Currently there are several pending tasks that needs to be completed (along with estimates) listed below:
EIP-1559 update to ethereum pow verification [3 days] - fzgem18, DONE, Ganesh to review & merge, Feb 14-16COMPLETE
- Cleanup the repo, download DAGs for next few epochs, deploy a testnet version, provide access to others Mar 6 - Mar 14 @Ganesha Upadhyaya
- Limited header storage in smart contracts [2 day], Feb 28-Mar 21 - @TK
- Handling forks & building canonical chain for ethereum light client & TokenLockerOnHarmony to use canonical chain [5 days] Feb 14-Mar 21 - @Ganesha Upadhyaya
- Merging two redundant merkle libraries [3 days] Feb 28-Mar 21 - @TK
- Batch header receive functionality [1 day] Feb 28-Mar 21 - @TK
Smart contract unit test completion [2 weeks] Feb 14-28 - @Rachit Srivastava
- Review required @Ganesha Upadhyaya
- Smart contract testing, Mar 14 - Mar 28 - @Ganesha Upadhyaya @Rachit Srivastava
- CLI & libraries, Feb 14-Mar 14, @Rachit Srivastava
- [Protocol] MMR hardfork PR, addressing comments, getting it merged [3 weeks] @Ganesha Upadhyaya, start: Feb 14 - Mar 21
- PR review & update Mar 21-28
- Testnet hardfork, Mar 28-Apr 4
- Mainnet hardfork, Apr 11-25 (2 weeks heads up for validators)
- Relayer client & frontend completion [3-4 weeks] @Jenya Piskunov, start: Feb 14 - Apr 18
- End-to-end testing [1 week], start Apr 4-Apr 18 (3 weeks), @Ganesha Upadhyaya , @Jenya Piskunov
- Reach out to relay runners, incentives and onboard them, Apr 4 - Apr 18, @Daniel Pagan
- Launch partner reach out & commit, Apr 4 - Apr 18 @Peter Abilla
- Lend/borrow, DEX, game, etc
- Launch PR materials Apr 4 - Apr 18 @Peter Abilla
- Medium post
- External media coverage
Revised launch date: Apr 25-May 2, 2022 (next assessment date: Mar 28, 2022)
Ethereum Bridge: trustless and efficient asset transfers among PoW-PoS chains
We are building a bridge for applications to access assets on Ethereum while enjoying fast transactions on Harmony. Our bridge architecture is industry leading, being gas efficient and seamless between Proof-of-Work and Proof-of-Stake chains. Inspired by Flyclient (already deployed in ZCash), our light client uses Merkle Mountain Range (MMR) and epoch syncing. Later we may employ zero-knowledge proofs such as Plonk to further compress the states of these heterogeneous chains.
Horizon: A Gas-Efficient, Trustless Bridge for Cross-Chain Transactions
With the rise of digital currency systems that rely on blockchain to ensure ledger security, the ability to perform cross-chain transactions is becoming a crucial interoperability requirement. Such transactions allow not only funds to be transferred from one blockchain to another (as done in atomic swaps), but also a blockchain to verify the inclusion of any event on another blockchain.
Horizon: A Gas-Efficient Trustless Bridge for Cross-Chain Transactions
Harmony recently launched Horizon, a bridge for transferring any ERC20 assets between Ethereum and Harmony, powered by a set of trusted validators. Within a couple of weeks after Horizon, Harmony also launched SWOOP, a decentralized exchange (DEX) for swapping assets bridged from Ethereum.
Introducing Horizon: An Ethereum-Harmony Cross-chain Bridge
ho·ri·zon /həˈrīzən/: the line at which the earth's surface and the sky appear to meet. Harmony has launched Horizon , the first version of its Ethereum-Harmony cross-chain bridge, on the mainnet. This is the foundation of many upcoming initiatives designed to bolster a vibrant crosschain ecosystem on Harmony that will allow users and developers to smoothly interact with multiple chains.
Harmony as Interoperable Layer-2 for Ethereum
Harmony as a Layer 2 solution has a comparable (if not better) proposition for Ethereum applications when compared to Optimistic and ZK rollups Optimistic rollups have longer withdrawal wait times and ZK rollups are yet to be generalize to any EVM computations Harmony is fully EVM compatible with Ethereum tooling (Metamask, web3.js/ether.js) Harmony's interoperability solution allows instant settlements and also gas-efficient transactions Ethereum's high gas fee and slowness has led to greater advancement of Layer 2 (L2) technologies.
9/6-9/13: bug fix & localnet testing Done
- Fixed a bug in the MMR proof generation logic related to siblings node computation. Added node index to MMR Proof RPC response and modified GetProof RPC to return MMR proof with respect to an input block number to 3872. The 3872 PR is almost ready for review this week and testnet testing.
9/13-9/30: v1.0.0 [Pre-alpha] functionality completing & unit tests DONE
- Finalize MMR Hardfork PR 3872 and get it reviewed/merged
- Finish HarmonyLightClient & tests
- Migrate to hardhat with upgradability
- Upgradable LightClients and Provers (both Harmony & Ethereum side)
9/27-TBD: v1.0.1 [Pre-Alpha] functionality completing & unit tests In-Progress
- complete unit tests for lightclient, prover and bridge contracts on both sides
- prover: validating header, transaction inclusion, receipt, account, log, code
- lightclient: checkpointing, relayer add/remove, threshold
- bridge: deposit, withdraw, execute
- upgradability: both lightclient & bridge, gnosis-safe ownership
- fix bridge cli & tools - DONE
- gas cost estimation experiments for relayers and users
- begin audit (internal+external)
10/11-TBD: v1.0.2 [Alpha] bridge ecosystem deployment In-Progress
- specs & docs @Ganesha Upadhyaya
- relayer client, dashboard @Jenya Piskunov
- client: includes both eth and hmy rleays, js client with docker build, aws kms for signing key management
- admin dashboard: list all withdraw requests from users, show relay cost, profit, trigger client to relay
- bridge frontend & explorer @Jenya Piskunov
10/11-TBD: v1.0.3 [Alpha] testnet deployment
- deploy eth components on harmony testnet, run kovan testnet relayer, full functionality testing
- deploy hmy components on kovan testnet, run hmy testnet relayer, full functionality testing
10/18-TBD: v1.0.4 [Beta] mainnet deployment
Survey of Crosschain 2021
Survey of Crosschain Methods in 2021 Author: Quoc Le The blockchain industry is heading into a multi-chain economy and cross chains (or bridges) are making inter-chain asset and token transfer possible. In 2018, I started Quanta with cross-chain at the forefront which was used to move assets fro...
Horizon Code Review
Harmony's Horizon Bridge Code Review Reviewer: Quoc Le 1. Coin Unlocks To move asset across the chain, the user must retrieve the proof data from the src and execute the proof function validateAndExecuteProof with src proof on the dest blockchain. // src: src Bridge // dest: dest Bri...