Every dApp and the explorer support meta transactions following the EIP-712 to interact with secondary blockchains as Polygon. Meta transactions are sent by the transaction server which is using a third-party to relay them.
Trezor and Smart contract wallets (we don't support on-chain validation for signatures) can't send meta transactions. Moreover, users may want to not depends on a server to interact.
Currently, the dApps and the explorer only support one chain per domain.
Have different subdomains per blockchain like: goerli-market.decentraland.org or goerli.market.decentraland.org
Supports multiple blockchains within the same subdomain/domain by enabling/disabling features.
To make life easier for the users, we have decided to support multiple blockchains by using the same domain/subdomain. Users can switch to different networks and the webapp must respond to the network change event by enabling/disabling features.
The dApps team will make a breaking change in the decentraland-dapps lib to support multiple blockchains in the dApps.
Each dApp will require a manual update to enable/disable features. A common strategy for this will be needed across all the dApps.
The explorer & the SDK should provide a way for the scenes to check the network where the user is connected.