The KaleidoKards application manifested out of a recurring request to supply a sample DApp as an accompaniment to the platform experience. The use case is not complicated and we even have a fun animation video built into the app, so for the sake of brevity here’s a quick synopsis. You and your friend Joe have decided to use distributed ledger technology as a way to build out digital card collections and establish nonrepudiation over asset ownership. You each have 100 ether with which you can purchase cards from an online vendor. This act of purchasing is truly an invocation of the smart contract that accompanies the trading application. The card vendor owns the smart contract and, by extension, the ether that is sent to it. Once you’ve purchased cards, you have the ability to propose trades with Joe. Joe might accept or he might not. That’s it.