The role of oracles in Blockchain In many cases, a transaction’s validity depends on some external piece of data, that all parties need to agree on, such as the current exchange rate. However, if we were to let each participant evaluate the transaction’s validity based on their own view of this external data, the contract’s execution…

“The Kotlin Way” is a series of article where I describe ways to write commonly used code constructs and patterns in Kotlin. This is the first article in the series, where I will show various techniques to implement intefaces from both Java as well as Kotlin libaries using Kotlin styles. Inspiration …

Whilist developing a CorDapp in Corda, I noticed something interesting during my work. In my CorDapp, I have a state, defined in a data class. One of the attributes of this state is a mutableMap. Mutable maps allow you to update its key-value pairs after initialization. So I issued this…

I recently submitted a CorDapp sample to R3 Corda’s community CorDapps ecosystem, which demonstrates upgrading the contracts and states of a CorDapp. In this article, I’m going to walk you through this process, and show how to upgrade states & contracts simultaneously. Lets discuss some key concepts around CorDapp upgrades…