contrywomanbitcoiner on Nostr: Reading the conversations about the ordinals, an idea comes to me with my limited ...

Reading the conversations about the ordinals, an idea comes to me with my limited understanding that I tell you so that you can get me out of my mistake or guide me on how to put it into practice with the resources that Bitcoin offers. I need to make a contract with a friend who lives in another country, just as we don't need bankers, we don't need lawyers either, just that our agreement is registered in a place where it cannot be modified or deleted, which I understand as ordinals are images registered in a Satoshi, could be a document inscribed in a Satoshi. How can we do it?. I also think that doing it through a post on nostr would have the same result, right? Would we both have to make the same post for our agreement to be valid in the sense that we are both signing-publishing the document? Do you have any idea about it? This would seem to me to take the Bitcoin revolution to other spheres