*We re-post this proposal with a few modification due to a procedure matter. You can find an original proposal here.
Datachain is focusing on interoperability solutions for heterogeneous blockchains which are not only public chains but also enterprise chains like Hyperledger Fabric, Corda and Hyperledger Besu. And our solution is compliant to IBC designed by Cosmos and won a grant from ICF for IBC-solidity, which is IBC implementation in Solidity. Thus we will be able to support to build Cosmos<>Harmony Bridge with our abundant experience.
This project is developing a bridge between Harmony and Tendermint based ledgers using the IBC. This bridge will be deployed on the private testnet for each of them.
As a sample application of the IBC, we will develop token transfer using ICS-20. The token on Harmony is assumed to be HRC-20 which will be handled as ICS-20 on Tendermint based ledgers.
Requests from the Datachain team
・The relayer will be implemented based on the YUI-relayer which is in Golang
・Harmony Light Client will be written in Golang
・We will use end to end test to confirm that token transfer can be done based on CLI without Web Frontend implementation
Proposal ask
$88,000 for 4months
$30,000 : Before developing the Harmony Light Client
$58,000 : After developing the Harmony Light Client
Metrics for success
Developing Harmony Light Client(HLC) as a Cosmos module in Golang for Tendermint based ledgers like Gaiad.
specification outline of HLC
- Use StateProof instead of ReceiptProof
- Regarding verification, Use Shard Committee(validator set) instead of Checkpoint
- By taking the above approach we can avoid using an immature MMR.
Developing Tendermint Light Client on Harmony
*1 We would like Harmony to consider supporting EIP-665
*2 Our schedule is estimated with the *2 condition (Other ways may affect the schedule)
Developing the relayer in Golang
Developing the token transfer sample application which can be executed based on CLI.
Thank you for submitting a proposal to Harmony’s $300M Ecosystem Fund. Allow me to be your representative on behalf of the Grants committee. We are in the process of reviewing your proposal.
If you have more details to add, please do so by replying to this thread. We would also love to have the Harmony community participate to ask questions and provide feedbacks.
@Jacksteroo Thanks for asking. Does Stargate mean by this https://stargate.cosmos.network/? If so, the IBC enabled by Stargate is a bridge for Tendermint based blockchains, which means zone<>zone in the Cosmos ecosystem. What we will be developing is the IBC for heterogenous blockchains, especially Harmony <> Cosmos at this time. This is the big difference. Please let me know, if you have any questions.
@Daiki could you please provide milestones and clearly mark them as completed/in-progress so that we can facilitate partial payments to accommodate the completed work. thanks.
We cannot call it ready yet but this achievement is a stepping stone to the next phase of the project with improvements. This Grant not only includes the ibc sample application, but also includes the Harmony Light Client(HLC). We have proposed the HLC specification to the Harmony team, and have confirmed that it works locally. It is described in Assumption 1 in the Original proposal. Thank you.
Hi @Jacksteroo@ganesha, as @Kogaichi reported a week ago, we got our milestone completed. Please let me know exact review and funding timeline and the process.
We understand current Harmony’s situation, however this unclear situation makes us anxious. Thus we would like to know the timeline that you have in mind first. And if you need our support or info, feel free to let us know, we will make every effort.
We hope a whole funding process will complete soon and look forward to your reply.
GitHub - harmony-one/harmony-cosmos-bridge-demo
and they have met the acceptance criteria set forth at the beginning of the proposal.
you have my consent to release the grant funds and I hope that datachain team can propose a follow-up grant for implementing the next milestones in getting the harmony<>cosmos trustless bridge production ready.
Thanks a lot for your cooperation in such a difficult situation. From now, we would like to discuss our next milestone. One of the candidate would be leveraging LCP led by us to build Ethereum or Cosmos <> Harmony Bridge or re-launch Horizon.
LCP is a proxy light client verification to realize trust-minimized and gas-efficient cross-chain bridge. And it’s currently supporting IBC as messaging layer, so any cross-chain Dapps can be built on it. But I guess you have been considering next milestone regarding bridge matters, especially Ethereum<>Harmony. We’re grateful if you could let us know about it.
yes, the LCP implementation for harmony light client will be very useful to connect not only ethereum and cosmos, but all other chains. i will be supportive of this proposal. could you make a proposal for the same? we can discuss the details in that proposal and community can also chime in with inputs.
Happy to hear that^^ Would using LCP for Horizon to re-launch be one of your option? Of course we will be launching for all of the major chains in near future and this decision is up to community. But I would like to ask you about this as reference.
yes, it is an option that we would consider based on your progress and timeline for resuming the bridge. since, it will be a replicable technology for connecting many chains, this contribution will be very valuable.
to have the Harmony community participate to ask questions and provide feedbacks.
