If you don't know how to obtain a BTC #Liquid address, check this out, it's a cool phone wallet you install in your phone..

SideSwap - Settlement infrastructure of the Liquid Network

The most convenient way to hold, send, receive and swap assets on the Liquid Network, a bitcoin sidechain built for securities issuance and trading.

Otherwise check https://help.blockstream.com/hc/en-us/articles/900000630846-How-do-I-get-Liquid-Bitcoin-L-BTC- Or visit their nostr profile.. @Blockstream