Blockchain

Blockchain is a simplified blockchain simulation tool for bitcoin transactions. Blockchain uses the ArrayList data structure to store one transaction in each block. In this tool, the 40 hex-character hash code is generated using the SHA-1 algorithm.

Getting Started

Clone the repository with:

git clone https://github.com/EricHaggar/Blockchain.git

Change your directory to the project

cd Blockchain

Transactions File

The bitcoinBank text file contains initial transactions and format that needs to be strictly followed. The order within the transaction file needs to be the following:

block index
Long.valueOf(java.sql.Timestamp)
sender
receiver
amount
nonce (proof of work)
hash

The transaction file given can be used or a new one can be created.

Please Note: "bitcoin" needs to be the first sender in the transaction and cannot be used in any other transactions. Also, the hash code for each transaction uses the following format:

timestamp.toString() + ":" + transaction.toString() + "." + nonce + previousHash

Once all desired transactions have been added, an output log file will be generated representing the created blockchain of bitcoin transactions. For instance, if the transaction file is bitcoinBank and the miner ID is Eric, the output file will be bitcoinBank_Eric.txt.

Prerequisites

Make sure you have the Java SE Development Kit 8 or higher. If not install it from:

https://www.oracle.com/technetwork/java/javase/downloads/jdk11-downloads-5066655.html

Running The Simulation

Open a terminal within the directory and compile the all java files using:

javac *.java

Run the tool

java Blockchain

Built With

• ArrayList