If a wallet is restored from a seed phrase, how does it discover the list of assets, for example ERC-20 and ERC-721 tokens, that the wallet holds? What if these assets are obscure, and aren't supported by services like OpenSea?

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Wallets like Metamask have a list of tokens to check when importing a wallet. All tokens outside of this list won't be shown on the UI, hence the 'Import Tokens' option.

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