# Harmony Stack and Projects

The goal of this page is to provide an overview of the open-source Harmony Tech Stack.

This is a living document and we are relying on our community to contribute to it and help maintain it. Please feel free to make edits and additions via pull requests. We apologize if we missed your project!

* [About](/home/developers/harmony-stack.md#clipboard-about)
* [Layers of Harmony Stack](/home/developers/harmony-stack.md#bookmark_tabs-layers-of-polkadot-stack)
  * [User Interface](/home/developers/harmony-stack.md#iphone-user-interface)
  * [Tools, APIs and Languages](/home/developers/harmony-stack.md#wrench-tools-apis-and-languages)
  * [Bridges, Fiat Gateways, Exchanges](/home/developers/harmony-stack.md#memo-bridges-fiat-gateways-exchanges)
  * [Platform Modules](/home/developers/harmony-stack.md#nut_and_bolt-platform-modules)
  * [Crypto Projects](/home/developers/harmony-stack.md#link-crypto-projects)
  * [Signatures](/home/developers/harmony-stack.md#black_nib-signatures-and-cryptography)
  * [Core Harmony Protocol](/home/developers/harmony-stack.md#satellite-core)
* [Contributing](/home/developers/harmony-stack.md#construction_worker-contributing)

## About

The Harmony Tech Stack consists of the **open-source** technologies contributing to and relying on [Harmony](https://harmony.one). It is meant to be used for decentralized application (Dapp) development within numerous verticals including DeFi, Gaming, Provenance and many others not pictured below.

## Layers of Harmony Stack

In the below sections you can find a list of different layers of the Harmony Stack.

### User Interface

| Components           | Existing projects                                                                                                                                                                                                             | Potentially interesting projects                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| -------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Wallets              | [Magic](https://magic.link/)                                                                                                                                                                                                  | <p>social recovery & one-time-password authenticators for on-chain fund</p><p></p><p>basic income & wealth from fixed-rate or high-yield investments  </p><p><br>User-friendly Wallet based on  open millions to self-custody assets & collectibles without hardware, password or hack </p><p><br><a href="https://github.com/hashmesan/harmony-totp">Composable Authentication</a> <br><a href="https://vitalik.ca/general/2021/01/11/recovery.html">Social onchain recovery</a> <br><a href="https://github.com/harmony-one/bounties/issues/35">EIP-2938 Account abstraction implementation</a> <br><a href="https://medium.com/@ronaldmannak/vivo-pay-a-zero-knowledge-payment-system-727997e4d25f">on-device privacy</a> <br>Keyless Security <br>web3 integrations <br><a href="https://github.com/harmony-one/bounties/issues/31">Harmony Argent Integration</a></p> |
| Browser Extensions   | [Harmony One Wallet](https://github.com/harmony-one/one-wallet), [Math Wallet](https://mathwallet.org/web/harmony), [Metamask](https://metamask.io/)                                                                          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
| Mobile Wallets       | [Frontier wallet](https://frontierwallet.com/), [Cobo Wallet](https://cobo.com/), [Math Wallet](https://mathwallet.org/), [Guarda](https://guarda.com/), [Edge](https://edge.app/), [imtoken](https://token.im/?locale=en-us) |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
| Hardware Wallets     | [Ledger](https://www.ledger.com/), [Trezor](https://trezor.io/), [SafePal](https://safepal.io/)                                                                                                                               |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
| Block Explorers      | [Harmony Explorer](https://explorer.harmony.one/)                                                                                                                                                                             | [Modular Explorer supporting HRC20 and HRC721](https://github.com/harmony-one/bounties/issues/37)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| Validator Dashboards | [Smartstake](https://harmony.smartstake.io/)                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
| Staking Rewards      | [Smartstake](https://harmony.smartstake.io/)                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
| Analytics            | [The Graph](https://docs.harmony.one/home/developers/tools/the-graph)                                                                                                                                                         | [Dune Analytics Integration](https://github.com/harmony-one/bounties/issues/39)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |

