Deal acceptance to commitment timeouts

[whyrusleeping]

If a client makes a deal with a miner, the miner accepts, receives the data, then sends back confirmation of having received the data, the client should have some recourse if the miner does not post a sector commitment containing their data within a given time frame.

Once way of doing this is to consider a miners collateral ‘locked up’ as soon as the deal is signed. Then, if a miner doesnt post their sector commitment in time, the client can slash them for the collateral associated with that sector. This does allow the miner to effectively ‘double spend’ that collateral, making deals with multiple clients without enough collateral to cover them. But in this case, we can impose harsh penalties for miners who overcommit to their collateral. The miner could be slashed entirely.

cc @nicola

[whyrusleeping]

+1 from nicola, This now just needs to be written into the storage deal protocol.