Decentralized-Simple-Registry (BUBlockchain Hackathon)

1. Problem Statement: People need a public, tamper-proof record for small claims, certifications, or asset provenance that is not tied to a centralized database.

2. Proposed Solution: A contract that allows any user to submit a text record (e.g., a claim, a product serial number, a certification link) along with a unique ID, creating a timestamped, permanent entry.

● Core Smart Contract Logic: ○ A Struct to define the record (e.g., id, owner_address, data_string, timestamp)

○ A Mapping to store the records (e.g., mapping of unique id to the Record struct)

○ A function createRecord(string memory_id, string memory_data) that checks if the ID is already used and then saves the new record.

3. System Architecture

5. Smart Contract Design

Record Struct

struct Record {

string id;

address owner;

string data;

uint256 timestamp;

}

Key Functions:

Function Description

createRecord(id, data) Creates a new record, enforces unique IDs

getRecord(id) Returns stored record fields

recordExists(id) Checks if ID has been used

Event RecordCreated Logs record creation for off-chain use

5. Features Using Blockchain Technology

Immutable storage via EVM mapping(string => Record)

Trustless identity using msg.sender

Auditable creation time using block.timestamp

Event logs enabling scalable off-chain indexing & verification

Permissionless usage — any address can store records

6. How the Project Works (Technical Overview) SDKs / Tools Used

• Solidity 0.8.20

• Hardhat development environment

• Ethers.js for contract interaction

• Chai for contract testing

• Node.js for scripting

• C++17 for off-chain demo mirror

Why blockchain makes this possible:

• Data cannot be modified after creation

• No central party required to trust

• Wallets inherently create identity bindings

• Event logs enable efficient record tracking outside the chain

7. Project Structure Decentralized-Simple-Registry/

contracts/

SimpleRegistry.sol

cpp/

main.cpp

Registry.cpp

Registry.h

scripts/

deploy.js

test/

SimpleRegistry.js

docs/

architecture.md

lifecycle.md

LICENSE

README.md

hardhat.config.js

package.json

package-lock.json