### Tools, APIs and Languages

| Components                      | Existing projects                                                                                               | Potentially interesting projects                                                                                                     |
| ------------------------------- | --------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------ |
| Easy Smart Contract Development | [Truffle](https://www.trufflesuite.com/), [Remix](https://remix.ethereum.org/), [Hardhat](https://hardhat.org/) |                                                                                                                                      |
| API                             |                                                                                                                 | [API for Cross Chain Aggregation](https://medium.com/harmony-one/how-to-aggregate-cross-chain-liquidity-e2ef97ba2bf6)                |
| Client Libraries                |                                                                                                                 |                                                                                                                                      |
| Runtime Security                |                                                                                                                 | Automated Runtime checking tools, economic audit simulator such as [gauntlet.](https://gauntlet.network/)[xyz](https://gauntlet.xyz) |

### Bridges, Fiat Gateways, Exchanges

| Components        | Existing projects                                                                                                                                                                                                                                                                                 | Potentially interesting projects                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| ----------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Bridges           | [Ethereum ](https://bridge.harmony.one/), [Binance](https://bridge.harmony.one/), [Polkadot - Edgeware](https://talk.harmony.one/t/everstake-polkadot-harmony-bridge/918)                                                                                                                         | <p><a href="https://docs.google.com/document/d/1Op1u9rbsR8sNwLblAYuFNONPCX5ODClVkOLt2mgBol0/edit#heading=h.wjz7s0uat2g5">Trustless ONE BTC Bridge</a>  <br><a href="https://github.com/harmony-one/bounties/issues/33">Celo Optics Bridge</a> <br><a href="https://github.com/certusone/wormhole">Solana Wormhole Bridge</a> <br><a href="https://github.com/cosmos/gravity-bridge">Cosmos Gravity Bridge</a> <br><a href="https://github.com/terra-money/shuttle">Terra Shuttle Bridge</a> <br> <a href="https://www.fusionite.info/post/dcrm-usecase-expanding-with-multichain-xyz">DCRM Multichain Bridge</a></p> |
| Fiat Gatways      | [Wyre](https://www.sendwyre.com/), [Swapzone](https://swapzone.io/), [Changelly](https://changelly.com/), [switchchain](https://www.switchain.com/), [swft](https://www.swft.pro/#/),  [SimpleSwap](https://simpleswap.io/), [simplex](https://www.simplex.com/), [transak](https://transak.com/) |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| Exchange Gateways | [Coinbase Rosetta](https://docs.cdp.coinbase.com/mesh/docs/welcome)                                                                                                                                                                                                                               | [Rosetta API Extension](https://github.com/harmony-one/bounties/issues/3)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |

### Platform Modules

| Components     | Existing projects                                                                                       | Potentially interesting projects                                                                                                                                                                                                                                                                                                                                                        |
| -------------- | ------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Security       | [Gnosis](https://gnosis.io/), [CertiK](https://www.certik.io/), [PeckShield](https://peckshield.com/en) | <p><a href="https://dl.acm.org/doi/abs/10.1145/1452044.1452049">coq verified execution</a> <br><a href="https://www.cs.cornell.edu/andru/papers/oakland21/">information-flow: compositional reentrancy</a> <br><a href="https://harmony.one/design">session types: language design</a> <br><a href="https://twitter.com/stse/status/1328128280868708353">smt: gas fee optimizer</a></p> |
| Oracle         | [Band Protocol](https://bandprotocol.com/)                                                              |                                                                                                                                                                                                                                                                                                                                                                                         |
| Privacy        |                                                                                                         |                                                                                                                                                                                                                                                                                                                                                                                         |
| Governance/DAO | [Harmony Governance](https://snapshot.org/#/harmony-mainnet.eth)                                        |                                                                                                                                                                                                                                                                                                                                                                                         |
| Cross Chain    |                                                                                                         | [Cross Chain Arts and Collectibles](https://dappradar.com/blog/upland-and-blockchain-heroes-create-cross-chain-nft-cards)                                                                                                                                                                                                                                                               |
| Finality       |                                                                                                         | <p><a href="http://mahdiz.com/?i=1">Madhi Zamani Instachain</a> <br><a href="https://github.com/harmony-one/bounties/issues/14">one second finality</a></p>                                                                                                                                                                                                                             |
| Name Service   | [1.country](https://1.country/)                                                                         |                                                                                                                                                                                                                                                                                                                                                                                         |

