I was also wondering if siacoin is LN compatible. Can you speak to that? It looks like there is something similar up, but will I be able to pay for storage with any other LN compatible coin?

I'd have loved to see the value of coins like these that are supposed to provide a specific economic utility have their value essentially determined by it. For instance you could simply mint new bitseconds * mining efficiency each time that someone issues a proof of storage over a given time period. This way the value of bitseconds shouldn't never go above the real price for storage over time.

Obviously you'd need to set the mining efficiency below 1 to encourage people to actually store user files, or else it'd always be more profitable to just store for the mining rewards.