The single asset staking is audited by two companies:
Zokyo: https://www.zokyo.io/ are very reputable with a very good team and they do a lot of testing (automatic and manual)
Omniscia: www.omniscia.io is a new audit company with very high-profile security engineers. We are impressed by their first report and we believe that they will be one of the major players in the blockchain security field.
