Monthly Downloads: 9
Programming language: Haskell
License: Apache License 2.0
Tags: Cardano    
Latest version: v2.0.0

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Cardano Transactions


This library provides a simple interface for building transactions on Cardano. It also provides a small command-line interface for playing around in a terminal.


We call Payment a simple UTxO transactions with no metadata, moving funds from a set of inputs to a set of outputs.

Payments are constructed from a small set of primitives, following the given state-machine:

Example (Haskell)


{-# LANGUAGE NumericUnderscores #-}
{-# LANGUAGE OverloadedStrings #-}

import Data.Function
    ( (&) )
import Data.Maybe
    ( fromMaybe )
import Data.UTxO.Transaction.Cardano.Byron
    ( fromBase16
    , fromBase58
    , mkInput
    , mkOutput
    , mkSignKey
    , testnetMagic

import qualified Data.ByteString as BS
import qualified Data.UTxO.Transaction as Tx

Constructing Inputs / Outputs

-- Say we want to construct a transaction from a known input to two
-- different addresses. Let's start by constructing the primitive types
-- for /Byron/ by using the smart-constructors from:
--   'Data.UTxO.Transaction.Cardano.Byron'

let (Just input0) = mkInput 0 =<< fromBase16

let Just key0 = mkSignKey =<< fromBase16

let oneAda = 1_000_000

let (Just output0) = mkOutput oneAda =<< fromBase58

let (Just output1) = mkOutput oneAda =<< fromBase58

Constructing The Transaction

-- Next, we can construct the transaction using the DSL provided by:
--   'Data.UTxO.Transaction#MkPayment'

let eitherTx = Tx.empty testnetMagic
      & Tx.addInput input0
      & Tx.addOutput output0
      & Tx.addOutput output1
      & Tx.lock
      & Tx.signWith key0
      & Tx.serialize

Writing Binary Transaction to a File

-- Finally, let's export the binary transaction to a file, if we didn't screw
-- up the in the above example ^^"

case eitherTx of
  Left e ->
    fail $ show e
  Right bytes ->
    BS.writeFile "transaction.bin" bytes

Example (CLI)

cardano-tx empty 764824073 \
  | cardano-tx add-input 0 3b40265111d8bb3c3c608d95b3a0bf83461ace32d79336579a1939b3aad1c0b7 \
  | cardano-tx add-output 42 Ae2tdPwUPEZETXfbQxKMkMJQY1MoHCBS7bkw6TmhLjRvi9LZh1uDnXy319f \
  | cardano-tx lock \
  | cardano-tx sign-with e0860dab46f13e74ab834142e8877b80bf22044cae8ebab7a21ed1b8dc00c155f6b78eee2a5bbd453ce7e7711b2964abb6a36837e475271f18ff36ae5fc8af73e25db39fb78e74d4b53fb51776d0f5eb360e62d09b853f3a87ac25bf834ee1fb \
  | cardano-tx serialize

About Library Dependencies

This library requires quite a few exotic dependencies from the cardano realm which aren't necessarily on hackage nor stackage. The dependencies are listed in stack.yaml, make sure to also include those for importing cardano-transactions.


API documentation is available here.

End-to-end example of constructing transaction via cardano-tx and then submitting it.


Pull requests are welcome.

When creating a pull request, please make sure that your code adheres to our coding standards.

*Note that all licence references and agreements mentioned in the cardano-transactions README section above are relevant to that project's source code only.