Since my BTC addresses posted on this site belong to Coinbase and Jaxx Wallets (which don't have signed messages), would I be able to prove that I own the account any other way? For example, making a small payment to an agreed upon BTC address at a certain time?
If the BTC addy wasn't posted prior to this signing, what is the point?
Read the sticky in Meta slowly and let it sink in.
I have posted BTC addresses several times over the past couple years on this forum to wallets that I still have active. I'm just saying those wallets (Coinbase and Jaxx) don't have options to sign messages, however I still control the wallets and can send payment as proof.
The original e-mail address associated with the account (from 2015 - Oct 2017) is also mine. The password was changed on October 20th and it's also obvious that the posts and language used is different all of a sudden.