[westurner]

Known Traveler Digital Identity system is a "new model for airport screening and security that uses biometrics, cryptography and distributed ledger technologies."

Blockcerts are for academic credentials, AFAIU.

[EDIT]

Existing blockchains have a limited TPS (transactions per second) for writes; but not for reads. Sharding and layer-2 (sidechains) do not have the same assurances. I'm sure we all remember how cryptokitties congested the txpool during the Bitcoin futures launch.

[brooklyn_ashey]

Thank you. I looked into "clear", one of the airport known traveler ID systems. (I'm assuming there are others) It's pretty cool/concerning. Takes ~ 8 min to load a traveler into its system. Thanks for reminding me of TPS---the info on read vs write.