Add Sepolia support for Polygon cross-chain #751
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The Goerli testnet currently used by Threshold/Keep for development purposes is planned to become deprecated with the end of year 2023. The testnet that was created to replace it is called [Holešky](https://github.com/eth-clients/holesky), however it will take some time until it gets integrated with by some of the projects we rely on. As a solution, we decided to switch first to another testnet that is currently live - Sepolia. This testnet's EOL is planned for 2026, which gives us plenty of time to move to Holešky before Sepolia gets deprecated. Until Görli is not dead we want to support both testnets. The Goerli -> Sepolia migration means that also L2 testnet basing on Goerli (Mumbai) needs to be migrated to Sepolia-based chain. At the moment the new testnet isn't yet announced, so deployment of our contract is yet not possible. But we're already starting to add changes that prepare us for the moment when it will be supported. Once new testnet is live and WOrmhole support is confirmed, we'll need to verify if `wormholeChainID` we use in the config is correct for the testnet. We'll also need to update the missing Hardhat configuration (TODOs) and add the `export-artifacts:sepolia` spript to `package.json`.
99 tasks
deployment
It was unclear which testnet will replace the Mumbai testnet after the deprecation of the underlying Goerli testnet. Now we know the new L2 testnet on Polygon will be called `amoy` and will use the `80002` chain id. We can update our config accordingly. Read more: maticnetwork/heimdall#1096 maticnetwork/bor#1072
Adding Sepolia-related contracts needed for deployment on `amoy` network: * `external/baseSepolia/BaseTokenBridge.json` - address taken from https://docs.wormhole.com/wormhole/blockchain-environments/evm#testnet-contracts-base-sepolia-84532 * `external/amoy/SolanaWormholeGateway.json` - used the same value as in `mumbai` * `external/sepolia/TokenBridge.json` - address taken from https://docs.wormhole.com/wormhole/blockchain-environments/evm#testnet-contracts-sepolia-11155111 NOT included in this commit (but needed for the deployment): * `external/amoy/PolygonWormholeTBTC.json` - in order to get the address we need to perform attestation of the Ethereum Sepolia TBTC token on Amoy (but atm Amoy is not available on the list of target networks on https://wormhole-foundation.github.io/example-token-bridge-ui/#/register) * `external/amoy/PolygonTokenBridge.json` - address needs to be taken from https://docs.wormhole.com/wormhole/blockchain-environments/evm once Wormhole adds a support for Amoy
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The Goerli testnet currently used by Threshold/Keep for development purposes is planned to become deprecated with the end of year 2023. The testnet that was created to replace it is called
Holešky, however it will take some time until it gets integrated with by some of the projects we rely on. As a solution, we decided to switch first to another testnet that is currently live - Sepolia. This testnet's EOL is planned for 2026, which gives us plenty of time to move to Holešky before Sepolia gets deprecated. Until Görli is not dead we want to support both testnets.
The Goerli -> Sepolia migration means that also L2 testnet based on Goerli (Mumbai) needs to be migrated to Sepolia-based chain (Amoy). In this PR we're adjusting the config used to deploy testnet contracts in the
@keep-network/tbtc-v2-polygonproject. After the update, both deploy tomumbaiandamoynetworks will be supported (we may removemumbaisupport once we're sure theamoydeployment works as expected).TODO
external/amoy/PolygonWormholeTBTC.json- in order to get the address we need to perform attestation of the Ethereum Sepolia TBTC token on Amoy (but atm Amoy is not available on the list of target networks on https://wormhole-foundation.github.io/example-token-bridge-ui/#/register)external/amoy/PolygonTokenBridge.json- address needs to be taken from https://docs.wormhole.com/wormhole/blockchain-environments/evm once Wormhole adds a support for AmoyRef: threshold-network/solidity-contracts#150