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 0.11.5

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 0.11.5
File	Size	Uploaded
tx_engine-0.11.5.tar.gz	525.0 kB	Sep 23, 2026	Details

Built distributions (wheels)

Table of built distributions (wheels) for tx-engine 0.11.5
File	Interpreter	ABI	Platform	Reset
tx_engine-0.11.5-cp311-abi3-win_amd64.whl 986.3 kB Sep 23, 2026	CPython 3.11	abi3	Windows x86-64	Details
tx_engine-0.11.5-cp311-abi3-win32.whl 893.1 kB Sep 23, 2026	CPython 3.11	abi3	Windows x86-32	Details
tx_engine-0.11.5-cp311-abi3-manylinux_2_17_x86_64.manylinux2014_x86_64.whl 1.1 MB Sep 23, 2026	CPython 3.11	abi3	Linux glibc 2.17+ x86-64	Details
tx_engine-0.11.5-cp311-abi3-macosx_11_0_arm64.whl 1.0 MB Sep 23, 2026	CPython 3.11	abi3	macOS 11.0+ ARM64	Details
tx_engine-0.11.5-cp311-abi3-macosx_10_12_x86_64.whl 1.1 MB Sep 23, 2026	CPython 3.11	abi3	macOS 10.12+ x86-64	Details

Total release size: 5.6 MB

Release files / tx_engine-0.11.5.tar.gz

Download URL	tx_engine-0.11.5.tar.gz
Size	525.0 kB
Tags	Source
SHA-256 checksum How to use checksums	`f0d6438c6a159881ce9179b14c0e70e643d82ee71a90684067e8e2283fd5f979`
BLAKE2b-256 checksum How to use checksums	`9ac6b04d3907bf8c63a578b4a5bb14986207ea90b161dc3dd0c7025e5b557267`
Upload date	Sep 23, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`maturin/1.15.0`

Release files / tx_engine-0.11.5-cp311-abi3-win_amd64.whl

Download URL	tx_engine-0.11.5-cp311-abi3-win_amd64.whl
Size	986.3 kB
Tags	CPython 3.11 Windows x86-64 abi3
SHA-256 checksum How to use checksums	`6ca664619c46097e87dfa39c75cd23828e00bd0b04c81a28d125dc90ae3b21bb`
BLAKE2b-256 checksum How to use checksums	`a471058fbe2600280b14188ef1a33cc51caed990bacd6175896aec608444c7f6`
Upload date	Sep 23, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`maturin/1.15.0`

Release files / tx_engine-0.11.5-cp311-abi3-win32.whl

Download URL	tx_engine-0.11.5-cp311-abi3-win32.whl
Size	893.1 kB
Tags	CPython 3.11 Windows x86-32 abi3
SHA-256 checksum How to use checksums	`b8c76726068cee5559a2d3bea204483ee34e56b99d1c182f235c6f773a74e94b`
BLAKE2b-256 checksum How to use checksums	`db8d1b7dfe30b842c56973ac829fe7d0cda6a908a5cab5d11e365f487e517f76`
Upload date	Sep 23, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`maturin/1.15.0`

Release files / tx_engine-0.11.5-cp311-abi3-manylinux_2_17_x86_64.manylinux2014_x86_64.whl

Download URL	tx_engine-0.11.5-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	`7acea394097571325af60e159450b4f4f0b40645c1ce86d6bbc1483b38b928ed`
BLAKE2b-256 checksum How to use checksums	`e9b4b83ceb9eba277a4dd8ad20687e91f5592e65c84b835c972a7e17ff68701b`
Upload date	Sep 23, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`maturin/1.15.0`

Release files / tx_engine-0.11.5-cp311-abi3-macosx_11_0_arm64.whl

Download URL	tx_engine-0.11.5-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	`a810db036fa767cc4ed509524290b04645016702214f04f8843f7615cbe0abde`
BLAKE2b-256 checksum How to use checksums	`36c159bb256e15a1117e4e78858dcf79a1f86c22aed34c1aca916fbc915c93fa`
Upload date	Sep 23, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`maturin/1.15.0`

Release files / tx_engine-0.11.5-cp311-abi3-macosx_10_12_x86_64.whl

Download URL	tx_engine-0.11.5-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	`4e448bc56bdd39cc1ef200f8e87aa79bd748a0cac43e5c164b302d89915c531c`
BLAKE2b-256 checksum How to use checksums	`cdfbc3b761bda62d03bdf57e702dc4fe54712c8ffb5a3cf1debac7f03cf63db3`
Upload date	Sep 23, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`maturin/1.15.0`