This would allow wallet operations like funding transactions with smart contract-based inputs such as LN, or any input the Core wallet doesn't know how to sign for.

https://github.com/bitcoin/bitcoin/pull/17211#issuecomment-933674310
void UnsetBlankWalletFlag(WalletBatch& batch) override;
    
    const ArgsManager& m_args;
    
    interfaces::Chain* m_chain;
    
    std::string m_name;
    
    std::unique_ptr<WalletDatabase> const m_database;
    /**
     * The following is used to keep track of how far behind the wallet is
     * from the chain sync, and to allow clients to block on us being caught up.
     *
     * Processed hash is a pointer on node's tip and doesn't imply that the wallet
     * has scanned sequentially all blocks up to this one.
     */
    uint256 m_last_block_processed GUARDED_BY(cs_wallet);
    /** Height of last block processed is used by wallet to know depth of transactions
     * without relying on Chain interface beyond asynchronous updates. For safety, we
     * initialize it to -1. Height is a pointer on node's tip and doesn't imply
     * that the wallet has scanned sequentially all blocks up to this one.
     */
    int m_last_block_processed_height GUARDED_BY(cs_wallet) = -1;
    std::map<OutputType, ScriptPubKeyMan*> m_external_spk_managers;
    std::map<OutputType, ScriptPubKeyMan*> m_internal_spk_managers;
    
    
    std::map<uint256, std::unique_ptr<ScriptPubKeyMan>> m_spk_managers;
    /**
     * Catch wallet up to current chain, scanning new blocks, updating the best