Blockchain platform for contracts - who knows?

Question

blockchain

Hello.
I just can't find a single platform that could provide an opportunity to secure a kind of contract between me and some other person about something. Let it be just an agreement with a friend that he should give me 1000 rubles in exactly one month.
After all, why is the blockchain platform attractive? What you put in there, you can't erase from there. There are situations in life when you need to quickly agree on something with a person to organize something like a quick contract. Going to a notary for any nonsense is nonsense. Any own platform obviously has no power, because in my platform I am my own needleworker. Third-party services, such as google.doc, allow you to edit files and it is impossible to fix them there.
Here I am.
Has anyone experienced something similar...
PS It's not about legal force, but about the fact that later in the eyes of loved ones to expose a person as a liar. And the legal point is secondary.

Answer 1

any on Prof of Work where there is enough money,
however - in the short term you can write down
rinkeby.io in the test, see