### Crypto Projects

| Components              | Existing projects                                                                                                                               | Potentially interesting projects                                                                                                                                                                                                                                                                                                                                                                                                          |
| ----------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| DeFi / Lending          | [Harmony Lend](https://lend.harmony.one), [Sushi](https://app.sushi.com/swap), [AAVE](https://aave.com/)                                        | DEX with privacy and confidentiality features such as those found in a [dark pool](https://en.wikipedia.org/wiki/Dark_pool)                                                                                                                                                                                                                                                                                                               |
| Automated Market Makers | [harmony swap](https://swap.harmony.one), [sushi](http://sushi.com/swap?chainId=1666600000), or [swoop aggregator](https://app.swoop.exchange/) |                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| NFT                     | [Harmony One Punks](https://www.harmonypunks.one/)                                                                                              | [NFT as a wallet profile](https://www.christies.com/features/10-things-to-know-about-CryptoPunks-11569-1.aspx)                                                                                                                                                                                                                                                                                                                            |
| MarketPlaces            | [lma-art-gallery](https://lma-art-gallery.com/)                                                                                                 | <p><a href="https://github.com/harmony-one/bounties/issues/48">ONE World: Geospatial NFT Marketplace</a> <br><a href="https://hbr.org/2007/10/the-art-of-designing-markets">Smart Markets for NFT'S</a></p>                                                                                                                                                                                                                               |
| Fixed Rate Income       |                                                                                                                                                 | <p><a href="https://research.paradigm.xyz/staking">Staking Derivatives</a> <br><a href="https://twitter.com/stse/status/1378877524432707587">Fixed Rate Lending</a> <br><a href="https://twitter.com/stse/status/1380695737131020289">Interest Rate Markets</a> <br><a href="https://www.ledgerinsights.com/municipal-bonds-blockchain-tokenization-consensys-broker-acquisition/">Security Tranches</a></p>                              |
| Cross chain DeFi        |                                                                                                                                                 | <p><a href="https://twitter.com/stse/status/1386794075123163137">Interest Free Stablecoin</a> <br><a href="https://docs.google.com/document/d/1i6KoxDMKKCy5zBwXVkkNgAxTUFZjBIboMQAZPBY7bRs/edit#">variable-rate lending</a> <br><a href="https://github.com/harmony-one/bounties/issues/35">Gas Fee Relay</a> <br><a href="https://www.notion.so/Harmony-EVM-Mixer-w-Bulletproofs-fdc691363fa946c2a24ec3141258bd31">Privacy Mixer</a></p> |
| Staking                 |                                                                                                                                                 |                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| Staking Derivatives     | [Stafi](https://stafi.io/)                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| Insurance               | [DSLA Protocol](https://stacktical.com/)                                                                                                        |                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| Lottery                 | <p><a href="https://high-stakes.life/">High Stakes</a><br><a href="https://taclabz.one/">TAC Alpha Lottery</a></p>                              |                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| Charity                 |                                                                                                                                                 |                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| Real Estate             | [Monopoly](https://mply.org/)                                                                                                                   |                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| Gaming                  | [Knight and Peasant](https://harmony.knightsandpeasants.one/)                                                                                   |                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| Travel                  | [Travala](https://www.travala.com/payment/harmony)                                                                                              |                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| Gambling                |                                                                                                                                                 |                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| Payroll                 |                                                                                                                                                 | [Decentralized Payroll Management for DAO's](https://medium.com/iearn/decentralized-payroll-management-for-daos-b2252160c543)                                                                                                                                                                                                                                                                                                             |
| Identity/DID            | [Hypersign Identity](https://hypersign.id)                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| Social Networking       |                                                                                                                                                 | [Social Referral](https://medium.com/terra-money/introducing-buzlink-scaling-social-referrals-5e08c2c65e8e)                                                                                                                                                                                                                                                                                                                               |
| Governance/DAO          | [snapshots](https://snapshot.org)                                                                                                               |                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| Other                   | [Knit Finance](https://knit.finance/#token-economy), [MakiMoon](https://maki.one/why), [harmony validators](https://www.harmonyvalidators.com/) |                                                                                                                                                                                                                                                                                                                                                                                                                                           |

