OJS — Open Journal Systems is a open source software to managing and publishing scholarly articles. One of the features is payment processing with modules for Paypal and Manual payment processing. My use case was to integrate a payment gateway called Bluesnap rather than Paypal. …

The basic examples with Hyperledger are excellent but I wanted to model a data structure with optional and repeating elements. Using Chaincode I then wanted to create and read a record. The use case for this type of problem is a common one. In your list of contacts a typical…

When you start your blockchain journey you inevitably run into the question of how to model relationships within your implementation. Blockchain Hyperledger Fabric (Fabric) storage is not based on a relational model, data has a key and then a ‘lump’ of data. Thinks of a very long single table with…

Setup Hyperledger on AWS — May 2021 Back in 2019 the setup for hyperledger was more complex than it is today. Things have now changed, it is easier to setup and more straight forward to get to grips with hyperledger. My test setup is on AWS running a clean installation…

Reading http://truffleframework.com/docs/getting_started/solidity-tests I wanted to setup my own example of testing Ethereum contracts with solidity code. This setup leads on from my earlier article on how to build a and test a contract in Truffle using Javascript https://medium.com/@paulmarriott/a-very-basic-truffle-js-testing-story-6dfb7a504fe8 The docs give an example using an example Metacoin contract. My goal…

Like many getting their feet wet with Ethereum development and testing of Ethereum contracts I went through many late night hours trying to figure out how to get things done. Documentation, online posts and news articles would give some information and in many cases just looking at the issues of…