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 0.13.1

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 0.13.1
File	Size	Uploaded
tx_engine-0.13.1.tar.gz	585.5 kB	Oct 16, 2026	Details

Built distributions (wheels)

Table of built distributions (wheels) for tx-engine 0.13.1
File	Interpreter	ABI	Platform	Reset
tx_engine-0.13.1-cp311-abi3-win_amd64.whl 506.1 kB Oct 16, 2026	CPython 3.11	abi3	Windows x86-64	Details
tx_engine-0.13.1-cp311-abi3-win32.whl 467.1 kB Oct 16, 2026	CPython 3.11	abi3	Windows x86-32	Details
tx_engine-0.13.1-cp311-abi3-manylinux_2_17_x86_64.manylinux2014_x86_64.whl 617.3 kB Oct 16, 2026	CPython 3.11	abi3	Linux glibc 2.17+ x86-64	Details
tx_engine-0.13.1-cp311-abi3-macosx_11_0_arm64.whl 561.1 kB Oct 16, 2026	CPython 3.11	abi3	macOS 11.0+ ARM64	Details
tx_engine-0.13.1-cp311-abi3-macosx_10_12_x86_64.whl 603.8 kB Oct 16, 2026	CPython 3.11	abi3	macOS 10.12+ x86-64	Details

Total release size: 3.3 MB

Release files / tx_engine-0.13.1.tar.gz

Download URL	tx_engine-0.13.1.tar.gz
Size	585.5 kB
Tags	Source
SHA-256 checksum How to use checksums	`d45524a17491b0c88d00aa92a2fc42c9edd3b57abc2b9717805135f7ade908a3`
BLAKE2b-256 checksum How to use checksums	`53d6748ceaeb6ccb89b6aee4ebe3a3aa8ce76120a56e98c74729be43b106da59`
Upload date	Oct 16, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`maturin/1.15.0`

Release files / tx_engine-0.13.1-cp311-abi3-win_amd64.whl

Download URL	tx_engine-0.13.1-cp311-abi3-win_amd64.whl
Size	506.1 kB
Tags	CPython 3.11 Windows x86-64 abi3
SHA-256 checksum How to use checksums	`bb669a642a1ccfb9c5288e5bbc06f95e0df51a0b0343adc981bcb54d54f8e32d`
BLAKE2b-256 checksum How to use checksums	`68dd5c2364fb3140915d575b8a92222e21cc8158e9b4ed45082e48fe7feeece6`
Upload date	Oct 16, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`maturin/1.15.0`

Release files / tx_engine-0.13.1-cp311-abi3-win32.whl

Download URL	tx_engine-0.13.1-cp311-abi3-win32.whl
Size	467.1 kB
Tags	CPython 3.11 Windows x86-32 abi3
SHA-256 checksum How to use checksums	`c9e32354e7a1fc3a3e8133afb9eae6e9bad8767df3418b96ce4cc3377f110b4a`
BLAKE2b-256 checksum How to use checksums	`08569255c924cbfe4e0ab3fdf6668bd456e2c8b416be836a89cc364289d262b3`
Upload date	Oct 16, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`maturin/1.15.0`

Release files / tx_engine-0.13.1-cp311-abi3-manylinux_2_17_x86_64.manylinux2014_x86_64.whl

Download URL	tx_engine-0.13.1-cp311-abi3-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
Size	617.3 kB
Tags	CPython 3.11 Linux glibc 2.17+ x86-64 abi3
SHA-256 checksum How to use checksums	`ac44bbed8a5dfc1c8b30ee369a96a6955cf2e400de8ab9b965c4e205edf0184b`
BLAKE2b-256 checksum How to use checksums	`1c5be4251271449ecbefa25074620329a88b6dec1ab2506bf487403729d1bb7a`
Upload date	Oct 16, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`maturin/1.15.0`

Release files / tx_engine-0.13.1-cp311-abi3-macosx_11_0_arm64.whl

Download URL	tx_engine-0.13.1-cp311-abi3-macosx_11_0_arm64.whl
Size	561.1 kB
Tags	CPython 3.11 abi3 macOS 11.0+ ARM64
SHA-256 checksum How to use checksums	`2ed40fb3b2c799660350fefd567ccb19559e1facf2c0df57fcad553e57c59840`
BLAKE2b-256 checksum How to use checksums	`81f783feb3915ed285db855189638fff2ef29ca691c1c60479866c2bf833cc62`
Upload date	Oct 16, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`maturin/1.15.0`

Release files / tx_engine-0.13.1-cp311-abi3-macosx_10_12_x86_64.whl

Download URL	tx_engine-0.13.1-cp311-abi3-macosx_10_12_x86_64.whl
Size	603.8 kB
Tags	CPython 3.11 abi3 macOS 10.12+ x86-64
SHA-256 checksum How to use checksums	`5eebff7dd25b10b7d5aa01c0e54c6a3554fa189c0dae563aaa8ecf0eed3feb75`
BLAKE2b-256 checksum How to use checksums	`0b9982df53903cc675eda6f8650259eb2e9d04520dc1d9c0442ab336079c2e09`
Upload date	Oct 16, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`maturin/1.15.0`