Transaction ID 73b4218bf4ca51fdf690a7468d6b515d27f79e201abfffc02702c458875e9bcd

Memo transaction

Post memo The decision making behind it was pretty simple though. Since there was the threat of attack from dishonest miners, they imeneted some protection. It is an old concept in blockchain.
Reply to memo 6a24193debadd0758aa4e5f519342fc27d17e6401052bde265ee10e5ecaebd2f