If you owned 20 masternodes, you could send 10-20 transactions a day for free. That's the idea. Without the signature of the masternode, the transactions would be rejected.

I agree then with your idea to block to 1-2 (for now at least, we can improve it if necessary), the amount of MN darksend a day.

No, that part is pretty easy to implement. I've laid out most of the API for this type of thing already. Your idea sounds pretty much the same as mine, you pay once and then you provide proof of that to the nodes as you go. However, mine isn't tied to any transaction, so it's more secure.

Alright Evan, would you mind recap what the proposal is so far?

Also I think a Pay per Darksend process is better than for a period of time, but it's the source of the issue, right?

Are these "free" transactions not traceable though? If you know free transactions come from masternode X then you know owner of masternode X sent this transaction?

Sorry I don't understand this bit..

Yeah, it's the source.

The Proposal:

Hardfork the network to provide completely zero-fee darksend mixing. However, when users start they'll pay a "subscription". When mixing on a masternode, they provide proof they own that subscription and the masternode will allow them to mix. After mixing, only masternodes are capable of transmitting these zero-fee transactions to the network by signing them, and they are restricted to only send 1 a day (some calculation based off the total amount of masternodes).

Subscriptions could come in day/month/yearly forms.

Edit: I've got to run! We'll continue this later

How are these subscriptions acquired?

that's a very good point...but then again, necessity is the mother of invention.

Darksend is the process of anonymisation - denominating your balance and them mixing it with other users.

InstantX is completely unrelated, except that it is also made possible by Masternodes. You will be able to IntantX both anonymised and non-anonymised funds.