rich1.0LNMarkets (npub1ln…utnnn)https://nostr.ae/npub1lnm0ac8ft8r3jhddchekledgwvqrkwy7wqejjwcxq47gy87te8zs6utnnnnjumphttps://nostr.aeIt uses Partially Signed Bitcoin Transactions (PSBT) under the hood, with one user (the initiator) creating the transaction and passing it around for each participating peer to provide their signature.