<![CDATA[The exchange of digital documents remains vulnerable to alteration, forgery, and manipulation due to third-party attacks and the weaknesses of centralized systems. This study aims to implement the Edwards-curve Digital Signature Algorithm (EdDSA), integrated with blockchain technology based on the Proof of Work (PoW) consensus mechanism, to ensure the security, integrity, and authenticity of electronic documents. The novelty of this research lies in the integration of the EdDSA digital signature mechanism with a Proof of Work consensus-based blockchain to create an electronic document verification system. The research method used is experimental, involving the development of a blockchain-based system using the Python programming language and the Flask framework on a local network simulation consisting of 5 nodes. Each document is processed using the SHA-256 hash function to generate a unique digital fingerprint, which is then digitally signed using EdDSA before being validated through a Proof of Work consensus mechanism and stored on the blockchain network. Research results show that the system achieves a 100% success rate in document verification and manipulation detection, with the EdDSA algorithm generating consistent 64-byte signatures, an average signing time of 0.00048 seconds, and a verification time of 0.00108 seconds. An average block size of 863 bytes and a mining time of 1.02 seconds on a 5 node network demonstrate the system’s efficiency and strong performance. Thus, the combination of EdDSA and a Proof of Work-based blockchain has proven capable of forming a secure, transparent, and decentralized electronic document security system that enhances trust in the use of electronic documents.]]>
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