%% You should probably cite draft-ietf-sfc-proof-of-transit instead of this I-D.
@techreport{brockners-proof-of-transit-01,
    number =    {draft-brockners-proof-of-transit-01},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-brockners-proof-of-transit/01/},
    author =    {Frank Brockners and Shwetha Bhandari and Sashank Dara and Carlos Pignataro and John Leddy and Stephen Youell},
    title =     {{Proof of Transit}},
    pagetotal = 20,
    year =      2016,
    month =     jul,
    day =       18,
    abstract =  {Several technologies such as traffic engineering, service function chaining, or policy based routing, are used to steer traffic through a specific, user-defined path. This document defines mechanisms to securely prove that traffic transited the defined path. The mechanisms allow to securely verify whether all packets traversed all those nodes of a given path that they are supposed to visit.},
}