[Spec] No documented way to get the address of a non-active chain

[mahnunchik]

Is your feature request related to a problem? Please describe.

There is no documented way in WalletConnect providers to obtain the address of a non-active chain. As a result, swap services assume that the second chain uses the same address as the currently active one...

This issue affects wallets that use different addresses for different chains.

Example of a confirmed WalletConnect session namespaces:

{
    "eip155": {
        "chains": [
            "eip155:1",
            "eip155:42161",
            "eip155:56"
        ],
        "methods": [
            ...
        ],
        "events": [
           ...
        ],
        "accounts": [
            "eip155:1:0xB6bB59b3aC844e8e4A98A281D57E3E0628bcb471",
            "eip155:42161:0xAd8eDE8697aF92AF31Fe66EDAD9A52A74F74464E",
            "eip155:56:0x9B0d038121EB94CeA52FD08B416056B2824524dd"
        ]
    }
}

As you can see, different chains use different addresses.

Describe the solution you'd like

Document for dApp developers how to get the address of a second (currently inactive) chain.

Additional context

• It all started when I noticed that WalletConnect doesn't switch addresses when switching chains [@walletconnect/ethereum-provider] accounts array is not updated after switching the chain #5706
• This is how the issue appears in the dApp [WalletConnect] Cross-Chain swap to an incorrect address Uniswap/interface#7864

The issue affects all dApps that use any of the WalletConnect providers.

[linear]

CR-669 [Spec] No documented way to get the address of a non-active chain

[ganchoradkov]

hey @mahnunchik, recommended way is to actually parse and check the current session data https://docs.reown.com/advanced/providers/ethereum#session-data
it contains all details about chains/accounts/methods etc that can be used in the current session
In the providers we've tried to abstract manual work/parsing as much as possible but still session data is main source of truth and is available for devs to access and parse

[mahnunchik]

Hi @ganchoradkov, I'm a wallet developer, so I don't have control over how these dApps use the session data.

I can open an issue with each of the popular exchange services that support cross-chain swaps. But the problem is, I can't tell them how they should work with the session data — there is nothing about that in the documentation or specification. Should I include a link to your comment?

As you can see, everything on the wallet side is done according to the spec: an array of accounts with different addresses is being passed.