biometric
http://www.eetimes.com/document.asp?doc_id=1278303
http://subs.emis.de/LNI/Proceedings/Proceedings212/321.pdf
http://www.arpnjournals.com/jeas/research_papers/rp_2015/jeas_0315_1680.pdf
http://www.drccomputer.com/solutions/biometrics.html
http://systemdesign.altera.com/blockchains-unchained/
http://www.metaswitch.com/the-switch/employing-blockchains-in-consumer-iot-infrastructures