# Auromony: Aurora ⇄ Harmony Bridge **URL:** \ **Category:** zkDAO\ **Created:** [June 10, 2022, 5:43pm UTC](https://talk.harmony.one/t/auromony-aurora-harmony-bridge/19844 "2022-06-10T17:43:18Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![Globallager](https://yyz1.discourse-cdn.com/flex035/user_avatar/talk.harmony.one/globallager/32/8966_2.png) [@Globallager](https://talk.harmony.one/u/Globallager)\ **Post date:** [June 10, 2022, 5:43pm UTC](https://talk.harmony.one/t/auromony-aurora-harmony-bridge/19844/1 "2022-06-10T17:43:18Z")
Auromony sets out to be a trustless asset bridge between Harmony and Aurora (EVM environment on NEAR Protocol). # Application Type zkDAO # Proposal Overview The scope of this proposal covers the research and development of a trustless bridge between Harmony and Aurora ultimately powered by ZK. The current MVP supports bridging of USDC on mainnets with limited initial liquidity ($10 on Aurora and Harmony respectively) powered by HTLCs. # Technical Details The current MVP is a custom build of [Connext](https://www.connext.network/) that enables trustless briding based on Hash Time Locked Contracts (HTLCs). Given the immaturity of ZK light clients at the time of starting the project, the MVP was deliberately chosen to adopt [local verifiactions](https://blog.connext.network/the-interoperability-trilemma-657c2cf69f17) instead to maintain the trustless status of a usable prototype that can be developed within a limited timeframe. The architecture of the current MVP involves the components listed below. If you are interested in more details, you may refer to the demonstration video linked in the last section of this proposal or the documentations within the corresponding repositories. ## Backend - [nxtp](https://github.com/Auromony/nxtp) - [NATS](https://github.com/Auromony/NATS) - [graph-node](https://github.com/Auromony/graph-node) - [subgraph-cache-server](https://github.com/Auromony/subgraph-cache-server) ## Frontend - [coinhippo-bridge](https://github.com/Auromony/coinhippo-bridge) - [chaindata](https://github.com/Auromony/chaindata) # Use Cases ## Cross-chain Activities Starting with one of the most liquid cryptoassets, Auromony will provide users a secure solution when transferring and using their beloved cryptoassets across both chains for payments, trades, bids, etc. ## Aurora Gas Funding As gas on Aurora is denominated in ETH, bridging ETH from other means through Harmony could be an economical solution to fund an Aurora wallet versus e.g. bridging from Ethereum with future support of ETH bridging on Auromony. # Competitive Landscape ## Harmony Horizon Current implementation: > **[Harmony ONE-ETH Bridge](https://bridge.harmony.one/)** Light client based version, currently in development: > **[GitHub - harmony-one/horizon: Horizon - a trustless harmony to ethereum bridge](https://github.com/harmony-one/horizon)** > > Horizon - a trustless harmony to ethereum bridge Harmony’s “official” bridge. Support for bridging to Aurora is neither available nor announced. Bridging to Aurora using Horizon’s mint-burn model would also create Aurora versions of Ethereum assets on Harmony that could deteriorate users’ experience. ## Aurora Rainbow Bridge > **[Rainbow Bridge](https://rainbowbridge.app/)** > > Transfer tokens between Ethereum, Aurora & NEAR! Aurora’s light client based “official” bridge. Support for bridging to Harmony is neither available nor announced. Bridging to Harmony using Rainbow Bridge’s mint-burn model would also create Harmony versions of Ethereum assets on Aurora that could deteriorate users’ experience. ## cBridge > **[The Best Crypto & Binance Bridge | cBridge](https://cbridge.celer.network/)** > > cBridge is a multi-chain, cross-layer asset bridge offering instant transfer with the most number of chains, lowest fee and zero trust. cBridge supports trustless bridging between Harmony and Aurora of USDC only at the time of writing this proposal. Accessing the majority of liquidity on cBridge also requires honesty assumption of its State Guardians. ## Allbridge > **[Allbridge is the best cross-chain bridging solution provider.](https://allbridge.io/)** > > Cross-chain Bridge for Tokens ➜ Based on a liquidity pool focused on security and speed ➜ Transfer ERC20, BEP20 and other tokens in a few clicks - Core.allbridge.io Allbridge supports bridging between Harmony and Aurora of its protocol token ABR only at the time of writing this proposal. The bridging process