TX Engine
Python interface for building Bitcoin SV scripts and transactions. The native core is the Rust chain-gang library.
Requires Python 3.11+. Install from PyPI:
pip install tx-engine
Documentation
| Topic | Link |
|---|---|
| Documentation index | docs/README.md |
| Python class reference | docs/Python-API.md |
| HD wallets (mnemonic, BIP-44) | docs/BIP-32-Python.md |
| Chronicle (Python examples) | docs/Chronicle-Python.md |
| Chronicle (full spec) | docs/Chronicle.md |
| Local development | python/README.md |
Quick example
from tx_engine import Tx
src_tx = (
"0100000001c7151ebaf14dbfe922bd90700a7580f6db7d5a1b898ce79cb9ce459e17f1290900000000"
"6b4830450221008b001e8d8110804ac66e467cd2452f468cba4a2a1d90d59679fe5075d24e5f530220"
"6eb04e79214c09913fad1e3c0c2498be7f457ed63323ac6f2d9a38d53586a58d41210395deb00349c0ae7"
"3412a55bec70a7793fc6860a193d29dd61d73c6271ffcbd4cffffffff0103000000000000001976a914"
"96795fb99fd6c0f214f7a0e96019f642225f52d288ac00000000"
)
tx = Tx.parse_hexstr(src_tx)
print(tx)
Chronicle upgrade
Bitcoin SV Chronicle is supported in both the Rust library and Python bindings. Guide: docs/Chronicle-Python.md.
Chronicle script rules apply when tx.version > 1. Use version: 2 (or higher) on spending transactions to opt in.
| Check | Python API |
|---|---|
| Version-only (offline / mempool-style) | Tx.validate(utxos) |
| Consensus at a known block height | Tx.validate_at_height(utxos, block_height, network) — network is BSV_Mainnet, BSV_Testnet, or BSV_STN |
| Script debugger / partial eval | Context(tx_version=2, lock_script=...) |
See docs/Chronicle.md for sighash routing, opcodes, two-phase evaluation, malleability rules, and script number limits.
HD wallets
BIP-32 / BIP-39 / BIP-44 support via HdWallet and watch-only HdWatchWallet. Guide: docs/BIP-32-Python.md.
from tx_engine import HdWallet, bsv_coin_type
hd = HdWallet.from_mnemonic("BSV_Mainnet", "abandon abandon ... about")
print(hd.address_at_bip44(bsv_coin_type(), 0, True, 0))
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