To set up nostr:npub1mutnyacc9uc4t5mmxvpprwsauj5p2qxq95v4a9j0jxl8wnkfvuyque23vg, you need to create a lightning channel because the wallet is self custidial. Mutiny requires a minimum of 50k sats to be sent & 10k is used to open the channel from you to Mutiny (ie to cover the cost of an on chain transaction). Most new users are probably sending the minimum amount of 50k, and 40k is left