@spiderman, supertestnet's HODLcontracts tool is not really easy to setup, you can try, it will need a LND node, Python and some other dependencies.

I suggest you to try something easier like 🤠 Cowboy Escrow ⭐ at https://4g0r4.github.io/cowboy-escrow/

It will lock the funds in an ad-hoc onchain multisig, and allow to sig with 2-of-3 nostr keys that created it. So both of you only have to input a npub and an onchain bitcoin address.

You can optionally add our npub if you need an escrow so we can intervene in case of dispute.

We will launch soon our service free of charge, so stackers can trade safely in trustless scenarios like this. Your feedback will be really useful.