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))

Metadata

Release files for tx-engine 0.11.1

For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.

Source distribution (sdist)

Source distribution for tx-engine 0.11.1
File	Size	Uploaded
tx_engine-0.11.1.tar.gz	504.5 kB	Sep 8, 2026	Details

Built distributions (wheels)

Table of built distributions (wheels) for tx-engine 0.11.1
File	Interpreter	ABI	Platform	Reset
tx_engine-0.11.1-cp311-abi3-win_amd64.whl 983.2 kB Sep 8, 2026	CPython 3.11	abi3	Windows x86-64	Details
tx_engine-0.11.1-cp311-abi3-win32.whl 889.8 kB Sep 8, 2026	CPython 3.11	abi3	Windows x86-32	Details
tx_engine-0.11.1-cp311-abi3-manylinux_2_17_x86_64.manylinux2014_x86_64.whl 1.1 MB Sep 8, 2026	CPython 3.11	abi3	Linux glibc 2.17+ x86-64	Details
tx_engine-0.11.1-cp311-abi3-macosx_11_0_arm64.whl 1.0 MB Sep 8, 2026	CPython 3.11	abi3	macOS 11.0+ ARM64	Details
tx_engine-0.11.1-cp311-abi3-macosx_10_12_x86_64.whl 1.1 MB Sep 8, 2026	CPython 3.11	abi3	macOS 10.12+ x86-64	Details

Total release size: 5.6 MB

Release files / tx_engine-0.11.1.tar.gz

Download URL	tx_engine-0.11.1.tar.gz
Size	504.5 kB
Tags	Source
SHA-256 checksum How to use checksums	`73e0b370e92209b042ec3ac2db51ea80736d7ccbfc127646aeda6ffb495d49a0`
BLAKE2b-256 checksum How to use checksums	`c1bbb4571178cefcbe737c3f8704214d27434dd01509b478ac50e25d452c861f`
Upload date	Sep 8, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`maturin/1.15.0`

Release files / tx_engine-0.11.1-cp311-abi3-win_amd64.whl

Download URL	tx_engine-0.11.1-cp311-abi3-win_amd64.whl
Size	983.2 kB
Tags	CPython 3.11 Windows x86-64 abi3
SHA-256 checksum How to use checksums	`87573215b86b25bc8f529b7425b31bc127beb0fb5e4632071dcbffdc51ef49b5`
BLAKE2b-256 checksum How to use checksums	`7688b7ca653051791b3070fe8d328563f69643a416247aa179d64fe5668c313e`
Upload date	Sep 8, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`maturin/1.15.0`

Release files / tx_engine-0.11.1-cp311-abi3-win32.whl

Download URL	tx_engine-0.11.1-cp311-abi3-win32.whl
Size	889.8 kB
Tags	CPython 3.11 Windows x86-32 abi3
SHA-256 checksum How to use checksums	`425d8af965a175b3d31bbaad6b7fd90ed3b343f8f9d6cfc792bb65bca42c2f66`
BLAKE2b-256 checksum How to use checksums	`a9084bc33cd908f1a85b2195120a173027b0bef3e0a5ce211c99c5caecb0af5b`
Upload date	Sep 8, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`maturin/1.15.0`

Release files / tx_engine-0.11.1-cp311-abi3-manylinux_2_17_x86_64.manylinux2014_x86_64.whl

Download URL	tx_engine-0.11.1-cp311-abi3-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
Size	1.1 MB
Tags	CPython 3.11 Linux glibc 2.17+ x86-64 abi3
SHA-256 checksum How to use checksums	`3b31ce2a3d4582685c8595ea08fae6a90ab1457d1aeb5631bd14312db9653739`
BLAKE2b-256 checksum How to use checksums	`f58e2676eda0fe697dce5a723bb471e743c61984566c943cd7116315141e3143`
Upload date	Sep 8, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`maturin/1.15.0`

Release files / tx_engine-0.11.1-cp311-abi3-macosx_11_0_arm64.whl

Download URL	tx_engine-0.11.1-cp311-abi3-macosx_11_0_arm64.whl
Size	1.0 MB
Tags	CPython 3.11 abi3 macOS 11.0+ ARM64
SHA-256 checksum How to use checksums	`9ed6c67156f2623f4c30f339167dcec85fdd9684c7bded19e81a3ff0f7df34be`
BLAKE2b-256 checksum How to use checksums	`e2ddf9b9b26c8a88a87108923dbd84013db6986893f50b3bd1c401d4cb5883dc`
Upload date	Sep 8, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`maturin/1.15.0`

Release files / tx_engine-0.11.1-cp311-abi3-macosx_10_12_x86_64.whl

Download URL	tx_engine-0.11.1-cp311-abi3-macosx_10_12_x86_64.whl
Size	1.1 MB
Tags	CPython 3.11 abi3 macOS 10.12+ x86-64
SHA-256 checksum How to use checksums	`ba3a5c455bd5b9d6f6a7895c78fd553bbf1e262f1ecd5bfeba81c9b2eaddaf49`
BLAKE2b-256 checksum How to use checksums	`d30968d6be67adf51a56f2b71c480ed2bf5fa6af062d44513521aee3bc4271ce`
Upload date	Sep 8, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`maturin/1.15.0`