Harmony is a powerful blockchain that is EVM comptible with sharding and staking features. For details about Harmony you can read more here. Developing on Harmony should feel very familiar for Ethereum developers, as we inherit almost all the tools and techniques like truffle, waffle, solidity, remix, wallets, etc.
The simplest way to interact with Harmony blockchain is via JSON RPCs.
curl command examples provided
To really explore the full potential of Harmony blockchain, creating a wallet is the next step.
Harmony CLI, also provides a quick way to create/manage wallet, interact with blockchain, etc.
Several development environments exists, as described in link
Multiple faucets to receive testnet funds here
Harmony blockchain explorers
Other SDKs include: Golang CLI, Java SDK, Python SDK
Note that, the Python SDK has only read-only features, meaning no transaction signing or smart contracts
For any issues and concerns navigate to our Github project repo, select the relevant project, and report the issue.
You can also join our developer discord channels (#developers, #development) to interact with Harmony engineers and other developers. This happens to be the fastest way to clarify or get answers to your technical questions. Specifically for the upcoming Hack The Horizon Hackathon, we have the following discord channels. We also have developers telegram group.
Only cross-shard native token (ONE token) transfers are allowed. No cross-shard for HRC20 or other contracts. Meaning, smart contracts are deployed on shard-0 and all contract interactions happen on shard-0. We have cross-shard smart contract on our roadmap for Q4, 2020 or early Q1, 2021.
Although Harmony is EVM comptabile, the Ethereum toolchain will not directly work with Harmony. For example, if you send a metamask transaction to Harmony; it won't be accepted. This is due to the fact that Harmony transactions must have shard field specified and the Ethereum transactions do not have this field, hence any transaction constructed using Ethereum tools will not directly work out of the box. However, we have mimicked all necessary tools like wallet, truffle, waffle, remix, etc, to provide seamless experience for developers familiar with Ethereum and other chains.
Builders of Decentralized Applications (DApps) can use familiar tools such as truffle and drizzle to build powerful applications all on Harmony's low cost, scalable high performance sharded blockchain.
Harmony wallet creators provide the link between Harmony's user community and the DApps and protocols built upon Harmony. They do this by providing the ability to store value, manage private keys and enabling the signing of transactions.
Harmony's explorer creators provide the ability for Harmony community to have transparency as to what is happening on Harmony's platform. They do this by providing user interfaces enabling an easy understanding of which validators are securing which shards, blocks and transactions are being processed as well as capabilities around transaction history for accounts and detailed transactional views.
Trading Partners are the bridge between Harmony and our Investor community. They provide supplemental tools such as Know Your Customer (KYC) and a trading platform which allow our investor and end user community to easily buy and exchange Harmony's native ONE token.l
Harmony validators or trust providers are the backbone of the Harmony infrastructure. As a decentralized platform these validators ensure consensus on blocks and transactions being processed on Harmony's sharded high performance platform.