbdc2ed00b26c584b7e32523fb01be2294a1f8a5eb0cf71a203cc034ced46ea92a8df16c6e9ffffffff71d1abe4352100d4d837ca96c1a16947b5444f0f3e0bc645c430f704bb06c84c0100000000ffffffff01905f0100000000001976a9143ec6c3ed8dfc3ceabcc1cbdb0c5aef4e2d02873c88ac00000000'
> 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

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

• 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

• 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

• deserialize : (hex or bin transaction) -> JSON tx

• serialize : (JSON tx) -> hex or bin tx

• mktx : (inputs, outputs) -> 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

• pushtx : (hex or bin tx) -> tries to push to blockchain.info/pushtx