Surveillance System For the Stock Exchange

Yes!  It must certainly incorporate Blockchain Technology but that is not mentioned.  something to research.......
https://www.ft.com/content/2a428156-ab1e-11e6-9cb3-bb8207902122
"SEC approves vast surveillance system for stock marketSystem will monitor trading data passing daily across US equity and options trading"

"The next step is to choose who will build the system. Three bidders;
 Financial Industry Regulatory Authority 

 SunGard Data Systems and 

Thesys Technologies

Singapore:  http://www.bloomberg.com/news/articles/2016-11-16/singapore-working-on-interbank-payments-blockchain-with-r3-dbs

• Banks will deposit cash as collateral in exchange for digital currency issued by the central bank
• Participating banks can pay each other directly with this digital currency instead of first sending payment instructions through MAS
• Banks can later redeem the digital currency for cash