https://github.com/ppad-tech/tx

Minimalist transaction primitives.
https://github.com/ppad-tech/tx

bitcoin haskell tx

Last synced: about 6 hours ago
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Minimalist transaction primitives.

• Host: GitHub
• URL: https://github.com/ppad-tech/tx
• Owner: ppad-tech
• License: mit
• Created: 2026-04-18T11:56:24.000Z (2 months ago)
• Default Branch: master
• Last Pushed: 2026-05-16T16:29:08.000Z (about 1 month ago)
• Last Synced: 2026-05-16T18:36:23.793Z (about 1 month ago)
• Topics: bitcoin, haskell, tx
• Language: Haskell
• Homepage:
• Size: 43.9 KB
• Stars: 0
• Watchers: 0
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • Changelog: CHANGELOG
  • License: LICENSE
  • Agents: AGENTS.md

Awesome Lists containing this project

README

          
# ppad-tx

[![](https://img.shields.io/hackage/v/ppad-tx?color=blue)](https://hackage.haskell.org/package/ppad-tx)

![](https://img.shields.io/badge/license-MIT-brightgreen)

[![](https://img.shields.io/badge/haddock-tx-lightblue)](https://docs.ppad.tech/tx)

Minimal Bitcoin transaction primitives, including raw transaction

types, serialisation to/from bytes, txid computation, and sighash

calculation (legacy and BIP143 segwit).

## Usage

A sample GHCi session:

```

  > :set -XOverloadedStrings

  > import qualified Data.ByteString as BS

  > import qualified Data.ByteString.Base16 as B16

  > import Bitcoin.Prim.Tx

  > import Bitcoin.Prim.Tx.Sighash

  >

  > -- parse a raw transaction from hex

  > let raw = "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"

  > let Just tx = from_base16 raw

  >

  > -- compute the txid

  > let TxId tid = txid tx

  > B16.encode (BS.reverse tid)

  "f4184fc596403b9d638783cf57adfe4c75c605f6356fbc91338530e9831e9e16"

  >

  > -- round-trip serialisation

  > from_bytes (to_bytes tx) == Just tx

  True

  >

  > -- compute a legacy sighash

  > let scriptPubKey = BS.pack [0x76, 0xa9, 0x14]

  > let hash = sighash_legacy tx 0 scriptPubKey SIGHASH_ALL

  > BS.length hash

  32

```

## Documentation

Haddocks are hosted at [docs.ppad.tech/tx][hadoc].

## Security

This is a pre-release library that, at present, claims no security

properties whatsoever.

## Development

You'll require [Nix][nixos] with [flake][flake] support enabled.

Enter a development shell with:

```

$ nix develop

```

Then do e.g.:

```

$ cabal build

$ cabal test

$ cabal bench

```

[nixos]: https://nixos.org/

[flake]: https://nixos.org/manual/nix/unstable/command-ref/new-cli/nix3-flake.html

[hadoc]: https://docs.ppad.tech/tx