%% You should probably cite draft-ietf-sfc-proof-of-transit instead of this I-D.
@techreport{brockners-proof-of-transit-05,
    number =    {draft-brockners-proof-of-transit-05},
    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/05/},
    author =    {Frank Brockners and Shwetha Bhandari and Sashank Dara and Carlos Pignataro and John Leddy and Stephen Youell and David Mozes and Tal Mizrahi},
    title =     {{Proof of Transit}},
    pagetotal = 23,
    year =      2018,
    month =     may,
    day =       7,
    abstract =  {Several technologies such as Traffic Engineering (TE), Service Function Chaining (SFC), and policy based routing are used to steer traffic through a specific, user-defined path. This document defines mechanisms to securely prove that traffic transited said defined path. These mechanisms allow to securely verify whether, within a given path, all packets traversed all the nodes that they are supposed to visit.},
}