Just because he signs a message it doesn’t prove anything. I could do something bad, claim I was hacked & sign a message from an address owned by me, linked to this account since 2014. What does that prove?
You're right, it doesn't, but lets look at this objectively. Does he have any real reason to so this, and then spam message various people about it? I can't be certain for sure but I'd lean towards his account being compromised in some way as it doesn't really make sense to me why he would do this. Of course I could be wrong but he knew he would make a lot of enemies/lose friends here and also probably compromise the reputation of his account in the process. Take note of nutildah's post above as well about the smiley etc. I think he just got stung here. The question now is who hacked his account because that is some pretty shady stuff over some petty shit.
We need to find out who Side Chain is. He’s the one with the axe to grind, he’s personally attacked & tried to destroy me. If you look at his post history he has a problem with DT members. He’s had attempts at destroying both Lauda & TMAN.
He’s also voiced his concerns about yahoo finding out who his real account is. Who has applied to join yahoo managed campaigns recently who possibly doesn’t speak English as his native tongue (Side Chain doesn’t type like it is any way).