[tribler]

Yes, that seems a possible attack. You can store stuff and pass the regular audits using "Proof-Of-Storage", yet refuse to upload bits when finally asked.

Hard to protect systems from irrational attacks like that (we know from building a similar system). They are quite transparant about their "unsolved-problems": https://github.com/filecoin-project/specs/issues/63

[dlubarov]

Why do you call that behavior irrational? Seems like it would save some bandwidth costs, as the parent suggests.

[wmf]

AFAIK nodes get paid for serving data and they can set the price to be higher than their bandwidth costs, so refusing to serve data is refusing to make money.

[beambot]

If you are the only surviving node with the data, then it's called extortion or holding the data hostage.

[wmf]

Preventing that kind of problem is basically the point of Filecoin and similar systems.

[rickycook]

see my reply to the parent; there’s a retrieval market too, which could help that issue