What you write is onchain. https://bitcoinfiles.org/tx/31ee…

What you write is onchain.
https://bitcoinfiles.org/tx/31eeaa3f569a6fee188d59f4771577737082f83f71e0c48e146f9571fe99e0cb

And the blockchain is public.
And what identify you is your key (the 12 words in your settings).
Another client? retrotwetch.com