i am jsmbugu from bitcointalk.org and today July 06, 2019
-----BEGIN SIGNATURE-----
bc1qc3h9w6qa3q4pru7umv0m4kz4297ecuakfrlzvq
IE3scZk6tWbWJF7MCzRXWjCqzt6gFYwkjrCwBwdRjeZqRmiXpfA5CX4RHmykwrkdgXI1oJY5PsDoPAG XVEMjHr4=
-----END BITCOIN SIGNED MESSAGE-----
If you want to be able to "prove" that you are still the same owner of this BitcoinTalk account... you should restore your Electrum wallet (either by using your 12 word backup seed mnemonic or by finding the old wallet file if it is still available) and then sign a message from that same bc1qc3h9w6qa3q4pru7umv0m4kz4297ecuakfrlzvq address to be able to prove that you still control it.
Just changing the address in your BitcoinTalk profile means absolutely nothing.
In fact, now it does look like the account has been sold/traded, as the address has changed and you can't sign from the bc1qc3h9w6qa3q4pru7umv0m4kz4297ecuakfrlzvq address to prove otherwise!!