Registering a chain with the Explorer does not impact or improve the ability for wallets and dapps to support your chain.
It is simply a way for users to discover wallets and dapps that support your chain by filtering results programmatically via the Explorer API. It is still up to wallets and dapps to provide concrete support for your chain once it is listed as part of the Explorer.
If you want to add a particular chain, you can do so by creating a GitHub issue.
To register a chain, you must know both its native representation (the chainID used with that kind of blockchain) and its Chain Agnostic Standards Alliance representation, which can be found reading the relevant CAIP-2 profiles on the CASA Namespaces Project Docs.
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