Nice project !

How do you intend to map a BOINC cpid to an NXT passphrase securely ?



Would you like each BOINC user to also setup an NXT node or do you plan to offer users to use a node embedded in your web server ?



In order to transact with NXT, BOINC users will need to poses some NXT in order to pay transaction fees so there's not much point to just distribute NXT assets to users based on their BOINC contribution without also distributing at least small amount of NXT.

You can use a funding monitor for this. But of course someone would have to purchase this NXT in the market first to operate the monitor.



With regards to the economic insentive:

What would users gain by holding NXT or NXT assets ?

Can you somehow link the NXT holding to Boinc contribution to develop an internal economy ?



The 'Project Rain' website will provide the ability for you to extract a large XML file that for each user contains fields that include the cryptocurrency addresses/accounts they've provided and their CPID.This means that project rain data will be -very- public, anyone will have the ability to look up CPID:crypto-address as well as distribute assets to your address. It's up to the end users to manage their privacy (separate accounts/addresses for rain than their main accounts & not use your real identity for BOINC).I'll be adding email confirmation to the website so that users cannot register your email to masquerade as you (if you're an existing BOINC user).Each BOINC user who wishes to receive NXT/Ardor will need to run their own wallet/node. I would prefer to minimize the risk/complexity on my part, especially considering I've added more than 30 cryptocurrencies at this point to Project Rain.I didn't know this, that's certainly important information that we'll need to include in the NXT/Ardor 'rain maker' tutorial/instructions.Not sure, the incentive for BOINC users to hold onto 'rained' NXT/Ardor assets is something you'll need to consider prior to 'raining' the asset.Perhaps rather than raining 100% of an asset onto BOINC users with no purpose (which would likely be dumped on a market), one may distribute 'x' % of an NXT/Ardor asset that has an established/planned purpose? Take an ICO for example, an ICO's distribution is based on how much each user was able to invest, where as 'rained' assets will be distributed onto users depending on their available computing resources (important if your asset requires an userbase with significant computing capabilities).Alternatively, if you are able to change the divisibility of tokens to only whole tokens, you could potentially distribute tokens which represent cards or collectibles which could hold value. Perhaps instead of always guaranteeing the issuance of cards/collectibles, higher levels of computation could increase probability of 'finding' a collectible during a scheduled rain?Regarding building an internal economy, you could potentially create a commercial BOINC project (one with customers, a type of work to crunch and workers) and distribute an NXT/Ardor token in waves over a period of several months & accept this token as currency in the BOINC project. Perhaps these tokens being held by users crunching your BOINC project could be used to vote on internal BOINC project decisions/priorities too?Examples of BOINC projects (note: the discussion has frozen, but there's some juicy content none the less): https://steemit.com/gridcoin/@cm-steem/brainstorming-new-boinc-projects-anyone-can-create-a-project-and-reward-their-users-with-gridcoin There's plenty of possibilities with Project Rain, you've just got to think of a good idea