hashgraph/hedera-sdk-java

Distributed Ledger Libraries

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Created about 6 years ago
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hashgraph/hedera-sdk-java

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Hedera™ Hashgraph SDK for Java

Hedera™ Hashgraph Java SDK

The Java SDK for interacting with Hedera Hashgraph: the official distributed consensus platform built using the hashgraph consensus algorithm for fast, fair and secure transactions. Hedera enables and empowers developers to build an entirely new class of decentralized applications.

NOTE: v1 of the SDK is deprecated and support was discontinued after October 2021. Please install the latest version 2.x.x or migrate from v1 to the latest 2.x.x version. You can reference the migration documentation.

Java app quickstart

The Java application quickstart guide covers how to properly set up the dependencies needed to start developing your Java project using the Hedera™ Java SDK.

Android app quickstart

The Android application quickstart guide covers how to properly set up the dependencies needed to start developing your Android project using the Hedera™ Java SDK.

Examples

This repository includes Java examples and an Android example that showcase different use cases and workflows.

Developer quickstart

The developer quickstart guide provides instructions on how to set up the environment, run unit and integration tests, and configure the project to work with different networks such as the Hedera test network, preview network, etc.

Support

If you have a question on how to use the product, please see our support guide.

Contributing

We welcome participation from all developers!
For instructions on how to contribute to this repo, please review the Contributing Guide.
More instructions for contribution can be found in the Global Contributing Guide.

Code of Conduct

This project is governed by the Contributor Covenant Code of Conduct. By participating, you are expected to uphold this code of conduct.

License

Apache License 2.0

hedera-services

Crypto, token, consensus, file, and smart contract services for the Hedera public ledger

awesome-hashgraph

Hashgraph is a superior consensus mechanism / data structure alternative to blockchain.

hedera-sdk-js

Hedera™ Hashgraph SDK for JavaScript/TypeScript

hedera-improvement-proposal

Hedera Improvement Proposal

hedera-mirror-node

Hedera Mirror Node archives data from consensus nodes and serves it via an API

guardian

The Guardian is an innovative open-source platform that streamlines the creation, management, and verification of digital environmental assets. It leverages a customizable Policy Workflow Engine and Web3 technology to ensure transparent and fraud-proof operations, making it a key tool for transforming sustainability practices and carbon markets.

hedera-sdk-go

Hedera™ Hashgraph SDK for Go

hedera-hts-demo

This is a demonstration UI for the Hedera Token Service. Written in JavaScript and Vue.JS

MyHbarWallet

🟩 MyHbarWallet is a free, client-side interface helping you interact with Hedera™ Hashgraph.

hedera-docs

Welcome to the official Hedera documentation repository.

hedera-local-node

Run your own local Hedera network for development purposes.

hedera-json-rpc-relay

Implementation of Ethereum JSON-RPC APIs for Hedera

hl-mercury

Hashgraph implementation of functionality similar to Hyperledger

hedera-smart-contracts

Contains Hedera Smart Contract Service supporting files

hedera-platform

Swirlds Hashgraph Platform SDK open source code.

hedera-protobufs-java

The protobuf message files defining the Hedera Hashgraph API

stablecoin-studio

All-in-one stablecoin configuration, issuance, and management

hedera-nft-minter

Mintbar is an open source NFT minter webapp for the Hedera ecosystem.

hedera-proof-of-action-microservice

Hedera™ Hashgraph Proof-of-Action Microservice

hedera-sdk-rust

The Hedera™ Rust SDK

hedera-hcs-chat-js

An example chat application, which uses the Hedera Consensus Service for pub-sub messaging.

hedera-nft-auction-demo

Demo NFT auction

did-sdk-js

Javascript SDK for managing DID Documents & Verifiable Credentials

hedera-protobufs

Authoritative source of Hedera protobufs

hedera-stable-coin-solidity-ethereum

Hedera Stable Coin implementation as a Solidity smart contract for Ethereum

hedera-hcs-sxc-java

The HCS SXC (SDK eXtension Components) is a set of pre-built components that aim to provide additional functionality over and above the java SDK for HCS to make it easier and quicker to develop applications. This repository is only intended for demo purposes and not production applications.

hedera-smart-contract-starter

This smart contract starter on Hedera helps developers create upgradeable contracts using a proxy pattern for seamless upgrades. Includes a sample contract and documentation for a quick start.

hedera-mirror-node-explorer

Hedera Mirror Node Explorer for the Hedera Hashgraph DLT.

