Binance Chain Transaction Library

This library provides a low-level interface for interacting with different Binance Chain transactions.

Installation

pip3 install bnb-tx

Or, in your Pipfile:

bnb-tx = "==0.0.4"

Usage

The following is an example that uses the ecdsa library to sign.

import ecdsa
def uncompressed_public_key(sk):
    """ Derive uncompressed public key """
    order = sk.curve.generator.order()
    p = sk.verifying_key.pubkey.point
    x_str = ecdsa.util.number_to_string(p.x(), order)
    y_str = ecdsa.util.number_to_string(p.y(), order)
    uncompressed = b'\x04' + x_str + y_str
    return uncompressed


from binance_transaction import BnbTransaction, NewOrder, address_bytes, BUY, GTE, LIMIT_ORDER

sk = ecdsa.SigningKey.from_pem(open('secp256k1-key.pem').read())
from_address = 'bnb100dxzy02a6k7vysc5g4kk4fqamr7jhjg4m83l0'
account_number = 96025  # https://docs.binance.org/api-reference/dex-api/paths.html#apiv1accountaddress
sequence_number = 888
tx = BnbTransaction(account_number, sequence_number)
order_id = f'{address_bytes(from_address).hex().upper()}-{sequence_number + 1}'
tx.add_msg(NewOrder(from_address, order_id, 'BNB_TUSDB-888', LIMIT_ORDER, BUY, 3500000000, 500000000, GTE))
print(tx.signing_json())
sig = sk.sign_digest(tx.signing_hash())
public_key = uncompressed_public_key(sk)
tx.apply_sig(sig, public_key)
signed_transaction_bytes = tx.encode()
print(f'Signed bytes: {signed_transaction_bytes.hex()}')

Support

Not all transaction types are supported. Please consult this table for details. If you need support, please submit a pull request.

Message Type	encode	decode	from_obj
Send	✅		✅
NewOrder	✅		✅
CancelOrder	✅		✅
Issue	✅		✅
Mint	✅		✅
Burn	✅		✅
Freeze	✅		✅
Unfreeze	✅		✅
TimeLock	✅		✅
TimeUnlock	✅		✅
TimeRelock	✅		✅
Proposal	✅		✅
Vote	✅		✅

Contributing

See CONTRIBUTING.

License

LGPLv3