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 Can I order RTB from overseas? PREMYO BONDS 2 FAQs Can I trade/sell RTBs? How? I’m an Overseas Filipino, how can I use Coins to fund my FirstMetroSec trading account?