Design of a Secure Blockchain-Based Cryptocurrency Wallet with Offline Transaction Capability

Abstract

Blockchain technology has transformed digital financial systems by enabling decentralized and secure transactions. Despite these advancements, cryptocurrency wallets remain a critical point of vulnerability due to their dependence on continuous internet connectivity and exposure to cyber threats. This paper proposes a secure cryptocurrency wallet architecture that incorporates offline transaction signing and robust cryptographic mechanisms to mitigate security risks. The system utilizes public-key cryptography, hashing algorithms, and encryption techniques to ensure confidentiality, integrity, and authentication of transactions. The offline signing mechanism enables secure transaction authorization without exposing private keys to online environments. Furthermore, the proposed system enhances key management through encrypted storage and secure access protocols. The results demonstrate that the proposed architecture significantly reduces attack vectors and improves overall system resilience, making it a reliable solution for secure cryptocurrency transactions.

Introduction

The rise of digital technologies has popularized cryptocurrencies like Bitcoin and Ethereum, which rely on blockchain for secure, decentralized transactions. A cryptocurrency wallet is essential for storing and managing digital assets using cryptographic keys, where the private key authorizes transactions and the public key verifies them. Despite blockchain’s security, online wallets remain vulnerable to phishing, malware, and hacking, risking exposure of private keys and potential financial loss.

To address these issues, the paper proposes a secure blockchain-based wallet with offline transaction capability. Transactions are signed in an isolated offline environment, minimizing private key exposure and enhancing security. The system integrates advanced cryptographic methods—including public-key cryptography, encryption, secure hash functions, and key management—to ensure confidentiality, integrity, and authentication.

The system architecture consists of three layers:

1. User Interface Layer – Allows users to input transaction details.
2. Wallet Processing Layer – Handles key generation, offline transaction signing, and encryption.
3. Blockchain Network Layer – Broadcasts signed transactions, validates them through nodes, applies consensus, and records them in the distributed ledger.

The methodology ensures secure key management, offline signing, transaction verification, and blockchain confirmation, combining usability with robust protection. By incorporating offline signing and strong cryptographic mechanisms, the system provides a safer, efficient, and reliable cryptocurrency wallet, addressing vulnerabilities in conventional online wallets.

Conclusion

This paper presented a secure blockchain-based cryptocurrency wallet system with offline transaction capability. The proposed system enhances the security of digital transactions by protecting private keys and minimizing exposure to online threats. By incorporating advanced cryptographic techniques such as public-key cryptography, encryption, and digital signatures, the system ensures data confidentiality, integrity, and authentication. The introduction of offline transaction signing significantly reduces the risk of cyber-attacks, including phishing and unauthorized access. The proposed architecture provides a reliable and efficient solution for secure cryptocurrency transactions while maintaining usability. Overall, the system improves trust and security in blockchain-based financial systems. Future work can focus on integrating advanced authentication mechanisms such as biometric verification and multi-factor authentication, as well as improving scalability and compatibility with various blockchain platforms.

References

This paper presented a secure blockchain-based cryptocurrency wallet system with offline transaction capability. The proposed system enhances the security of digital transactions by protecting private keys and minimizing exposure to online threats. By incorporating advanced cryptographic techniques such as public-key cryptography, encryption, and digital signatures, the system ensures data confidentiality, integrity, and authentication. The introduction of offline transaction signing significantly reduces the risk of cyber-attacks, including phishing and unauthorized access. The proposed architecture provides a reliable and efficient solution for secure cryptocurrency transactions while maintaining usability. Overall, the system improves trust and security in blockchain-based financial systems. Future work can focus on integrating advanced authentication mechanisms such as biometric verification and multi-factor authentication, as well as improving scalability and compatibility with various blockchain platforms.

Copyright

Copyright © 2026 Shariff Usman, Tiruveedhi K.V.V. Sai Sriram, Thati Mithra. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.