Hyperledger Sawtooth

Hyperledger Sawtooth SDK

Hyperledger Sawtooth is an enterprise solution for building, deploying, and
running distributed ledgers (also called blockchains). It provides an extremely
modular and flexible platform for implementing transaction-based updates to
shared state between untrusted parties coordinated by consensus algorithms.

The Sawtooth Swift SDK provides a number of useful components that simplify
developing Swift applications which interface with the Sawtooth platform.


The Swift SDK’s SawtoothSigning module can be imported to a Cocoa/Cocoa Touch
project via Carthage, a dependency
manager for Cocoa applications.

  1. Install Carthage using
    these installation instructions.

  2. Create a Cartfile in the same directory where your .xcodeproj or
    .xcworkspace is.

  3. In the Cartfile for your project, add:

github "hyperledger/sawtooth-sdk-swift" "master"
  1. Run carthage update

After the framework is downloaded and built, it can be found at

  1. Add the built .framework binaries to the Embedded Binaries and Linked
    Frameworks and Libraries sections in your Xcode project.


  • Generate private/public key pairs
  • Sign transactions
  • Verify signatures

import SawtoothSigning

let context = Secp256k1Context()
let privateKey = context.newRandomPrivateKey()
let signer = Signer(context: context, privateKey: privateKey)
let signature = signer.sign(data: message_bytes)
context.verify(signature: signature, data: message_bytes,
  publicKey: signer.getPublicKey())

For full usage information, please refer to the Swift SDK documentation
included in this repository.


To generate the Swift SDK documentation from source:

  1. Install sphinx.

pip install -U Sphinx
  1. Install the sphinx theme used by the Sawtooth documentation using pip.

pip install sphinx_rtd_theme
  1. In the sawtooth-sdk-swift/docs directory run

make html

Sphinx generates the documentation and puts it in the folder

  1. To open the index file, run

open _build/html/index.html

For more information, please see the
Hyperledger Sawtooth documentation,
especially the
Application Developer’s Guide.


Hyperledger Sawtooth software is licensed under the
Apache License Version 2.0 software license.


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