Unable to sign evm transactions again (regression)

[randy75828]

It seems like there is a recent removal in the evm field in carbon.json as shown here:

feeaefb

and that the evm info for the chain is moved to:

https://github.com/chainapsis/keplr-chain-registry/blob/main/evm/eip155%3A9790.json

but this brings back this error Not ethermint like and EVM chain due to the missing evmInfo field.

This sudden update is breaking our chains evm transaction. Can anyone help?

[randy75828]

@Thunnini @delivan @claraexmachina

[delivan]

Hey @randy75828 It would be helpful to tell what and where do you try to sign EVM transaction.

[randy75828]

I'm signing on our demex application. It is a feature that is planned for release today but due to the sudden change in the chain config here it is blocked in testing environment.

In short it is blocked because of the evm info removal

@delivan

[randy75828]

I saw that reversion is probably due to the SWTH values not showing corrrectly on the keplr wallet, which probably stems from the fact that probably the wallet cannot differentiate an 8dp SWTH (cosmos) vs 18dp SWTH (evm). However this reversion is causing us to not being able to sign evm transaction

[delivan]

You are right. and another crucial problem is Metamask user's address is derived with 'coin type 60', but Keplr user's address is derived with 'coin type 118'. We don't support both coin typ 60 and 118 as on one chain. so we split Carbon chain config into cosmos version(coin type 118, cosmos/carbon.json) and evm version (coin type 60, evm/eip155:9790.json).

If you want to use evm functionality, you should use Keplr with ethereum json rpc provider via window.keplr.ethereum or MIPD(EIP-6963) like using Metamask in your app. @randy75828

[delivan]

If you want to sign and send a transaction, you can use eth_sendTransaction. it includes signing process.
eth_signTransaction is not supported for now but it will be supported asap. @randy75828

[randy75828]

appreciate the help! it is working now! @delivan

[randy75828]

@delivan i realised there is no way for me to suggest chain unless i hardcode the json i got while added keplr via the official keplr website

https://chains.keplr.app/

{
  "rpc": "https://evm-api.carbon.network",
  "nodeProvider": {
    "name": "Switcheo Labs",
    "email": "info@switcheo.network",
    "website": "https://www.switcheo.com/"
  },
  "chainId": "eip155:9790",
  "chainName": "Carbon EVM",
  "chainSymbolImageUrl": "https://raw.githubusercontent.com/chainapsis/keplr-chain-registry/main/images/eip155:9790/chain.png",
  "bip44": {
    "coinType": 60
  },
  "currencies": [
    {
      "coinDenom": "SWTH",
      "coinMinimalDenom": "swth",
      "coinDecimals": 18,
      "coinGeckoId": "switcheo"
    }
  ],
  "feeCurrencies": [
    {
      "coinDenom": "SWTH",
      "coinMinimalDenom": "swth",
      "coinDecimals": 18,
      "coinGeckoId": "switcheo"
    }
  ],
  "rest": "https://evm-api.carbon.network",
  "evm": {
    "chainId": 9790,
    "rpc": "https://evm-api.carbon.network"
  },
  "features": [
    "eth-address-gen",
    "eth-key-sign"
  ],
  "beta": true
}

is there any api available for me to call?

[delivan]

You can call wallet_addEthereumChain with some params via window.keplr.ethereum.request method.
I refer a document from Metamask which is working same with Keplr @randy75828

[randy75828]

Hmm but in that case I'll need to hardcore the params regardless, based on what is on keplr wallet registry for my Evm chain?

[delivan]

Yes, It would be good to do that and one thing you should change is chainId value as "0xfef" not "eip155:9790"

[randy75828]

thanks

for this, is it possible to suggest Carbon EVM straightaway?
Seems like not quite possible?

[delivan]

There is no way for that connection popup, but after that you can call wallet_switchEthereumChain to switch to your chain to connect.
Refer the document for it

[randy75828]

Thanks

i am getting this error even though the chain has been added and switched, do u know why

[delivan]

@randy75828 Have you connected to your chain? does that error make your logic stuck?