Ok, tnx for the suggestion: - Link to transaction on blockchain: https://blockchain.info/address/1J76jfDhJKPxNzKiQ6sU3xy32Q9kjdTeU (payment was done from several addresses, I'm using the first one 16PogsBAz3uqnmMG65NnnPQq3Jxe6qN5G1 for verification but I can sign all addresses if needed). - Signing this threads URL: