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 0.11.6

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 0.11.6
File	Size	Uploaded
tx_engine-0.11.6.tar.gz	529.4 kB	Oct 6, 2026	Details

Built distributions (wheels)

Table of built distributions (wheels) for tx-engine 0.11.6
File	Interpreter	ABI	Platform	Reset
tx_engine-0.11.6-cp311-abi3-win_amd64.whl 983.6 kB Oct 6, 2026	CPython 3.11	abi3	Windows x86-64	Details
tx_engine-0.11.6-cp311-abi3-win32.whl 892.7 kB Oct 6, 2026	CPython 3.11	abi3	Windows x86-32	Details
tx_engine-0.11.6-cp311-abi3-manylinux_2_17_x86_64.manylinux2014_x86_64.whl 1.1 MB Oct 6, 2026	CPython 3.11	abi3	Linux glibc 2.17+ x86-64	Details
tx_engine-0.11.6-cp311-abi3-macosx_11_0_arm64.whl 1.0 MB Oct 6, 2026	CPython 3.11	abi3	macOS 11.0+ ARM64	Details
tx_engine-0.11.6-cp311-abi3-macosx_10_12_x86_64.whl 1.1 MB Oct 6, 2026	CPython 3.11	abi3	macOS 10.12+ x86-64	Details

Total release size: 5.6 MB

Release files / tx_engine-0.11.6.tar.gz

Download URL	tx_engine-0.11.6.tar.gz
Size	529.4 kB
Tags	Source
SHA-256 checksum How to use checksums	`e6a8f02193f76e64c88225aabde07b9021959a72dde0dcd3148daf3b1ec76de2`
BLAKE2b-256 checksum How to use checksums	`8d5759ee952e7e2bddd4ea515b4cbb988402a87dd31dbccaa2416cfb29b4647f`
Upload date	Oct 6, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`maturin/1.15.0`

Release files / tx_engine-0.11.6-cp311-abi3-win_amd64.whl

Download URL	tx_engine-0.11.6-cp311-abi3-win_amd64.whl
Size	983.6 kB
Tags	CPython 3.11 Windows x86-64 abi3
SHA-256 checksum How to use checksums	`aabc060ae37dc32a058bc445d9f36b274937c139592531c1a21e14360f0e7ee1`
BLAKE2b-256 checksum How to use checksums	`526cf0d47fe46a24dbacb602a7ccf6c5a383d355999db0f10fa2d19b7db64f35`
Upload date	Oct 6, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`maturin/1.15.0`

Release files / tx_engine-0.11.6-cp311-abi3-win32.whl

Download URL	tx_engine-0.11.6-cp311-abi3-win32.whl
Size	892.7 kB
Tags	CPython 3.11 Windows x86-32 abi3
SHA-256 checksum How to use checksums	`6dea783a8d53eb4c211b0699fba362cd2178fccd3c45a7d8e62fdbc4f83ac566`
BLAKE2b-256 checksum How to use checksums	`bc2f2ffd7152e95f01421fe5d76a5fae5b36983a681f1dddf47bc69d4110235e`
Upload date	Oct 6, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`maturin/1.15.0`

Release files / tx_engine-0.11.6-cp311-abi3-manylinux_2_17_x86_64.manylinux2014_x86_64.whl

Download URL	tx_engine-0.11.6-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	`c9ccf8066354c9d9541aa16bd232baa1ef5de526236b86517d1109909a1b3d3d`
BLAKE2b-256 checksum How to use checksums	`7a50ca1a60aad34b41cee0a6423552e4642b07a31afaafc2cef1a933f297e5b5`
Upload date	Oct 6, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`maturin/1.15.0`

Release files / tx_engine-0.11.6-cp311-abi3-macosx_11_0_arm64.whl

Download URL	tx_engine-0.11.6-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	`cf0fdff44c562b0333ab85f9a8426ad12050335882c5a570ae2a3c7db2d4128a`
BLAKE2b-256 checksum How to use checksums	`58a2f98cb7866ac1c082dbd7221b329d23372979d54b84e57b7e3fbcf9a37f1d`
Upload date	Oct 6, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`maturin/1.15.0`

Release files / tx_engine-0.11.6-cp311-abi3-macosx_10_12_x86_64.whl

Download URL	tx_engine-0.11.6-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	`0e0378eb91336bb1f3d5dfa906f6064af0f8a790da1de9634141ad716ebba130`
BLAKE2b-256 checksum How to use checksums	`2c0cb1fcf70c64174d84d4b0a5ecfbfd13880d613e0981224df2e89fabe1db49`
Upload date	Oct 6, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`maturin/1.15.0`