Presentation on types of attacks.

2. Muhammad Awais UW-19-CS-BS-086
Usman Khan UW-19-CS-BS-070
Ramish Ayaz Khan UW-19-CS-BS-026
Group Members:

3. Event Organization
Project title :

4. We use Remix Etherem IDE to built our
solidity project
IDE:

5. A blockchain is a distributed database or
ledger shared among a computer network's
nodes. They are best known for their
crucial role in cryptocurrency systems for
maintaining a secure and decentralized
record of transactions, but they are not
limited to cryptocurrency uses.
Blockchains can be used to make data in
any industry immutable—the term used to
describe the inability to be altered.
Block Chain

6. Event organization on the blockchain! In this
Solidity project, we will be exploring how to use
smart contracts to create a decentralized event
platform that allows for secure and transparent
event organization.
In this project, we will be designing and
implementing a smart contract system that can
handle various aspects of event organization, such
as ticket sales, create new event and transferring
ticket.
In this project there is an organizer and attendee
Organizer cant create new event attendee can buy
tickets and can transfer his/her to some other
attendee
Introduction :

7. Organizer can create new Event by
adding following data:
• Name
• Price
• Date
• Total ticket count
Organizer

8. Attendee can buy ticket by providing
following data:
• ID of an event
• Ticket quantity
Attendee can transfer ticket by:
• ID
• Quantity
• Address
Attendee

9. Implementation

10. Interface

11. Organizer

12. Attendee (Buy Ticket)

13. Attendee (Transfer Ticket)

14. Check Tickets

15. Check Event

16. Code
//SPDX-License-Identifier: Unlicense
pragma solidity >=0.5 <0.9.0;
contract EventContract {
struct Event{
address organizer;
string name;
uint date;
uint price;
uint ticketCount;
uint ticketRemain;
}
mapping (uint=>Event) public events;
mapping (address=>mapping (uint=>uint)) public tickets;
uint public nextId;
function CreateEvent(string memory name, uint date,uint price, uint ticketCount)
external {
require(date>block.timestamp, "Organize event for future date!");
require(ticketCount>0 , "Generate ticket for event");
events[nextId] = Event (msg.sender,name,date,price,ticketCount,ticketCount);
nextId++;
}

17. Code
function BuyTicket(uint id, uint quantity) external payable
{
require(events[id].date!=0,"Events does not exis");
require(events[id].date>block.timestamp,"event has already occur");
Event storage _event = events[id];
require(msg.value==(_event.price*quantity),"Ether is not enough");
require(_event.ticketRemain>=quantity,"Not enough tickets");
_event.ticketRemain-=quantity;
tickets[msg.sender][id]+=quantity;
}

18. Code
function TransferTicket(uint id, uint quantity, address to ) external
{
require(events[id].date!=0,"Events does not exis");
require(events[id].date>block.timestamp,"event has already occur");
require(tickets[msg.sender][id]>=quantity,"Not enough tickets");
tickets[msg.sender][id]-=quantity;
tickets[to][id]+=quantity;
}
}

19. Any Questions:

20. Thanks