did-sdk-java

Support for the Hedera Hashgraph DID Method and Verifiable Credentials on the Hedera Java SDK

pbj

A performance optimized Google Protocol Buffers code generator, parser, and Gradle module.

did-method

Hedera Hashgraph Decentralized Identifier (DID) method specification

ledger-app-hedera

Hedera wallet application for Ledger Nano S

hedera-wallet-connect-js

This package is a messaging relay between decentralized applications and wallets in Hedera network based on Wallet Connect relays.

corda-notary-hedera

hedera-sdk-swift

Hedera™ SDK for Swift

hedera-stable-coin-demo

hedera-accelerator-defi-dex-ui

hedera-sdk-cpp

C++ SDK for Hedera

hedera-fee-tool-js

Tool to calculate price of transactions on Hedera network

hedera-cli

Hedera command line tools for developers

hedera-hcs-token-example

This is a sample implementation of an ERC20 like token in a Hedera Consensus Service(HCS) decentralised application

hedera-wallet-connect

This package is a messaging relay between decentralized applications and wallets in Hedera network based on Wallet Connect relays.

hedera-smart-contracts-libs-lab

Smart contract examples in various languages showing use of Hedera SDKs in tandem with public libraries

hedera-transaction-tool-demo

The Hedera Transaction Tool demo application.

hedera-stablecoin-demo-archived

hedera-hcs-erc721-sample

Hedera ERC-721 Equivalent Contract for Hedera Consensus Service.

hedera-hardhat-example-project

An example Hedera Hardhat project where you can use an instance of the Hedera JSON RPC Relay to test and deploy a smart contract.

hedera-sdk-reference

Hedera SDK specification repository.

hedera-accelerator-defi-dex

hedera-nft-sdk

Hedera NFT Utilities SDK for JavaScript

hedera-sourcify

Tools for verifying Hedera smart contracts using standard open source libraries.

hedera-hardhat-hethers

DEPRECATED Hardhat plugin for integration with hethers.js.

hedera-proof-of-action-demo-pasteboard

Showcases the Hedera™ Proof-of-Action (PoA) API via a toy image pasteboard.

hedera-stable-coin

hashgraph-defi-alliance

log4j2-hedera

Provides Log4j 2.x support for Hedera™ via an Appender that records logged events using the Hedera™ Consensus Service (HCS).

hedera-protobufs-go

Generated protobufs in Go for interacting with Hedera™ Hashgraph

hedera-metamask-snaps

Metamask snaps offer the ability to create npm package that can be used to enhance the wallet capabilities for chains and DApps.

partners-handbook

Onboarding handbook for Hedera Partners

fabric-samples-hcs

hedera-subgraph-example

The Hedera Subgraph Example Project demonstrates how to create and deploy a subgraph to a local graph node using The Graph Protocol.

.github

Default GitHub configuration for the Hashgraph organization

fabric-hcs

hedera-theft-prevention-demo

Demonstrates a theft prevention use case using proof of action

hello-hedera-audit-log-go

Contributed by the AdsDax team. This demo application was created using the Hedera Go SDK that shows the end-to-end process as events are tracked, sent to the Hedera network and then collected after being processed by the Consensus Service.

full-stack-testing

JUnit 5 extensions and supporting libraries for performing Full Stack Testing of the Hedera Services application.

solo

An opinionated CLI tool to deploy and manage standalone test networks.

hcscli

This is a temporary tool developed during integrating Hedera Consensus Service with Hyperledger Fabric.

hedera-block-node

New Block Node services

hedera-grpcWeb-proxy

Envoy proxy docker and docker-compose for Hedera testnet and mainnet consensus nodes

hedera-state-proof-verifier-go

State Proof Verifier library for Hedera in Go lang

hedera-hcs-corda-demo

Integrating R3 Corda IOU Demo with the Hedera Consensus Service.

hedera-exchange-rate-tool

Hedera Exchange Rate Tool to send median of HBAR/USD exchange rate from various Exchanges to Hedera Network

logstash-output-hedera

hedera-hcs-s3-monitor-java

Lambda function which monitors an S3 bucket and creates HCS transactions on changes made to files in the bucket

hedera-sdk-tck

A TCK (Technology Compatibility Kit) used to verify compliant implementations of a Hedera SDK

hedera-custodians-library

The hedera-custodians-library library is a Typescript utility designed to simplify custodial wallet management. It provides developers with tools to abstract complex aspects of custodial wallets, allowing them to focus on their application's core logic.

hedera-the-graph

Tools for hosting a graph node for the Hedera community.