Polygon/Matic Starport

Protocol Development
8

Polygon Starport Call Notes - Call #1 (June 1st, 2021)

Hello! Thanks everyone that participated in today’s call. I took some notes during the call. Please let me know if I misunderstood an explanation or have some info in here that is not accurate. I can make edits with corrections and clarifications. The next call will take place in 2 weeks from today, likely at a slightly earlier time. We will post future call details soon!

  • Wayne (Compound Labs) has made some progress on a Polygon Starport. The development process of the Starport so far has been to run 2 Ganache chains locally, one for Ethereum and one for Polygon. Also run an instance of a Gateway node locally that hooks up to those Ganache instances.
  • Wayne is deploying both a Polygon Starport contract and a CASH contract to the Ganache instance, and attempting to get the Lock operation to work locally.
  • Wayne is working on creating a test to run the operation; the test currently fails. Once this test passes, it will be the first milestone in development of the Polygon starport.
  • There is a forum thread to discuss the progress of the Starport
  • We went over introductions of everyone in the call. Included several members of Compound Labs, Polygon Team, and interested community members.
  • Jared (Compound Labs) took time to cover what a Starport is: Each peer chain to Gateway needs to have a Starport in order to enable collateral to be supplied to Gateway. It is required that assets be locked in the Starport of the peer chain and also an event must be emitted regarding the Lock, so that Gateway can read it, and recognize the account’s new balance. Once the collateral is Locked and the event is processed by Gateway, the user earns interest in CASH and can borrow another asset.
  • Gateway is the v3 of the Compound protocol. The current instance on Ethereum is v2 of the Compound protocol.
  • Jared asked about how block finality works on Polygon.
  • Jaynti (Polygon) says that it works similar to Ethereum, there is a checkpoint every 3 hours. Transactions go onto Ethereum every 3 hours and then they are considered final. Info can be read from the receipt on Ethereum at any time. A checkpoint is when all nodes on Polygon agree, then the data is verified and written to Ethereum.
  • Mihailo (Polygon) asked about other examples of Starports being built (EVM and non-EVM) so they can refer to those when building a Polygon Starport
  • Jared said that Polygon will likely be the first EVM based chain. Flow is being worked on, but it is not close to completion currently. The Polygon Starport might be the first completed besides the Ethereum Starport.
  • Adam (Compound Labs) Asked what code changes must be made to Gateway in order to include a new Gateway Starport.
  • Jared said the runtime (Gateway code) must be modified and voted in through Compound governance (soft-fork). Gateway workers need to be made to fetch the events emitted by the new peer chain. Several enums need to be made in Gateway for the new chain, and then applied through a soft-fork code upgrade. Examples of some of the enums needed on Gateway are the addresses of the Starport and CASH token on the peer chain, and also the first block in which the Starport is recognized.
  • Toni (Compound Labs) Asked what is a good wait time for events on Polygon? For Ethereum, 6 blocks is a good measure. What is a good amount of blocks on Polygon?
  • Jaynti: 128 blocks is a good measure.
  • Max (Compound Labs) asked do we need to wait for the checkpoint to be posted on Ethereum to be considered final?
  • Jaynti said yes, but this depends on how the Starport will work. Many applications are interacting with the chain directly. You can wait a certain number of blocks instead of waiting for the checkpoint. The process for re-orgs will be similar to Ethereum but we will need to do some more research on this implementation specifically before we know the answer.
  • Jay (community) asked: how can the community members help out? (for those that are not a part of Compound Labs or Polygon)
  • Jared: By reviewing the code that we publicly push to GitHub, like Wayne’s branch. This can be reviewed by the community which would be helpful.
  • Mihailo proposed for the group to come up with a roadmap for the project
  • Hamzah (Polygon) We should come up with the roadmap on the forums.
  • Mihailo asked: Are Gateway and Ethereum deployed to production (mainnet)?
  • Jared: No, we are using Ropsten testnet and we are awaiting audits. We should launch the Polygon Starport first on the Polygon testnet before a mainnet hookup.
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