What will be my proof of ownership for RTB? February 28, 2020 02:47 Updated You will receive your Confirmation of Sale (COS) via email within 30 days after issue date. Related articles What is a settlement account? What is a Bond Exchange and How can I participate? How much is the broker’s fee for RTBs? Can I sell partial amounts of the RTB? For RTB purchase, I already funded my account but the prompt still says not enough buying power.