also requires honesty assumption of its external validators. ## Multichain > **[Multichain - Cross-Chain Router Protocol](https://multichain.org/)** > > Multichain is a cross-chain router protocol; an infrustructure for multi-chain ecosystem, envisioned to become the ultimate router for Web 3. Non-custodial+MPC, Non Slippage Swap, Multichain Router Multichain supports bridging between Harmony / Aurora and other chains, but not directly between Harmony and Aurora at the time of writing this proposal. The bridging process also requires honesty assumption of its external validators. # Proposal Ask Further Auromony research and development is anticipated to cover: - A Harmony ZK light client in Solidity - An Aurora ZK light client in Solidity - A ZK bridge MVP between Harmony and Aurora with support of limited assets - A production-ready ZK bridge between Harmony and Aurora with support of more assets As such, a $15k/year stable basic income is requested to take care of initial R&D, welfare and operations costs. This ask will be lined up with the following milestones: 1. launching a feature-complete product on our testnet 2. forming a DAO with 5-out-of-9 multisig with our DAOs 3. launching on our mainnet with audit 4. attracting 1k daily active users (with launch video, full PR promotion) 5. attracting 10k daily active users (with a detailed roadmap, governance process) # Road Map Given the heavy R&D described above, the anticipated completion dates for objectives up to milestone 3 are very preliminary estimations that could likely vary as time progresses. | Objective | Completion Date | Status | | --- | --- | --- | | Testnet Launch | 30 Apr 2022 | Completed | | DAO Initialization | 30 Jun 2022 | Pending | | Harmony ZK light client Testnet Launch | 30 Sep 2022 | Pending | | Aurora ZK Light Client Testnet Launch | 30 Nov 2022 | Pending | | ZK Auromony Testnet Launch | 15 Jan 2023 | Pending | | Beta Testing | 28 Feb 2023 | Pending | | Smart Contract Audit | 30 Apr 2023 | Pending | | Mainnet Launch | 30 Jun 2023 | Pending | # External Links - [Auromony on Mainnet](http://auromony.s3-website-us-east-1.amazonaws.com/) (Frontend error popups, if any, can be safely ignored.) - [Repositories](https://github.com/Auromony) - Contracts - Harmony - [TransactionManager](https://explorer.harmony.one/address/0x777deb0f8304fb6289450afec04b37108cb795d3) - [RouterFactory](https://explorer.harmony.one/address/0xdaffbe6b79b49793348fc9f4d7ff609b1c9d5d13) - [Router (0xA8ac)](https://explorer.harmony.one/address/0xa8acfb237a8701a91aa9ea849b58aaec3fea3d76) - Aurora - [TransactionManager](https://aurorascan.dev/address/0x777deb0F8304fB6289450AfeC04b37108cB795d3) - [RouterFactory](https://aurorascan.dev/address/0xDaFFbe6b79B49793348FC9f4d7fF609b1C9d5d13) - [Router (0xA8ac)](https://aurorascan.dev/address/0xA8acFB237A8701A91AA9EA849b58aaec3Fea3d76) - Transaction Examples - [[Prepare] Aurora → Harmony](https://aurorascan.dev/tx/0xbd780a3c7fdc420897aade37021d00390caff01317f7ea3a01c8bb1b062af353) - [[Fulfill] Aurora → Harmony](https://explorer.harmony.one/tx/0x6f78603acfd22d66222cd53dc416d47fffb24d1fbab72d402c8edf5eb4dacf3c) - [[Prepare] Harmony → Aurora](https://explorer.harmony.one/tx/0x631729b203667e42fc1361c1232a01183d1317462b202726052998eb867ce076) - [[Fulfill] Harmony → Aurora](https://aurorascan.dev/tx/0x5e7f091ccb9e17a594970c5feeba7c6e87ea1e41ebab755f5433e04424cc5243) ## Demonstration Video (Testnet) [![](https://canada1.discourse-cdn.com/flex035/uploads/harmony1/original/2X/7/7315ed0ed6f70f3a7131f3c069fb7f212f1aa003.jpeg "[ZKU] Auromony - Testnet Showcase") ](https://www.youtube.com/watch?v=sVJhroZi2Gg) ---
**Author:** ![socathie](https://yyz1.discourse-cdn.com/flex035/user_avatar/talk.harmony.one/socathie/32/5676_2.png) [@socathie](https://talk.harmony.one/u/socathie)\ **Post date:** [June 11, 2022, 2:47am UTC](https://talk.harmony.one/t/auromony-aurora-harmony-bridge/19844/2 "2022-06-11T02:47:26Z")
From my understanding of the proposal, it seems that the current version of the bridge is not yet ZK. Is that correct? In that case, I don’t think we can approve the proposal until the ZKLC on Harmony is launched. ---
**Author:** ![Globallager](https://yyz1.discourse-cdn.com/flex035/user_avatar/talk.harmony.one/globallager/32/8966_2.png) [@Globallager](https://talk.harmony.one/u/Globallager)\ **Post date:** [June 11, 2022, 8:50am UTC](https://talk.harmony.one/t/auromony-aurora-harmony-bridge/19844/3 "2022-06-11T08:50:57Z")
That’s correct and certainly understandable, as the current version was built partly on the discretion (on graduation only perhaps?) for ZKU c2’s infrastructure track. ---
