Spurred by an ongoing lawsuit in the U.K., the new emails are the most significant addition to the canon of what we know about Bitcoin's still anonymous creator. 

When asked how Bitcoin might scale in the future, Satoshi theorized the network might have a maximum of 100,000 nodes. 

Here he goes into the calculations assessing the economics of bandwidth costs to nodes (read: miners) in propagating transactions across the network, the economic costs that would incur, and how that could be cost effectively passed on to users. 

He also discusses the implementation of users paying fees, and hints at the potential for the fee necessary for confirmation of your transaction being market driven due to the processing capacity of the network.

All in all, it's interesting napkin math, though nothing out of the ordinary for those who have read Satoshi's full Bitcoin forum posts. 

There Satoshi talked frequently about his vision for how the network might grow larger, and it's notable much of his ideas were not proven to be viable based on subsequent development work.

EMAIL #2: BITCOIN DOESN'T WASTE ENERGY

Though he wouldn't stick around to see the tremendous uptick in Bitcoin mining using stranded resources, it turns out, Satoshi knew the network was greent.

One of the first criticisms to be lobbied at his new creation, Satoshi spent time addressing the idea that Bitcoin mining was wasteful on the forums, most notably saying that not having a currency like Bitcoin would be the bigger waste. 

Here, however, he expands on the idea in more detail, and in a more vivid and descriptive way than we've seen before.