Digital and Cyber Forensics
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The asymmetry indicates a latency-limited rather than capacity-limited network, supporting concrete tuning, keying, and off-chain storage recommendations for multi-agency forensic deployments.
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Digital evidence is admissible only when an unbroken, tamper-evident chain of custody can be demonstrated, yet the centralised databases most agencies rely on cannot prove that records were never altered, and earlier blockchain-based alternatives have suffered from low throughput, high write latency, and untested behaviour at larger network sizes. This study developed and empirically evaluated a performance-optimised digital evidence management system built on Hyperledger Fabric v2.5.9. Following a Design Science Research methodology, the study produced a four-layer architecture spanning application, smart-contract, blockchain, and storage layers; a Go-language EvidenceContract chaincode exposing six chain-of-custody operations with a per-evidence keying scheme that eliminates multi-version concurrency-control conflicts; a Raft ordering service tuned from its conservative defaults to a 500-millisecond block timeout and a 100-transaction batch size; and an InterPlanetary File System off-chain storage path anchored on-chain by SHA-256 hashes. Performance was measured with Hyperledger Caliper v0.7.1 at three peer-count configurations (5, 10, and 15 peers) with five replicates each, processing 39,000 transactions in total on a Google Cloud e2-standard-8 virtual machine with zero failed transactions. Welch's t-tests showed that mean write latency rose monotonically and significantly with peer count, from 0.396 s at five peers to 0.524 s at fifteen peers (p < 0.001, |d| = 5.56), while sustained write throughput remained statistically indistinguishable at approximately 96 transactions per second (p = 0.646) and the read path held 200 transactions per second at 0.01 s regardless of scale. The asymmetry indicates a latency-limited rather than capacity-limited network, supporting concrete tuning, keying, and off-chain storage recommendations for multi-agency forensic deployments
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@article{Ismail2026Performance,
title = {Performance Optimisation and Evaluation of a Hyperledger Fabric Blockchain Network for Digital Evidence Management},
author = {Juma Ismail and Isakwisa Tende and Gaudence Stanslaus Tesha},
journal = {East African Journal of Information Technology},
year = {2026},
doi = {10.37284/eajit.9.2.5725},
url = {https://doi.org/10.37284/eajit.9.2.5725}
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