Does IPFS use proof-of-work?

From @JustinDrake on Tue Nov 22 2016 15:59:55 GMT+0000 (UTC)

The IPFS whitepaper (draft 3) states for S/Kademlia:

One scheme includes a proof-of-work crypto puzzle to make generating Sybills expensive.

Generating an IPFS identity is very fast on my computer and I don’t see any code pointing to proof-of-work. Does IPFS use (or plan to use) proof-of-work to fight Sybills?

Copied from original issue:

From @whyrusleeping on Tue Nov 22 2016 17:28:51 GMT+0000 (UTC)

We have thought about it, And if we need to do this to prevent sybills, we will very likely implement it.