A blockchain is a digital ledger of all cryptocurrency transactions. It is constantly growing as “completed” blocks are added to it with a new set of recordings. Each block contains a cryptographic hash of the previous block, a timestamp, and transaction data. Bitcoin nodes use the block chain to differentiate legitimate Bitcoin transactions from attempts to re-spend coins that have already been spent elsewhere.
Setting up a blockchain network for your gym, health or fitness club can be a great way to keep track of memberships, payments and other important data. In this article, we’ll show you how to set up a blockchain network for your business using the Hyperledger Fabric platform.
Hyperledger Fabric is an open source blockchain platform that enables businesses to build blockchain applications. It is a platform for distributed ledger solutions, underpinned by a modular architecture that delivers high degrees of confidentiality, resiliency, flexibility and scalability.
The first thing you’ll need to do is install Hyperledger Fabric on your server. You can find instructions on how to do this here. Once you’ve done that, you’ll need to set up your blockchain network.
Creating a blockchain network with Hyperledger Fabric is simple. First, create a file called “network.json” in the “config” directory of your Fabric installation. This file will contain the configuration for your blockchain network.
In the “network.json” file, add the following:
Next, you’ll need to define your chaincode. Chaincode is the program that runs on a blockchain network and defines the rules of the blockchain. In the “network.json” file, add the following under the “chaincode” section:
Now that you’ve defined your blockchain network and chaincode, you’re ready to start setting up your blockchain applications.
There are many different ways to build blockchain applications on top of Fabric. In this article, we’ll show you how to use the Hyperledger Composer framework to build a simple application for tracking memberships and payments at a gym, health or fitness club.
Hyperledger Composer is a tool for quickly building blockchain applications on top of Fabric. It includes a modeling language for defining the data model of your application, and a set of APIs and libraries for interacting with the blockchain.
First, you’ll need to install Composer. You can find instructions on how to do this here.
Once you’ve installed Composer, you can start building your blockchain application. In this example, we’ll create a simple application for tracking memberships and payments at a gym, health or fitness club.
The first thing you’ll need to do is define your data model. In Composer, data is represented as entities and relationships. An entity is a piece of data that has meaning within your application, such as a member or a payment. A relationship is a link between two entities, such as a membership or a payment.
In this example, we’ll define three entities: Member, Membership and Payment. We’ll also define two relationships: MembershipPayment and MemberPayment.
The Member entity represents a person who is a member of the gym, health or fitness club. The Membership entity represents a membership at the gym, health or fitness club. The Payment entity represents a payment made by a member to the gym, health or fitness club.
The MembershipPayment relationship links a membership to a payment. The MemberPayment relationship links a member to a payment.
The first thing our chaincode will do is define the data model. We’ll use the Composer modeling language to do this.
Next, our chaincode will implement two functions: “createMembership” and “createPayment”. The “createMembership” function will be used to create new memberships. The “createPayment” function will be used to create new payments.
Finally, our chaincode will export a set of APIs so that applications can interact with it. These APIs will allow applications to create new memberships and payments, and query the blockchain for existing data.