**Author:** ![socathie](https://yyz1.discourse-cdn.com/flex035/user_avatar/talk.harmony.one/socathie/32/5676_2.png) [@socathie](https://talk.harmony.one/u/socathie)\ **Post date:** [June 11, 2022, 9:32am UTC](https://talk.harmony.one/t/auromony-aurora-harmony-bridge/19844/4 "2022-06-11T09:32:35Z")
It will be nice if you can continue to explore and build a ZK version! ---
**Author:** ![Pioneer](https://yyz1.discourse-cdn.com/flex035/user_avatar/talk.harmony.one/pioneer/32/12763_2.png) [@Pioneer](https://talk.harmony.one/u/Pioneer)\ **Post date:** [June 11, 2022, 6:59pm UTC](https://talk.harmony.one/t/auromony-aurora-harmony-bridge/19844/5 "2022-06-11T18:59:27Z")
Can you explain the differences and benefits of a ZK bridge vs our existing one for us that do not know or understand the tech! ---
**Author:** ![Globallager](https://yyz1.discourse-cdn.com/flex035/user_avatar/talk.harmony.one/globallager/32/8966_2.png) [@Globallager](https://talk.harmony.one/u/Globallager)\ **Post date:** [June 13, 2022, 3:10pm UTC](https://talk.harmony.one/t/auromony-aurora-harmony-bridge/19844/6 "2022-06-13T15:10:30Z")
For a bridge to function, the bridge smart contract on one chain needs to be aware of what is happening on the opposite chain in order to lock/release assets according to withdrawals/deposits on the opposite chain. That information is usually relayed by relayers. The current Horizon bridge smart contract on Ethereum, if I am not mistaken, relies on trusting **whitelisted relayers** to honestly and reliably relay such information from Harmony. It is, I believe, a design choice to avoid the likely impractical gas costs/limitations that come with verifying and accepting information submitted by arbitrary relayers at the smart contract level. Meanwhile, one property that ZK offers is succinct verification (i.e. verification of complex and large computations can stay easy and small). Therefore a properly built ZK bridge would be capable of verifying and accepting information from **arbitrary relayers** at the smart contract level, enhancing the trustlessness and decentralization of the bridging service. ---
**Author:** ![Pioneer](https://yyz1.discourse-cdn.com/flex035/user_avatar/talk.harmony.one/pioneer/32/12763_2.png) [@Pioneer](https://talk.harmony.one/u/Pioneer)\ **Post date:** [June 13, 2022, 3:16pm UTC](https://talk.harmony.one/t/auromony-aurora-harmony-bridge/19844/7 "2022-06-13T15:16:59Z")
Thank you for taking the time to explain that to us! So this is different from what [Multichain - Cross Chain Router Protocol](https://app.multichain.org/#/router) [Synapse Protocol](https://synapseprotocol.com/?inputCurrency=USDC&outputCurrency=USDC&outputChain=1313161554) these offer? I understand that one is a router, but there are already ways to move funds directly from Harmony to Aurora. There is also a grant that has been approved to work on this: > [@Aurora / Near - Partnership between Aurora / Near and Harmony](https://talk.harmony.one/t/partnership-between-aurora-near-and-harmony/15339/9): > > Hi Jack, Thanks for the prompt response. TheBoringDao Bridge is a two-way bridge that allows USDT, USDC, ETH among many other tokens to be crossed between 15 blockchains. They also provide asset-specific bridges (providing access to a specific asset from a foreign chain) The TVL of the bridge is about 5M These are the audit reports: [Code Audit Reports - BoringDAO🌀](https://docs.boringdao.com/others/code-audit-reports) As mentioned in my post, we believe establishing a bridge between both chains will benefit both chains by allowing for: -greater… ---
**Author:** ![Globallager](https://yyz1.discourse-cdn.com/flex035/user_avatar/talk.harmony.one/globallager/32/8966_2.png) [@Globallager](https://talk.harmony.one/u/Globallager)\ **Post date:** [June 13, 2022, 4:07pm UTC](https://talk.harmony.one/t/auromony-aurora-harmony-bridge/19844/8 "2022-06-13T16:07:41Z")
Bridging with Multichain / Synapse relies on their respective set of validators to perform the bridging honestly. (Have not studied TheBoringDao Bridge myself.) Bridging with a proper ZK bridge would work as intended as long as one relayer is relaying honestly. The bridging service would suspend (with no funds at risk) when no one is relaying honestly, and would resume when at least one honest relayer is back up.