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All Journal Jurnal SPEKTRUM PROSIDING CSGTEIS 2013 JOIV : International Journal on Informatics Visualization JOURNAL OF APPLIED INFORMATICS AND COMPUTING Jurnal Ilmiah Ilmu Sosial Scientific Journal of Informatics
Fajar Purnama
Jurusan Teknik Elektro, Fakultas Teknik, Universitas Udayana
Humanities Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice

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Journal : JOURNAL OF APPLIED INFORMATICS AND COMPUTING

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Prototype of Implementation of Smart Contract for Blockchain-Based Document Storage Pangidoan, Annes Maria; Buana, Putu Wira; Purnama, Fajar
Journal of Applied Informatics and Computing Vol. 9 No. 4 (2025): August 2025
Publisher : Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30871/jaic.v9i4.9493

Abstract

Data, including digital and physical documents, is a valuable asset often vulnerable to forgery, theft, and reliance on centralized servers, which are costly and prone to failure. This study develops a prototype of a decentralized document storage application by combining blockchain and the InterPlanetary File System (IPFS). The system is designed as a web-based decentralized application (DApp), integrating Ethereum smart contracts to immutably record document metadata and access history, while the actual files are stored in IPFS and identified using unique Content Identifiers (CIDs). User interactions are facilitated through MetaMask for authentication and transaction approval. The system is developed using the Waterfall methodology. Functional testing is conducted through unit tests using Ganache as a local Ethereum blockchain, and the smart contract is also deployed to the Sepolia Ethereum testnet. The results show that the system successfully stores documents via IPFS and records metadata and access activities transparently on the blockchain. Access and download tracking features enhance document accountability. This solution provides a secure, efficient, and transparent alternative to centralized document storage and contributes to the advancement of distributed digital archiving systems.
Implementation of Blockchain Smart Contract for Online Concert Ticket Transactions Based on NFTs Lingga Pratyaksa Nugraha, Anak Agung; Emmy Rosiana Dewi , Ni Wayan; Purnama, Fajar
Journal of Applied Informatics and Computing Vol. 9 No. 4 (2025): August 2025
Publisher : Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30871/jaic.v9i4.9598

Abstract

The development of the entertainment industry, especially music concerts, has driven the transformation of ticket sales systems from conventional to digital methods. Although online concert ticket sales offer greater convenience and reach, they still face the risks of fraud, counterfeit tickets, and unfair distribution. This study, Blockchain Smart Contract Implementation for NFT-Based Online Music Concert Ticket Transactions, aims to develop a ticket sales system using blockchain technology by integrating smart contracts and Non-Fungible Tokens (NFTs). The main objectives are to design and implement smart contracts on the Ethereum network, implement ERC-721-based digital tickets, ensure transparency in transaction history, and verify ticket authenticity through unique identifiers. This study adopts the Agile method, with implementation on the Ethereum Sepolia Testnet and testing using the meta mask digital wallet. The results show that the developed system can automatically hold funds through an escrow mechanism until the ticket is downloaded, generate unique and tamper-proof NFT tickets, display transaction details transparently, and facilitate ticket verification effectively. In conclusion, the use of smart contracts and NFTs significantly improves the security, transparency, and trustworthiness of online music concert ticket transactions.
Co-Authors Aditya Widhiatama, Ngakan Putu Aji Prasetya Wibawa Alviana Ratna Malinda Amanda Saraswati, Ni Putu Andika Pranata, I Kadek Anisa Dalilah Dalilah, Anisa Duman Care Khrisne Dwika Prihambodo, Prakoso Emmy Rosiana Dewi , Ni Wayan Gede Manuaba, Ida Bagus Gede Sukadarmika I Gusti Agung Putu Raka Agung, I Gusti Agung Putu I Made Arsa Suyadnya I Made Oka Widyantara I Nyoman Gede Arya Astawa I Wayan Shandyasa Islam, Noorul Jabari, Nida Juliawan Pawana, I Wayan Adi Lingga Pratyaksa Nugraha, Anak Agung Lintin, Yosep Tara Luther Latumakulita Mairi, Vitrail Gloria Maisha Putra, I Gusti Agung Ngurah Malinda, Alviana Ratna Monicha, Windha Ngurah Indra ER Nur Adl, Waliyin Nyoman Putra Sastra Oktapiyansyah, Recky Pangidoan, Annes Maria Paramitha Sekar Putri A.P., Ni Made Putu Wira Buana Recky Oktapiyansyah Saputra, Deva Dimastawan Windha Monicha