Yes I just found out about this.
ERC659(BEP659) is an universal standard for Bonds.
Any token on the market can issue their bond with Sigma protocol
and ERC659(BSC659) standard.
Bonds can only be traded on Sigma bonds exchange, using SASH as the settlement currency
SO this is an airdrop. And I suggest you sign up to this and also refer 5 people to this to make it active.
https://t.me/Sigma_airdrop_bot?start=r02002133310
I have gotten several thousands of dollars from entering airdrops.
It does not take too much time and it is worth it in the end!