Blockchains generally are only about the "deltas" and not the entire blockchain, otherwise it would be impractical right from the get go. Every block only includes the differences. The problem is that these differences get thrown into a database that itself is growing far too large, so you can get by an example the new direction Vitalik from ethereum brings up is to split this out so you almost have subnetworks that are subordinates of the master. Of course, it is still early so we need to get more details. Now my main question is if Propthereum will have a secure database for the assets, and what kind of assets you are willing to manage?
The blockchain technology is going to be used to simplify and allow for investors to participate where they might not be able to otherwise. For example, general crowd funding requires investors to be verified and foreign currency exchange can be tricky to get around when it comes to sending money and investing in companies overseas. We are using Blockchain technology to give investors the opportunity to invest in something with the potential for astronomical gains which otherwise wouldnt be possible without blockchain technology. Once the crowdsale is completed the Property assets will be purchased through fiat currency. With this being said, Propthereum is able to purchase property with promising returns and create value for PTC token holders to increase their gains on a CryptoCurrency exchange