not accurate, it used to be, now you can sign with Nostr using a key signer like Amber, nostr:nprofile1qqst4qyeqenw7zm0fwjsty68h6cnys5jre2xd8ngqpjv5a2j26s78fspzemhxue69uhhyetvv9ujucm0d9hx7uewd9hj75a0pev won't have your private key
Discussion
I don't think that's entirely accurate either. In order for them to accept lightning payments using LNURL (yourname@coinos), they need to take custody of the funds OR use a HODL/zaplocker invoice (like Zeus does). And they don't appear to be doing zaplocker invoices. nostr:npub1h2qfjpnxau9k7ja9qkf50043xfpfy8j5v60xsqryef64y44puwnq28w8ch are you custodial or non-custodial? This is very hard to determine based on your site.