Sorry for being unclear.
I was referring to the Unique Discord ID @ the bottom. The proof presented at the moment is good enough to me (Discord ID match / same mutual friends), however if you could provide that in advance in-case he tries to deny those claims that'd be great.
For example -
Discord PM Template - Refer to the bottom of that thread in regards to the Unique Discord ID. Sorry for the confusion/hassle in advance, and if you need anything else you can contact me on Discord for help @ King#7248 (Capital K) - Unique Discord ID (mine) is - 330896552660959233.