Blockchains, Cryptocurrency and Smart Contracts

Assignments and Projects done during the course CS 765 - Introduction to Blockchains, Cryptocurrency and Smart Contracts taught by Prof. Vinay Ribeiro.

Simulation of a Peer to Peer Cryptocurrency Network

Link to Report of Part 1 of Project

Instructions to run the simulator:

Compile the main.cpp file using g++ main.cpp.

./a.out <SimulationTime> <NumberOfNodes> <percentSlowNodes> <lambda for transaction> <lambda for block>

Directory Structure

The directory contains the following files:

• main.cpp : Contains the main blockchain simulator code. Takes in the following arguments:

1. Simulation time (in seconds)
2. Number of nodes in the network
3. Percentage of slow nodes (in % between 0 to 100)
4. Probability with which two arbitrary nodes are neighbours in the network

• functions.h : Contains the utility functions required for the simulation.

• globalvariables.h : Contains the the global variables that are initialised and updated by variaous other functions.

• structures.h : Contains the following user-defined structures: node, block, event, transaction and their constructors.

Simulation Output

1. blockData.txt : Information of the generated blocks
2. BlockChain_*.txt : Blockchain tree for each node, with other details
3. initialCoins.txt : Coins owned by each node at the start of simulation
4. FinalCoins.txt : Coins owned by each node at the end of simulation

Selfish and Stubborn Mining Attacks

Link to Report of Part 2 of Project

Instructions to run the simulator:

Compile the main.cpp file using g++ main.cpp.

./a.out <NumberOfNodes> <SimulationTime> <lambda for transaction> <lambda for block> <zeta> <alpha>

Directory Structure

The directory contains two folders selfish and stubborn. Each directory has the following files:

• main.cpp : Contains the main blockchain simulator code. Takes in the following arguments as stated above.

• functions.h : Contains the utility functions required for the simulation.

• globalvariables.h : Contains the the global variables that are initialised and updated by variaous other functions.

• structures.h : Contains the following user-defined structures: node, block, event, transaction and their constructors.

• mg.sh : A bash script used to make blockchain tree plots.

Simulation Output

1. blockData.txt : Information of the generated blocks
2. BlockChain_*.txt : Blockchain tree for each node, with other details
3. initialCoins.txt : Coins owned by each node at the start of simulation
4. FinalCoins.txt : Coins owned by each node at the end of simulation
5. MPU.txt : Contains the required ratios (MPU, effective alpha, etc.) for analysis

Layer-2 DAPP over Blockchains

Link to Report of Part 3 of Project

1. Run the following command and copy the address to the genesis.json in the alloc section that adds the balance to the geth account.

geth --datadir $HOME/HW3/test-eth1/ --password ./password.txt account new

2. Run the following command to set up the Ethereum node.

sh runEthereumNode.sh

3. execute the run.py file from a different terminal window

python3 run.py