Blockchain - Project

Implementation done in C++ as our final project for: Algorithms and Data Structures course.

We used some Bitcoin design principles including SHA256 to hash block information and headers, and mining.

Requirements

• Uses C++(idk what version)
• Hash++ library

And unfortunately, everything is stored in memory and is deleted when program quits. We are not using dynamic allocation.

BlockChain Object

Genesis block is created during initialization.
The blockchain variables are:

int difficulty; // Amount of 0's for the proof-of-work.
int nregs; // Block's ID.
uuid_64 lastblock; // Last Block ID.
Block UncommitedBlock; // Current in-develop Block.
int transactNo; // Amount of transactions on the current Block.

Block Object

uuid_64 id; // Self-explantory
int salt = 0; // Nonce
uint512_t prev; // Previous block ID
Transaction transactions[BLOCK_SIZE]; // Array with transactions.

Transaction Object

uuid_64 recipient; // Self-explantory
uuid_64 sender; // Self-explantory
int64_t momentoftransact; // Unix-Epoch of transaction.
int64_t qty; // Money sent (Cents, Dolars, Crypto-Coins, etc).

Everytime a block is added to the blockchain it will check that the given hash is valid (With a difficulty of 5, the hash must start with 0x00000...).

This repository uses hashing functions from https://github.com/D7EAD/HashPlusPlus.

JSON Library from nlohmann (JSON for Modern C++)

In our Project we use a modern json library that helps us to write, read, merge, convert and a lot of other functions. All credits of this library to: https://github.com/nlohmann/json#design-goals https://json.nlohmann.me/

Authors

Martin P.	Johar B.	Juan Diego P.	Marcelo Z.	Oscar C.
Martin Perez Bonany	Johar Barzola Estrella	Juan Diego Prochazka	Marcelo Zuloeta	Oscar Chu Lao