### Signatures and Cryptography

| Components            | Existing projects | Potentially interesting projects                                                                                                                                                                                                                                                                                                                                                                |
| --------------------- | ----------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Cryptography          |                   | [evmcurve bls12-381](https://notes.ethereum.org/@poemm/evm384-update5#Gas-Estimates-for-BLS12-381-Operations)                                                                                                                                                                                                                                                                                   |
| Key Value Commitments |                   | [Key Value Commitments](https://eprint.iacr.org/2020/1161)                                                                                                                                                                                                                                                                                                                                      |
| BulletProof           |                   | [EVM Mixer with Bulletproofs](https://www.notion.so/Harmony-EVM-Mixer-w-Bulletproofs-fdc691363fa946c2a24ec3141258bd31)                                                                                                                                                                                                                                                                          |
| Privacy               |                   | [poseidon hash precompile using curve25519](https://blog.harmony.one/privacy-on-harmony-powered-by-webb/)                                                                                                                                                                                                                                                                                       |
| Light Clients         |                   | <p><a href="https://twitter.com/stse/status/1395033039168688134">superlight client, bootstrap without header sync</a> <br><a href="https://medium.com/harmony-one/dusk-network-and-harmony-partner-to-build-towards-the-first-industry-grade-zero-knowledge-proof-c7b16f740a84">lightclient: epoch synch</a></p>                                                                                |
| Zero Knowledge        |                   | [zksnark: plonk](https://medium.com/harmony-one/dusk-network-and-harmony-partner-to-build-towards-the-first-industry-grade-zero-knowledge-proof-c7b16f740a84)                                                                                                                                                                                                                                   |
| ethereum rollups      |                   | <p><a href="https://zksync.io/">zero knowledge proofs</a> <br><a href="https://medium.com/matter-labs/zkporter-a-breakthrough-in-l2-scaling-ed5e48842fbf">zk porter l2 scaling</a> <br><a href="https://medium.com/aztec-protocol/aztecs-zk-zk-rollup-looking-behind-the-cryptocurtain-2b8af1fca619">zk-zk-rollup</a> <br><a href="https://zkopru.network/">l2 for private transactions</a></p> |

### Core Harmony Protocol

| Components | Existing projects | Potentially interesting projects                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
| ---------- | ----------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Networking |                   | <p><a href="https://medium.com/harmony-one/harmonys-networking-story-7a83fb6f13ed">quic data transport</a> <br><a href="https://medium.com/harmony-one/harmonys-networking-story-7a83fb6f13ed">hipv2 node identity</a> <br><a href="https://medium.com/harmony-one/harmonys-networking-story-7a83fb6f13ed">raptorg multicast</a> <br><a href="https://github.com/harmony-one/bounties/issues/25">nkn message broadcast</a> <br><a href="https://medium.com/lazyledger/lazyledger-a-scalable-general-purpose-data-availability-layer-for-trust-minimized-sidechains-and-82d901963de9">Data Availability</a></p> |

## Contributing

Pull requests, issues, or other contributions from the community are encouraged! You can not only add specific projects, but also potentially interesting fields/areas which are currently missing in the tech stack.

:heavy\_exclamation\_mark: All technologies listed above need to be open-source. Ideally, the links lead directly to the code.

*Note: You will need a GitHub account to suggest changes or open issues. If you do not have one, you may* [*sign up for free*](https://github.com/join)*.*


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